KVM: x86: nSVM: implement nested TSC scaling
This was tested by booting a nested guest with TSC=1Ghz,
observing the clocks, and doing about 100 cycles of migration.
Note that qemu patch is needed to support migration because
of a new MSR that needs to be placed in the migration state.
The patch will be sent to the qemu mailing list soon.
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20210914154825.104886-14-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index ee1b9e1..c028ff7 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1361,6 +1361,7 @@ static const u32 emulated_msrs_all[] = {
MSR_PLATFORM_INFO,
MSR_MISC_FEATURES_ENABLES,
MSR_AMD64_VIRT_SPEC_CTRL,
+ MSR_AMD64_TSC_RATIO,
MSR_IA32_POWER_CTL,
MSR_IA32_UCODE_REV,
