KVM: x86/pmu: Stop calling kvm_pmu_reset() at RESET (it's redundant)

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Drop kvm_vcpu_reset()'s call to kvm_pmu_reset(), the call is performed
only for RESET, which is really just the same thing as vCPU creation,
and kvm_arch_vcpu_create() *just* called kvm_pmu_init(), i.e. there can't
possibly be any work to do.

Unlike Intel, AMD's amd_pmu_refresh() does fill all_valid_pmc_idx even if
guest CPUID is empty, but everything that is at all dynamic is guaranteed
to be '0'/NULL, e.g. it should be impossible for KVM to have already
created a perf event.

Reviewed-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
Link: https://lore.kernel.org/r/20231103230541.352265-4-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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This commit is contained in:

Sean Christopherson 2023-11-03 16:05:38 -07:00

parent 1647b52757

commit f2f63f7ec6

3 changed files with 1 additions and 3 deletions

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arch/x86/kvm/pmu.c

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arch/x86/kvm/pmu.h

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arch/x86/kvm/x86.c

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