KVM: x86/pmu: Reject userspace attempts to set reserved GLOBAL_STATUS bits

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Reject userspace writes to MSR_CORE_PERF_GLOBAL_STATUS that attempt to set
reserved bits.  Allowing userspace to stuff reserved bits doesn't harm KVM
itself, but it's architecturally wrong and the guest can't clear the
unsupported bits, e.g. makes the guest's PMI handler very confused.

Signed-off-by: Like Xu <likexu@tencent.com>
[sean: rewrite changelog to avoid use of #GP, rebase on name change]
Link: https://lore.kernel.org/r/20230603011058.1038821-4-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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Like Xu 2023-06-02 18:10:49 -07:00 • committed by Sean Christopherson

parent 8de18543df

commit 30dab5c0b6

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arch/x86/kvm/vmx/pmu_intel.c

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