F: drivers/media/v4l2-core/videobuf2-*
F: include/media/videobuf2-*
+VIRTIO AND VHOST VSOCK DRIVER
+M: Stefan Hajnoczi <stefanha@redhat.com>
+L: kvm@vger.kernel.org
+L: virtualization@lists.linux-foundation.org
+L: netdev@vger.kernel.org
+S: Maintained
+F: include/linux/virtio_vsock.h
+F: include/uapi/linux/virtio_vsock.h
+F: net/vmw_vsock/virtio_transport_common.c
+F: net/vmw_vsock/virtio_transport.c
+F: drivers/vhost/vsock.c
+F: drivers/vhost/vsock.h
+
VIRTUAL SERIO DEVICE DRIVER
M: Stephen Chandler Paul <thatslyude@gmail.com>
S: Maintained
obj-$(CONFIG_SSB) += ssb/
obj-$(CONFIG_BCMA) += bcma/
obj-$(CONFIG_VHOST_RING) += vhost/
+obj-$(CONFIG_VHOST) += vhost/
obj-$(CONFIG_VLYNQ) += vlynq/
obj-$(CONFIG_STAGING) += staging/
obj-y += platform/
More information about the Intel MIC family as well as the Linux
OS and tools for MIC to use with this driver are available from
<http://software.intel.com/en-us/mic-developer>.
+
+if VOP
+source "drivers/vhost/Kconfig.vringh"
+endif
The caif driver for CAIF over Virtio.
if CAIF_VIRTIO
-source "drivers/vhost/Kconfig"
+source "drivers/vhost/Kconfig.vringh"
endif
tristate "Host kernel accelerator for virtio net"
depends on NET && EVENTFD && (TUN || !TUN) && (MACVTAP || !MACVTAP)
select VHOST
- select VHOST_RING
---help---
This kernel module can be loaded in host kernel to accelerate
guest networking with virtio_net. Not to be confused with virtio_net
tristate "VHOST_SCSI TCM fabric driver"
depends on TARGET_CORE && EVENTFD && m
select VHOST
- select VHOST_RING
default n
---help---
Say M here to enable the vhost_scsi TCM fabric module
for use with virtio-scsi guests
-config VHOST_RING
- tristate
+config VHOST_VSOCK
+ tristate "vhost virtio-vsock driver"
+ depends on VSOCKETS && EVENTFD
+ select VIRTIO_VSOCKETS_COMMON
+ select VHOST
+ default n
---help---
- This option is selected by any driver which needs to access
- the host side of a virtio ring.
+ This kernel module can be loaded in the host kernel to provide AF_VSOCK
+ sockets for communicating with guests. The guests must have the
+ virtio_transport.ko driver loaded to use the virtio-vsock device.
+
+ To compile this driver as a module, choose M here: the module will be called
+ vhost_vsock.
config VHOST
tristate
--- /dev/null
+config VHOST_RING
+ tristate
+ ---help---
+ This option is selected by any driver which needs to access
+ the host side of a virtio ring.
obj-$(CONFIG_VHOST_SCSI) += vhost_scsi.o
vhost_scsi-y := scsi.o
+obj-$(CONFIG_VHOST_VSOCK) += vhost_vsock.o
+vhost_vsock-y := vsock.o
+
obj-$(CONFIG_VHOST_RING) += vringh.o
+
obj-$(CONFIG_VHOST) += vhost.o
enum {
VHOST_NET_FEATURES = VHOST_FEATURES |
(1ULL << VHOST_NET_F_VIRTIO_NET_HDR) |
- (1ULL << VIRTIO_NET_F_MRG_RXBUF)
+ (1ULL << VIRTIO_NET_F_MRG_RXBUF) |
+ (1ULL << VIRTIO_F_IOMMU_PLATFORM)
};
enum {
{
unsigned long uninitialized_var(endtime);
int r = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov),
- out_num, in_num, NULL, NULL);
+ out_num, in_num, NULL, NULL);
if (r == vq->num && vq->busyloop_timeout) {
preempt_disable();
cpu_relax_lowlatency();
preempt_enable();
r = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov),
- out_num, in_num, NULL, NULL);
+ out_num, in_num, NULL, NULL);
}
return r;
if (!sock)
goto out;
+ if (!vq_iotlb_prefetch(vq))
+ goto out;
+
vhost_disable_notify(&net->dev, vq);
hdr_size = nvq->vhost_hlen;
sock = vq->private_data;
if (!sock)
goto out;
+
+ if (!vq_iotlb_prefetch(vq))
+ goto out;
+
vhost_disable_notify(&net->dev, vq);
vhost_net_disable_vq(net, vq);
struct socket *tx_sock = NULL;
struct socket *rx_sock = NULL;
long err;
- struct vhost_memory *memory;
+ struct vhost_umem *umem;
mutex_lock(&n->dev.mutex);
err = vhost_dev_check_owner(&n->dev);
if (err)
goto done;
- memory = vhost_dev_reset_owner_prepare();
- if (!memory) {
+ umem = vhost_dev_reset_owner_prepare();
+ if (!umem) {
err = -ENOMEM;
goto done;
}
vhost_net_stop(n, &tx_sock, &rx_sock);
vhost_net_flush(n);
- vhost_dev_reset_owner(&n->dev, memory);
+ vhost_dev_reset_owner(&n->dev, umem);
vhost_net_vq_reset(n);
done:
mutex_unlock(&n->dev.mutex);
}
mutex_lock(&n->dev.mutex);
if ((features & (1 << VHOST_F_LOG_ALL)) &&
- !vhost_log_access_ok(&n->dev)) {
- mutex_unlock(&n->dev.mutex);
- return -EFAULT;
+ !vhost_log_access_ok(&n->dev))
+ goto out_unlock;
+
+ if ((features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))) {
+ if (vhost_init_device_iotlb(&n->dev, true))
+ goto out_unlock;
}
+
for (i = 0; i < VHOST_NET_VQ_MAX; ++i) {
mutex_lock(&n->vqs[i].vq.mutex);
n->vqs[i].vq.acked_features = features;
}
mutex_unlock(&n->dev.mutex);
return 0;
+
+out_unlock:
+ mutex_unlock(&n->dev.mutex);
+ return -EFAULT;
}
static long vhost_net_set_owner(struct vhost_net *n)
}
#endif
+static ssize_t vhost_net_chr_read_iter(struct kiocb *iocb, struct iov_iter *to)
+{
+ struct file *file = iocb->ki_filp;
+ struct vhost_net *n = file->private_data;
+ struct vhost_dev *dev = &n->dev;
+ int noblock = file->f_flags & O_NONBLOCK;
+
+ return vhost_chr_read_iter(dev, to, noblock);
+}
+
+static ssize_t vhost_net_chr_write_iter(struct kiocb *iocb,
+ struct iov_iter *from)
+{
+ struct file *file = iocb->ki_filp;
+ struct vhost_net *n = file->private_data;
+ struct vhost_dev *dev = &n->dev;
+
+ return vhost_chr_write_iter(dev, from);
+}
+
+static unsigned int vhost_net_chr_poll(struct file *file, poll_table *wait)
+{
+ struct vhost_net *n = file->private_data;
+ struct vhost_dev *dev = &n->dev;
+
+ return vhost_chr_poll(file, dev, wait);
+}
+
static const struct file_operations vhost_net_fops = {
.owner = THIS_MODULE,
.release = vhost_net_release,
+ .read_iter = vhost_net_chr_read_iter,
+ .write_iter = vhost_net_chr_write_iter,
+ .poll = vhost_net_chr_poll,
.unlocked_ioctl = vhost_net_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = vhost_net_compat_ioctl,
#include <linux/cgroup.h>
#include <linux/module.h>
#include <linux/sort.h>
+#include <linux/interval_tree_generic.h>
#include "vhost.h"
module_param(max_mem_regions, ushort, 0444);
MODULE_PARM_DESC(max_mem_regions,
"Maximum number of memory regions in memory map. (default: 64)");
+static int max_iotlb_entries = 2048;
+module_param(max_iotlb_entries, int, 0444);
+MODULE_PARM_DESC(max_iotlb_entries,
+ "Maximum number of iotlb entries. (default: 2048)");
enum {
VHOST_MEMORY_F_LOG = 0x1,
#define vhost_used_event(vq) ((__virtio16 __user *)&vq->avail->ring[vq->num])
#define vhost_avail_event(vq) ((__virtio16 __user *)&vq->used->ring[vq->num])
+INTERVAL_TREE_DEFINE(struct vhost_umem_node,
+ rb, __u64, __subtree_last,
+ START, LAST, , vhost_umem_interval_tree);
+
#ifdef CONFIG_VHOST_CROSS_ENDIAN_LEGACY
static void vhost_disable_cross_endian(struct vhost_virtqueue *vq)
{
vq->is_le = virtio_legacy_is_little_endian();
}
+struct vhost_flush_struct {
+ struct vhost_work work;
+ struct completion wait_event;
+};
+
+static void vhost_flush_work(struct vhost_work *work)
+{
+ struct vhost_flush_struct *s;
+
+ s = container_of(work, struct vhost_flush_struct, work);
+ complete(&s->wait_event);
+}
+
static void vhost_poll_func(struct file *file, wait_queue_head_t *wqh,
poll_table *pt)
{
void vhost_work_init(struct vhost_work *work, vhost_work_fn_t fn)
{
- INIT_LIST_HEAD(&work->node);
+ clear_bit(VHOST_WORK_QUEUED, &work->flags);
work->fn = fn;
init_waitqueue_head(&work->done);
- work->flushing = 0;
- work->queue_seq = work->done_seq = 0;
}
EXPORT_SYMBOL_GPL(vhost_work_init);
}
EXPORT_SYMBOL_GPL(vhost_poll_stop);
-static bool vhost_work_seq_done(struct vhost_dev *dev, struct vhost_work *work,
- unsigned seq)
-{
- int left;
-
- spin_lock_irq(&dev->work_lock);
- left = seq - work->done_seq;
- spin_unlock_irq(&dev->work_lock);
- return left <= 0;
-}
-
void vhost_work_flush(struct vhost_dev *dev, struct vhost_work *work)
{
- unsigned seq;
- int flushing;
+ struct vhost_flush_struct flush;
- spin_lock_irq(&dev->work_lock);
- seq = work->queue_seq;
- work->flushing++;
- spin_unlock_irq(&dev->work_lock);
- wait_event(work->done, vhost_work_seq_done(dev, work, seq));
- spin_lock_irq(&dev->work_lock);
- flushing = --work->flushing;
- spin_unlock_irq(&dev->work_lock);
- BUG_ON(flushing < 0);
+ if (dev->worker) {
+ init_completion(&flush.wait_event);
+ vhost_work_init(&flush.work, vhost_flush_work);
+
+ vhost_work_queue(dev, &flush.work);
+ wait_for_completion(&flush.wait_event);
+ }
}
EXPORT_SYMBOL_GPL(vhost_work_flush);
void vhost_work_queue(struct vhost_dev *dev, struct vhost_work *work)
{
- unsigned long flags;
+ if (!dev->worker)
+ return;
- spin_lock_irqsave(&dev->work_lock, flags);
- if (list_empty(&work->node)) {
- list_add_tail(&work->node, &dev->work_list);
- work->queue_seq++;
- spin_unlock_irqrestore(&dev->work_lock, flags);
+ if (!test_and_set_bit(VHOST_WORK_QUEUED, &work->flags)) {
+ /* We can only add the work to the list after we're
+ * sure it was not in the list.
+ */
+ smp_mb();
+ llist_add(&work->node, &dev->work_list);
wake_up_process(dev->worker);
- } else {
- spin_unlock_irqrestore(&dev->work_lock, flags);
}
}
EXPORT_SYMBOL_GPL(vhost_work_queue);
/* A lockless hint for busy polling code to exit the loop */
bool vhost_has_work(struct vhost_dev *dev)
{
- return !list_empty(&dev->work_list);
+ return !llist_empty(&dev->work_list);
}
EXPORT_SYMBOL_GPL(vhost_has_work);
vq->call_ctx = NULL;
vq->call = NULL;
vq->log_ctx = NULL;
- vq->memory = NULL;
vhost_reset_is_le(vq);
vhost_disable_cross_endian(vq);
vq->busyloop_timeout = 0;
+ vq->umem = NULL;
+ vq->iotlb = NULL;
}
static int vhost_worker(void *data)
{
struct vhost_dev *dev = data;
- struct vhost_work *work = NULL;
- unsigned uninitialized_var(seq);
+ struct vhost_work *work, *work_next;
+ struct llist_node *node;
mm_segment_t oldfs = get_fs();
set_fs(USER_DS);
/* mb paired w/ kthread_stop */
set_current_state(TASK_INTERRUPTIBLE);
- spin_lock_irq(&dev->work_lock);
- if (work) {
- work->done_seq = seq;
- if (work->flushing)
- wake_up_all(&work->done);
- }
-
if (kthread_should_stop()) {
- spin_unlock_irq(&dev->work_lock);
__set_current_state(TASK_RUNNING);
break;
}
- if (!list_empty(&dev->work_list)) {
- work = list_first_entry(&dev->work_list,
- struct vhost_work, node);
- list_del_init(&work->node);
- seq = work->queue_seq;
- } else
- work = NULL;
- spin_unlock_irq(&dev->work_lock);
- if (work) {
+ node = llist_del_all(&dev->work_list);
+ if (!node)
+ schedule();
+
+ node = llist_reverse_order(node);
+ /* make sure flag is seen after deletion */
+ smp_wmb();
+ llist_for_each_entry_safe(work, work_next, node, node) {
+ clear_bit(VHOST_WORK_QUEUED, &work->flags);
__set_current_state(TASK_RUNNING);
work->fn(work);
if (need_resched())
schedule();
- } else
- schedule();
-
+ }
}
unuse_mm(dev->mm);
set_fs(oldfs);
mutex_init(&dev->mutex);
dev->log_ctx = NULL;
dev->log_file = NULL;
- dev->memory = NULL;
+ dev->umem = NULL;
+ dev->iotlb = NULL;
dev->mm = NULL;
- spin_lock_init(&dev->work_lock);
- INIT_LIST_HEAD(&dev->work_list);
dev->worker = NULL;
+ init_llist_head(&dev->work_list);
+ init_waitqueue_head(&dev->wait);
+ INIT_LIST_HEAD(&dev->read_list);
+ INIT_LIST_HEAD(&dev->pending_list);
+ spin_lock_init(&dev->iotlb_lock);
+
for (i = 0; i < dev->nvqs; ++i) {
vq = dev->vqs[i];
}
EXPORT_SYMBOL_GPL(vhost_dev_set_owner);
-struct vhost_memory *vhost_dev_reset_owner_prepare(void)
+static void *vhost_kvzalloc(unsigned long size)
{
- return kmalloc(offsetof(struct vhost_memory, regions), GFP_KERNEL);
+ void *n = kzalloc(size, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
+
+ if (!n)
+ n = vzalloc(size);
+ return n;
+}
+
+struct vhost_umem *vhost_dev_reset_owner_prepare(void)
+{
+ return vhost_kvzalloc(sizeof(struct vhost_umem));
}
EXPORT_SYMBOL_GPL(vhost_dev_reset_owner_prepare);
/* Caller should have device mutex */
-void vhost_dev_reset_owner(struct vhost_dev *dev, struct vhost_memory *memory)
+void vhost_dev_reset_owner(struct vhost_dev *dev, struct vhost_umem *umem)
{
int i;
vhost_dev_cleanup(dev, true);
/* Restore memory to default empty mapping. */
- memory->nregions = 0;
- dev->memory = memory;
+ INIT_LIST_HEAD(&umem->umem_list);
+ dev->umem = umem;
/* We don't need VQ locks below since vhost_dev_cleanup makes sure
* VQs aren't running.
*/
for (i = 0; i < dev->nvqs; ++i)
- dev->vqs[i]->memory = memory;
+ dev->vqs[i]->umem = umem;
}
EXPORT_SYMBOL_GPL(vhost_dev_reset_owner);
}
EXPORT_SYMBOL_GPL(vhost_dev_stop);
+static void vhost_umem_free(struct vhost_umem *umem,
+ struct vhost_umem_node *node)
+{
+ vhost_umem_interval_tree_remove(node, &umem->umem_tree);
+ list_del(&node->link);
+ kfree(node);
+ umem->numem--;
+}
+
+static void vhost_umem_clean(struct vhost_umem *umem)
+{
+ struct vhost_umem_node *node, *tmp;
+
+ if (!umem)
+ return;
+
+ list_for_each_entry_safe(node, tmp, &umem->umem_list, link)
+ vhost_umem_free(umem, node);
+
+ kvfree(umem);
+}
+
+static void vhost_clear_msg(struct vhost_dev *dev)
+{
+ struct vhost_msg_node *node, *n;
+
+ spin_lock(&dev->iotlb_lock);
+
+ list_for_each_entry_safe(node, n, &dev->read_list, node) {
+ list_del(&node->node);
+ kfree(node);
+ }
+
+ list_for_each_entry_safe(node, n, &dev->pending_list, node) {
+ list_del(&node->node);
+ kfree(node);
+ }
+
+ spin_unlock(&dev->iotlb_lock);
+}
+
/* Caller should have device mutex if and only if locked is set */
void vhost_dev_cleanup(struct vhost_dev *dev, bool locked)
{
fput(dev->log_file);
dev->log_file = NULL;
/* No one will access memory at this point */
- kvfree(dev->memory);
- dev->memory = NULL;
- WARN_ON(!list_empty(&dev->work_list));
+ vhost_umem_clean(dev->umem);
+ dev->umem = NULL;
+ vhost_umem_clean(dev->iotlb);
+ dev->iotlb = NULL;
+ vhost_clear_msg(dev);
+ wake_up_interruptible_poll(&dev->wait, POLLIN | POLLRDNORM);
+ WARN_ON(!llist_empty(&dev->work_list));
if (dev->worker) {
kthread_stop(dev->worker);
dev->worker = NULL;
(sz + VHOST_PAGE_SIZE * 8 - 1) / VHOST_PAGE_SIZE / 8);
}
+static bool vhost_overflow(u64 uaddr, u64 size)
+{
+ /* Make sure 64 bit math will not overflow. */
+ return uaddr > ULONG_MAX || size > ULONG_MAX || uaddr > ULONG_MAX - size;
+}
+
/* Caller should have vq mutex and device mutex. */
-static int vq_memory_access_ok(void __user *log_base, struct vhost_memory *mem,
+static int vq_memory_access_ok(void __user *log_base, struct vhost_umem *umem,
int log_all)
{
- int i;
+ struct vhost_umem_node *node;
- if (!mem)
+ if (!umem)
return 0;
- for (i = 0; i < mem->nregions; ++i) {
- struct vhost_memory_region *m = mem->regions + i;
- unsigned long a = m->userspace_addr;
- if (m->memory_size > ULONG_MAX)
+ list_for_each_entry(node, &umem->umem_list, link) {
+ unsigned long a = node->userspace_addr;
+
+ if (vhost_overflow(node->userspace_addr, node->size))
return 0;
- else if (!access_ok(VERIFY_WRITE, (void __user *)a,
- m->memory_size))
+
+
+ if (!access_ok(VERIFY_WRITE, (void __user *)a,
+ node->size))
return 0;
else if (log_all && !log_access_ok(log_base,
- m->guest_phys_addr,
- m->memory_size))
+ node->start,
+ node->size))
return 0;
}
return 1;
/* Can we switch to this memory table? */
/* Caller should have device mutex but not vq mutex */
-static int memory_access_ok(struct vhost_dev *d, struct vhost_memory *mem,
+static int memory_access_ok(struct vhost_dev *d, struct vhost_umem *umem,
int log_all)
{
int i;
log = log_all || vhost_has_feature(d->vqs[i], VHOST_F_LOG_ALL);
/* If ring is inactive, will check when it's enabled. */
if (d->vqs[i]->private_data)
- ok = vq_memory_access_ok(d->vqs[i]->log_base, mem, log);
+ ok = vq_memory_access_ok(d->vqs[i]->log_base,
+ umem, log);
else
ok = 1;
mutex_unlock(&d->vqs[i]->mutex);
return 1;
}
+static int translate_desc(struct vhost_virtqueue *vq, u64 addr, u32 len,
+ struct iovec iov[], int iov_size, int access);
+
+static int vhost_copy_to_user(struct vhost_virtqueue *vq, void *to,
+ const void *from, unsigned size)
+{
+ int ret;
+
+ if (!vq->iotlb)
+ return __copy_to_user(to, from, size);
+ else {
+ /* This function should be called after iotlb
+ * prefetch, which means we're sure that all vq
+ * could be access through iotlb. So -EAGAIN should
+ * not happen in this case.
+ */
+ /* TODO: more fast path */
+ struct iov_iter t;
+ ret = translate_desc(vq, (u64)(uintptr_t)to, size, vq->iotlb_iov,
+ ARRAY_SIZE(vq->iotlb_iov),
+ VHOST_ACCESS_WO);
+ if (ret < 0)
+ goto out;
+ iov_iter_init(&t, WRITE, vq->iotlb_iov, ret, size);
+ ret = copy_to_iter(from, size, &t);
+ if (ret == size)
+ ret = 0;
+ }
+out:
+ return ret;
+}
+
+static int vhost_copy_from_user(struct vhost_virtqueue *vq, void *to,
+ void *from, unsigned size)
+{
+ int ret;
+
+ if (!vq->iotlb)
+ return __copy_from_user(to, from, size);
+ else {
+ /* This function should be called after iotlb
+ * prefetch, which means we're sure that vq
+ * could be access through iotlb. So -EAGAIN should
+ * not happen in this case.
+ */
+ /* TODO: more fast path */
+ struct iov_iter f;
+ ret = translate_desc(vq, (u64)(uintptr_t)from, size, vq->iotlb_iov,
+ ARRAY_SIZE(vq->iotlb_iov),
+ VHOST_ACCESS_RO);
+ if (ret < 0) {
+ vq_err(vq, "IOTLB translation failure: uaddr "
+ "%p size 0x%llx\n", from,
+ (unsigned long long) size);
+ goto out;
+ }
+ iov_iter_init(&f, READ, vq->iotlb_iov, ret, size);
+ ret = copy_from_iter(to, size, &f);
+ if (ret == size)
+ ret = 0;
+ }
+
+out:
+ return ret;
+}
+
+static void __user *__vhost_get_user(struct vhost_virtqueue *vq,
+ void *addr, unsigned size)
+{
+ int ret;
+
+ /* This function should be called after iotlb
+ * prefetch, which means we're sure that vq
+ * could be access through iotlb. So -EAGAIN should
+ * not happen in this case.
+ */
+ /* TODO: more fast path */
+ ret = translate_desc(vq, (u64)(uintptr_t)addr, size, vq->iotlb_iov,
+ ARRAY_SIZE(vq->iotlb_iov),
+ VHOST_ACCESS_RO);
+ if (ret < 0) {
+ vq_err(vq, "IOTLB translation failure: uaddr "
+ "%p size 0x%llx\n", addr,
+ (unsigned long long) size);
+ return NULL;
+ }
+
+ if (ret != 1 || vq->iotlb_iov[0].iov_len != size) {
+ vq_err(vq, "Non atomic userspace memory access: uaddr "
+ "%p size 0x%llx\n", addr,
+ (unsigned long long) size);
+ return NULL;
+ }
+
+ return vq->iotlb_iov[0].iov_base;
+}
+
+#define vhost_put_user(vq, x, ptr) \
+({ \
+ int ret = -EFAULT; \
+ if (!vq->iotlb) { \
+ ret = __put_user(x, ptr); \
+ } else { \
+ __typeof__(ptr) to = \
+ (__typeof__(ptr)) __vhost_get_user(vq, ptr, sizeof(*ptr)); \
+ if (to != NULL) \
+ ret = __put_user(x, to); \
+ else \
+ ret = -EFAULT; \
+ } \
+ ret; \
+})
+
+#define vhost_get_user(vq, x, ptr) \
+({ \
+ int ret; \
+ if (!vq->iotlb) { \
+ ret = __get_user(x, ptr); \
+ } else { \
+ __typeof__(ptr) from = \
+ (__typeof__(ptr)) __vhost_get_user(vq, ptr, sizeof(*ptr)); \
+ if (from != NULL) \
+ ret = __get_user(x, from); \
+ else \
+ ret = -EFAULT; \
+ } \
+ ret; \
+})
+
+static void vhost_dev_lock_vqs(struct vhost_dev *d)
+{
+ int i = 0;
+ for (i = 0; i < d->nvqs; ++i)
+ mutex_lock(&d->vqs[i]->mutex);
+}
+
+static void vhost_dev_unlock_vqs(struct vhost_dev *d)
+{
+ int i = 0;
+ for (i = 0; i < d->nvqs; ++i)
+ mutex_unlock(&d->vqs[i]->mutex);
+}
+
+static int vhost_new_umem_range(struct vhost_umem *umem,
+ u64 start, u64 size, u64 end,
+ u64 userspace_addr, int perm)
+{
+ struct vhost_umem_node *tmp, *node = kmalloc(sizeof(*node), GFP_ATOMIC);
+
+ if (!node)
+ return -ENOMEM;
+
+ if (umem->numem == max_iotlb_entries) {
+ tmp = list_first_entry(&umem->umem_list, typeof(*tmp), link);
+ vhost_umem_free(umem, tmp);
+ }
+
+ node->start = start;
+ node->size = size;
+ node->last = end;
+ node->userspace_addr = userspace_addr;
+ node->perm = perm;
+ INIT_LIST_HEAD(&node->link);
+ list_add_tail(&node->link, &umem->umem_list);
+ vhost_umem_interval_tree_insert(node, &umem->umem_tree);
+ umem->numem++;
+
+ return 0;
+}
+
+static void vhost_del_umem_range(struct vhost_umem *umem,
+ u64 start, u64 end)
+{
+ struct vhost_umem_node *node;
+
+ while ((node = vhost_umem_interval_tree_iter_first(&umem->umem_tree,
+ start, end)))
+ vhost_umem_free(umem, node);
+}
+
+static void vhost_iotlb_notify_vq(struct vhost_dev *d,
+ struct vhost_iotlb_msg *msg)
+{
+ struct vhost_msg_node *node, *n;
+
+ spin_lock(&d->iotlb_lock);
+
+ list_for_each_entry_safe(node, n, &d->pending_list, node) {
+ struct vhost_iotlb_msg *vq_msg = &node->msg.iotlb;
+ if (msg->iova <= vq_msg->iova &&
+ msg->iova + msg->size - 1 > vq_msg->iova &&
+ vq_msg->type == VHOST_IOTLB_MISS) {
+ vhost_poll_queue(&node->vq->poll);
+ list_del(&node->node);
+ kfree(node);
+ }
+ }
+
+ spin_unlock(&d->iotlb_lock);
+}
+
+static int umem_access_ok(u64 uaddr, u64 size, int access)
+{
+ unsigned long a = uaddr;
+
+ /* Make sure 64 bit math will not overflow. */
+ if (vhost_overflow(uaddr, size))
+ return -EFAULT;
+
+ if ((access & VHOST_ACCESS_RO) &&
+ !access_ok(VERIFY_READ, (void __user *)a, size))
+ return -EFAULT;
+ if ((access & VHOST_ACCESS_WO) &&
+ !access_ok(VERIFY_WRITE, (void __user *)a, size))
+ return -EFAULT;
+ return 0;
+}
+
+int vhost_process_iotlb_msg(struct vhost_dev *dev,
+ struct vhost_iotlb_msg *msg)
+{
+ int ret = 0;
+
+ vhost_dev_lock_vqs(dev);
+ switch (msg->type) {
+ case VHOST_IOTLB_UPDATE:
+ if (!dev->iotlb) {
+ ret = -EFAULT;
+ break;
+ }
+ if (umem_access_ok(msg->uaddr, msg->size, msg->perm)) {
+ ret = -EFAULT;
+ break;
+ }
+ if (vhost_new_umem_range(dev->iotlb, msg->iova, msg->size,
+ msg->iova + msg->size - 1,
+ msg->uaddr, msg->perm)) {
+ ret = -ENOMEM;
+ break;
+ }
+ vhost_iotlb_notify_vq(dev, msg);
+ break;
+ case VHOST_IOTLB_INVALIDATE:
+ vhost_del_umem_range(dev->iotlb, msg->iova,
+ msg->iova + msg->size - 1);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ vhost_dev_unlock_vqs(dev);
+ return ret;
+}
+ssize_t vhost_chr_write_iter(struct vhost_dev *dev,
+ struct iov_iter *from)
+{
+ struct vhost_msg_node node;
+ unsigned size = sizeof(struct vhost_msg);
+ size_t ret;
+ int err;
+
+ if (iov_iter_count(from) < size)
+ return 0;
+ ret = copy_from_iter(&node.msg, size, from);
+ if (ret != size)
+ goto done;
+
+ switch (node.msg.type) {
+ case VHOST_IOTLB_MSG:
+ err = vhost_process_iotlb_msg(dev, &node.msg.iotlb);
+ if (err)
+ ret = err;
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+done:
+ return ret;
+}
+EXPORT_SYMBOL(vhost_chr_write_iter);
+
+unsigned int vhost_chr_poll(struct file *file, struct vhost_dev *dev,
+ poll_table *wait)
+{
+ unsigned int mask = 0;
+
+ poll_wait(file, &dev->wait, wait);
+
+ if (!list_empty(&dev->read_list))
+ mask |= POLLIN | POLLRDNORM;
+
+ return mask;
+}
+EXPORT_SYMBOL(vhost_chr_poll);
+
+ssize_t vhost_chr_read_iter(struct vhost_dev *dev, struct iov_iter *to,
+ int noblock)
+{
+ DEFINE_WAIT(wait);
+ struct vhost_msg_node *node;
+ ssize_t ret = 0;
+ unsigned size = sizeof(struct vhost_msg);
+
+ if (iov_iter_count(to) < size)
+ return 0;
+
+ while (1) {
+ if (!noblock)
+ prepare_to_wait(&dev->wait, &wait,
+ TASK_INTERRUPTIBLE);
+
+ node = vhost_dequeue_msg(dev, &dev->read_list);
+ if (node)
+ break;
+ if (noblock) {
+ ret = -EAGAIN;
+ break;
+ }
+ if (signal_pending(current)) {
+ ret = -ERESTARTSYS;
+ break;
+ }
+ if (!dev->iotlb) {
+ ret = -EBADFD;
+ break;
+ }
+
+ schedule();
+ }
+
+ if (!noblock)
+ finish_wait(&dev->wait, &wait);
+
+ if (node) {
+ ret = copy_to_iter(&node->msg, size, to);
+
+ if (ret != size || node->msg.type != VHOST_IOTLB_MISS) {
+ kfree(node);
+ return ret;
+ }
+
+ vhost_enqueue_msg(dev, &dev->pending_list, node);
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(vhost_chr_read_iter);
+
+static int vhost_iotlb_miss(struct vhost_virtqueue *vq, u64 iova, int access)
+{
+ struct vhost_dev *dev = vq->dev;
+ struct vhost_msg_node *node;
+ struct vhost_iotlb_msg *msg;
+
+ node = vhost_new_msg(vq, VHOST_IOTLB_MISS);
+ if (!node)
+ return -ENOMEM;
+
+ msg = &node->msg.iotlb;
+ msg->type = VHOST_IOTLB_MISS;
+ msg->iova = iova;
+ msg->perm = access;
+
+ vhost_enqueue_msg(dev, &dev->read_list, node);
+
+ return 0;
+}
+
static int vq_access_ok(struct vhost_virtqueue *vq, unsigned int num,
struct vring_desc __user *desc,
struct vring_avail __user *avail,
struct vring_used __user *used)
+
{
size_t s = vhost_has_feature(vq, VIRTIO_RING_F_EVENT_IDX) ? 2 : 0;
+
return access_ok(VERIFY_READ, desc, num * sizeof *desc) &&
access_ok(VERIFY_READ, avail,
sizeof *avail + num * sizeof *avail->ring + s) &&
sizeof *used + num * sizeof *used->ring + s);
}
+static int iotlb_access_ok(struct vhost_virtqueue *vq,
+ int access, u64 addr, u64 len)
+{
+ const struct vhost_umem_node *node;
+ struct vhost_umem *umem = vq->iotlb;
+ u64 s = 0, size;
+
+ while (len > s) {
+ node = vhost_umem_interval_tree_iter_first(&umem->umem_tree,
+ addr,
+ addr + len - 1);
+ if (node == NULL || node->start > addr) {
+ vhost_iotlb_miss(vq, addr, access);
+ return false;
+ } else if (!(node->perm & access)) {
+ /* Report the possible access violation by
+ * request another translation from userspace.
+ */
+ return false;
+ }
+
+ size = node->size - addr + node->start;
+ s += size;
+ addr += size;
+ }
+
+ return true;
+}
+
+int vq_iotlb_prefetch(struct vhost_virtqueue *vq)
+{
+ size_t s = vhost_has_feature(vq, VIRTIO_RING_F_EVENT_IDX) ? 2 : 0;
+ unsigned int num = vq->num;
+
+ if (!vq->iotlb)
+ return 1;
+
+ return iotlb_access_ok(vq, VHOST_ACCESS_RO, (u64)(uintptr_t)vq->desc,
+ num * sizeof *vq->desc) &&
+ iotlb_access_ok(vq, VHOST_ACCESS_RO, (u64)(uintptr_t)vq->avail,
+ sizeof *vq->avail +
+ num * sizeof *vq->avail->ring + s) &&
+ iotlb_access_ok(vq, VHOST_ACCESS_WO, (u64)(uintptr_t)vq->used,
+ sizeof *vq->used +
+ num * sizeof *vq->used->ring + s);
+}
+EXPORT_SYMBOL_GPL(vq_iotlb_prefetch);
+
/* Can we log writes? */
/* Caller should have device mutex but not vq mutex */
int vhost_log_access_ok(struct vhost_dev *dev)
{
- return memory_access_ok(dev, dev->memory, 1);
+ return memory_access_ok(dev, dev->umem, 1);
}
EXPORT_SYMBOL_GPL(vhost_log_access_ok);
{
size_t s = vhost_has_feature(vq, VIRTIO_RING_F_EVENT_IDX) ? 2 : 0;
- return vq_memory_access_ok(log_base, vq->memory,
+ return vq_memory_access_ok(log_base, vq->umem,
vhost_has_feature(vq, VHOST_F_LOG_ALL)) &&
(!vq->log_used || log_access_ok(log_base, vq->log_addr,
sizeof *vq->used +
/* Caller should have vq mutex and device mutex */
int vhost_vq_access_ok(struct vhost_virtqueue *vq)
{
+ if (vq->iotlb) {
+ /* When device IOTLB was used, the access validation
+ * will be validated during prefetching.
+ */
+ return 1;
+ }
return vq_access_ok(vq, vq->num, vq->desc, vq->avail, vq->used) &&
vq_log_access_ok(vq, vq->log_base);
}
EXPORT_SYMBOL_GPL(vhost_vq_access_ok);
-static int vhost_memory_reg_sort_cmp(const void *p1, const void *p2)
+static struct vhost_umem *vhost_umem_alloc(void)
{
- const struct vhost_memory_region *r1 = p1, *r2 = p2;
- if (r1->guest_phys_addr < r2->guest_phys_addr)
- return 1;
- if (r1->guest_phys_addr > r2->guest_phys_addr)
- return -1;
- return 0;
-}
+ struct vhost_umem *umem = vhost_kvzalloc(sizeof(*umem));
-static void *vhost_kvzalloc(unsigned long size)
-{
- void *n = kzalloc(size, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
+ if (!umem)
+ return NULL;
- if (!n)
- n = vzalloc(size);
- return n;
+ umem->umem_tree = RB_ROOT;
+ umem->numem = 0;
+ INIT_LIST_HEAD(&umem->umem_list);
+
+ return umem;
}
static long vhost_set_memory(struct vhost_dev *d, struct vhost_memory __user *m)
{
- struct vhost_memory mem, *newmem, *oldmem;
+ struct vhost_memory mem, *newmem;
+ struct vhost_memory_region *region;
+ struct vhost_umem *newumem, *oldumem;
unsigned long size = offsetof(struct vhost_memory, regions);
int i;
kvfree(newmem);
return -EFAULT;
}
- sort(newmem->regions, newmem->nregions, sizeof(*newmem->regions),
- vhost_memory_reg_sort_cmp, NULL);
- if (!memory_access_ok(d, newmem, 0)) {
+ newumem = vhost_umem_alloc();
+ if (!newumem) {
kvfree(newmem);
- return -EFAULT;
+ return -ENOMEM;
}
- oldmem = d->memory;
- d->memory = newmem;
+
+ for (region = newmem->regions;
+ region < newmem->regions + mem.nregions;
+ region++) {
+ if (vhost_new_umem_range(newumem,
+ region->guest_phys_addr,
+ region->memory_size,
+ region->guest_phys_addr +
+ region->memory_size - 1,
+ region->userspace_addr,
+ VHOST_ACCESS_RW))
+ goto err;
+ }
+
+ if (!memory_access_ok(d, newumem, 0))
+ goto err;
+
+ oldumem = d->umem;
+ d->umem = newumem;
/* All memory accesses are done under some VQ mutex. */
for (i = 0; i < d->nvqs; ++i) {
mutex_lock(&d->vqs[i]->mutex);
- d->vqs[i]->memory = newmem;
+ d->vqs[i]->umem = newumem;
mutex_unlock(&d->vqs[i]->mutex);
}
- kvfree(oldmem);
+
+ kvfree(newmem);
+ vhost_umem_clean(oldumem);
return 0;
+
+err:
+ vhost_umem_clean(newumem);
+ kvfree(newmem);
+ return -EFAULT;
}
long vhost_vring_ioctl(struct vhost_dev *d, int ioctl, void __user *argp)
}
EXPORT_SYMBOL_GPL(vhost_vring_ioctl);
+int vhost_init_device_iotlb(struct vhost_dev *d, bool enabled)
+{
+ struct vhost_umem *niotlb, *oiotlb;
+ int i;
+
+ niotlb = vhost_umem_alloc();
+ if (!niotlb)
+ return -ENOMEM;
+
+ oiotlb = d->iotlb;
+ d->iotlb = niotlb;
+
+ for (i = 0; i < d->nvqs; ++i) {
+ mutex_lock(&d->vqs[i]->mutex);
+ d->vqs[i]->iotlb = niotlb;
+ mutex_unlock(&d->vqs[i]->mutex);
+ }
+
+ vhost_umem_clean(oiotlb);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(vhost_init_device_iotlb);
+
/* Caller must have device mutex */
long vhost_dev_ioctl(struct vhost_dev *d, unsigned int ioctl, void __user *argp)
{
}
EXPORT_SYMBOL_GPL(vhost_dev_ioctl);
-static const struct vhost_memory_region *find_region(struct vhost_memory *mem,
- __u64 addr, __u32 len)
-{
- const struct vhost_memory_region *reg;
- int start = 0, end = mem->nregions;
-
- while (start < end) {
- int slot = start + (end - start) / 2;
- reg = mem->regions + slot;
- if (addr >= reg->guest_phys_addr)
- end = slot;
- else
- start = slot + 1;
- }
-
- reg = mem->regions + start;
- if (addr >= reg->guest_phys_addr &&
- reg->guest_phys_addr + reg->memory_size > addr)
- return reg;
- return NULL;
-}
-
/* TODO: This is really inefficient. We need something like get_user()
* (instruction directly accesses the data, with an exception table entry
* returning -EFAULT). See Documentation/x86/exception-tables.txt.
static int vhost_update_used_flags(struct vhost_virtqueue *vq)
{
void __user *used;
- if (__put_user(cpu_to_vhost16(vq, vq->used_flags), &vq->used->flags) < 0)
+ if (vhost_put_user(vq, cpu_to_vhost16(vq, vq->used_flags),
+ &vq->used->flags) < 0)
return -EFAULT;
if (unlikely(vq->log_used)) {
/* Make sure the flag is seen before log. */
static int vhost_update_avail_event(struct vhost_virtqueue *vq, u16 avail_event)
{
- if (__put_user(cpu_to_vhost16(vq, vq->avail_idx), vhost_avail_event(vq)))
+ if (vhost_put_user(vq, cpu_to_vhost16(vq, vq->avail_idx),
+ vhost_avail_event(vq)))
return -EFAULT;
if (unlikely(vq->log_used)) {
void __user *used;
if (r)
goto err;
vq->signalled_used_valid = false;
- if (!access_ok(VERIFY_READ, &vq->used->idx, sizeof vq->used->idx)) {
+ if (!vq->iotlb &&
+ !access_ok(VERIFY_READ, &vq->used->idx, sizeof vq->used->idx)) {
r = -EFAULT;
goto err;
}
- r = __get_user(last_used_idx, &vq->used->idx);
- if (r)
+ r = vhost_get_user(vq, last_used_idx, &vq->used->idx);
+ if (r) {
+ vq_err(vq, "Can't access used idx at %p\n",
+ &vq->used->idx);
goto err;
+ }
vq->last_used_idx = vhost16_to_cpu(vq, last_used_idx);
return 0;
+
err:
vq->is_le = is_le;
return r;
EXPORT_SYMBOL_GPL(vhost_vq_init_access);
static int translate_desc(struct vhost_virtqueue *vq, u64 addr, u32 len,
- struct iovec iov[], int iov_size)
+ struct iovec iov[], int iov_size, int access)
{
- const struct vhost_memory_region *reg;
- struct vhost_memory *mem;
+ const struct vhost_umem_node *node;
+ struct vhost_dev *dev = vq->dev;
+ struct vhost_umem *umem = dev->iotlb ? dev->iotlb : dev->umem;
struct iovec *_iov;
u64 s = 0;
int ret = 0;
- mem = vq->memory;
while ((u64)len > s) {
u64 size;
if (unlikely(ret >= iov_size)) {
ret = -ENOBUFS;
break;
}
- reg = find_region(mem, addr, len);
- if (unlikely(!reg)) {
- ret = -EFAULT;
+
+ node = vhost_umem_interval_tree_iter_first(&umem->umem_tree,
+ addr, addr + len - 1);
+ if (node == NULL || node->start > addr) {
+ if (umem != dev->iotlb) {
+ ret = -EFAULT;
+ break;
+ }
+ ret = -EAGAIN;
+ break;
+ } else if (!(node->perm & access)) {
+ ret = -EPERM;
break;
}
+
_iov = iov + ret;
- size = reg->memory_size - addr + reg->guest_phys_addr;
+ size = node->size - addr + node->start;
_iov->iov_len = min((u64)len - s, size);
_iov->iov_base = (void __user *)(unsigned long)
- (reg->userspace_addr + addr - reg->guest_phys_addr);
+ (node->userspace_addr + addr - node->start);
s += size;
addr += size;
++ret;
}
+ if (ret == -EAGAIN)
+ vhost_iotlb_miss(vq, addr, access);
return ret;
}
unsigned int i = 0, count, found = 0;
u32 len = vhost32_to_cpu(vq, indirect->len);
struct iov_iter from;
- int ret;
+ int ret, access;
/* Sanity check */
if (unlikely(len % sizeof desc)) {
}
ret = translate_desc(vq, vhost64_to_cpu(vq, indirect->addr), len, vq->indirect,
- UIO_MAXIOV);
+ UIO_MAXIOV, VHOST_ACCESS_RO);
if (unlikely(ret < 0)) {
- vq_err(vq, "Translation failure %d in indirect.\n", ret);
+ if (ret != -EAGAIN)
+ vq_err(vq, "Translation failure %d in indirect.\n", ret);
return ret;
}
iov_iter_init(&from, READ, vq->indirect, ret, len);
return -EINVAL;
}
+ if (desc.flags & cpu_to_vhost16(vq, VRING_DESC_F_WRITE))
+ access = VHOST_ACCESS_WO;
+ else
+ access = VHOST_ACCESS_RO;
+
ret = translate_desc(vq, vhost64_to_cpu(vq, desc.addr),
vhost32_to_cpu(vq, desc.len), iov + iov_count,
- iov_size - iov_count);
+ iov_size - iov_count, access);
if (unlikely(ret < 0)) {
- vq_err(vq, "Translation failure %d indirect idx %d\n",
- ret, i);
+ if (ret != -EAGAIN)
+ vq_err(vq, "Translation failure %d indirect idx %d\n",
+ ret, i);
return ret;
}
/* If this is an input descriptor, increment that count. */
- if (desc.flags & cpu_to_vhost16(vq, VRING_DESC_F_WRITE)) {
+ if (access == VHOST_ACCESS_WO) {
*in_num += ret;
if (unlikely(log)) {
log[*log_num].addr = vhost64_to_cpu(vq, desc.addr);
u16 last_avail_idx;
__virtio16 avail_idx;
__virtio16 ring_head;
- int ret;
+ int ret, access;
/* Check it isn't doing very strange things with descriptor numbers. */
last_avail_idx = vq->last_avail_idx;
- if (unlikely(__get_user(avail_idx, &vq->avail->idx))) {
+ if (unlikely(vhost_get_user(vq, avail_idx, &vq->avail->idx))) {
vq_err(vq, "Failed to access avail idx at %p\n",
&vq->avail->idx);
return -EFAULT;
/* Grab the next descriptor number they're advertising, and increment
* the index we've seen. */
- if (unlikely(__get_user(ring_head,
- &vq->avail->ring[last_avail_idx & (vq->num - 1)]))) {
+ if (unlikely(vhost_get_user(vq, ring_head,
+ &vq->avail->ring[last_avail_idx & (vq->num - 1)]))) {
vq_err(vq, "Failed to read head: idx %d address %p\n",
last_avail_idx,
&vq->avail->ring[last_avail_idx % vq->num]);
i, vq->num, head);
return -EINVAL;
}
- ret = __copy_from_user(&desc, vq->desc + i, sizeof desc);
+ ret = vhost_copy_from_user(vq, &desc, vq->desc + i,
+ sizeof desc);
if (unlikely(ret)) {
vq_err(vq, "Failed to get descriptor: idx %d addr %p\n",
i, vq->desc + i);
out_num, in_num,
log, log_num, &desc);
if (unlikely(ret < 0)) {
- vq_err(vq, "Failure detected "
- "in indirect descriptor at idx %d\n", i);
+ if (ret != -EAGAIN)
+ vq_err(vq, "Failure detected "
+ "in indirect descriptor at idx %d\n", i);
return ret;
}
continue;
}
+ if (desc.flags & cpu_to_vhost16(vq, VRING_DESC_F_WRITE))
+ access = VHOST_ACCESS_WO;
+ else
+ access = VHOST_ACCESS_RO;
ret = translate_desc(vq, vhost64_to_cpu(vq, desc.addr),
vhost32_to_cpu(vq, desc.len), iov + iov_count,
- iov_size - iov_count);
+ iov_size - iov_count, access);
if (unlikely(ret < 0)) {
- vq_err(vq, "Translation failure %d descriptor idx %d\n",
- ret, i);
+ if (ret != -EAGAIN)
+ vq_err(vq, "Translation failure %d descriptor idx %d\n",
+ ret, i);
return ret;
}
- if (desc.flags & cpu_to_vhost16(vq, VRING_DESC_F_WRITE)) {
+ if (access == VHOST_ACCESS_WO) {
/* If this is an input descriptor,
* increment that count. */
*in_num += ret;
start = vq->last_used_idx & (vq->num - 1);
used = vq->used->ring + start;
if (count == 1) {
- if (__put_user(heads[0].id, &used->id)) {
+ if (vhost_put_user(vq, heads[0].id, &used->id)) {
vq_err(vq, "Failed to write used id");
return -EFAULT;
}
- if (__put_user(heads[0].len, &used->len)) {
+ if (vhost_put_user(vq, heads[0].len, &used->len)) {
vq_err(vq, "Failed to write used len");
return -EFAULT;
}
- } else if (__copy_to_user(used, heads, count * sizeof *used)) {
+ } else if (vhost_copy_to_user(vq, used, heads, count * sizeof *used)) {
vq_err(vq, "Failed to write used");
return -EFAULT;
}
/* Make sure buffer is written before we update index. */
smp_wmb();
- if (__put_user(cpu_to_vhost16(vq, vq->last_used_idx), &vq->used->idx)) {
+ if (vhost_put_user(vq, cpu_to_vhost16(vq, vq->last_used_idx),
+ &vq->used->idx)) {
vq_err(vq, "Failed to increment used idx");
return -EFAULT;
}
if (!vhost_has_feature(vq, VIRTIO_RING_F_EVENT_IDX)) {
__virtio16 flags;
- if (__get_user(flags, &vq->avail->flags)) {
+ if (vhost_get_user(vq, flags, &vq->avail->flags)) {
vq_err(vq, "Failed to get flags");
return true;
}
if (unlikely(!v))
return true;
- if (__get_user(event, vhost_used_event(vq))) {
+ if (vhost_get_user(vq, event, vhost_used_event(vq))) {
vq_err(vq, "Failed to get used event idx");
return true;
}
__virtio16 avail_idx;
int r;
- r = __get_user(avail_idx, &vq->avail->idx);
+ r = vhost_get_user(vq, avail_idx, &vq->avail->idx);
if (r)
return false;
/* They could have slipped one in as we were doing that: make
* sure it's written, then check again. */
smp_mb();
- r = __get_user(avail_idx, &vq->avail->idx);
+ r = vhost_get_user(vq, avail_idx, &vq->avail->idx);
if (r) {
vq_err(vq, "Failed to check avail idx at %p: %d\n",
&vq->avail->idx, r);
}
EXPORT_SYMBOL_GPL(vhost_disable_notify);
+/* Create a new message. */
+struct vhost_msg_node *vhost_new_msg(struct vhost_virtqueue *vq, int type)
+{
+ struct vhost_msg_node *node = kmalloc(sizeof *node, GFP_KERNEL);
+ if (!node)
+ return NULL;
+ node->vq = vq;
+ node->msg.type = type;
+ return node;
+}
+EXPORT_SYMBOL_GPL(vhost_new_msg);
+
+void vhost_enqueue_msg(struct vhost_dev *dev, struct list_head *head,
+ struct vhost_msg_node *node)
+{
+ spin_lock(&dev->iotlb_lock);
+ list_add_tail(&node->node, head);
+ spin_unlock(&dev->iotlb_lock);
+
+ wake_up_interruptible_poll(&dev->wait, POLLIN | POLLRDNORM);
+}
+EXPORT_SYMBOL_GPL(vhost_enqueue_msg);
+
+struct vhost_msg_node *vhost_dequeue_msg(struct vhost_dev *dev,
+ struct list_head *head)
+{
+ struct vhost_msg_node *node = NULL;
+
+ spin_lock(&dev->iotlb_lock);
+ if (!list_empty(head)) {
+ node = list_first_entry(head, struct vhost_msg_node,
+ node);
+ list_del(&node->node);
+ }
+ spin_unlock(&dev->iotlb_lock);
+
+ return node;
+}
+EXPORT_SYMBOL_GPL(vhost_dequeue_msg);
+
+
static int __init vhost_init(void)
{
return 0;
struct vhost_work;
typedef void (*vhost_work_fn_t)(struct vhost_work *work);
+#define VHOST_WORK_QUEUED 1
struct vhost_work {
- struct list_head node;
+ struct llist_node node;
vhost_work_fn_t fn;
wait_queue_head_t done;
int flushing;
unsigned queue_seq;
unsigned done_seq;
+ unsigned long flags;
};
/* Poll a file (eventfd or socket) */
u64 len;
};
+#define START(node) ((node)->start)
+#define LAST(node) ((node)->last)
+
+struct vhost_umem_node {
+ struct rb_node rb;
+ struct list_head link;
+ __u64 start;
+ __u64 last;
+ __u64 size;
+ __u64 userspace_addr;
+ __u32 perm;
+ __u32 flags_padding;
+ __u64 __subtree_last;
+};
+
+struct vhost_umem {
+ struct rb_root umem_tree;
+ struct list_head umem_list;
+ int numem;
+};
+
/* The virtqueue structure describes a queue attached to a device. */
struct vhost_virtqueue {
struct vhost_dev *dev;
u64 log_addr;
struct iovec iov[UIO_MAXIOV];
+ struct iovec iotlb_iov[64];
struct iovec *indirect;
struct vring_used_elem *heads;
/* Protected by virtqueue mutex. */
- struct vhost_memory *memory;
+ struct vhost_umem *umem;
+ struct vhost_umem *iotlb;
void *private_data;
u64 acked_features;
/* Log write descriptors */
u32 busyloop_timeout;
};
+struct vhost_msg_node {
+ struct vhost_msg msg;
+ struct vhost_virtqueue *vq;
+ struct list_head node;
+};
+
struct vhost_dev {
- struct vhost_memory *memory;
struct mm_struct *mm;
struct mutex mutex;
struct vhost_virtqueue **vqs;
int nvqs;
struct file *log_file;
struct eventfd_ctx *log_ctx;
- spinlock_t work_lock;
- struct list_head work_list;
+ struct llist_head work_list;
struct task_struct *worker;
+ struct vhost_umem *umem;
+ struct vhost_umem *iotlb;
+ spinlock_t iotlb_lock;
+ struct list_head read_list;
+ struct list_head pending_list;
+ wait_queue_head_t wait;
};
void vhost_dev_init(struct vhost_dev *, struct vhost_virtqueue **vqs, int nvqs);
long vhost_dev_set_owner(struct vhost_dev *dev);
bool vhost_dev_has_owner(struct vhost_dev *dev);
long vhost_dev_check_owner(struct vhost_dev *);
-struct vhost_memory *vhost_dev_reset_owner_prepare(void);
-void vhost_dev_reset_owner(struct vhost_dev *, struct vhost_memory *);
+struct vhost_umem *vhost_dev_reset_owner_prepare(void);
+void vhost_dev_reset_owner(struct vhost_dev *, struct vhost_umem *);
void vhost_dev_cleanup(struct vhost_dev *, bool locked);
void vhost_dev_stop(struct vhost_dev *);
long vhost_dev_ioctl(struct vhost_dev *, unsigned int ioctl, void __user *argp);
int vhost_log_write(struct vhost_virtqueue *vq, struct vhost_log *log,
unsigned int log_num, u64 len);
+int vq_iotlb_prefetch(struct vhost_virtqueue *vq);
+
+struct vhost_msg_node *vhost_new_msg(struct vhost_virtqueue *vq, int type);
+void vhost_enqueue_msg(struct vhost_dev *dev,
+ struct list_head *head,
+ struct vhost_msg_node *node);
+struct vhost_msg_node *vhost_dequeue_msg(struct vhost_dev *dev,
+ struct list_head *head);
+unsigned int vhost_chr_poll(struct file *file, struct vhost_dev *dev,
+ poll_table *wait);
+ssize_t vhost_chr_read_iter(struct vhost_dev *dev, struct iov_iter *to,
+ int noblock);
+ssize_t vhost_chr_write_iter(struct vhost_dev *dev,
+ struct iov_iter *from);
+int vhost_init_device_iotlb(struct vhost_dev *d, bool enabled);
#define vq_err(vq, fmt, ...) do { \
pr_debug(pr_fmt(fmt), ##__VA_ARGS__); \
--- /dev/null
+/*
+ * vhost transport for vsock
+ *
+ * Copyright (C) 2013-2015 Red Hat, Inc.
+ * Author: Asias He <asias@redhat.com>
+ * Stefan Hajnoczi <stefanha@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.
+ */
+#include <linux/miscdevice.h>
+#include <linux/atomic.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/vmalloc.h>
+#include <net/sock.h>
+#include <linux/virtio_vsock.h>
+#include <linux/vhost.h>
+
+#include <net/af_vsock.h>
+#include "vhost.h"
+
+#define VHOST_VSOCK_DEFAULT_HOST_CID 2
+
+enum {
+ VHOST_VSOCK_FEATURES = VHOST_FEATURES,
+};
+
+/* Used to track all the vhost_vsock instances on the system. */
+static DEFINE_SPINLOCK(vhost_vsock_lock);
+static LIST_HEAD(vhost_vsock_list);
+
+struct vhost_vsock {
+ struct vhost_dev dev;
+ struct vhost_virtqueue vqs[2];
+
+ /* Link to global vhost_vsock_list, protected by vhost_vsock_lock */
+ struct list_head list;
+
+ struct vhost_work send_pkt_work;
+ spinlock_t send_pkt_list_lock;
+ struct list_head send_pkt_list; /* host->guest pending packets */
+
+ atomic_t queued_replies;
+
+ u32 guest_cid;
+};
+
+static u32 vhost_transport_get_local_cid(void)
+{
+ return VHOST_VSOCK_DEFAULT_HOST_CID;
+}
+
+static struct vhost_vsock *vhost_vsock_get(u32 guest_cid)
+{
+ struct vhost_vsock *vsock;
+
+ spin_lock_bh(&vhost_vsock_lock);
+ list_for_each_entry(vsock, &vhost_vsock_list, list) {
+ u32 other_cid = vsock->guest_cid;
+
+ /* Skip instances that have no CID yet */
+ if (other_cid == 0)
+ continue;
+
+ if (other_cid == guest_cid) {
+ spin_unlock_bh(&vhost_vsock_lock);
+ return vsock;
+ }
+ }
+ spin_unlock_bh(&vhost_vsock_lock);
+
+ return NULL;
+}
+
+static void
+vhost_transport_do_send_pkt(struct vhost_vsock *vsock,
+ struct vhost_virtqueue *vq)
+{
+ struct vhost_virtqueue *tx_vq = &vsock->vqs[VSOCK_VQ_TX];
+ bool added = false;
+ bool restart_tx = false;
+
+ mutex_lock(&vq->mutex);
+
+ if (!vq->private_data)
+ goto out;
+
+ /* Avoid further vmexits, we're already processing the virtqueue */
+ vhost_disable_notify(&vsock->dev, vq);
+
+ for (;;) {
+ struct virtio_vsock_pkt *pkt;
+ struct iov_iter iov_iter;
+ unsigned out, in;
+ size_t nbytes;
+ size_t len;
+ int head;
+
+ spin_lock_bh(&vsock->send_pkt_list_lock);
+ if (list_empty(&vsock->send_pkt_list)) {
+ spin_unlock_bh(&vsock->send_pkt_list_lock);
+ vhost_enable_notify(&vsock->dev, vq);
+ break;
+ }
+
+ pkt = list_first_entry(&vsock->send_pkt_list,
+ struct virtio_vsock_pkt, list);
+ list_del_init(&pkt->list);
+ spin_unlock_bh(&vsock->send_pkt_list_lock);
+
+ head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov),
+ &out, &in, NULL, NULL);
+ if (head < 0) {
+ spin_lock_bh(&vsock->send_pkt_list_lock);
+ list_add(&pkt->list, &vsock->send_pkt_list);
+ spin_unlock_bh(&vsock->send_pkt_list_lock);
+ break;
+ }
+
+ if (head == vq->num) {
+ spin_lock_bh(&vsock->send_pkt_list_lock);
+ list_add(&pkt->list, &vsock->send_pkt_list);
+ spin_unlock_bh(&vsock->send_pkt_list_lock);
+
+ /* We cannot finish yet if more buffers snuck in while
+ * re-enabling notify.
+ */
+ if (unlikely(vhost_enable_notify(&vsock->dev, vq))) {
+ vhost_disable_notify(&vsock->dev, vq);
+ continue;
+ }
+ break;
+ }
+
+ if (out) {
+ virtio_transport_free_pkt(pkt);
+ vq_err(vq, "Expected 0 output buffers, got %u\n", out);
+ break;
+ }
+
+ len = iov_length(&vq->iov[out], in);
+ iov_iter_init(&iov_iter, READ, &vq->iov[out], in, len);
+
+ nbytes = copy_to_iter(&pkt->hdr, sizeof(pkt->hdr), &iov_iter);
+ if (nbytes != sizeof(pkt->hdr)) {
+ virtio_transport_free_pkt(pkt);
+ vq_err(vq, "Faulted on copying pkt hdr\n");
+ break;
+ }
+
+ nbytes = copy_to_iter(pkt->buf, pkt->len, &iov_iter);
+ if (nbytes != pkt->len) {
+ virtio_transport_free_pkt(pkt);
+ vq_err(vq, "Faulted on copying pkt buf\n");
+ break;
+ }
+
+ vhost_add_used(vq, head, sizeof(pkt->hdr) + pkt->len);
+ added = true;
+
+ if (pkt->reply) {
+ int val;
+
+ val = atomic_dec_return(&vsock->queued_replies);
+
+ /* Do we have resources to resume tx processing? */
+ if (val + 1 == tx_vq->num)
+ restart_tx = true;
+ }
+
+ virtio_transport_free_pkt(pkt);
+ }
+ if (added)
+ vhost_signal(&vsock->dev, vq);
+
+out:
+ mutex_unlock(&vq->mutex);
+
+ if (restart_tx)
+ vhost_poll_queue(&tx_vq->poll);
+}
+
+static void vhost_transport_send_pkt_work(struct vhost_work *work)
+{
+ struct vhost_virtqueue *vq;
+ struct vhost_vsock *vsock;
+
+ vsock = container_of(work, struct vhost_vsock, send_pkt_work);
+ vq = &vsock->vqs[VSOCK_VQ_RX];
+
+ vhost_transport_do_send_pkt(vsock, vq);
+}
+
+static int
+vhost_transport_send_pkt(struct virtio_vsock_pkt *pkt)
+{
+ struct vhost_vsock *vsock;
+ struct vhost_virtqueue *vq;
+ int len = pkt->len;
+
+ /* Find the vhost_vsock according to guest context id */
+ vsock = vhost_vsock_get(le64_to_cpu(pkt->hdr.dst_cid));
+ if (!vsock) {
+ virtio_transport_free_pkt(pkt);
+ return -ENODEV;
+ }
+
+ vq = &vsock->vqs[VSOCK_VQ_RX];
+
+ if (pkt->reply)
+ atomic_inc(&vsock->queued_replies);
+
+ spin_lock_bh(&vsock->send_pkt_list_lock);
+ list_add_tail(&pkt->list, &vsock->send_pkt_list);
+ spin_unlock_bh(&vsock->send_pkt_list_lock);
+
+ vhost_work_queue(&vsock->dev, &vsock->send_pkt_work);
+ return len;
+}
+
+static struct virtio_vsock_pkt *
+vhost_vsock_alloc_pkt(struct vhost_virtqueue *vq,
+ unsigned int out, unsigned int in)
+{
+ struct virtio_vsock_pkt *pkt;
+ struct iov_iter iov_iter;
+ size_t nbytes;
+ size_t len;
+
+ if (in != 0) {
+ vq_err(vq, "Expected 0 input buffers, got %u\n", in);
+ return NULL;
+ }
+
+ pkt = kzalloc(sizeof(*pkt), GFP_KERNEL);
+ if (!pkt)
+ return NULL;
+
+ len = iov_length(vq->iov, out);
+ iov_iter_init(&iov_iter, WRITE, vq->iov, out, len);
+
+ nbytes = copy_from_iter(&pkt->hdr, sizeof(pkt->hdr), &iov_iter);
+ if (nbytes != sizeof(pkt->hdr)) {
+ vq_err(vq, "Expected %zu bytes for pkt->hdr, got %zu bytes\n",
+ sizeof(pkt->hdr), nbytes);
+ kfree(pkt);
+ return NULL;
+ }
+
+ if (le16_to_cpu(pkt->hdr.type) == VIRTIO_VSOCK_TYPE_STREAM)
+ pkt->len = le32_to_cpu(pkt->hdr.len);
+
+ /* No payload */
+ if (!pkt->len)
+ return pkt;
+
+ /* The pkt is too big */
+ if (pkt->len > VIRTIO_VSOCK_MAX_PKT_BUF_SIZE) {
+ kfree(pkt);
+ return NULL;
+ }
+
+ pkt->buf = kmalloc(pkt->len, GFP_KERNEL);
+ if (!pkt->buf) {
+ kfree(pkt);
+ return NULL;
+ }
+
+ nbytes = copy_from_iter(pkt->buf, pkt->len, &iov_iter);
+ if (nbytes != pkt->len) {
+ vq_err(vq, "Expected %u byte payload, got %zu bytes\n",
+ pkt->len, nbytes);
+ virtio_transport_free_pkt(pkt);
+ return NULL;
+ }
+
+ return pkt;
+}
+
+/* Is there space left for replies to rx packets? */
+static bool vhost_vsock_more_replies(struct vhost_vsock *vsock)
+{
+ struct vhost_virtqueue *vq = &vsock->vqs[VSOCK_VQ_TX];
+ int val;
+
+ smp_rmb(); /* paired with atomic_inc() and atomic_dec_return() */
+ val = atomic_read(&vsock->queued_replies);
+
+ return val < vq->num;
+}
+
+static void vhost_vsock_handle_tx_kick(struct vhost_work *work)
+{
+ struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
+ poll.work);
+ struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock,
+ dev);
+ struct virtio_vsock_pkt *pkt;
+ int head;
+ unsigned int out, in;
+ bool added = false;
+
+ mutex_lock(&vq->mutex);
+
+ if (!vq->private_data)
+ goto out;
+
+ vhost_disable_notify(&vsock->dev, vq);
+ for (;;) {
+ if (!vhost_vsock_more_replies(vsock)) {
+ /* Stop tx until the device processes already
+ * pending replies. Leave tx virtqueue
+ * callbacks disabled.
+ */
+ goto no_more_replies;
+ }
+
+ head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov),
+ &out, &in, NULL, NULL);
+ if (head < 0)
+ break;
+
+ if (head == vq->num) {
+ if (unlikely(vhost_enable_notify(&vsock->dev, vq))) {
+ vhost_disable_notify(&vsock->dev, vq);
+ continue;
+ }
+ break;
+ }
+
+ pkt = vhost_vsock_alloc_pkt(vq, out, in);
+ if (!pkt) {
+ vq_err(vq, "Faulted on pkt\n");
+ continue;
+ }
+
+ /* Only accept correctly addressed packets */
+ if (le64_to_cpu(pkt->hdr.src_cid) == vsock->guest_cid)
+ virtio_transport_recv_pkt(pkt);
+ else
+ virtio_transport_free_pkt(pkt);
+
+ vhost_add_used(vq, head, sizeof(pkt->hdr) + pkt->len);
+ added = true;
+ }
+
+no_more_replies:
+ if (added)
+ vhost_signal(&vsock->dev, vq);
+
+out:
+ mutex_unlock(&vq->mutex);
+}
+
+static void vhost_vsock_handle_rx_kick(struct vhost_work *work)
+{
+ struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
+ poll.work);
+ struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock,
+ dev);
+
+ vhost_transport_do_send_pkt(vsock, vq);
+}
+
+static int vhost_vsock_start(struct vhost_vsock *vsock)
+{
+ size_t i;
+ int ret;
+
+ mutex_lock(&vsock->dev.mutex);
+
+ ret = vhost_dev_check_owner(&vsock->dev);
+ if (ret)
+ goto err;
+
+ for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) {
+ struct vhost_virtqueue *vq = &vsock->vqs[i];
+
+ mutex_lock(&vq->mutex);
+
+ if (!vhost_vq_access_ok(vq)) {
+ ret = -EFAULT;
+ mutex_unlock(&vq->mutex);
+ goto err_vq;
+ }
+
+ if (!vq->private_data) {
+ vq->private_data = vsock;
+ vhost_vq_init_access(vq);
+ }
+
+ mutex_unlock(&vq->mutex);
+ }
+
+ mutex_unlock(&vsock->dev.mutex);
+ return 0;
+
+err_vq:
+ for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) {
+ struct vhost_virtqueue *vq = &vsock->vqs[i];
+
+ mutex_lock(&vq->mutex);
+ vq->private_data = NULL;
+ mutex_unlock(&vq->mutex);
+ }
+err:
+ mutex_unlock(&vsock->dev.mutex);
+ return ret;
+}
+
+static int vhost_vsock_stop(struct vhost_vsock *vsock)
+{
+ size_t i;
+ int ret;
+
+ mutex_lock(&vsock->dev.mutex);
+
+ ret = vhost_dev_check_owner(&vsock->dev);
+ if (ret)
+ goto err;
+
+ for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) {
+ struct vhost_virtqueue *vq = &vsock->vqs[i];
+
+ mutex_lock(&vq->mutex);
+ vq->private_data = NULL;
+ mutex_unlock(&vq->mutex);
+ }
+
+err:
+ mutex_unlock(&vsock->dev.mutex);
+ return ret;
+}
+
+static void vhost_vsock_free(struct vhost_vsock *vsock)
+{
+ kvfree(vsock);
+}
+
+static int vhost_vsock_dev_open(struct inode *inode, struct file *file)
+{
+ struct vhost_virtqueue **vqs;
+ struct vhost_vsock *vsock;
+ int ret;
+
+ /* This struct is large and allocation could fail, fall back to vmalloc
+ * if there is no other way.
+ */
+ vsock = kzalloc(sizeof(*vsock), GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
+ if (!vsock) {
+ vsock = vmalloc(sizeof(*vsock));
+ if (!vsock)
+ return -ENOMEM;
+ }
+
+ vqs = kmalloc_array(ARRAY_SIZE(vsock->vqs), sizeof(*vqs), GFP_KERNEL);
+ if (!vqs) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ atomic_set(&vsock->queued_replies, 0);
+
+ vqs[VSOCK_VQ_TX] = &vsock->vqs[VSOCK_VQ_TX];
+ vqs[VSOCK_VQ_RX] = &vsock->vqs[VSOCK_VQ_RX];
+ vsock->vqs[VSOCK_VQ_TX].handle_kick = vhost_vsock_handle_tx_kick;
+ vsock->vqs[VSOCK_VQ_RX].handle_kick = vhost_vsock_handle_rx_kick;
+
+ vhost_dev_init(&vsock->dev, vqs, ARRAY_SIZE(vsock->vqs));
+
+ file->private_data = vsock;
+ spin_lock_init(&vsock->send_pkt_list_lock);
+ INIT_LIST_HEAD(&vsock->send_pkt_list);
+ vhost_work_init(&vsock->send_pkt_work, vhost_transport_send_pkt_work);
+
+ spin_lock_bh(&vhost_vsock_lock);
+ list_add_tail(&vsock->list, &vhost_vsock_list);
+ spin_unlock_bh(&vhost_vsock_lock);
+ return 0;
+
+out:
+ vhost_vsock_free(vsock);
+ return ret;
+}
+
+static void vhost_vsock_flush(struct vhost_vsock *vsock)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++)
+ if (vsock->vqs[i].handle_kick)
+ vhost_poll_flush(&vsock->vqs[i].poll);
+ vhost_work_flush(&vsock->dev, &vsock->send_pkt_work);
+}
+
+static void vhost_vsock_reset_orphans(struct sock *sk)
+{
+ struct vsock_sock *vsk = vsock_sk(sk);
+
+ /* vmci_transport.c doesn't take sk_lock here either. At least we're
+ * under vsock_table_lock so the sock cannot disappear while we're
+ * executing.
+ */
+
+ if (!vhost_vsock_get(vsk->local_addr.svm_cid)) {
+ sock_set_flag(sk, SOCK_DONE);
+ vsk->peer_shutdown = SHUTDOWN_MASK;
+ sk->sk_state = SS_UNCONNECTED;
+ sk->sk_err = ECONNRESET;
+ sk->sk_error_report(sk);
+ }
+}
+
+static int vhost_vsock_dev_release(struct inode *inode, struct file *file)
+{
+ struct vhost_vsock *vsock = file->private_data;
+
+ spin_lock_bh(&vhost_vsock_lock);
+ list_del(&vsock->list);
+ spin_unlock_bh(&vhost_vsock_lock);
+
+ /* Iterating over all connections for all CIDs to find orphans is
+ * inefficient. Room for improvement here. */
+ vsock_for_each_connected_socket(vhost_vsock_reset_orphans);
+
+ vhost_vsock_stop(vsock);
+ vhost_vsock_flush(vsock);
+ vhost_dev_stop(&vsock->dev);
+
+ spin_lock_bh(&vsock->send_pkt_list_lock);
+ while (!list_empty(&vsock->send_pkt_list)) {
+ struct virtio_vsock_pkt *pkt;
+
+ pkt = list_first_entry(&vsock->send_pkt_list,
+ struct virtio_vsock_pkt, list);
+ list_del_init(&pkt->list);
+ virtio_transport_free_pkt(pkt);
+ }
+ spin_unlock_bh(&vsock->send_pkt_list_lock);
+
+ vhost_dev_cleanup(&vsock->dev, false);
+ kfree(vsock->dev.vqs);
+ vhost_vsock_free(vsock);
+ return 0;
+}
+
+static int vhost_vsock_set_cid(struct vhost_vsock *vsock, u64 guest_cid)
+{
+ struct vhost_vsock *other;
+
+ /* Refuse reserved CIDs */
+ if (guest_cid <= VMADDR_CID_HOST ||
+ guest_cid == U32_MAX)
+ return -EINVAL;
+
+ /* 64-bit CIDs are not yet supported */
+ if (guest_cid > U32_MAX)
+ return -EINVAL;
+
+ /* Refuse if CID is already in use */
+ other = vhost_vsock_get(guest_cid);
+ if (other && other != vsock)
+ return -EADDRINUSE;
+
+ spin_lock_bh(&vhost_vsock_lock);
+ vsock->guest_cid = guest_cid;
+ spin_unlock_bh(&vhost_vsock_lock);
+
+ return 0;
+}
+
+static int vhost_vsock_set_features(struct vhost_vsock *vsock, u64 features)
+{
+ struct vhost_virtqueue *vq;
+ int i;
+
+ if (features & ~VHOST_VSOCK_FEATURES)
+ return -EOPNOTSUPP;
+
+ mutex_lock(&vsock->dev.mutex);
+ if ((features & (1 << VHOST_F_LOG_ALL)) &&
+ !vhost_log_access_ok(&vsock->dev)) {
+ mutex_unlock(&vsock->dev.mutex);
+ return -EFAULT;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) {
+ vq = &vsock->vqs[i];
+ mutex_lock(&vq->mutex);
+ vq->acked_features = features;
+ mutex_unlock(&vq->mutex);
+ }
+ mutex_unlock(&vsock->dev.mutex);
+ return 0;
+}
+
+static long vhost_vsock_dev_ioctl(struct file *f, unsigned int ioctl,
+ unsigned long arg)
+{
+ struct vhost_vsock *vsock = f->private_data;
+ void __user *argp = (void __user *)arg;
+ u64 guest_cid;
+ u64 features;
+ int start;
+ int r;
+
+ switch (ioctl) {
+ case VHOST_VSOCK_SET_GUEST_CID:
+ if (copy_from_user(&guest_cid, argp, sizeof(guest_cid)))
+ return -EFAULT;
+ return vhost_vsock_set_cid(vsock, guest_cid);
+ case VHOST_VSOCK_SET_RUNNING:
+ if (copy_from_user(&start, argp, sizeof(start)))
+ return -EFAULT;
+ if (start)
+ return vhost_vsock_start(vsock);
+ else
+ return vhost_vsock_stop(vsock);
+ case VHOST_GET_FEATURES:
+ features = VHOST_VSOCK_FEATURES;
+ if (copy_to_user(argp, &features, sizeof(features)))
+ return -EFAULT;
+ return 0;
+ case VHOST_SET_FEATURES:
+ if (copy_from_user(&features, argp, sizeof(features)))
+ return -EFAULT;
+ return vhost_vsock_set_features(vsock, features);
+ default:
+ mutex_lock(&vsock->dev.mutex);
+ r = vhost_dev_ioctl(&vsock->dev, ioctl, argp);
+ if (r == -ENOIOCTLCMD)
+ r = vhost_vring_ioctl(&vsock->dev, ioctl, argp);
+ else
+ vhost_vsock_flush(vsock);
+ mutex_unlock(&vsock->dev.mutex);
+ return r;
+ }
+}
+
+static const struct file_operations vhost_vsock_fops = {
+ .owner = THIS_MODULE,
+ .open = vhost_vsock_dev_open,
+ .release = vhost_vsock_dev_release,
+ .llseek = noop_llseek,
+ .unlocked_ioctl = vhost_vsock_dev_ioctl,
+};
+
+static struct miscdevice vhost_vsock_misc = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = "vhost-vsock",
+ .fops = &vhost_vsock_fops,
+};
+
+static struct virtio_transport vhost_transport = {
+ .transport = {
+ .get_local_cid = vhost_transport_get_local_cid,
+
+ .init = virtio_transport_do_socket_init,
+ .destruct = virtio_transport_destruct,
+ .release = virtio_transport_release,
+ .connect = virtio_transport_connect,
+ .shutdown = virtio_transport_shutdown,
+
+ .dgram_enqueue = virtio_transport_dgram_enqueue,
+ .dgram_dequeue = virtio_transport_dgram_dequeue,
+ .dgram_bind = virtio_transport_dgram_bind,
+ .dgram_allow = virtio_transport_dgram_allow,
+
+ .stream_enqueue = virtio_transport_stream_enqueue,
+ .stream_dequeue = virtio_transport_stream_dequeue,
+ .stream_has_data = virtio_transport_stream_has_data,
+ .stream_has_space = virtio_transport_stream_has_space,
+ .stream_rcvhiwat = virtio_transport_stream_rcvhiwat,
+ .stream_is_active = virtio_transport_stream_is_active,
+ .stream_allow = virtio_transport_stream_allow,
+
+ .notify_poll_in = virtio_transport_notify_poll_in,
+ .notify_poll_out = virtio_transport_notify_poll_out,
+ .notify_recv_init = virtio_transport_notify_recv_init,
+ .notify_recv_pre_block = virtio_transport_notify_recv_pre_block,
+ .notify_recv_pre_dequeue = virtio_transport_notify_recv_pre_dequeue,
+ .notify_recv_post_dequeue = virtio_transport_notify_recv_post_dequeue,
+ .notify_send_init = virtio_transport_notify_send_init,
+ .notify_send_pre_block = virtio_transport_notify_send_pre_block,
+ .notify_send_pre_enqueue = virtio_transport_notify_send_pre_enqueue,
+ .notify_send_post_enqueue = virtio_transport_notify_send_post_enqueue,
+
+ .set_buffer_size = virtio_transport_set_buffer_size,
+ .set_min_buffer_size = virtio_transport_set_min_buffer_size,
+ .set_max_buffer_size = virtio_transport_set_max_buffer_size,
+ .get_buffer_size = virtio_transport_get_buffer_size,
+ .get_min_buffer_size = virtio_transport_get_min_buffer_size,
+ .get_max_buffer_size = virtio_transport_get_max_buffer_size,
+ },
+
+ .send_pkt = vhost_transport_send_pkt,
+};
+
+static int __init vhost_vsock_init(void)
+{
+ int ret;
+
+ ret = vsock_core_init(&vhost_transport.transport);
+ if (ret < 0)
+ return ret;
+ return misc_register(&vhost_vsock_misc);
+};
+
+static void __exit vhost_vsock_exit(void)
+{
+ misc_deregister(&vhost_vsock_misc);
+ vsock_core_exit();
+};
+
+module_init(vhost_vsock_init);
+module_exit(vhost_vsock_exit);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Asias He");
+MODULE_DESCRIPTION("vhost transport for vsock ");
num = min(num, ARRAY_SIZE(vb->pfns));
mutex_lock(&vb->balloon_lock);
+ /* We can't release more pages than taken */
+ num = min(num, (size_t)vb->num_pages);
for (vb->num_pfns = 0; vb->num_pfns < num;
vb->num_pfns += VIRTIO_BALLOON_PAGES_PER_PAGE) {
page = balloon_page_dequeue(vb_dev_info);
#define to_vvq(_vq) container_of(_vq, struct vring_virtqueue, vq)
/*
- * The interaction between virtio and a possible IOMMU is a mess.
+ * Modern virtio devices have feature bits to specify whether they need a
+ * quirk and bypass the IOMMU. If not there, just use the DMA API.
+ *
+ * If there, the interaction between virtio and DMA API is messy.
*
* On most systems with virtio, physical addresses match bus addresses,
* and it doesn't particularly matter whether we use the DMA API.
*
* For the time being, we preserve historic behavior and bypass the DMA
* API.
+ *
+ * TODO: install a per-device DMA ops structure that does the right thing
+ * taking into account all the above quirks, and use the DMA API
+ * unconditionally on data path.
*/
static bool vring_use_dma_api(struct virtio_device *vdev)
{
+ if (!virtio_has_iommu_quirk(vdev))
+ return true;
+
+ /* Otherwise, we are left to guess. */
/*
* In theory, it's possible to have a buggy QEMU-supposed
* emulated Q35 IOMMU and Xen enabled at the same time. On
break;
case VIRTIO_F_VERSION_1:
break;
+ case VIRTIO_F_IOMMU_PLATFORM:
+ break;
default:
/* We don't understand this bit. */
__virtio_clear_bit(vdev, i);
return __virtio_test_bit(vdev, fbit);
}
+/**
+ * virtio_has_iommu_quirk - determine whether this device has the iommu quirk
+ * @vdev: the device
+ */
+static inline bool virtio_has_iommu_quirk(const struct virtio_device *vdev)
+{
+ /*
+ * Note the reverse polarity of the quirk feature (compared to most
+ * other features), this is for compatibility with legacy systems.
+ */
+ return !virtio_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM);
+}
+
static inline
struct virtqueue *virtio_find_single_vq(struct virtio_device *vdev,
vq_callback_t *c, const char *n)
--- /dev/null
+#ifndef _LINUX_VIRTIO_VSOCK_H
+#define _LINUX_VIRTIO_VSOCK_H
+
+#include <uapi/linux/virtio_vsock.h>
+#include <linux/socket.h>
+#include <net/sock.h>
+#include <net/af_vsock.h>
+
+#define VIRTIO_VSOCK_DEFAULT_MIN_BUF_SIZE 128
+#define VIRTIO_VSOCK_DEFAULT_BUF_SIZE (1024 * 256)
+#define VIRTIO_VSOCK_DEFAULT_MAX_BUF_SIZE (1024 * 256)
+#define VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE (1024 * 4)
+#define VIRTIO_VSOCK_MAX_BUF_SIZE 0xFFFFFFFFUL
+#define VIRTIO_VSOCK_MAX_PKT_BUF_SIZE (1024 * 64)
+
+enum {
+ VSOCK_VQ_RX = 0, /* for host to guest data */
+ VSOCK_VQ_TX = 1, /* for guest to host data */
+ VSOCK_VQ_EVENT = 2,
+ VSOCK_VQ_MAX = 3,
+};
+
+/* Per-socket state (accessed via vsk->trans) */
+struct virtio_vsock_sock {
+ struct vsock_sock *vsk;
+
+ /* Protected by lock_sock(sk_vsock(trans->vsk)) */
+ u32 buf_size;
+ u32 buf_size_min;
+ u32 buf_size_max;
+
+ spinlock_t tx_lock;
+ spinlock_t rx_lock;
+
+ /* Protected by tx_lock */
+ u32 tx_cnt;
+ u32 buf_alloc;
+ u32 peer_fwd_cnt;
+ u32 peer_buf_alloc;
+
+ /* Protected by rx_lock */
+ u32 fwd_cnt;
+ u32 rx_bytes;
+ struct list_head rx_queue;
+};
+
+struct virtio_vsock_pkt {
+ struct virtio_vsock_hdr hdr;
+ struct work_struct work;
+ struct list_head list;
+ void *buf;
+ u32 len;
+ u32 off;
+ bool reply;
+};
+
+struct virtio_vsock_pkt_info {
+ u32 remote_cid, remote_port;
+ struct msghdr *msg;
+ u32 pkt_len;
+ u16 type;
+ u16 op;
+ u32 flags;
+ bool reply;
+};
+
+struct virtio_transport {
+ /* This must be the first field */
+ struct vsock_transport transport;
+
+ /* Takes ownership of the packet */
+ int (*send_pkt)(struct virtio_vsock_pkt *pkt);
+};
+
+ssize_t
+virtio_transport_stream_dequeue(struct vsock_sock *vsk,
+ struct msghdr *msg,
+ size_t len,
+ int type);
+int
+virtio_transport_dgram_dequeue(struct vsock_sock *vsk,
+ struct msghdr *msg,
+ size_t len, int flags);
+
+s64 virtio_transport_stream_has_data(struct vsock_sock *vsk);
+s64 virtio_transport_stream_has_space(struct vsock_sock *vsk);
+
+int virtio_transport_do_socket_init(struct vsock_sock *vsk,
+ struct vsock_sock *psk);
+u64 virtio_transport_get_buffer_size(struct vsock_sock *vsk);
+u64 virtio_transport_get_min_buffer_size(struct vsock_sock *vsk);
+u64 virtio_transport_get_max_buffer_size(struct vsock_sock *vsk);
+void virtio_transport_set_buffer_size(struct vsock_sock *vsk, u64 val);
+void virtio_transport_set_min_buffer_size(struct vsock_sock *vsk, u64 val);
+void virtio_transport_set_max_buffer_size(struct vsock_sock *vs, u64 val);
+int
+virtio_transport_notify_poll_in(struct vsock_sock *vsk,
+ size_t target,
+ bool *data_ready_now);
+int
+virtio_transport_notify_poll_out(struct vsock_sock *vsk,
+ size_t target,
+ bool *space_available_now);
+
+int virtio_transport_notify_recv_init(struct vsock_sock *vsk,
+ size_t target, struct vsock_transport_recv_notify_data *data);
+int virtio_transport_notify_recv_pre_block(struct vsock_sock *vsk,
+ size_t target, struct vsock_transport_recv_notify_data *data);
+int virtio_transport_notify_recv_pre_dequeue(struct vsock_sock *vsk,
+ size_t target, struct vsock_transport_recv_notify_data *data);
+int virtio_transport_notify_recv_post_dequeue(struct vsock_sock *vsk,
+ size_t target, ssize_t copied, bool data_read,
+ struct vsock_transport_recv_notify_data *data);
+int virtio_transport_notify_send_init(struct vsock_sock *vsk,
+ struct vsock_transport_send_notify_data *data);
+int virtio_transport_notify_send_pre_block(struct vsock_sock *vsk,
+ struct vsock_transport_send_notify_data *data);
+int virtio_transport_notify_send_pre_enqueue(struct vsock_sock *vsk,
+ struct vsock_transport_send_notify_data *data);
+int virtio_transport_notify_send_post_enqueue(struct vsock_sock *vsk,
+ ssize_t written, struct vsock_transport_send_notify_data *data);
+
+u64 virtio_transport_stream_rcvhiwat(struct vsock_sock *vsk);
+bool virtio_transport_stream_is_active(struct vsock_sock *vsk);
+bool virtio_transport_stream_allow(u32 cid, u32 port);
+int virtio_transport_dgram_bind(struct vsock_sock *vsk,
+ struct sockaddr_vm *addr);
+bool virtio_transport_dgram_allow(u32 cid, u32 port);
+
+int virtio_transport_connect(struct vsock_sock *vsk);
+
+int virtio_transport_shutdown(struct vsock_sock *vsk, int mode);
+
+void virtio_transport_release(struct vsock_sock *vsk);
+
+ssize_t
+virtio_transport_stream_enqueue(struct vsock_sock *vsk,
+ struct msghdr *msg,
+ size_t len);
+int
+virtio_transport_dgram_enqueue(struct vsock_sock *vsk,
+ struct sockaddr_vm *remote_addr,
+ struct msghdr *msg,
+ size_t len);
+
+void virtio_transport_destruct(struct vsock_sock *vsk);
+
+void virtio_transport_recv_pkt(struct virtio_vsock_pkt *pkt);
+void virtio_transport_free_pkt(struct virtio_vsock_pkt *pkt);
+void virtio_transport_inc_tx_pkt(struct virtio_vsock_sock *vvs, struct virtio_vsock_pkt *pkt);
+u32 virtio_transport_get_credit(struct virtio_vsock_sock *vvs, u32 wanted);
+void virtio_transport_put_credit(struct virtio_vsock_sock *vvs, u32 credit);
+
+#endif /* _LINUX_VIRTIO_VSOCK_H */
struct list_head accept_queue;
bool rejected;
struct delayed_work dwork;
+ struct delayed_work close_work;
+ bool close_work_scheduled;
u32 peer_shutdown;
bool sent_request;
bool ignore_connecting_rst;
}
void vsock_core_exit(void);
+/* The transport may downcast this to access transport-specific functions */
+const struct vsock_transport *vsock_core_get_transport(void);
+
/**** UTILS ****/
void vsock_release_pending(struct sock *pending);
struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr);
struct sock *vsock_find_connected_socket(struct sockaddr_vm *src,
struct sockaddr_vm *dst);
+void vsock_remove_sock(struct vsock_sock *vsk);
void vsock_for_each_connected_socket(void (*fn)(struct sock *sk));
#endif /* __AF_VSOCK_H__ */
--- /dev/null
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM vsock
+
+#if !defined(_TRACE_VSOCK_VIRTIO_TRANSPORT_COMMON_H) || \
+ defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_VSOCK_VIRTIO_TRANSPORT_COMMON_H
+
+#include <linux/tracepoint.h>
+
+TRACE_DEFINE_ENUM(VIRTIO_VSOCK_TYPE_STREAM);
+
+#define show_type(val) \
+ __print_symbolic(val, { VIRTIO_VSOCK_TYPE_STREAM, "STREAM" })
+
+TRACE_DEFINE_ENUM(VIRTIO_VSOCK_OP_INVALID);
+TRACE_DEFINE_ENUM(VIRTIO_VSOCK_OP_REQUEST);
+TRACE_DEFINE_ENUM(VIRTIO_VSOCK_OP_RESPONSE);
+TRACE_DEFINE_ENUM(VIRTIO_VSOCK_OP_RST);
+TRACE_DEFINE_ENUM(VIRTIO_VSOCK_OP_SHUTDOWN);
+TRACE_DEFINE_ENUM(VIRTIO_VSOCK_OP_RW);
+TRACE_DEFINE_ENUM(VIRTIO_VSOCK_OP_CREDIT_UPDATE);
+TRACE_DEFINE_ENUM(VIRTIO_VSOCK_OP_CREDIT_REQUEST);
+
+#define show_op(val) \
+ __print_symbolic(val, \
+ { VIRTIO_VSOCK_OP_INVALID, "INVALID" }, \
+ { VIRTIO_VSOCK_OP_REQUEST, "REQUEST" }, \
+ { VIRTIO_VSOCK_OP_RESPONSE, "RESPONSE" }, \
+ { VIRTIO_VSOCK_OP_RST, "RST" }, \
+ { VIRTIO_VSOCK_OP_SHUTDOWN, "SHUTDOWN" }, \
+ { VIRTIO_VSOCK_OP_RW, "RW" }, \
+ { VIRTIO_VSOCK_OP_CREDIT_UPDATE, "CREDIT_UPDATE" }, \
+ { VIRTIO_VSOCK_OP_CREDIT_REQUEST, "CREDIT_REQUEST" })
+
+TRACE_EVENT(virtio_transport_alloc_pkt,
+ TP_PROTO(
+ __u32 src_cid, __u32 src_port,
+ __u32 dst_cid, __u32 dst_port,
+ __u32 len,
+ __u16 type,
+ __u16 op,
+ __u32 flags
+ ),
+ TP_ARGS(
+ src_cid, src_port,
+ dst_cid, dst_port,
+ len,
+ type,
+ op,
+ flags
+ ),
+ TP_STRUCT__entry(
+ __field(__u32, src_cid)
+ __field(__u32, src_port)
+ __field(__u32, dst_cid)
+ __field(__u32, dst_port)
+ __field(__u32, len)
+ __field(__u16, type)
+ __field(__u16, op)
+ __field(__u32, flags)
+ ),
+ TP_fast_assign(
+ __entry->src_cid = src_cid;
+ __entry->src_port = src_port;
+ __entry->dst_cid = dst_cid;
+ __entry->dst_port = dst_port;
+ __entry->len = len;
+ __entry->type = type;
+ __entry->op = op;
+ __entry->flags = flags;
+ ),
+ TP_printk("%u:%u -> %u:%u len=%u type=%s op=%s flags=%#x",
+ __entry->src_cid, __entry->src_port,
+ __entry->dst_cid, __entry->dst_port,
+ __entry->len,
+ show_type(__entry->type),
+ show_op(__entry->op),
+ __entry->flags)
+);
+
+TRACE_EVENT(virtio_transport_recv_pkt,
+ TP_PROTO(
+ __u32 src_cid, __u32 src_port,
+ __u32 dst_cid, __u32 dst_port,
+ __u32 len,
+ __u16 type,
+ __u16 op,
+ __u32 flags,
+ __u32 buf_alloc,
+ __u32 fwd_cnt
+ ),
+ TP_ARGS(
+ src_cid, src_port,
+ dst_cid, dst_port,
+ len,
+ type,
+ op,
+ flags,
+ buf_alloc,
+ fwd_cnt
+ ),
+ TP_STRUCT__entry(
+ __field(__u32, src_cid)
+ __field(__u32, src_port)
+ __field(__u32, dst_cid)
+ __field(__u32, dst_port)
+ __field(__u32, len)
+ __field(__u16, type)
+ __field(__u16, op)
+ __field(__u32, flags)
+ __field(__u32, buf_alloc)
+ __field(__u32, fwd_cnt)
+ ),
+ TP_fast_assign(
+ __entry->src_cid = src_cid;
+ __entry->src_port = src_port;
+ __entry->dst_cid = dst_cid;
+ __entry->dst_port = dst_port;
+ __entry->len = len;
+ __entry->type = type;
+ __entry->op = op;
+ __entry->flags = flags;
+ __entry->buf_alloc = buf_alloc;
+ __entry->fwd_cnt = fwd_cnt;
+ ),
+ TP_printk("%u:%u -> %u:%u len=%u type=%s op=%s flags=%#x "
+ "buf_alloc=%u fwd_cnt=%u",
+ __entry->src_cid, __entry->src_port,
+ __entry->dst_cid, __entry->dst_port,
+ __entry->len,
+ show_type(__entry->type),
+ show_op(__entry->op),
+ __entry->flags,
+ __entry->buf_alloc,
+ __entry->fwd_cnt)
+);
+
+#endif /* _TRACE_VSOCK_VIRTIO_TRANSPORT_COMMON_H */
+
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE vsock_virtio_transport_common
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
header-y += virtio_rng.h
header-y += virtio_scsi.h
header-y += virtio_types.h
+header-y += virtio_vsock.h
header-y += vm_sockets.h
header-y += vt.h
header-y += vtpm_proxy.h
__u64 log_guest_addr;
};
+/* no alignment requirement */
+struct vhost_iotlb_msg {
+ __u64 iova;
+ __u64 size;
+ __u64 uaddr;
+#define VHOST_ACCESS_RO 0x1
+#define VHOST_ACCESS_WO 0x2
+#define VHOST_ACCESS_RW 0x3
+ __u8 perm;
+#define VHOST_IOTLB_MISS 1
+#define VHOST_IOTLB_UPDATE 2
+#define VHOST_IOTLB_INVALIDATE 3
+#define VHOST_IOTLB_ACCESS_FAIL 4
+ __u8 type;
+};
+
+#define VHOST_IOTLB_MSG 0x1
+
+struct vhost_msg {
+ int type;
+ union {
+ struct vhost_iotlb_msg iotlb;
+ __u8 padding[64];
+ };
+};
+
struct vhost_memory_region {
__u64 guest_phys_addr;
__u64 memory_size; /* bytes */
#define VHOST_F_LOG_ALL 26
/* vhost-net should add virtio_net_hdr for RX, and strip for TX packets. */
#define VHOST_NET_F_VIRTIO_NET_HDR 27
+/* Vhost have device IOTLB */
+#define VHOST_F_DEVICE_IOTLB 63
/* VHOST_SCSI specific definitions */
#define VHOST_SCSI_SET_EVENTS_MISSED _IOW(VHOST_VIRTIO, 0x43, __u32)
#define VHOST_SCSI_GET_EVENTS_MISSED _IOW(VHOST_VIRTIO, 0x44, __u32)
+/* VHOST_VSOCK specific defines */
+
+#define VHOST_VSOCK_SET_GUEST_CID _IOW(VHOST_VIRTIO, 0x60, __u64)
+#define VHOST_VSOCK_SET_RUNNING _IOW(VHOST_VIRTIO, 0x61, int)
+
#endif
* transport being used (eg. virtio_ring), the rest are per-device feature
* bits. */
#define VIRTIO_TRANSPORT_F_START 28
-#define VIRTIO_TRANSPORT_F_END 33
+#define VIRTIO_TRANSPORT_F_END 34
#ifndef VIRTIO_CONFIG_NO_LEGACY
/* Do we get callbacks when the ring is completely used, even if we've
/* v1.0 compliant. */
#define VIRTIO_F_VERSION_1 32
+/*
+ * If clear - device has the IOMMU bypass quirk feature.
+ * If set - use platform tools to detect the IOMMU.
+ *
+ * Note the reverse polarity (compared to most other features),
+ * this is for compatibility with legacy systems.
+ */
+#define VIRTIO_F_IOMMU_PLATFORM 33
#endif /* _UAPI_LINUX_VIRTIO_CONFIG_H */
#define VIRTIO_ID_CAIF 12 /* Virtio caif */
#define VIRTIO_ID_GPU 16 /* virtio GPU */
#define VIRTIO_ID_INPUT 18 /* virtio input */
+#define VIRTIO_ID_VSOCK 19 /* virtio vsock transport */
#endif /* _LINUX_VIRTIO_IDS_H */
--- /dev/null
+/*
+ * This header, excluding the #ifdef __KERNEL__ part, is BSD licensed so
+ * anyone can use the definitions to implement compatible drivers/servers:
+ *
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of IBM nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * Copyright (C) Red Hat, Inc., 2013-2015
+ * Copyright (C) Asias He <asias@redhat.com>, 2013
+ * Copyright (C) Stefan Hajnoczi <stefanha@redhat.com>, 2015
+ */
+
+#ifndef _UAPI_LINUX_VIRTIO_VSOCK_H
+#define _UAPI_LINUX_VIRTIO_VOSCK_H
+
+#include <linux/types.h>
+#include <linux/virtio_ids.h>
+#include <linux/virtio_config.h>
+
+struct virtio_vsock_config {
+ __le64 guest_cid;
+} __attribute__((packed));
+
+enum virtio_vsock_event_id {
+ VIRTIO_VSOCK_EVENT_TRANSPORT_RESET = 0,
+};
+
+struct virtio_vsock_event {
+ __le32 id;
+} __attribute__((packed));
+
+struct virtio_vsock_hdr {
+ __le64 src_cid;
+ __le64 dst_cid;
+ __le32 src_port;
+ __le32 dst_port;
+ __le32 len;
+ __le16 type; /* enum virtio_vsock_type */
+ __le16 op; /* enum virtio_vsock_op */
+ __le32 flags;
+ __le32 buf_alloc;
+ __le32 fwd_cnt;
+} __attribute__((packed));
+
+enum virtio_vsock_type {
+ VIRTIO_VSOCK_TYPE_STREAM = 1,
+};
+
+enum virtio_vsock_op {
+ VIRTIO_VSOCK_OP_INVALID = 0,
+
+ /* Connect operations */
+ VIRTIO_VSOCK_OP_REQUEST = 1,
+ VIRTIO_VSOCK_OP_RESPONSE = 2,
+ VIRTIO_VSOCK_OP_RST = 3,
+ VIRTIO_VSOCK_OP_SHUTDOWN = 4,
+
+ /* To send payload */
+ VIRTIO_VSOCK_OP_RW = 5,
+
+ /* Tell the peer our credit info */
+ VIRTIO_VSOCK_OP_CREDIT_UPDATE = 6,
+ /* Request the peer to send the credit info to us */
+ VIRTIO_VSOCK_OP_CREDIT_REQUEST = 7,
+};
+
+/* VIRTIO_VSOCK_OP_SHUTDOWN flags values */
+enum virtio_vsock_shutdown {
+ VIRTIO_VSOCK_SHUTDOWN_RCV = 1,
+ VIRTIO_VSOCK_SHUTDOWN_SEND = 2,
+};
+
+#endif /* _UAPI_LINUX_VIRTIO_VSOCK_H */
To compile this driver as a module, choose M here: the module
will be called vmw_vsock_vmci_transport. If unsure, say N.
+
+config VIRTIO_VSOCKETS
+ tristate "virtio transport for Virtual Sockets"
+ depends on VSOCKETS && VIRTIO
+ select VIRTIO_VSOCKETS_COMMON
+ help
+ This module implements a virtio transport for Virtual Sockets.
+
+ Enable this transport if your Virtual Machine host supports Virtual
+ Sockets over virtio.
+
+ To compile this driver as a module, choose M here: the module will be
+ called vmw_vsock_virtio_transport. If unsure, say N.
+
+config VIRTIO_VSOCKETS_COMMON
+ tristate
+ help
+ This option is selected by any driver which needs to access
+ the virtio_vsock. The module will be called
+ vmw_vsock_virtio_transport_common.
obj-$(CONFIG_VSOCKETS) += vsock.o
obj-$(CONFIG_VMWARE_VMCI_VSOCKETS) += vmw_vsock_vmci_transport.o
+obj-$(CONFIG_VIRTIO_VSOCKETS) += vmw_vsock_virtio_transport.o
+obj-$(CONFIG_VIRTIO_VSOCKETS_COMMON) += vmw_vsock_virtio_transport_common.o
vsock-y += af_vsock.o vsock_addr.o
vmw_vsock_vmci_transport-y += vmci_transport.o vmci_transport_notify.o \
vmci_transport_notify_qstate.o
+
+vmw_vsock_virtio_transport-y += virtio_transport.o
+
+vmw_vsock_virtio_transport_common-y += virtio_transport_common.o
return ret;
}
+void vsock_remove_sock(struct vsock_sock *vsk)
+{
+ if (vsock_in_bound_table(vsk))
+ vsock_remove_bound(vsk);
+
+ if (vsock_in_connected_table(vsk))
+ vsock_remove_connected(vsk);
+}
+EXPORT_SYMBOL_GPL(vsock_remove_sock);
+
void vsock_for_each_connected_socket(void (*fn)(struct sock *sk))
{
int i;
vsk = vsock_sk(sk);
pending = NULL; /* Compiler warning. */
- if (vsock_in_bound_table(vsk))
- vsock_remove_bound(vsk);
-
- if (vsock_in_connected_table(vsk))
- vsock_remove_connected(vsk);
-
transport->release(vsk);
lock_sock(sk);
}
EXPORT_SYMBOL_GPL(vsock_core_exit);
+const struct vsock_transport *vsock_core_get_transport(void)
+{
+ /* vsock_register_mutex not taken since only the transport uses this
+ * function and only while registered.
+ */
+ return transport;
+}
+EXPORT_SYMBOL_GPL(vsock_core_get_transport);
+
MODULE_AUTHOR("VMware, Inc.");
MODULE_DESCRIPTION("VMware Virtual Socket Family");
MODULE_VERSION("1.0.1.0-k");
--- /dev/null
+/*
+ * virtio transport for vsock
+ *
+ * Copyright (C) 2013-2015 Red Hat, Inc.
+ * Author: Asias He <asias@redhat.com>
+ * Stefan Hajnoczi <stefanha@redhat.com>
+ *
+ * Some of the code is take from Gerd Hoffmann <kraxel@redhat.com>'s
+ * early virtio-vsock proof-of-concept bits.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.
+ */
+#include <linux/spinlock.h>
+#include <linux/module.h>
+#include <linux/list.h>
+#include <linux/atomic.h>
+#include <linux/virtio.h>
+#include <linux/virtio_ids.h>
+#include <linux/virtio_config.h>
+#include <linux/virtio_vsock.h>
+#include <net/sock.h>
+#include <linux/mutex.h>
+#include <net/af_vsock.h>
+
+static struct workqueue_struct *virtio_vsock_workqueue;
+static struct virtio_vsock *the_virtio_vsock;
+static DEFINE_MUTEX(the_virtio_vsock_mutex); /* protects the_virtio_vsock */
+
+struct virtio_vsock {
+ struct virtio_device *vdev;
+ struct virtqueue *vqs[VSOCK_VQ_MAX];
+
+ /* Virtqueue processing is deferred to a workqueue */
+ struct work_struct tx_work;
+ struct work_struct rx_work;
+ struct work_struct event_work;
+
+ /* The following fields are protected by tx_lock. vqs[VSOCK_VQ_TX]
+ * must be accessed with tx_lock held.
+ */
+ struct mutex tx_lock;
+
+ struct work_struct send_pkt_work;
+ spinlock_t send_pkt_list_lock;
+ struct list_head send_pkt_list;
+
+ atomic_t queued_replies;
+
+ /* The following fields are protected by rx_lock. vqs[VSOCK_VQ_RX]
+ * must be accessed with rx_lock held.
+ */
+ struct mutex rx_lock;
+ int rx_buf_nr;
+ int rx_buf_max_nr;
+
+ /* The following fields are protected by event_lock.
+ * vqs[VSOCK_VQ_EVENT] must be accessed with event_lock held.
+ */
+ struct mutex event_lock;
+ struct virtio_vsock_event event_list[8];
+
+ u32 guest_cid;
+};
+
+static struct virtio_vsock *virtio_vsock_get(void)
+{
+ return the_virtio_vsock;
+}
+
+static u32 virtio_transport_get_local_cid(void)
+{
+ struct virtio_vsock *vsock = virtio_vsock_get();
+
+ return vsock->guest_cid;
+}
+
+static void
+virtio_transport_send_pkt_work(struct work_struct *work)
+{
+ struct virtio_vsock *vsock =
+ container_of(work, struct virtio_vsock, send_pkt_work);
+ struct virtqueue *vq;
+ bool added = false;
+ bool restart_rx = false;
+
+ mutex_lock(&vsock->tx_lock);
+
+ vq = vsock->vqs[VSOCK_VQ_TX];
+
+ /* Avoid unnecessary interrupts while we're processing the ring */
+ virtqueue_disable_cb(vq);
+
+ for (;;) {
+ struct virtio_vsock_pkt *pkt;
+ struct scatterlist hdr, buf, *sgs[2];
+ int ret, in_sg = 0, out_sg = 0;
+ bool reply;
+
+ spin_lock_bh(&vsock->send_pkt_list_lock);
+ if (list_empty(&vsock->send_pkt_list)) {
+ spin_unlock_bh(&vsock->send_pkt_list_lock);
+ virtqueue_enable_cb(vq);
+ break;
+ }
+
+ pkt = list_first_entry(&vsock->send_pkt_list,
+ struct virtio_vsock_pkt, list);
+ list_del_init(&pkt->list);
+ spin_unlock_bh(&vsock->send_pkt_list_lock);
+
+ reply = pkt->reply;
+
+ sg_init_one(&hdr, &pkt->hdr, sizeof(pkt->hdr));
+ sgs[out_sg++] = &hdr;
+ if (pkt->buf) {
+ sg_init_one(&buf, pkt->buf, pkt->len);
+ sgs[out_sg++] = &buf;
+ }
+
+ ret = virtqueue_add_sgs(vq, sgs, out_sg, in_sg, pkt, GFP_KERNEL);
+ if (ret < 0) {
+ spin_lock_bh(&vsock->send_pkt_list_lock);
+ list_add(&pkt->list, &vsock->send_pkt_list);
+ spin_unlock_bh(&vsock->send_pkt_list_lock);
+
+ if (!virtqueue_enable_cb(vq) && ret == -ENOSPC)
+ continue; /* retry now that we have more space */
+ break;
+ }
+
+ if (reply) {
+ struct virtqueue *rx_vq = vsock->vqs[VSOCK_VQ_RX];
+ int val;
+
+ val = atomic_dec_return(&vsock->queued_replies);
+
+ /* Do we now have resources to resume rx processing? */
+ if (val + 1 == virtqueue_get_vring_size(rx_vq))
+ restart_rx = true;
+ }
+
+ added = true;
+ }
+
+ if (added)
+ virtqueue_kick(vq);
+
+ mutex_unlock(&vsock->tx_lock);
+
+ if (restart_rx)
+ queue_work(virtio_vsock_workqueue, &vsock->rx_work);
+}
+
+static int
+virtio_transport_send_pkt(struct virtio_vsock_pkt *pkt)
+{
+ struct virtio_vsock *vsock;
+ int len = pkt->len;
+
+ vsock = virtio_vsock_get();
+ if (!vsock) {
+ virtio_transport_free_pkt(pkt);
+ return -ENODEV;
+ }
+
+ if (pkt->reply)
+ atomic_inc(&vsock->queued_replies);
+
+ spin_lock_bh(&vsock->send_pkt_list_lock);
+ list_add_tail(&pkt->list, &vsock->send_pkt_list);
+ spin_unlock_bh(&vsock->send_pkt_list_lock);
+
+ queue_work(virtio_vsock_workqueue, &vsock->send_pkt_work);
+ return len;
+}
+
+static void virtio_vsock_rx_fill(struct virtio_vsock *vsock)
+{
+ int buf_len = VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE;
+ struct virtio_vsock_pkt *pkt;
+ struct scatterlist hdr, buf, *sgs[2];
+ struct virtqueue *vq;
+ int ret;
+
+ vq = vsock->vqs[VSOCK_VQ_RX];
+
+ do {
+ pkt = kzalloc(sizeof(*pkt), GFP_KERNEL);
+ if (!pkt)
+ break;
+
+ pkt->buf = kmalloc(buf_len, GFP_KERNEL);
+ if (!pkt->buf) {
+ virtio_transport_free_pkt(pkt);
+ break;
+ }
+
+ pkt->len = buf_len;
+
+ sg_init_one(&hdr, &pkt->hdr, sizeof(pkt->hdr));
+ sgs[0] = &hdr;
+
+ sg_init_one(&buf, pkt->buf, buf_len);
+ sgs[1] = &buf;
+ ret = virtqueue_add_sgs(vq, sgs, 0, 2, pkt, GFP_KERNEL);
+ if (ret) {
+ virtio_transport_free_pkt(pkt);
+ break;
+ }
+ vsock->rx_buf_nr++;
+ } while (vq->num_free);
+ if (vsock->rx_buf_nr > vsock->rx_buf_max_nr)
+ vsock->rx_buf_max_nr = vsock->rx_buf_nr;
+ virtqueue_kick(vq);
+}
+
+static void virtio_transport_tx_work(struct work_struct *work)
+{
+ struct virtio_vsock *vsock =
+ container_of(work, struct virtio_vsock, tx_work);
+ struct virtqueue *vq;
+ bool added = false;
+
+ vq = vsock->vqs[VSOCK_VQ_TX];
+ mutex_lock(&vsock->tx_lock);
+ do {
+ struct virtio_vsock_pkt *pkt;
+ unsigned int len;
+
+ virtqueue_disable_cb(vq);
+ while ((pkt = virtqueue_get_buf(vq, &len)) != NULL) {
+ virtio_transport_free_pkt(pkt);
+ added = true;
+ }
+ } while (!virtqueue_enable_cb(vq));
+ mutex_unlock(&vsock->tx_lock);
+
+ if (added)
+ queue_work(virtio_vsock_workqueue, &vsock->send_pkt_work);
+}
+
+/* Is there space left for replies to rx packets? */
+static bool virtio_transport_more_replies(struct virtio_vsock *vsock)
+{
+ struct virtqueue *vq = vsock->vqs[VSOCK_VQ_RX];
+ int val;
+
+ smp_rmb(); /* paired with atomic_inc() and atomic_dec_return() */
+ val = atomic_read(&vsock->queued_replies);
+
+ return val < virtqueue_get_vring_size(vq);
+}
+
+static void virtio_transport_rx_work(struct work_struct *work)
+{
+ struct virtio_vsock *vsock =
+ container_of(work, struct virtio_vsock, rx_work);
+ struct virtqueue *vq;
+
+ vq = vsock->vqs[VSOCK_VQ_RX];
+
+ mutex_lock(&vsock->rx_lock);
+
+ do {
+ virtqueue_disable_cb(vq);
+ for (;;) {
+ struct virtio_vsock_pkt *pkt;
+ unsigned int len;
+
+ if (!virtio_transport_more_replies(vsock)) {
+ /* Stop rx until the device processes already
+ * pending replies. Leave rx virtqueue
+ * callbacks disabled.
+ */
+ goto out;
+ }
+
+ pkt = virtqueue_get_buf(vq, &len);
+ if (!pkt) {
+ break;
+ }
+
+ vsock->rx_buf_nr--;
+
+ /* Drop short/long packets */
+ if (unlikely(len < sizeof(pkt->hdr) ||
+ len > sizeof(pkt->hdr) + pkt->len)) {
+ virtio_transport_free_pkt(pkt);
+ continue;
+ }
+
+ pkt->len = len - sizeof(pkt->hdr);
+ virtio_transport_recv_pkt(pkt);
+ }
+ } while (!virtqueue_enable_cb(vq));
+
+out:
+ if (vsock->rx_buf_nr < vsock->rx_buf_max_nr / 2)
+ virtio_vsock_rx_fill(vsock);
+ mutex_unlock(&vsock->rx_lock);
+}
+
+/* event_lock must be held */
+static int virtio_vsock_event_fill_one(struct virtio_vsock *vsock,
+ struct virtio_vsock_event *event)
+{
+ struct scatterlist sg;
+ struct virtqueue *vq;
+
+ vq = vsock->vqs[VSOCK_VQ_EVENT];
+
+ sg_init_one(&sg, event, sizeof(*event));
+
+ return virtqueue_add_inbuf(vq, &sg, 1, event, GFP_KERNEL);
+}
+
+/* event_lock must be held */
+static void virtio_vsock_event_fill(struct virtio_vsock *vsock)
+{
+ size_t i;
+
+ for (i = 0; i < ARRAY_SIZE(vsock->event_list); i++) {
+ struct virtio_vsock_event *event = &vsock->event_list[i];
+
+ virtio_vsock_event_fill_one(vsock, event);
+ }
+
+ virtqueue_kick(vsock->vqs[VSOCK_VQ_EVENT]);
+}
+
+static void virtio_vsock_reset_sock(struct sock *sk)
+{
+ lock_sock(sk);
+ sk->sk_state = SS_UNCONNECTED;
+ sk->sk_err = ECONNRESET;
+ sk->sk_error_report(sk);
+ release_sock(sk);
+}
+
+static void virtio_vsock_update_guest_cid(struct virtio_vsock *vsock)
+{
+ struct virtio_device *vdev = vsock->vdev;
+ u64 guest_cid;
+
+ vdev->config->get(vdev, offsetof(struct virtio_vsock_config, guest_cid),
+ &guest_cid, sizeof(guest_cid));
+ vsock->guest_cid = le64_to_cpu(guest_cid);
+}
+
+/* event_lock must be held */
+static void virtio_vsock_event_handle(struct virtio_vsock *vsock,
+ struct virtio_vsock_event *event)
+{
+ switch (le32_to_cpu(event->id)) {
+ case VIRTIO_VSOCK_EVENT_TRANSPORT_RESET:
+ virtio_vsock_update_guest_cid(vsock);
+ vsock_for_each_connected_socket(virtio_vsock_reset_sock);
+ break;
+ }
+}
+
+static void virtio_transport_event_work(struct work_struct *work)
+{
+ struct virtio_vsock *vsock =
+ container_of(work, struct virtio_vsock, event_work);
+ struct virtqueue *vq;
+
+ vq = vsock->vqs[VSOCK_VQ_EVENT];
+
+ mutex_lock(&vsock->event_lock);
+
+ do {
+ struct virtio_vsock_event *event;
+ unsigned int len;
+
+ virtqueue_disable_cb(vq);
+ while ((event = virtqueue_get_buf(vq, &len)) != NULL) {
+ if (len == sizeof(*event))
+ virtio_vsock_event_handle(vsock, event);
+
+ virtio_vsock_event_fill_one(vsock, event);
+ }
+ } while (!virtqueue_enable_cb(vq));
+
+ virtqueue_kick(vsock->vqs[VSOCK_VQ_EVENT]);
+
+ mutex_unlock(&vsock->event_lock);
+}
+
+static void virtio_vsock_event_done(struct virtqueue *vq)
+{
+ struct virtio_vsock *vsock = vq->vdev->priv;
+
+ if (!vsock)
+ return;
+ queue_work(virtio_vsock_workqueue, &vsock->event_work);
+}
+
+static void virtio_vsock_tx_done(struct virtqueue *vq)
+{
+ struct virtio_vsock *vsock = vq->vdev->priv;
+
+ if (!vsock)
+ return;
+ queue_work(virtio_vsock_workqueue, &vsock->tx_work);
+}
+
+static void virtio_vsock_rx_done(struct virtqueue *vq)
+{
+ struct virtio_vsock *vsock = vq->vdev->priv;
+
+ if (!vsock)
+ return;
+ queue_work(virtio_vsock_workqueue, &vsock->rx_work);
+}
+
+static struct virtio_transport virtio_transport = {
+ .transport = {
+ .get_local_cid = virtio_transport_get_local_cid,
+
+ .init = virtio_transport_do_socket_init,
+ .destruct = virtio_transport_destruct,
+ .release = virtio_transport_release,
+ .connect = virtio_transport_connect,
+ .shutdown = virtio_transport_shutdown,
+
+ .dgram_bind = virtio_transport_dgram_bind,
+ .dgram_dequeue = virtio_transport_dgram_dequeue,
+ .dgram_enqueue = virtio_transport_dgram_enqueue,
+ .dgram_allow = virtio_transport_dgram_allow,
+
+ .stream_dequeue = virtio_transport_stream_dequeue,
+ .stream_enqueue = virtio_transport_stream_enqueue,
+ .stream_has_data = virtio_transport_stream_has_data,
+ .stream_has_space = virtio_transport_stream_has_space,
+ .stream_rcvhiwat = virtio_transport_stream_rcvhiwat,
+ .stream_is_active = virtio_transport_stream_is_active,
+ .stream_allow = virtio_transport_stream_allow,
+
+ .notify_poll_in = virtio_transport_notify_poll_in,
+ .notify_poll_out = virtio_transport_notify_poll_out,
+ .notify_recv_init = virtio_transport_notify_recv_init,
+ .notify_recv_pre_block = virtio_transport_notify_recv_pre_block,
+ .notify_recv_pre_dequeue = virtio_transport_notify_recv_pre_dequeue,
+ .notify_recv_post_dequeue = virtio_transport_notify_recv_post_dequeue,
+ .notify_send_init = virtio_transport_notify_send_init,
+ .notify_send_pre_block = virtio_transport_notify_send_pre_block,
+ .notify_send_pre_enqueue = virtio_transport_notify_send_pre_enqueue,
+ .notify_send_post_enqueue = virtio_transport_notify_send_post_enqueue,
+
+ .set_buffer_size = virtio_transport_set_buffer_size,
+ .set_min_buffer_size = virtio_transport_set_min_buffer_size,
+ .set_max_buffer_size = virtio_transport_set_max_buffer_size,
+ .get_buffer_size = virtio_transport_get_buffer_size,
+ .get_min_buffer_size = virtio_transport_get_min_buffer_size,
+ .get_max_buffer_size = virtio_transport_get_max_buffer_size,
+ },
+
+ .send_pkt = virtio_transport_send_pkt,
+};
+
+static int virtio_vsock_probe(struct virtio_device *vdev)
+{
+ vq_callback_t *callbacks[] = {
+ virtio_vsock_rx_done,
+ virtio_vsock_tx_done,
+ virtio_vsock_event_done,
+ };
+ static const char * const names[] = {
+ "rx",
+ "tx",
+ "event",
+ };
+ struct virtio_vsock *vsock = NULL;
+ int ret;
+
+ ret = mutex_lock_interruptible(&the_virtio_vsock_mutex);
+ if (ret)
+ return ret;
+
+ /* Only one virtio-vsock device per guest is supported */
+ if (the_virtio_vsock) {
+ ret = -EBUSY;
+ goto out;
+ }
+
+ vsock = kzalloc(sizeof(*vsock), GFP_KERNEL);
+ if (!vsock) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ vsock->vdev = vdev;
+
+ ret = vsock->vdev->config->find_vqs(vsock->vdev, VSOCK_VQ_MAX,
+ vsock->vqs, callbacks, names);
+ if (ret < 0)
+ goto out;
+
+ virtio_vsock_update_guest_cid(vsock);
+
+ ret = vsock_core_init(&virtio_transport.transport);
+ if (ret < 0)
+ goto out_vqs;
+
+ vsock->rx_buf_nr = 0;
+ vsock->rx_buf_max_nr = 0;
+ atomic_set(&vsock->queued_replies, 0);
+
+ vdev->priv = vsock;
+ the_virtio_vsock = vsock;
+ mutex_init(&vsock->tx_lock);
+ mutex_init(&vsock->rx_lock);
+ mutex_init(&vsock->event_lock);
+ spin_lock_init(&vsock->send_pkt_list_lock);
+ INIT_LIST_HEAD(&vsock->send_pkt_list);
+ INIT_WORK(&vsock->rx_work, virtio_transport_rx_work);
+ INIT_WORK(&vsock->tx_work, virtio_transport_tx_work);
+ INIT_WORK(&vsock->event_work, virtio_transport_event_work);
+ INIT_WORK(&vsock->send_pkt_work, virtio_transport_send_pkt_work);
+
+ mutex_lock(&vsock->rx_lock);
+ virtio_vsock_rx_fill(vsock);
+ mutex_unlock(&vsock->rx_lock);
+
+ mutex_lock(&vsock->event_lock);
+ virtio_vsock_event_fill(vsock);
+ mutex_unlock(&vsock->event_lock);
+
+ mutex_unlock(&the_virtio_vsock_mutex);
+ return 0;
+
+out_vqs:
+ vsock->vdev->config->del_vqs(vsock->vdev);
+out:
+ kfree(vsock);
+ mutex_unlock(&the_virtio_vsock_mutex);
+ return ret;
+}
+
+static void virtio_vsock_remove(struct virtio_device *vdev)
+{
+ struct virtio_vsock *vsock = vdev->priv;
+ struct virtio_vsock_pkt *pkt;
+
+ flush_work(&vsock->rx_work);
+ flush_work(&vsock->tx_work);
+ flush_work(&vsock->event_work);
+ flush_work(&vsock->send_pkt_work);
+
+ vdev->config->reset(vdev);
+
+ mutex_lock(&vsock->rx_lock);
+ while ((pkt = virtqueue_detach_unused_buf(vsock->vqs[VSOCK_VQ_RX])))
+ virtio_transport_free_pkt(pkt);
+ mutex_unlock(&vsock->rx_lock);
+
+ mutex_lock(&vsock->tx_lock);
+ while ((pkt = virtqueue_detach_unused_buf(vsock->vqs[VSOCK_VQ_TX])))
+ virtio_transport_free_pkt(pkt);
+ mutex_unlock(&vsock->tx_lock);
+
+ spin_lock_bh(&vsock->send_pkt_list_lock);
+ while (!list_empty(&vsock->send_pkt_list)) {
+ pkt = list_first_entry(&vsock->send_pkt_list,
+ struct virtio_vsock_pkt, list);
+ list_del(&pkt->list);
+ virtio_transport_free_pkt(pkt);
+ }
+ spin_unlock_bh(&vsock->send_pkt_list_lock);
+
+ mutex_lock(&the_virtio_vsock_mutex);
+ the_virtio_vsock = NULL;
+ vsock_core_exit();
+ mutex_unlock(&the_virtio_vsock_mutex);
+
+ vdev->config->del_vqs(vdev);
+
+ kfree(vsock);
+}
+
+static struct virtio_device_id id_table[] = {
+ { VIRTIO_ID_VSOCK, VIRTIO_DEV_ANY_ID },
+ { 0 },
+};
+
+static unsigned int features[] = {
+};
+
+static struct virtio_driver virtio_vsock_driver = {
+ .feature_table = features,
+ .feature_table_size = ARRAY_SIZE(features),
+ .driver.name = KBUILD_MODNAME,
+ .driver.owner = THIS_MODULE,
+ .id_table = id_table,
+ .probe = virtio_vsock_probe,
+ .remove = virtio_vsock_remove,
+};
+
+static int __init virtio_vsock_init(void)
+{
+ int ret;
+
+ virtio_vsock_workqueue = alloc_workqueue("virtio_vsock", 0, 0);
+ if (!virtio_vsock_workqueue)
+ return -ENOMEM;
+ ret = register_virtio_driver(&virtio_vsock_driver);
+ if (ret)
+ destroy_workqueue(virtio_vsock_workqueue);
+ return ret;
+}
+
+static void __exit virtio_vsock_exit(void)
+{
+ unregister_virtio_driver(&virtio_vsock_driver);
+ destroy_workqueue(virtio_vsock_workqueue);
+}
+
+module_init(virtio_vsock_init);
+module_exit(virtio_vsock_exit);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Asias He");
+MODULE_DESCRIPTION("virtio transport for vsock");
+MODULE_DEVICE_TABLE(virtio, id_table);
--- /dev/null
+/*
+ * common code for virtio vsock
+ *
+ * Copyright (C) 2013-2015 Red Hat, Inc.
+ * Author: Asias He <asias@redhat.com>
+ * Stefan Hajnoczi <stefanha@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.
+ */
+#include <linux/spinlock.h>
+#include <linux/module.h>
+#include <linux/ctype.h>
+#include <linux/list.h>
+#include <linux/virtio.h>
+#include <linux/virtio_ids.h>
+#include <linux/virtio_config.h>
+#include <linux/virtio_vsock.h>
+
+#include <net/sock.h>
+#include <net/af_vsock.h>
+
+#define CREATE_TRACE_POINTS
+#include <trace/events/vsock_virtio_transport_common.h>
+
+/* How long to wait for graceful shutdown of a connection */
+#define VSOCK_CLOSE_TIMEOUT (8 * HZ)
+
+static const struct virtio_transport *virtio_transport_get_ops(void)
+{
+ const struct vsock_transport *t = vsock_core_get_transport();
+
+ return container_of(t, struct virtio_transport, transport);
+}
+
+struct virtio_vsock_pkt *
+virtio_transport_alloc_pkt(struct virtio_vsock_pkt_info *info,
+ size_t len,
+ u32 src_cid,
+ u32 src_port,
+ u32 dst_cid,
+ u32 dst_port)
+{
+ struct virtio_vsock_pkt *pkt;
+ int err;
+
+ pkt = kzalloc(sizeof(*pkt), GFP_KERNEL);
+ if (!pkt)
+ return NULL;
+
+ pkt->hdr.type = cpu_to_le16(info->type);
+ pkt->hdr.op = cpu_to_le16(info->op);
+ pkt->hdr.src_cid = cpu_to_le64(src_cid);
+ pkt->hdr.dst_cid = cpu_to_le64(dst_cid);
+ pkt->hdr.src_port = cpu_to_le32(src_port);
+ pkt->hdr.dst_port = cpu_to_le32(dst_port);
+ pkt->hdr.flags = cpu_to_le32(info->flags);
+ pkt->len = len;
+ pkt->hdr.len = cpu_to_le32(len);
+ pkt->reply = info->reply;
+
+ if (info->msg && len > 0) {
+ pkt->buf = kmalloc(len, GFP_KERNEL);
+ if (!pkt->buf)
+ goto out_pkt;
+ err = memcpy_from_msg(pkt->buf, info->msg, len);
+ if (err)
+ goto out;
+ }
+
+ trace_virtio_transport_alloc_pkt(src_cid, src_port,
+ dst_cid, dst_port,
+ len,
+ info->type,
+ info->op,
+ info->flags);
+
+ return pkt;
+
+out:
+ kfree(pkt->buf);
+out_pkt:
+ kfree(pkt);
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_alloc_pkt);
+
+static int virtio_transport_send_pkt_info(struct vsock_sock *vsk,
+ struct virtio_vsock_pkt_info *info)
+{
+ u32 src_cid, src_port, dst_cid, dst_port;
+ struct virtio_vsock_sock *vvs;
+ struct virtio_vsock_pkt *pkt;
+ u32 pkt_len = info->pkt_len;
+
+ src_cid = vm_sockets_get_local_cid();
+ src_port = vsk->local_addr.svm_port;
+ if (!info->remote_cid) {
+ dst_cid = vsk->remote_addr.svm_cid;
+ dst_port = vsk->remote_addr.svm_port;
+ } else {
+ dst_cid = info->remote_cid;
+ dst_port = info->remote_port;
+ }
+
+ vvs = vsk->trans;
+
+ /* we can send less than pkt_len bytes */
+ if (pkt_len > VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE)
+ pkt_len = VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE;
+
+ /* virtio_transport_get_credit might return less than pkt_len credit */
+ pkt_len = virtio_transport_get_credit(vvs, pkt_len);
+
+ /* Do not send zero length OP_RW pkt */
+ if (pkt_len == 0 && info->op == VIRTIO_VSOCK_OP_RW)
+ return pkt_len;
+
+ pkt = virtio_transport_alloc_pkt(info, pkt_len,
+ src_cid, src_port,
+ dst_cid, dst_port);
+ if (!pkt) {
+ virtio_transport_put_credit(vvs, pkt_len);
+ return -ENOMEM;
+ }
+
+ virtio_transport_inc_tx_pkt(vvs, pkt);
+
+ return virtio_transport_get_ops()->send_pkt(pkt);
+}
+
+static void virtio_transport_inc_rx_pkt(struct virtio_vsock_sock *vvs,
+ struct virtio_vsock_pkt *pkt)
+{
+ vvs->rx_bytes += pkt->len;
+}
+
+static void virtio_transport_dec_rx_pkt(struct virtio_vsock_sock *vvs,
+ struct virtio_vsock_pkt *pkt)
+{
+ vvs->rx_bytes -= pkt->len;
+ vvs->fwd_cnt += pkt->len;
+}
+
+void virtio_transport_inc_tx_pkt(struct virtio_vsock_sock *vvs, struct virtio_vsock_pkt *pkt)
+{
+ spin_lock_bh(&vvs->tx_lock);
+ pkt->hdr.fwd_cnt = cpu_to_le32(vvs->fwd_cnt);
+ pkt->hdr.buf_alloc = cpu_to_le32(vvs->buf_alloc);
+ spin_unlock_bh(&vvs->tx_lock);
+}
+EXPORT_SYMBOL_GPL(virtio_transport_inc_tx_pkt);
+
+u32 virtio_transport_get_credit(struct virtio_vsock_sock *vvs, u32 credit)
+{
+ u32 ret;
+
+ spin_lock_bh(&vvs->tx_lock);
+ ret = vvs->peer_buf_alloc - (vvs->tx_cnt - vvs->peer_fwd_cnt);
+ if (ret > credit)
+ ret = credit;
+ vvs->tx_cnt += ret;
+ spin_unlock_bh(&vvs->tx_lock);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_get_credit);
+
+void virtio_transport_put_credit(struct virtio_vsock_sock *vvs, u32 credit)
+{
+ spin_lock_bh(&vvs->tx_lock);
+ vvs->tx_cnt -= credit;
+ spin_unlock_bh(&vvs->tx_lock);
+}
+EXPORT_SYMBOL_GPL(virtio_transport_put_credit);
+
+static int virtio_transport_send_credit_update(struct vsock_sock *vsk,
+ int type,
+ struct virtio_vsock_hdr *hdr)
+{
+ struct virtio_vsock_pkt_info info = {
+ .op = VIRTIO_VSOCK_OP_CREDIT_UPDATE,
+ .type = type,
+ };
+
+ return virtio_transport_send_pkt_info(vsk, &info);
+}
+
+static ssize_t
+virtio_transport_stream_do_dequeue(struct vsock_sock *vsk,
+ struct msghdr *msg,
+ size_t len)
+{
+ struct virtio_vsock_sock *vvs = vsk->trans;
+ struct virtio_vsock_pkt *pkt;
+ size_t bytes, total = 0;
+ int err = -EFAULT;
+
+ spin_lock_bh(&vvs->rx_lock);
+ while (total < len && !list_empty(&vvs->rx_queue)) {
+ pkt = list_first_entry(&vvs->rx_queue,
+ struct virtio_vsock_pkt, list);
+
+ bytes = len - total;
+ if (bytes > pkt->len - pkt->off)
+ bytes = pkt->len - pkt->off;
+
+ /* sk_lock is held by caller so no one else can dequeue.
+ * Unlock rx_lock since memcpy_to_msg() may sleep.
+ */
+ spin_unlock_bh(&vvs->rx_lock);
+
+ err = memcpy_to_msg(msg, pkt->buf + pkt->off, bytes);
+ if (err)
+ goto out;
+
+ spin_lock_bh(&vvs->rx_lock);
+
+ total += bytes;
+ pkt->off += bytes;
+ if (pkt->off == pkt->len) {
+ virtio_transport_dec_rx_pkt(vvs, pkt);
+ list_del(&pkt->list);
+ virtio_transport_free_pkt(pkt);
+ }
+ }
+ spin_unlock_bh(&vvs->rx_lock);
+
+ /* Send a credit pkt to peer */
+ virtio_transport_send_credit_update(vsk, VIRTIO_VSOCK_TYPE_STREAM,
+ NULL);
+
+ return total;
+
+out:
+ if (total)
+ err = total;
+ return err;
+}
+
+ssize_t
+virtio_transport_stream_dequeue(struct vsock_sock *vsk,
+ struct msghdr *msg,
+ size_t len, int flags)
+{
+ if (flags & MSG_PEEK)
+ return -EOPNOTSUPP;
+
+ return virtio_transport_stream_do_dequeue(vsk, msg, len);
+}
+EXPORT_SYMBOL_GPL(virtio_transport_stream_dequeue);
+
+int
+virtio_transport_dgram_dequeue(struct vsock_sock *vsk,
+ struct msghdr *msg,
+ size_t len, int flags)
+{
+ return -EOPNOTSUPP;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_dgram_dequeue);
+
+s64 virtio_transport_stream_has_data(struct vsock_sock *vsk)
+{
+ struct virtio_vsock_sock *vvs = vsk->trans;
+ s64 bytes;
+
+ spin_lock_bh(&vvs->rx_lock);
+ bytes = vvs->rx_bytes;
+ spin_unlock_bh(&vvs->rx_lock);
+
+ return bytes;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_stream_has_data);
+
+static s64 virtio_transport_has_space(struct vsock_sock *vsk)
+{
+ struct virtio_vsock_sock *vvs = vsk->trans;
+ s64 bytes;
+
+ bytes = vvs->peer_buf_alloc - (vvs->tx_cnt - vvs->peer_fwd_cnt);
+ if (bytes < 0)
+ bytes = 0;
+
+ return bytes;
+}
+
+s64 virtio_transport_stream_has_space(struct vsock_sock *vsk)
+{
+ struct virtio_vsock_sock *vvs = vsk->trans;
+ s64 bytes;
+
+ spin_lock_bh(&vvs->tx_lock);
+ bytes = virtio_transport_has_space(vsk);
+ spin_unlock_bh(&vvs->tx_lock);
+
+ return bytes;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_stream_has_space);
+
+int virtio_transport_do_socket_init(struct vsock_sock *vsk,
+ struct vsock_sock *psk)
+{
+ struct virtio_vsock_sock *vvs;
+
+ vvs = kzalloc(sizeof(*vvs), GFP_KERNEL);
+ if (!vvs)
+ return -ENOMEM;
+
+ vsk->trans = vvs;
+ vvs->vsk = vsk;
+ if (psk) {
+ struct virtio_vsock_sock *ptrans = psk->trans;
+
+ vvs->buf_size = ptrans->buf_size;
+ vvs->buf_size_min = ptrans->buf_size_min;
+ vvs->buf_size_max = ptrans->buf_size_max;
+ vvs->peer_buf_alloc = ptrans->peer_buf_alloc;
+ } else {
+ vvs->buf_size = VIRTIO_VSOCK_DEFAULT_BUF_SIZE;
+ vvs->buf_size_min = VIRTIO_VSOCK_DEFAULT_MIN_BUF_SIZE;
+ vvs->buf_size_max = VIRTIO_VSOCK_DEFAULT_MAX_BUF_SIZE;
+ }
+
+ vvs->buf_alloc = vvs->buf_size;
+
+ spin_lock_init(&vvs->rx_lock);
+ spin_lock_init(&vvs->tx_lock);
+ INIT_LIST_HEAD(&vvs->rx_queue);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_do_socket_init);
+
+u64 virtio_transport_get_buffer_size(struct vsock_sock *vsk)
+{
+ struct virtio_vsock_sock *vvs = vsk->trans;
+
+ return vvs->buf_size;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_get_buffer_size);
+
+u64 virtio_transport_get_min_buffer_size(struct vsock_sock *vsk)
+{
+ struct virtio_vsock_sock *vvs = vsk->trans;
+
+ return vvs->buf_size_min;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_get_min_buffer_size);
+
+u64 virtio_transport_get_max_buffer_size(struct vsock_sock *vsk)
+{
+ struct virtio_vsock_sock *vvs = vsk->trans;
+
+ return vvs->buf_size_max;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_get_max_buffer_size);
+
+void virtio_transport_set_buffer_size(struct vsock_sock *vsk, u64 val)
+{
+ struct virtio_vsock_sock *vvs = vsk->trans;
+
+ if (val > VIRTIO_VSOCK_MAX_BUF_SIZE)
+ val = VIRTIO_VSOCK_MAX_BUF_SIZE;
+ if (val < vvs->buf_size_min)
+ vvs->buf_size_min = val;
+ if (val > vvs->buf_size_max)
+ vvs->buf_size_max = val;
+ vvs->buf_size = val;
+ vvs->buf_alloc = val;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_set_buffer_size);
+
+void virtio_transport_set_min_buffer_size(struct vsock_sock *vsk, u64 val)
+{
+ struct virtio_vsock_sock *vvs = vsk->trans;
+
+ if (val > VIRTIO_VSOCK_MAX_BUF_SIZE)
+ val = VIRTIO_VSOCK_MAX_BUF_SIZE;
+ if (val > vvs->buf_size)
+ vvs->buf_size = val;
+ vvs->buf_size_min = val;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_set_min_buffer_size);
+
+void virtio_transport_set_max_buffer_size(struct vsock_sock *vsk, u64 val)
+{
+ struct virtio_vsock_sock *vvs = vsk->trans;
+
+ if (val > VIRTIO_VSOCK_MAX_BUF_SIZE)
+ val = VIRTIO_VSOCK_MAX_BUF_SIZE;
+ if (val < vvs->buf_size)
+ vvs->buf_size = val;
+ vvs->buf_size_max = val;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_set_max_buffer_size);
+
+int
+virtio_transport_notify_poll_in(struct vsock_sock *vsk,
+ size_t target,
+ bool *data_ready_now)
+{
+ if (vsock_stream_has_data(vsk))
+ *data_ready_now = true;
+ else
+ *data_ready_now = false;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_notify_poll_in);
+
+int
+virtio_transport_notify_poll_out(struct vsock_sock *vsk,
+ size_t target,
+ bool *space_avail_now)
+{
+ s64 free_space;
+
+ free_space = vsock_stream_has_space(vsk);
+ if (free_space > 0)
+ *space_avail_now = true;
+ else if (free_space == 0)
+ *space_avail_now = false;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_notify_poll_out);
+
+int virtio_transport_notify_recv_init(struct vsock_sock *vsk,
+ size_t target, struct vsock_transport_recv_notify_data *data)
+{
+ return 0;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_init);
+
+int virtio_transport_notify_recv_pre_block(struct vsock_sock *vsk,
+ size_t target, struct vsock_transport_recv_notify_data *data)
+{
+ return 0;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_pre_block);
+
+int virtio_transport_notify_recv_pre_dequeue(struct vsock_sock *vsk,
+ size_t target, struct vsock_transport_recv_notify_data *data)
+{
+ return 0;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_pre_dequeue);
+
+int virtio_transport_notify_recv_post_dequeue(struct vsock_sock *vsk,
+ size_t target, ssize_t copied, bool data_read,
+ struct vsock_transport_recv_notify_data *data)
+{
+ return 0;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_post_dequeue);
+
+int virtio_transport_notify_send_init(struct vsock_sock *vsk,
+ struct vsock_transport_send_notify_data *data)
+{
+ return 0;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_notify_send_init);
+
+int virtio_transport_notify_send_pre_block(struct vsock_sock *vsk,
+ struct vsock_transport_send_notify_data *data)
+{
+ return 0;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_notify_send_pre_block);
+
+int virtio_transport_notify_send_pre_enqueue(struct vsock_sock *vsk,
+ struct vsock_transport_send_notify_data *data)
+{
+ return 0;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_notify_send_pre_enqueue);
+
+int virtio_transport_notify_send_post_enqueue(struct vsock_sock *vsk,
+ ssize_t written, struct vsock_transport_send_notify_data *data)
+{
+ return 0;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_notify_send_post_enqueue);
+
+u64 virtio_transport_stream_rcvhiwat(struct vsock_sock *vsk)
+{
+ struct virtio_vsock_sock *vvs = vsk->trans;
+
+ return vvs->buf_size;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_stream_rcvhiwat);
+
+bool virtio_transport_stream_is_active(struct vsock_sock *vsk)
+{
+ return true;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_stream_is_active);
+
+bool virtio_transport_stream_allow(u32 cid, u32 port)
+{
+ return true;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_stream_allow);
+
+int virtio_transport_dgram_bind(struct vsock_sock *vsk,
+ struct sockaddr_vm *addr)
+{
+ return -EOPNOTSUPP;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_dgram_bind);
+
+bool virtio_transport_dgram_allow(u32 cid, u32 port)
+{
+ return false;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_dgram_allow);
+
+int virtio_transport_connect(struct vsock_sock *vsk)
+{
+ struct virtio_vsock_pkt_info info = {
+ .op = VIRTIO_VSOCK_OP_REQUEST,
+ .type = VIRTIO_VSOCK_TYPE_STREAM,
+ };
+
+ return virtio_transport_send_pkt_info(vsk, &info);
+}
+EXPORT_SYMBOL_GPL(virtio_transport_connect);
+
+int virtio_transport_shutdown(struct vsock_sock *vsk, int mode)
+{
+ struct virtio_vsock_pkt_info info = {
+ .op = VIRTIO_VSOCK_OP_SHUTDOWN,
+ .type = VIRTIO_VSOCK_TYPE_STREAM,
+ .flags = (mode & RCV_SHUTDOWN ?
+ VIRTIO_VSOCK_SHUTDOWN_RCV : 0) |
+ (mode & SEND_SHUTDOWN ?
+ VIRTIO_VSOCK_SHUTDOWN_SEND : 0),
+ };
+
+ return virtio_transport_send_pkt_info(vsk, &info);
+}
+EXPORT_SYMBOL_GPL(virtio_transport_shutdown);
+
+int
+virtio_transport_dgram_enqueue(struct vsock_sock *vsk,
+ struct sockaddr_vm *remote_addr,
+ struct msghdr *msg,
+ size_t dgram_len)
+{
+ return -EOPNOTSUPP;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_dgram_enqueue);
+
+ssize_t
+virtio_transport_stream_enqueue(struct vsock_sock *vsk,
+ struct msghdr *msg,
+ size_t len)
+{
+ struct virtio_vsock_pkt_info info = {
+ .op = VIRTIO_VSOCK_OP_RW,
+ .type = VIRTIO_VSOCK_TYPE_STREAM,
+ .msg = msg,
+ .pkt_len = len,
+ };
+
+ return virtio_transport_send_pkt_info(vsk, &info);
+}
+EXPORT_SYMBOL_GPL(virtio_transport_stream_enqueue);
+
+void virtio_transport_destruct(struct vsock_sock *vsk)
+{
+ struct virtio_vsock_sock *vvs = vsk->trans;
+
+ kfree(vvs);
+}
+EXPORT_SYMBOL_GPL(virtio_transport_destruct);
+
+static int virtio_transport_reset(struct vsock_sock *vsk,
+ struct virtio_vsock_pkt *pkt)
+{
+ struct virtio_vsock_pkt_info info = {
+ .op = VIRTIO_VSOCK_OP_RST,
+ .type = VIRTIO_VSOCK_TYPE_STREAM,
+ .reply = !!pkt,
+ };
+
+ /* Send RST only if the original pkt is not a RST pkt */
+ if (pkt && le16_to_cpu(pkt->hdr.op) == VIRTIO_VSOCK_OP_RST)
+ return 0;
+
+ return virtio_transport_send_pkt_info(vsk, &info);
+}
+
+/* Normally packets are associated with a socket. There may be no socket if an
+ * attempt was made to connect to a socket that does not exist.
+ */
+static int virtio_transport_reset_no_sock(struct virtio_vsock_pkt *pkt)
+{
+ struct virtio_vsock_pkt_info info = {
+ .op = VIRTIO_VSOCK_OP_RST,
+ .type = le16_to_cpu(pkt->hdr.type),
+ .reply = true,
+ };
+
+ /* Send RST only if the original pkt is not a RST pkt */
+ if (le16_to_cpu(pkt->hdr.op) == VIRTIO_VSOCK_OP_RST)
+ return 0;
+
+ pkt = virtio_transport_alloc_pkt(&info, 0,
+ le32_to_cpu(pkt->hdr.dst_cid),
+ le32_to_cpu(pkt->hdr.dst_port),
+ le32_to_cpu(pkt->hdr.src_cid),
+ le32_to_cpu(pkt->hdr.src_port));
+ if (!pkt)
+ return -ENOMEM;
+
+ return virtio_transport_get_ops()->send_pkt(pkt);
+}
+
+static void virtio_transport_wait_close(struct sock *sk, long timeout)
+{
+ if (timeout) {
+ DEFINE_WAIT(wait);
+
+ do {
+ prepare_to_wait(sk_sleep(sk), &wait,
+ TASK_INTERRUPTIBLE);
+ if (sk_wait_event(sk, &timeout,
+ sock_flag(sk, SOCK_DONE)))
+ break;
+ } while (!signal_pending(current) && timeout);
+
+ finish_wait(sk_sleep(sk), &wait);
+ }
+}
+
+static void virtio_transport_do_close(struct vsock_sock *vsk,
+ bool cancel_timeout)
+{
+ struct sock *sk = sk_vsock(vsk);
+
+ sock_set_flag(sk, SOCK_DONE);
+ vsk->peer_shutdown = SHUTDOWN_MASK;
+ if (vsock_stream_has_data(vsk) <= 0)
+ sk->sk_state = SS_DISCONNECTING;
+ sk->sk_state_change(sk);
+
+ if (vsk->close_work_scheduled &&
+ (!cancel_timeout || cancel_delayed_work(&vsk->close_work))) {
+ vsk->close_work_scheduled = false;
+
+ vsock_remove_sock(vsk);
+
+ /* Release refcnt obtained when we scheduled the timeout */
+ sock_put(sk);
+ }
+}
+
+static void virtio_transport_close_timeout(struct work_struct *work)
+{
+ struct vsock_sock *vsk =
+ container_of(work, struct vsock_sock, close_work.work);
+ struct sock *sk = sk_vsock(vsk);
+
+ sock_hold(sk);
+ lock_sock(sk);
+
+ if (!sock_flag(sk, SOCK_DONE)) {
+ (void)virtio_transport_reset(vsk, NULL);
+
+ virtio_transport_do_close(vsk, false);
+ }
+
+ vsk->close_work_scheduled = false;
+
+ release_sock(sk);
+ sock_put(sk);
+}
+
+/* User context, vsk->sk is locked */
+static bool virtio_transport_close(struct vsock_sock *vsk)
+{
+ struct sock *sk = &vsk->sk;
+
+ if (!(sk->sk_state == SS_CONNECTED ||
+ sk->sk_state == SS_DISCONNECTING))
+ return true;
+
+ /* Already received SHUTDOWN from peer, reply with RST */
+ if ((vsk->peer_shutdown & SHUTDOWN_MASK) == SHUTDOWN_MASK) {
+ (void)virtio_transport_reset(vsk, NULL);
+ return true;
+ }
+
+ if ((sk->sk_shutdown & SHUTDOWN_MASK) != SHUTDOWN_MASK)
+ (void)virtio_transport_shutdown(vsk, SHUTDOWN_MASK);
+
+ if (sock_flag(sk, SOCK_LINGER) && !(current->flags & PF_EXITING))
+ virtio_transport_wait_close(sk, sk->sk_lingertime);
+
+ if (sock_flag(sk, SOCK_DONE)) {
+ return true;
+ }
+
+ sock_hold(sk);
+ INIT_DELAYED_WORK(&vsk->close_work,
+ virtio_transport_close_timeout);
+ vsk->close_work_scheduled = true;
+ schedule_delayed_work(&vsk->close_work, VSOCK_CLOSE_TIMEOUT);
+ return false;
+}
+
+void virtio_transport_release(struct vsock_sock *vsk)
+{
+ struct sock *sk = &vsk->sk;
+ bool remove_sock = true;
+
+ lock_sock(sk);
+ if (sk->sk_type == SOCK_STREAM)
+ remove_sock = virtio_transport_close(vsk);
+ release_sock(sk);
+
+ if (remove_sock)
+ vsock_remove_sock(vsk);
+}
+EXPORT_SYMBOL_GPL(virtio_transport_release);
+
+static int
+virtio_transport_recv_connecting(struct sock *sk,
+ struct virtio_vsock_pkt *pkt)
+{
+ struct vsock_sock *vsk = vsock_sk(sk);
+ int err;
+ int skerr;
+
+ switch (le16_to_cpu(pkt->hdr.op)) {
+ case VIRTIO_VSOCK_OP_RESPONSE:
+ sk->sk_state = SS_CONNECTED;
+ sk->sk_socket->state = SS_CONNECTED;
+ vsock_insert_connected(vsk);
+ sk->sk_state_change(sk);
+ break;
+ case VIRTIO_VSOCK_OP_INVALID:
+ break;
+ case VIRTIO_VSOCK_OP_RST:
+ skerr = ECONNRESET;
+ err = 0;
+ goto destroy;
+ default:
+ skerr = EPROTO;
+ err = -EINVAL;
+ goto destroy;
+ }
+ return 0;
+
+destroy:
+ virtio_transport_reset(vsk, pkt);
+ sk->sk_state = SS_UNCONNECTED;
+ sk->sk_err = skerr;
+ sk->sk_error_report(sk);
+ return err;
+}
+
+static int
+virtio_transport_recv_connected(struct sock *sk,
+ struct virtio_vsock_pkt *pkt)
+{
+ struct vsock_sock *vsk = vsock_sk(sk);
+ struct virtio_vsock_sock *vvs = vsk->trans;
+ int err = 0;
+
+ switch (le16_to_cpu(pkt->hdr.op)) {
+ case VIRTIO_VSOCK_OP_RW:
+ pkt->len = le32_to_cpu(pkt->hdr.len);
+ pkt->off = 0;
+
+ spin_lock_bh(&vvs->rx_lock);
+ virtio_transport_inc_rx_pkt(vvs, pkt);
+ list_add_tail(&pkt->list, &vvs->rx_queue);
+ spin_unlock_bh(&vvs->rx_lock);
+
+ sk->sk_data_ready(sk);
+ return err;
+ case VIRTIO_VSOCK_OP_CREDIT_UPDATE:
+ sk->sk_write_space(sk);
+ break;
+ case VIRTIO_VSOCK_OP_SHUTDOWN:
+ if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SHUTDOWN_RCV)
+ vsk->peer_shutdown |= RCV_SHUTDOWN;
+ if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SHUTDOWN_SEND)
+ vsk->peer_shutdown |= SEND_SHUTDOWN;
+ if (vsk->peer_shutdown == SHUTDOWN_MASK &&
+ vsock_stream_has_data(vsk) <= 0)
+ sk->sk_state = SS_DISCONNECTING;
+ if (le32_to_cpu(pkt->hdr.flags))
+ sk->sk_state_change(sk);
+ break;
+ case VIRTIO_VSOCK_OP_RST:
+ virtio_transport_do_close(vsk, true);
+ break;
+ default:
+ err = -EINVAL;
+ break;
+ }
+
+ virtio_transport_free_pkt(pkt);
+ return err;
+}
+
+static void
+virtio_transport_recv_disconnecting(struct sock *sk,
+ struct virtio_vsock_pkt *pkt)
+{
+ struct vsock_sock *vsk = vsock_sk(sk);
+
+ if (le16_to_cpu(pkt->hdr.op) == VIRTIO_VSOCK_OP_RST)
+ virtio_transport_do_close(vsk, true);
+}
+
+static int
+virtio_transport_send_response(struct vsock_sock *vsk,
+ struct virtio_vsock_pkt *pkt)
+{
+ struct virtio_vsock_pkt_info info = {
+ .op = VIRTIO_VSOCK_OP_RESPONSE,
+ .type = VIRTIO_VSOCK_TYPE_STREAM,
+ .remote_cid = le32_to_cpu(pkt->hdr.src_cid),
+ .remote_port = le32_to_cpu(pkt->hdr.src_port),
+ .reply = true,
+ };
+
+ return virtio_transport_send_pkt_info(vsk, &info);
+}
+
+/* Handle server socket */
+static int
+virtio_transport_recv_listen(struct sock *sk, struct virtio_vsock_pkt *pkt)
+{
+ struct vsock_sock *vsk = vsock_sk(sk);
+ struct vsock_sock *vchild;
+ struct sock *child;
+
+ if (le16_to_cpu(pkt->hdr.op) != VIRTIO_VSOCK_OP_REQUEST) {
+ virtio_transport_reset(vsk, pkt);
+ return -EINVAL;
+ }
+
+ if (sk_acceptq_is_full(sk)) {
+ virtio_transport_reset(vsk, pkt);
+ return -ENOMEM;
+ }
+
+ child = __vsock_create(sock_net(sk), NULL, sk, GFP_KERNEL,
+ sk->sk_type, 0);
+ if (!child) {
+ virtio_transport_reset(vsk, pkt);
+ return -ENOMEM;
+ }
+
+ sk->sk_ack_backlog++;
+
+ lock_sock_nested(child, SINGLE_DEPTH_NESTING);
+
+ child->sk_state = SS_CONNECTED;
+
+ vchild = vsock_sk(child);
+ vsock_addr_init(&vchild->local_addr, le32_to_cpu(pkt->hdr.dst_cid),
+ le32_to_cpu(pkt->hdr.dst_port));
+ vsock_addr_init(&vchild->remote_addr, le32_to_cpu(pkt->hdr.src_cid),
+ le32_to_cpu(pkt->hdr.src_port));
+
+ vsock_insert_connected(vchild);
+ vsock_enqueue_accept(sk, child);
+ virtio_transport_send_response(vchild, pkt);
+
+ release_sock(child);
+
+ sk->sk_data_ready(sk);
+ return 0;
+}
+
+static bool virtio_transport_space_update(struct sock *sk,
+ struct virtio_vsock_pkt *pkt)
+{
+ struct vsock_sock *vsk = vsock_sk(sk);
+ struct virtio_vsock_sock *vvs = vsk->trans;
+ bool space_available;
+
+ /* buf_alloc and fwd_cnt is always included in the hdr */
+ spin_lock_bh(&vvs->tx_lock);
+ vvs->peer_buf_alloc = le32_to_cpu(pkt->hdr.buf_alloc);
+ vvs->peer_fwd_cnt = le32_to_cpu(pkt->hdr.fwd_cnt);
+ space_available = virtio_transport_has_space(vsk);
+ spin_unlock_bh(&vvs->tx_lock);
+ return space_available;
+}
+
+/* We are under the virtio-vsock's vsock->rx_lock or vhost-vsock's vq->mutex
+ * lock.
+ */
+void virtio_transport_recv_pkt(struct virtio_vsock_pkt *pkt)
+{
+ struct sockaddr_vm src, dst;
+ struct vsock_sock *vsk;
+ struct sock *sk;
+ bool space_available;
+
+ vsock_addr_init(&src, le32_to_cpu(pkt->hdr.src_cid),
+ le32_to_cpu(pkt->hdr.src_port));
+ vsock_addr_init(&dst, le32_to_cpu(pkt->hdr.dst_cid),
+ le32_to_cpu(pkt->hdr.dst_port));
+
+ trace_virtio_transport_recv_pkt(src.svm_cid, src.svm_port,
+ dst.svm_cid, dst.svm_port,
+ le32_to_cpu(pkt->hdr.len),
+ le16_to_cpu(pkt->hdr.type),
+ le16_to_cpu(pkt->hdr.op),
+ le32_to_cpu(pkt->hdr.flags),
+ le32_to_cpu(pkt->hdr.buf_alloc),
+ le32_to_cpu(pkt->hdr.fwd_cnt));
+
+ if (le16_to_cpu(pkt->hdr.type) != VIRTIO_VSOCK_TYPE_STREAM) {
+ (void)virtio_transport_reset_no_sock(pkt);
+ goto free_pkt;
+ }
+
+ /* The socket must be in connected or bound table
+ * otherwise send reset back
+ */
+ sk = vsock_find_connected_socket(&src, &dst);
+ if (!sk) {
+ sk = vsock_find_bound_socket(&dst);
+ if (!sk) {
+ (void)virtio_transport_reset_no_sock(pkt);
+ goto free_pkt;
+ }
+ }
+
+ vsk = vsock_sk(sk);
+
+ space_available = virtio_transport_space_update(sk, pkt);
+
+ lock_sock(sk);
+
+ /* Update CID in case it has changed after a transport reset event */
+ vsk->local_addr.svm_cid = dst.svm_cid;
+
+ if (space_available)
+ sk->sk_write_space(sk);
+
+ switch (sk->sk_state) {
+ case VSOCK_SS_LISTEN:
+ virtio_transport_recv_listen(sk, pkt);
+ virtio_transport_free_pkt(pkt);
+ break;
+ case SS_CONNECTING:
+ virtio_transport_recv_connecting(sk, pkt);
+ virtio_transport_free_pkt(pkt);
+ break;
+ case SS_CONNECTED:
+ virtio_transport_recv_connected(sk, pkt);
+ break;
+ case SS_DISCONNECTING:
+ virtio_transport_recv_disconnecting(sk, pkt);
+ virtio_transport_free_pkt(pkt);
+ break;
+ default:
+ virtio_transport_free_pkt(pkt);
+ break;
+ }
+ release_sock(sk);
+
+ /* Release refcnt obtained when we fetched this socket out of the
+ * bound or connected list.
+ */
+ sock_put(sk);
+ return;
+
+free_pkt:
+ virtio_transport_free_pkt(pkt);
+}
+EXPORT_SYMBOL_GPL(virtio_transport_recv_pkt);
+
+void virtio_transport_free_pkt(struct virtio_vsock_pkt *pkt)
+{
+ kfree(pkt->buf);
+ kfree(pkt);
+}
+EXPORT_SYMBOL_GPL(virtio_transport_free_pkt);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Asias He");
+MODULE_DESCRIPTION("common code for virtio vsock");
static void vmci_transport_release(struct vsock_sock *vsk)
{
+ vsock_remove_sock(vsk);
+
if (!vmci_handle_is_invalid(vmci_trans(vsk)->dg_handle)) {
vmci_datagram_destroy_handle(vmci_trans(vsk)->dg_handle);
vmci_trans(vsk)->dg_handle = VMCI_INVALID_HANDLE;
projects / cascardo / linux.git / commitdiff