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From: Sean Christopherson <seanjc@google.com>
To: Sean Christopherson <seanjc@google.com>,
	Paolo Bonzini <pbonzini@redhat.com>
Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
	Like Xu <like.xu.linux@gmail.com>
Subject: [PATCH 0/3] KVM: x86: Intel PERF_CAPABILITIES fix and cleanups
Date: Wed, 27 Jul 2022 23:34:21 +0000	[thread overview]
Message-ID: <20220727233424.2968356-1-seanjc@google.com> (raw)

Fix a bug where KVM doesn't refresh the vPMU after userspace writes
PERF_CAPABILITIES, and then leverage that fix to avoiding checking
guest_cpuid_has(X86_FEATURE_PDCM) during VM-Enter, which is slow enough
that it shows up in perf traces[*].

[*] https://gist.github.com/avagin/f50a6d569440c9ae382281448c187f4e

Sean Christopherson (3):
  KVM: x86: Refresh PMU after writes to MSR_IA32_PERF_CAPABILITIES
  KVM: VMX: Use proper type-safe functions for vCPU => LBRs helpers
  KVM: VMX: Adjust number of LBR records for PERF_CAPABILITIES at
    refresh

 arch/x86/kvm/vmx/pmu_intel.c | 12 +++---------
 arch/x86/kvm/vmx/vmx.h       | 29 ++++++++++++++++++++---------
 arch/x86/kvm/x86.c           |  4 ++--
 3 files changed, 25 insertions(+), 20 deletions(-)


base-commit: 1a4d88a361af4f2e91861d632c6a1fe87a9665c2
-- 
2.37.1.359.gd136c6c3e2-goog


             reply	other threads:[~2022-07-27 23:34 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-07-27 23:34 Sean Christopherson [this message]
2022-07-27 23:34 ` [PATCH 1/3] KVM: x86: Refresh PMU after writes to MSR_IA32_PERF_CAPABILITIES Sean Christopherson
2022-07-28 12:02   ` Like Xu
2022-07-28 15:27     ` Sean Christopherson
2022-07-29  9:33       ` Like Xu
2022-07-29 13:51         ` Sean Christopherson
2022-08-03 12:29   ` Like Xu
2022-08-03 14:37     ` Sean Christopherson
2022-08-03 18:47       ` Sean Christopherson
2022-07-27 23:34 ` [PATCH 2/3] KVM: VMX: Use proper type-safe functions for vCPU => LBRs helpers Sean Christopherson
2022-07-29  8:39   ` Like Xu
2022-07-29 16:08     ` Sean Christopherson
2022-07-27 23:34 ` [PATCH 3/3] KVM: VMX: Adjust number of LBR records for PERF_CAPABILITIES at refresh Sean Christopherson
2022-07-29 10:10   ` Like Xu
2022-07-29 17:28     ` Sean Christopherson
2022-08-02 12:04   ` Like Xu
2022-08-02 14:57     ` Sean Christopherson
2022-08-10 13:24 ` [PATCH 0/3] KVM: x86: Intel PERF_CAPABILITIES fix and cleanups Paolo Bonzini

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