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| author | Sean Christopherson <seanjc@google.com> | 2025-06-11 15:45:23 -0700 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2025-06-23 09:50:17 -0700 |
| commit | 52d826c9e54cc6b4f0107720dd1f254944f6e727 (patch) | |
| tree | 34fa2685c8ca7a60d2891bf8638ce2456c4a226f /tools/perf/scripts/python/gecko.py | |
| parent | 6737557442e5d21fef5c613c3079d26a4a4b0744 (diff) | |
KVM: SVM: Add a comment to explain why avic_vcpu_blocking() ignores IRQ blocking
Add a comment to explain why KVM clears IsRunning when putting a vCPU,
even though leaving IsRunning=1 would be ok from a functional perspective.
Per Maxim's experiments, a misbehaving VM could spam the AVIC doorbell so
fast as to induce a 50%+ loss in performance.
Link: https://lore.kernel.org/all/8d7e0d0391df4efc7cb28557297eb2ec9904f1e5.camel@redhat.com
Cc: Maxim Levitsky <mlevitsk@redhat.com>
Acked-by: Naveen N Rao (AMD) <naveen@kernel.org>
Link: https://lore.kernel.org/r/20250611224604.313496-22-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'tools/perf/scripts/python/gecko.py')
0 files changed, 0 insertions, 0 deletions