KVM: x86/pmu: WARN and bug the VM if PMU is refreshed after vCPU has run

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Now that KVM disallows changing feature MSRs, i.e. PERF_CAPABILITIES,
after running a vCPU, WARN and bug the VM if the PMU is refreshed after
the vCPU has run.

Note, KVM has disallowed CPUID updates after running a vCPU since commit
feb627e8d6 ("KVM: x86: Forbid KVM_SET_CPUID{,2} after KVM_RUN"), i.e.
PERF_CAPABILITIES was the only remaining way to trigger a PMU refresh
after KVM_RUN.

Cc: Like Xu <like.xu.linux@gmail.com>
Link: https://lore.kernel.org/r/20230311004618.920745-8-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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This commit is contained in:

Sean Christopherson 2023-03-10 16:46:04 -08:00

parent 0094f62c7e

commit 3a6de51a43

2 changed files with 12 additions and 1 deletions

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3

arch/x86/kvm/pmu.c

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10

arch/x86/kvm/x86.c

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