KVM: x86/pmu: Don't tell userspace to save MSRs for non-existent fixed PMCs

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Limit the set of MSRs for fixed PMU counters based on the number of fixed
counters actually supported by the host so that userspace doesn't waste
time saving and restoring dummy values.

Signed-off-by: Like Xu <likexu@tencent.com>
[sean: split for !enable_pmu logic, drop min(), write changelog]
Link: https://lore.kernel.org/r/20230124234905.3774678-6-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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Like Xu 2023-01-24 23:49:04 +00:00 • committed by Sean Christopherson

parent c3531edc79

commit e33b6d79ac

2 changed files with 6 additions and 0 deletions

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arch/x86/include/asm/kvm_host.h

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arch/x86/kvm/x86.c

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