Messages in this thread | | | From | Jim Mattson <> | Date | Tue, 4 May 2021 14:58:42 -0700 | Subject | Re: [PATCH 03/15] KVM: SVM: Inject #UD on RDTSCP when it should be disabled in the guest |
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On Tue, May 4, 2021 at 2:57 PM Paolo Bonzini <pbonzini@redhat.com> wrote: > > On 04/05/21 23:53, Sean Christopherson wrote: > >> Does the right thing happen here if the vCPU is in guest mode when > >> userspace decides to toggle the CPUID.80000001H:EDX.RDTSCP bit on or > >> off? > > I hate our terminology. By "guest mode", do you mean running the vCPU, or do > > you specifically mean running in L2? > > > > Guest mode should mean L2. > > (I wonder if we should have a capability that says "KVM_SET_CPUID2 can > only be called prior to KVM_RUN").
It would certainly make it easier to reason about potential security issues.
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