linux-kernel - [PATCH RESEND v2 0/8] x86/pmu: Corner cases fixes and optimization

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:   Tue, 23 Aug 2022 17:32:13 +0800
From:   Like Xu <like.xu.linux@...il.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     Jim Mattson <jmattson@...gle.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Subject: [PATCH RESEND v2 0/8] x86/pmu: Corner cases fixes and optimization

Good well-designed tests can help us find more bugs, especially when
the test steps differ from the Linux kernel behaviour in terms of the
timing of access to virtualized hw resources.

In this patch series, there are three small optimization (006/007/008),
one hardware surprise (001), and most of these fixes have stepped
on my little toes.

Please feel free to run tests, add more or share comments.

Previous:
https://lore.kernel.org/kvm/20220721103549.49543-1-likexu@tencent.com/
https://lore.kernel.org/kvm/20220803130124.72340-1-likexu@tencent.com/

V2 -> V2 RESEND Changelog:
- The "pebs_capable" fix has been merged into tip/perf/tree tree;
- Move the other two AMD vPMU optimization here;

Like Xu (8):
  perf/x86/core: Completely disable guest PEBS via guest's global_ctrl
  KVM: x86/pmu: Avoid setting BIT_ULL(-1) to pmu->host_cross_mapped_mask
  KVM: x86/pmu: Don't generate PEBS records for emulated instructions
  KVM: x86/pmu: Avoid using PEBS perf_events for normal counters
  KVM: x86/pmu: Defer reprogram_counter() to kvm_pmu_handle_event()
  KVM: x86/pmu: Defer counter emulated overflow via pmc->stale_counter
  KVM: x86/svm/pmu: Direct access pmu->gp_counter[] to implement
    amd_*_to_pmc()
  KVM: x86/svm/pmu: Rewrite get_gp_pmc_amd() for more counters
    scalability

 arch/x86/events/intel/core.c    |   3 +-
 arch/x86/include/asm/kvm_host.h |   6 +-
 arch/x86/kvm/pmu.c              |  47 ++++++++-----
 arch/x86/kvm/pmu.h              |   6 +-
 arch/x86/kvm/svm/pmu.c          | 116 +++++---------------------------
 arch/x86/kvm/vmx/pmu_intel.c    |  30 ++++-----
 6 files changed, 73 insertions(+), 135 deletions(-)

-- 
2.37.2