linux-kernel - Re: [PATCH v2 00/21] KVM: x86: Add "governed" X86

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Date:   Thu,  3 Aug 2023 17:40:24 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Maxim Levitsky <mlevitsk@...hat.com>
Subject: Re: [PATCH v2 00/21] KVM: x86: Add "governed" X86_FEATURE framework

On Fri, 28 Jul 2023 18:15:47 -0700, Sean Christopherson wrote:
> Add a framework to manage and cache KVM-governed features, i.e. CPUID
> based features that require explicit KVM enabling and/or need to be
> queried semi-frequently by KVM.  The idea originally came up in the
> context of the architectural LBRs series as a way to avoid querying
> guest CPUID in hot paths without needing a dedicated flag, but as
> evidenced by the shortlog, the most common usage is to handle the ever-
> growing list of SVM features that are exposed to L1.
> 
> [...]

Applied to kvm-x86 misc.  I'm still hoping for reviews before sending this on
to Paolo, but I also want to get this into -next sooner than later.  And I
tried to grab everything else for "misc" ahead of time, so hopefully there won't
be much, if any, collateral damage if I need to unwind.

[01/21] KVM: nSVM: Check instead of asserting on nested TSC scaling support
        https://github.com/kvm-x86/linux/commit/06b2c8f7d994
[02/21] KVM: nSVM: Load L1's TSC multiplier based on L1 state, not L2 state
        https://github.com/kvm-x86/linux/commit/3b5ebb78fdc4
[03/21] KVM: nSVM: Use the "outer" helper for writing multiplier to MSR_AMD64_TSC_RATIO
        https://github.com/kvm-x86/linux/commit/b5b10353a0c6
[04/21] KVM: SVM: Clean up preemption toggling related to MSR_AMD64_TSC_RATIO
        https://github.com/kvm-x86/linux/commit/3e6e20a49690
[05/21] KVM: x86: Always write vCPU's current TSC offset/ratio in vendor hooks
        https://github.com/kvm-x86/linux/commit/c1a3910b30f6
[06/21] KVM: nSVM: Skip writes to MSR_AMD64_TSC_RATIO if guest state isn't loaded
        https://github.com/kvm-x86/linux/commit/923428d7f741
[07/21] KVM: x86: Add a framework for enabling KVM-governed x86 features
        https://github.com/kvm-x86/linux/commit/ed425263d977
[08/21] KVM: x86/mmu: Use KVM-governed feature framework to track "GBPAGES enabled"
        https://github.com/kvm-x86/linux/commit/f274417a0920
[09/21] KVM: VMX: Recompute "XSAVES enabled" only after CPUID update
        https://github.com/kvm-x86/linux/commit/73db29bfc576
[10/21] KVM: VMX: Check KVM CPU caps, not just VMX MSR support, for XSAVE enabling
        https://github.com/kvm-x86/linux/commit/82816e485b02
[11/21] KVM: VMX: Rename XSAVES control to follow KVM's preferred "ENABLE_XYZ"
        https://github.com/kvm-x86/linux/commit/080b5890f88e
[12/21] KVM: x86: Use KVM-governed feature framework to track "XSAVES enabled"
        https://github.com/kvm-x86/linux/commit/ae1f7788d4a3
[13/21] KVM: nVMX: Use KVM-governed feature framework to track "nested VMX enabled"
        https://github.com/kvm-x86/linux/commit/d60c21f44fe2
[14/21] KVM: nSVM: Use KVM-governed feature framework to track "NRIPS enabled"
        https://github.com/kvm-x86/linux/commit/f32e9ba4ff57
[15/21] KVM: nSVM: Use KVM-governed feature framework to track "TSC scaling enabled"
        https://github.com/kvm-x86/linux/commit/417293d8eebc
[16/21] KVM: nSVM: Use KVM-governed feature framework to track "vVM{SAVE,LOAD} enabled"
        https://github.com/kvm-x86/linux/commit/a179919b6b08
[17/21] KVM: nSVM: Use KVM-governed feature framework to track "LBRv enabled"
        https://github.com/kvm-x86/linux/commit/2a688180ae59
[18/21] KVM: nSVM: Use KVM-governed feature framework to track "Pause Filter enabled"
        https://github.com/kvm-x86/linux/commit/2b4a6cce48b6
[19/21] KVM: nSVM: Use KVM-governed feature framework to track "vGIF enabled"
        https://github.com/kvm-x86/linux/commit/994e74975227
[20/21] KVM: nSVM: Use KVM-governed feature framework to track "vNMI enabled"
        https://github.com/kvm-x86/linux/commit/17e2299ac6a6
[21/21] KVM: x86: Disallow guest CPUID lookups when IRQs are disabled
        https://github.com/kvm-x86/linux/commit/20b18b1dea4c

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