| From | Jim Mattson <> | Date | Tue, 4 May 2021 10:50:10 -0700 | Subject | Re: [PATCH 02/15] KVM: x86: Emulate RDPID only if RDTSCP is supported |
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On Tue, May 4, 2021 at 10:17 AM Sean Christopherson <seanjc@google.com> wrote: > > Do not advertise emulation support for RDPID if RDTSCP is unsupported. > RDPID emulation subtly relies on MSR_TSC_AUX to exist in hardware, as > both vmx_get_msr() and svm_get_msr() will return an error if the MSR is > unsupported, i.e. ctxt->ops->get_msr() will fail and the emulator will > inject a #UD. > > Note, RDPID emulation also relies on RDTSCP being enabled in the guest, > but this is a KVM bug and will eventually be fixed. > > Fixes: fb6d4d340e05 ("KVM: x86: emulate RDPID") > Cc: stable@vger.kernel.org > Signed-off-by: Sean Christopherson <seanjc@google.com> Reviewed by: Jim Mattson <jmattson@google.com>
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