Messages in this thread | | | From | Jim Mattson <> | Date | Tue, 20 Sep 2022 14:36:34 -0700 | Subject | Re: [PATCH v2 0/3] KVM: EFER.LMSLE cleanup |
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On Tue, Sep 20, 2022 at 2:17 PM Borislav Petkov <bp@alien8.de> wrote: > > On Tue, Sep 20, 2022 at 01:59:19PM -0700, Jim Mattson wrote: > > Jim Mattson (3): > > Revert "KVM: SVM: Allow EFER.LMSLE to be set with nested svm" > > x86/cpufeatures: Introduce X86_FEATURE_NO_LMSLE > > KVM: SVM: Unconditionally enumerate EferLmsleUnsupported > > Why do you need those two if you revert the hack? After the revert, > anything that tries to set LMSLE should get a #GP anyway, no?
Reporting that CPUID bit gives us the right to raise #GP. AMD CPUs (going way back) that don't report EferLmsleUnsupported do not raise #GP.
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