KVM: x86/pmu: Constrain the num of guest counters with kvm_pmu_cap

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Cap the number of general purpose counters enumerated on AMD to what KVM
actually supports, i.e. don't allow userspace to coerce KVM into thinking
there are more counters than actually exist, e.g. by enumerating
X86_FEATURE_PERFCTR_CORE in guest CPUID when its not supported.

Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Like Xu <likexu@tencent.com>
[sean: massage changelog]
Link: https://lore.kernel.org/r/20230603011058.1038821-10-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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Like Xu 2023-06-02 18:10:55 -07:00 • committed by Sean Christopherson

parent d338d8789e

commit 1c2bf8a6b0

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arch/x86/kvm/svm/pmu.c

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