linux-kernel - Re: [PATCH v3 00/21] KVM: x86: Disallow writes to feature MSRs post-KVM

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Date:   Thu,  6 Apr 2023 19:02:29 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Xiaoyao Li <xiaoyao.li@...el.com>,
        Like Xu <like.xu.linux@...il.com>,
        Yu Zhang <yu.c.zhang@...ux.intel.com>
Subject: Re: [PATCH v3 00/21] KVM: x86: Disallow writes to feature MSRs post-KVM_RUN

On Fri, 10 Mar 2023 16:45:57 -0800, Sean Christopherson wrote:
> Give feature MSRs that same treatment as CPUID and disallow changing said
> MSRs after KVM_RUN.  Fix a tangentially related bug in the vPMU where KVM
> leaves the vLBRs enabled after userspace disables the guest's entire vPMU.
> 
> The bulk of this series is a rework of the vmx_pmu_caps_test, a.k.a.
> the PERF_CAPABILITIES selftests, to expand its coverage.  In addition to
> verifying that KVM rejects changes after KVM_RUN, verify other bits beyond
> full-width writes and the LBR format.
> 
> [...]

Applied to kvm-x86 pmu, thanks!

[01/21] KVM: x86: Rename kvm_init_msr_list() to clarify it inits multiple lists
        https://github.com/kvm-x86/linux/commit/b1932c5c19dd
[02/21] KVM: x86: Add a helper to query whether or not a vCPU has ever run
        https://github.com/kvm-x86/linux/commit/fb3146b4dc3b
[03/21] KVM: x86: Add macros to track first...last VMX feature MSRs
        https://github.com/kvm-x86/linux/commit/5757f5b95622
[04/21] KVM: x86: Generate set of VMX feature MSRs using first/last definitions
        https://github.com/kvm-x86/linux/commit/9eb6ba31db27
[05/21] KVM: selftests: Split PMU caps sub-tests to avoid writing MSR after KVM_RUN
        https://github.com/kvm-x86/linux/commit/e4d86fb910df
[06/21] KVM: x86: Disallow writes to immutable feature MSRs after KVM_RUN
        https://github.com/kvm-x86/linux/commit/0094f62c7eaa
[07/21] KVM: x86/pmu: WARN and bug the VM if PMU is refreshed after vCPU has run
        https://github.com/kvm-x86/linux/commit/3a6de51a437f
[08/21] KVM: x86/pmu: Zero out LBR capabilities during PMU refresh
        https://github.com/kvm-x86/linux/commit/957d0f70e97b
[09/21] KVM: selftests: Move 0/initial value PERF_CAPS checks to dedicated sub-test
        https://github.com/kvm-x86/linux/commit/710fb612672e
[10/21] KVM: selftests: Assert that full-width PMC writes are supported if PDCM=1
        https://github.com/kvm-x86/linux/commit/b1b705627cb3
[11/21] KVM: selftests: Print out failing MSR and value in vcpu_set_msr()
        https://github.com/kvm-x86/linux/commit/22234c2495ea
[12/21] KVM: selftests: Verify KVM preserves userspace writes to "durable" MSRs
        https://github.com/kvm-x86/linux/commit/f138258565d1
[13/21] KVM: selftests: Drop now-redundant checks on PERF_CAPABILITIES writes
        https://github.com/kvm-x86/linux/commit/69713940d2b4
[14/21] KVM: selftests: Test all fungible features in PERF_CAPABILITIES
        https://github.com/kvm-x86/linux/commit/37f4e79c43e5
[15/21] KVM: selftests: Test all immutable non-format bits in PERF_CAPABILITIES
        https://github.com/kvm-x86/linux/commit/a2a34d148e75
[16/21] KVM: selftests: Expand negative testing of guest writes to PERF_CAPABILITIES
        https://github.com/kvm-x86/linux/commit/baa36dac6ca8
[17/21] KVM: selftests: Test post-KVM_RUN writes to PERF_CAPABILITIES
        https://github.com/kvm-x86/linux/commit/81fd92411264
[18/21] KVM: selftests: Drop "all done!" printf() from PERF_CAPABILITIES test
        https://github.com/kvm-x86/linux/commit/bc7bb0082960
[19/21] KVM: selftests: Refactor LBR_FMT test to avoid use of separate macro
        https://github.com/kvm-x86/linux/commit/8ac2f774b9ea
[20/21] KVM: selftests: Add negative testcase for PEBS format in PERF_CAPABILITIES
        https://github.com/kvm-x86/linux/commit/8b95b4155523
[21/21] KVM: selftests: Verify LBRs are disabled if vPMU is disabled
        https://github.com/kvm-x86/linux/commit/d8f992e9fde8

--
https://github.com/kvm-x86/linux/tree/next
https://github.com/kvm-x86/linux/tree/fixes