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| author | Fan Zhang | 2016-01-07 11:24:29 +0100 |
|---|---|---|
| committer | Christian Borntraeger | 2016-01-07 14:48:26 +0100 |
| commit | c6e5f166373a20a433c38a34bd16f2b62bd0864c (patch) | |
| tree | 7e444674777fad893eb4ab353267c397c44db57c /arch/s390/kvm/kvm-s390.c | |
| parent | kvm/s390: drop unpaired smp_mb (diff) | |
| download | kernel-qcow2-linux-c6e5f166373a20a433c38a34bd16f2b62bd0864c.tar.gz kernel-qcow2-linux-c6e5f166373a20a433c38a34bd16f2b62bd0864c.tar.xz kernel-qcow2-linux-c6e5f166373a20a433c38a34bd16f2b62bd0864c.zip | |
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>
Diffstat (limited to 'arch/s390/kvm/kvm-s390.c')
| -rw-r--r-- | arch/s390/kvm/kvm-s390.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 9f8eea3e2987..5927c61d322a 100644 --- 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) { |