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| author | Vitaly Kuznetsov <vkuznets@redhat.com> | 2018-03-01 15:15:12 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2018-03-16 22:01:31 +0100 |
| commit | a2e164e7f45ab21742b2e32c0195b699ae2ebfc0 (patch) | |
| tree | 64a0add3637d090b05997a6f1b8cf4f1c208f480 /arch/x86/kvm/hyperv.c | |
| parent | ddd6f0e94d3153951580d5b88b9d97c7e26a0e00 (diff) | |
| download | linux-a2e164e7f45ab21742b2e32c0195b699ae2ebfc0.tar.gz linux-a2e164e7f45ab21742b2e32c0195b699ae2ebfc0.tar.bz2 linux-a2e164e7f45ab21742b2e32c0195b699ae2ebfc0.zip | |
x86/kvm/hyper-v: add reenlightenment MSRs support
Nested Hyper-V/Windows guest running on top of KVM will use TSC page
clocksource in two cases:
- L0 exposes invariant TSC (CPUID.80000007H:EDX[8]).
- L0 provides Hyper-V Reenlightenment support (CPUID.40000003H:EAX[13]).
Exposing invariant TSC effectively blocks migration to hosts with different
TSC frequencies, providing reenlightenment support will be needed when we
start migrating nested workloads.
Implement rudimentary support for reenlightenment MSRs. For now, these are
just read/write MSRs with no effect.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Roman Kagan <rkagan@virtuozzo.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Diffstat (limited to 'arch/x86/kvm/hyperv.c')
| -rw-r--r-- | arch/x86/kvm/hyperv.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c index 53bd1913b6fd..2cffb94565f6 100644 --- a/arch/x86/kvm/hyperv.c +++ b/arch/x86/kvm/hyperv.c @@ -737,6 +737,9 @@ static bool kvm_hv_msr_partition_wide(u32 msr) case HV_X64_MSR_CRASH_CTL: case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4: case HV_X64_MSR_RESET: + case HV_X64_MSR_REENLIGHTENMENT_CONTROL: + case HV_X64_MSR_TSC_EMULATION_CONTROL: + case HV_X64_MSR_TSC_EMULATION_STATUS: r = true; break; } @@ -982,6 +985,15 @@ static int kvm_hv_set_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 data, kvm_make_request(KVM_REQ_HV_RESET, vcpu); } break; + case HV_X64_MSR_REENLIGHTENMENT_CONTROL: + hv->hv_reenlightenment_control = data; + break; + case HV_X64_MSR_TSC_EMULATION_CONTROL: + hv->hv_tsc_emulation_control = data; + break; + case HV_X64_MSR_TSC_EMULATION_STATUS: + hv->hv_tsc_emulation_status = data; + break; default: vcpu_unimpl(vcpu, "Hyper-V uhandled wrmsr: 0x%x data 0x%llx\n", msr, data); @@ -1106,6 +1118,15 @@ static int kvm_hv_get_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata) case HV_X64_MSR_RESET: data = 0; break; + case HV_X64_MSR_REENLIGHTENMENT_CONTROL: + data = hv->hv_reenlightenment_control; + break; + case HV_X64_MSR_TSC_EMULATION_CONTROL: + data = hv->hv_tsc_emulation_control; + break; + case HV_X64_MSR_TSC_EMULATION_STATUS: + data = hv->hv_tsc_emulation_status; + break; default: vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr); return 1; |