KVM: VMX: Snapshot LBR capabilities during module initialization

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Snapshot VMX's LBR capabilities once during module initialization instead
of calling into perf every time a vCPU reconfigures its vPMU.  This will
allow massaging the LBR capabilities, e.g. if the CPU doesn't support
callstacks, without having to remember to update multiple locations.

Opportunistically tag vmx_get_perf_capabilities() with __init, as it's
only called from vmx_set_cpu_caps().

Reviewed-by: Mingwei Zhang <mizhang@google.com>
Link: https://lore.kernel.org/r/20240307011344.835640-2-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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Sean Christopherson 2024-03-06 17:13:42 -08:00

parent 7f2817ef52

commit 447112d7ed

3 changed files with 8 additions and 5 deletions

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2

arch/x86/kvm/vmx/pmu_intel.c

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arch/x86/kvm/vmx/vmx.c

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2

arch/x86/kvm/vmx/vmx.h

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