KVM: arm/arm64: vgic-new: vgic_kvm_device: KVM_DEV_ARM_VGIC_GRP_ADDR

This patch implements the KVM_DEV_ARM_VGIC_GRP_ADDR group which
enables to set the base address of GIC regions as seen by the guest.

Signed-off-by: Eric Auger <eric.auger@linaro.org>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>

diff --git a/virt/kvm/arm/vgic/vgic-kvm-device.c b/virt/kvm/arm/vgic/vgic-kvm-device.c
index 082829a..a709097 100644 (file)
--- a/virt/kvm/arm/vgic/vgic-kvm-device.c
+++ b/virt/kvm/arm/vgic/vgic-kvm-device.c
@@ -112,6 +112,17 @@ static int vgic_set_common_attr(struct kvm_device *dev,
        int r;
 
        switch (attr->group) {
+       case KVM_DEV_ARM_VGIC_GRP_ADDR: {
+               u64 __user *uaddr = (u64 __user *)(long)attr->addr;
+               u64 addr;
+               unsigned long type = (unsigned long)attr->attr;
+
+               if (copy_from_user(&addr, uaddr, sizeof(addr)))
+                       return -EFAULT;
+
+               r = kvm_vgic_addr(dev->kvm, type, &addr, true);
+               return (r == -ENODEV) ? -ENXIO : r;
+       }
        case KVM_DEV_ARM_VGIC_GRP_NR_IRQS: {
                u32 __user *uaddr = (u32 __user *)(long)attr->addr;
                u32 val;
@@ -164,6 +175,19 @@ static int vgic_get_common_attr(struct kvm_device *dev,
        int r = -ENXIO;
 
        switch (attr->group) {
+       case KVM_DEV_ARM_VGIC_GRP_ADDR: {
+               u64 __user *uaddr = (u64 __user *)(long)attr->addr;
+               u64 addr;
+               unsigned long type = (unsigned long)attr->attr;
+
+               r = kvm_vgic_addr(dev->kvm, type, &addr, false);
+               if (r)
+                       return (r == -ENODEV) ? -ENXIO : r;
+
+               if (copy_to_user(uaddr, &addr, sizeof(addr)))
+                       return -EFAULT;
+               break;
+       }
        case KVM_DEV_ARM_VGIC_GRP_NR_IRQS: {
                u32 __user *uaddr = (u32 __user *)(long)attr->addr;
 
@@ -227,6 +251,13 @@ static int vgic_v2_has_attr(struct kvm_device *dev,
                            struct kvm_device_attr *attr)
 {
        switch (attr->group) {
+       case KVM_DEV_ARM_VGIC_GRP_ADDR:
+               switch (attr->attr) {
+               case KVM_VGIC_V2_ADDR_TYPE_DIST:
+               case KVM_VGIC_V2_ADDR_TYPE_CPU:
+                       return 0;
+               }
+               break;
        case KVM_DEV_ARM_VGIC_GRP_NR_IRQS:
                return 0;
        case KVM_DEV_ARM_VGIC_GRP_CTRL:
@@ -267,6 +298,13 @@ static int vgic_v3_has_attr(struct kvm_device *dev,
                            struct kvm_device_attr *attr)
 {
        switch (attr->group) {
+       case KVM_DEV_ARM_VGIC_GRP_ADDR:
+               switch (attr->attr) {
+               case KVM_VGIC_V3_ADDR_TYPE_DIST:
+               case KVM_VGIC_V3_ADDR_TYPE_REDIST:
+                       return 0;
+               }
+               break;
        case KVM_DEV_ARM_VGIC_GRP_NR_IRQS:
                return 0;
        case KVM_DEV_ARM_VGIC_GRP_CTRL: