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>
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4 changed files with 28 additions and 1 deletions
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@ -217,7 +217,8 @@ struct kvm_s390_sie_block {
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__u64 pp; /* 0x01de */
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__u8 reserved1e6[2]; /* 0x01e6 */
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__u64 itdba; /* 0x01e8 */
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__u8 reserved1f0[16]; /* 0x01f0 */
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__u64 riccbd; /* 0x01f0 */
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__u8 reserved1f8[8]; /* 0x01f8 */
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} __attribute__((packed));
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struct kvm_s390_itdb {
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@ -153,6 +153,7 @@ struct kvm_guest_debug_arch {
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#define KVM_SYNC_ARCH0 (1UL << 4)
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#define KVM_SYNC_PFAULT (1UL << 5)
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#define KVM_SYNC_VRS (1UL << 6)
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#define KVM_SYNC_RICCB (1UL << 7)
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/* definition of registers in kvm_run */
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struct kvm_sync_regs {
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__u64 prefix; /* prefix register */
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@ -170,6 +171,8 @@ struct kvm_sync_regs {
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__u64 vrs[32][2]; /* vector registers */
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__u8 reserved[512]; /* for future vector expansion */
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__u32 fpc; /* only valid with vector registers */
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__u8 padding[52]; /* riccb needs to be 64byte aligned */
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__u8 riccb[64]; /* runtime instrumentation controls block */
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};
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#define KVM_REG_S390_TODPR (KVM_REG_S390 | KVM_REG_SIZE_U32 | 0x1)
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@ -258,6 +258,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
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case KVM_CAP_S390_VECTOR_REGISTERS:
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r = MACHINE_HAS_VX;
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break;
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case KVM_CAP_S390_RI:
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r = test_facility(64);
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break;
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default:
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r = 0;
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}
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@ -358,6 +361,20 @@ static int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap)
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VM_EVENT(kvm, 3, "ENABLE: CAP_S390_VECTOR_REGISTERS %s",
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r ? "(not available)" : "(success)");
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break;
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case KVM_CAP_S390_RI:
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r = -EINVAL;
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mutex_lock(&kvm->lock);
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if (atomic_read(&kvm->online_vcpus)) {
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r = -EBUSY;
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} else if (test_facility(64)) {
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set_kvm_facility(kvm->arch.model.fac->mask, 64);
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set_kvm_facility(kvm->arch.model.fac->list, 64);
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r = 0;
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}
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mutex_unlock(&kvm->lock);
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VM_EVENT(kvm, 3, "ENABLE: CAP_S390_RI %s",
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r ? "(not available)" : "(success)");
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break;
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case KVM_CAP_S390_USER_STSI:
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VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_STSI");
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kvm->arch.user_stsi = 1;
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@ -1395,6 +1412,8 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
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KVM_SYNC_CRS |
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KVM_SYNC_ARCH0 |
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KVM_SYNC_PFAULT;
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if (test_kvm_facility(vcpu->kvm, 64))
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vcpu->run->kvm_valid_regs |= KVM_SYNC_RICCB;
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if (test_kvm_facility(vcpu->kvm, 129))
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vcpu->run->kvm_valid_regs |= KVM_SYNC_VRS;
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@ -1578,10 +1597,13 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
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vcpu->arch.sie_block->eca |= 1;
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if (sclp.has_sigpif)
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vcpu->arch.sie_block->eca |= 0x10000000U;
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if (test_kvm_facility(vcpu->kvm, 64))
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vcpu->arch.sie_block->ecb3 |= 0x01;
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if (test_kvm_facility(vcpu->kvm, 129)) {
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vcpu->arch.sie_block->eca |= 0x00020000;
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vcpu->arch.sie_block->ecd |= 0x20000000;
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}
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vcpu->arch.sie_block->riccbd = (unsigned long) &vcpu->run->s.regs.riccb;
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vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
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if (vcpu->kvm->arch.use_cmma) {
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@ -849,6 +849,7 @@ struct kvm_ppc_smmu_info {
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#define KVM_CAP_SPLIT_IRQCHIP 121
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#define KVM_CAP_IOEVENTFD_ANY_LENGTH 122
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#define KVM_CAP_HYPERV_SYNIC 123
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#define KVM_CAP_S390_RI 124
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#ifdef KVM_CAP_IRQ_ROUTING
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