KVM: x86/pmu: Implement Intel mediated PMU requirements and constraints

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Implement Intel PMU requirements and constraints for mediated PMU support.
Require host PMU version 4+ so that PERF_GLOBAL_STATUS_SET can be used to
precisely load the guest's status value into hardware, and require full-
width writes so that KVM can precisely load guest counter values.

Disable PEBS and LBRs if mediated PMU support is enabled, as they won't be
supported in the initial implementation.

Signed-off-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
Co-developed-by: Mingwei Zhang <mizhang@google.com>
Signed-off-by: Mingwei Zhang <mizhang@google.com>
[sean: split to separate patch, add full-width writes dependency]
Tested-by: Xudong Hao <xudong.hao@intel.com>
Tested-by: Manali Shukla <manali.shukla@amd.com>
Link: https://patch.msgid.link/20251206001720.468579-18-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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Dapeng Mi 2025-12-05 16:16:53 -08:00 • committed by Sean Christopherson

parent 3e51822b2f

commit bfee4f07d8

3 changed files with 21 additions and 2 deletions

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3

arch/x86/kvm/vmx/capabilities.h

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17

arch/x86/kvm/vmx/pmu_intel.c

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3

arch/x86/kvm/vmx/vmx.c

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