KVM: s390: implement the RI support of guest

This patch adds runtime instrumentation support for KVM guest. We need to
setup a save area for the runtime instrumentation-controls control block(RICCB)
and implement the necessary interfaces to live migrate the guest settings.

We setup the sie control block in a way, that the runtime
instrumentation instructions of a guest are handled by hardware.

We also add a capability KVM_CAP_S390_RI to make this feature opt-in as
it needs migration support.

Signed-off-by: Fan Zhang <zhangfan@linux.vnet.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index c831441..df0acff 100644 (file)
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -217,7 +217,8 @@ struct kvm_s390_sie_block {
        __u64   pp;                     /* 0x01de */
        __u8    reserved1e6[2];         /* 0x01e6 */
        __u64   itdba;                  /* 0x01e8 */
-       __u8    reserved1f0[16];        /* 0x01f0 */
+       __u64   riccbd;                 /* 0x01f0 */
+       __u8    reserved1f8[8];         /* 0x01f8 */
 } __attribute__((packed));
 
 struct kvm_s390_itdb {

diff --git a/arch/s390/include/uapi/asm/kvm.h b/arch/s390/include/uapi/asm/kvm.h
index d2aea31..fe84bd5 100644 (file)
--- a/arch/s390/include/uapi/asm/kvm.h
+++ b/arch/s390/include/uapi/asm/kvm.h
@@ -153,6 +153,7 @@ struct kvm_guest_debug_arch {
 #define KVM_SYNC_ARCH0  (1UL << 4)
 #define KVM_SYNC_PFAULT (1UL << 5)
 #define KVM_SYNC_VRS    (1UL << 6)
+#define KVM_SYNC_RICCB  (1UL << 7)
 /* definition of registers in kvm_run */
 struct kvm_sync_regs {
        __u64 prefix;   /* prefix register */
@@ -170,6 +171,8 @@ struct kvm_sync_regs {
        __u64 vrs[32][2];       /* vector registers */
        __u8  reserved[512];    /* for future vector expansion */
        __u32 fpc;      /* only valid with vector registers */
+       __u8 padding[52];       /* riccb needs to be 64byte aligned */
+       __u8 riccb[64];         /* runtime instrumentation controls block */
 };
 
 #define KVM_REG_S390_TODPR     (KVM_REG_S390 | KVM_REG_SIZE_U32 | 0x1)

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 9f8eea3..5927c61 100644 (file)
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -258,6 +258,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
        case KVM_CAP_S390_VECTOR_REGISTERS:
                r = MACHINE_HAS_VX;
                break;
+       case KVM_CAP_S390_RI:
+               r = test_facility(64);
+               break;
        default:
                r = 0;
        }
@@ -358,6 +361,20 @@ static int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap)
                VM_EVENT(kvm, 3, "ENABLE: CAP_S390_VECTOR_REGISTERS %s",
                         r ? "(not available)" : "(success)");
                break;
+       case KVM_CAP_S390_RI:
+               r = -EINVAL;
+               mutex_lock(&kvm->lock);
+               if (atomic_read(&kvm->online_vcpus)) {
+                       r = -EBUSY;
+               } else if (test_facility(64)) {
+                       set_kvm_facility(kvm->arch.model.fac->mask, 64);
+                       set_kvm_facility(kvm->arch.model.fac->list, 64);
+                       r = 0;
+               }
+               mutex_unlock(&kvm->lock);
+               VM_EVENT(kvm, 3, "ENABLE: CAP_S390_RI %s",
+                        r ? "(not available)" : "(success)");
+               break;
        case KVM_CAP_S390_USER_STSI:
                VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_STSI");
                kvm->arch.user_stsi = 1;
@@ -1395,6 +1412,8 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
                                    KVM_SYNC_CRS |
                                    KVM_SYNC_ARCH0 |
                                    KVM_SYNC_PFAULT;
+       if (test_kvm_facility(vcpu->kvm, 64))
+               vcpu->run->kvm_valid_regs |= KVM_SYNC_RICCB;
        if (test_kvm_facility(vcpu->kvm, 129))
                vcpu->run->kvm_valid_regs |= KVM_SYNC_VRS;
 
@@ -1578,10 +1597,13 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
                vcpu->arch.sie_block->eca |= 1;
        if (sclp.has_sigpif)
                vcpu->arch.sie_block->eca |= 0x10000000U;
+       if (test_kvm_facility(vcpu->kvm, 64))
+               vcpu->arch.sie_block->ecb3 |= 0x01;
        if (test_kvm_facility(vcpu->kvm, 129)) {
                vcpu->arch.sie_block->eca |= 0x00020000;
                vcpu->arch.sie_block->ecd |= 0x20000000;
        }
+       vcpu->arch.sie_block->riccbd = (unsigned long) &vcpu->run->s.regs.riccb;
        vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
 
        if (vcpu->kvm->arch.use_cmma) {

diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 6e32f75..9da9051 100644 (file)
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -849,6 +849,7 @@ struct kvm_ppc_smmu_info {
 #define KVM_CAP_SPLIT_IRQCHIP 121
 #define KVM_CAP_IOEVENTFD_ANY_LENGTH 122
 #define KVM_CAP_HYPERV_SYNIC 123
+#define KVM_CAP_S390_RI 124
 
 #ifdef KVM_CAP_IRQ_ROUTING