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| author | Ladi Prosek <lprosek@redhat.com> | 2017-08-07 10:57:03 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2017-09-19 14:09:33 +0200 |
| commit | d72bc7f6f8a397790abee4a25ba1b8c35dd2b841 (patch) | |
| tree | ae611f5b69b997a2f71f63e2b5c5fad9eba2ba7c /util/rcu.c | |
| parent | 4bb95b82df7ea4a1c7de15649dd16a70a19e6bab (diff) | |
i386/kvm: advertise Hyper-V frequency MSRs
As of kernel commit eb82feea59d6 ("KVM: hyperv: support HV_X64_MSR_TSC_FREQUENCY
and HV_X64_MSR_APIC_FREQUENCY"), KVM supports two new MSRs which are required
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-time CPU
flag, and only if the TSC frequency is stable across migrations and known.
Signed-off-by: Ladi Prosek <lprosek@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Message-Id: <20170807085703.32267-5-lprosek@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'util/rcu.c')
0 files changed, 0 insertions, 0 deletions