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From 8225804259b165300d2d1cc1c4bdbad32fadf6da Mon Sep 17 00:00:00 2001
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From: Ladi Prosek <lprosek@redhat.com>
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Date: Tue, 10 Oct 2017 14:02:51 +0200
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Subject: [PATCH 13/69] i386/kvm: advertise Hyper-V frequency MSRs
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RH-Author: Ladi Prosek <lprosek@redhat.com>
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Message-id: <20171010140251.23801-5-lprosek@redhat.com>
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Patchwork-id: 77063
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O-Subject: [RHV7.5 qemu-kvm-rhev PATCH 4/4] i386/kvm: advertise Hyper-V frequency MSRs
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Bugzilla: 1500347
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: David Hildenbrand <david@redhat.com>
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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As of kernel commit eb82feea59d6 ("KVM: hyperv: support HV_X64_MSR_TSC_FREQUENCY
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and HV_X64_MSR_APIC_FREQUENCY"), KVM supports two new MSRs which are required
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for nested Hyper-V to read timestamps with RDTSC + TSC page.
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This commit makes QEMU advertise the MSRs with CPUID.40000003H:EAX[11] and
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CPUID.40000003H:EDX[8] as specified in the Hyper-V TLFS and experimentally
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verified on a Hyper-V host. The feature is enabled with the existing hv-time CPU
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flag, and only if the TSC frequency is stable across migrations and known.
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Signed-off-by: Ladi Prosek <lprosek@redhat.com>
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Reviewed-by: David Hildenbrand <david@redhat.com>
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Message-Id: <20170807085703.32267-5-lprosek@redhat.com>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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(cherry picked from commit d72bc7f6f8a397790abee4a25ba1b8c35dd2b841)
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Signed-off-by: Ladi Prosek <lprosek@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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target/i386/kvm.c | 12 +++++++++++-
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1 file changed, 11 insertions(+), 1 deletion(-)
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diff --git a/target/i386/kvm.c b/target/i386/kvm.c
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index 2dc01c9..739334a 100644
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--- a/target/i386/kvm.c
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+++ b/target/i386/kvm.c
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@@ -89,6 +89,7 @@ static bool has_msr_hv_vpindex;
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static bool has_msr_hv_runtime;
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static bool has_msr_hv_synic;
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static bool has_msr_hv_stimer;
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+static bool has_msr_hv_frequencies;
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static bool has_msr_xss;
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static bool has_msr_architectural_pmu;
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@@ -640,7 +641,13 @@ static int hyperv_handle_properties(CPUState *cs)
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if (cpu->hyperv_time) {
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env->features[FEAT_HYPERV_EAX] |= HV_X64_MSR_HYPERCALL_AVAILABLE;
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env->features[FEAT_HYPERV_EAX] |= HV_X64_MSR_TIME_REF_COUNT_AVAILABLE;
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- env->features[FEAT_HYPERV_EAX] |= 0x200;
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+ env->features[FEAT_HYPERV_EAX] |= HV_X64_MSR_REFERENCE_TSC_AVAILABLE;
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+
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+ if (has_msr_hv_frequencies && tsc_is_stable_and_known(env)) {
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+ env->features[FEAT_HYPERV_EAX] |= HV_X64_ACCESS_FREQUENCY_MSRS;
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+ env->features[FEAT_HYPERV_EDX] |=
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+ HV_FEATURE_FREQUENCY_MSRS_AVAILABLE;
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+ }
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}
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if (cpu->hyperv_crash && has_msr_hv_crash) {
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env->features[FEAT_HYPERV_EDX] |= HV_X64_GUEST_CRASH_MSR_AVAILABLE;
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@@ -1134,6 +1141,9 @@ static int kvm_get_supported_msrs(KVMState *s)
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case HV_X64_MSR_STIMER0_CONFIG:
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has_msr_hv_stimer = true;
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break;
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+ case HV_X64_MSR_TSC_FREQUENCY:
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+ has_msr_hv_frequencies = true;
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+ break;
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}
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}
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}
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--
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1.8.3.1
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