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X-Received-From: 2a00:1450:400c:c09::241 Subject: [Qemu-devel] [PULL 21/50] i386/kvm: advertise Hyper-V frequency MSRs X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Ladi Prosek Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZohoMail: RDKM_2 RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: Ladi Prosek As of kernel commit eb82feea59d6 ("KVM: hyperv: support HV_X64_MSR_TSC_FREQ= UENCY and HV_X64_MSR_APIC_FREQUENCY"), KVM supports two new MSRs which are requir= ed for nested Hyper-V to read timestamps with RDTSC + TSC page. This commit makes QEMU advertise the MSRs with CPUID.40000003H:EAX[11] and CPUID.40000003H:EDX[8] as specified in the Hyper-V TLFS and experimentally verified on a Hyper-V host. The feature is enabled with the existing hv-tim= e CPU flag, and only if the TSC frequency is stable across migrations and known. Signed-off-by: Ladi Prosek Reviewed-by: David Hildenbrand Message-Id: <20170807085703.32267-5-lprosek@redhat.com> Signed-off-by: Paolo Bonzini --- target/i386/kvm.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/target/i386/kvm.c b/target/i386/kvm.c index 2dc01c9..739334a 100644 --- a/target/i386/kvm.c +++ b/target/i386/kvm.c @@ -89,6 +89,7 @@ static bool has_msr_hv_vpindex; static bool has_msr_hv_runtime; static bool has_msr_hv_synic; static bool has_msr_hv_stimer; +static bool has_msr_hv_frequencies; static bool has_msr_xss; =20 static bool has_msr_architectural_pmu; @@ -640,7 +641,13 @@ static int hyperv_handle_properties(CPUState *cs) if (cpu->hyperv_time) { env->features[FEAT_HYPERV_EAX] |=3D HV_X64_MSR_HYPERCALL_AVAILABLE; env->features[FEAT_HYPERV_EAX] |=3D HV_X64_MSR_TIME_REF_COUNT_AVAI= LABLE; - env->features[FEAT_HYPERV_EAX] |=3D 0x200; + env->features[FEAT_HYPERV_EAX] |=3D HV_X64_MSR_REFERENCE_TSC_AVAIL= ABLE; + + if (has_msr_hv_frequencies && tsc_is_stable_and_known(env)) { + env->features[FEAT_HYPERV_EAX] |=3D HV_X64_ACCESS_FREQUENCY_MS= RS; + env->features[FEAT_HYPERV_EDX] |=3D + HV_FEATURE_FREQUENCY_MSRS_AVAILABLE; + } } if (cpu->hyperv_crash && has_msr_hv_crash) { env->features[FEAT_HYPERV_EDX] |=3D HV_X64_GUEST_CRASH_MSR_AVAILAB= LE; @@ -1134,6 +1141,9 @@ static int kvm_get_supported_msrs(KVMState *s) case HV_X64_MSR_STIMER0_CONFIG: has_msr_hv_stimer =3D true; break; + case HV_X64_MSR_TSC_FREQUENCY: + has_msr_hv_frequencies =3D true; + break; } } } --=20 1.8.3.1