Messages in this thread | | | From | Reiji Watanabe <> | Date | Fri, 30 Apr 2021 18:50:26 -0700 | Subject | Re: [PATCH v4 1/1] x86/cpufeatures: Implement Predictive Store Forwarding control. |
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> > Considering KVM/virtualization for a CPU that has X86_FEATURE_PSFD > > but no other existing feature with MSR_IA32_SPEC_CTRL, if a host > > doesn't enable PSFD with the new parameter, the host doesn't have > > X86_FEATURE_MSR_SPEC_CTRL. Then, it would be a problem if its > > guests want to use PSFD looking at x86_virt_spec_ctrl(). > > (I'm not sure how you will change your previous KVM patch though) > > Reiji, you are correct that X86_FEATURE_MSR_SPEC_CTRL should be enabled so KVM guests can use PSFD > even if host does not use it. > I have this change in my KVM patch.
Thank you for the response. Yes, that sounds good.
Thanks, Reiji
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