Re: [PATCH v14 09/13] KVM: x86: Report CET MSRs as to-be-saved if CET is supported

Yang Weijiang
2021-01-29T07:59:53Z

On Thu, Jan 28, 2021 at 06:46:37PM +0100, Paolo Bonzini wrote:
> On 06/11/20 02:16, Yang Weijiang wrote:
> > Report all CET MSRs, including the synthetic GUEST_SSP MSR, as
> > to-be-saved, e.g. for migration, if CET is supported by KVM.
> >
> > Co-developed-by: Sean Christopherson <sean.j.christopherson@intel.com>
> > Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
> > Signed-off-by: Yang Weijiang <weijiang.yang@intel.com>
> > ---
> > arch/x86/kvm/x86.c | 9 +++++++++
> > 1 file changed, 9 insertions(+)
> >
> > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> > index 751b62e871e5..d573cadf5baf 100644
> > --- a/arch/x86/kvm/x86.c
> > +++ b/arch/x86/kvm/x86.c
> > @@ -1248,6 +1248,8 @@ static const u32 msrs_to_save_all[] = {
> > MSR_ARCH_PERFMON_EVENTSEL0 + 16, MSR_ARCH_PERFMON_EVENTSEL0 + 17,
> > MSR_IA32_XSS,
> > + MSR_IA32_U_CET, MSR_IA32_S_CET, MSR_IA32_INT_SSP_TAB, MSR_KVM_GUEST_SSP,
> > + MSR_IA32_PL0_SSP, MSR_IA32_PL1_SSP, MSR_IA32_PL2_SSP, MSR_IA32_PL3_SSP,
> > };
> > static u32 msrs_to_save[ARRAY_SIZE(msrs_to_save_all)];
> > @@ -5761,6 +5763,13 @@ static void kvm_init_msr_list(void)
> > if (!supported_xss)
> > continue;
> > break;
> > + case MSR_IA32_U_CET:
> > + case MSR_IA32_S_CET:
> > + case MSR_IA32_INT_SSP_TAB:
> > + case MSR_IA32_PL0_SSP ... MSR_IA32_PL3_SSP:
> > + if (!kvm_cet_supported())
> > + continue;
> > + break;
> > default:
> > break;
> > }
> >
>
> Missing "case MSR_KVM_GUEST_SSP".
>
OK, will fix it in next version.
> Paolo