linux-kernel - Re: [PATCH v2 0/8] KVM: x86: Clean up MSR PAT handling

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Message-ID: <168565210307.661485.17815427865526599462.b4-ty@google.com>
Date:   Thu,  1 Jun 2023 18:21:49 -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,
        Kai Huang <kai.huang@...el.com>,
        Wenyao Hai <haiwenyao@...ontech.com>,
        Ke Guo <guoke@...ontech.com>
Subject: Re: [PATCH v2 0/8] KVM: x86: Clean up MSR PAT handling

On Thu, 11 May 2023 16:33:43 -0700, Sean Christopherson wrote:
> Clean up KVM's handling of MSR PAT.  The PAT is currently lumped in with
> MTRRs, and while the PAT does affect memtypes, it's not an MTRR and is
> exempted from KVM's kludgy attempts to play nice with UC memory for guests
> with passthrough devices that have non-coherent DMA (KVM does NOT set
> "ignore guest PAT" in this case, and so the guest PAT is virtualized by
> hardware, not emulated by KVM).
> 
> [...]

Applied to kvm-x86 misc, thanks!

[1/8] KVM: VMX: Open code writing vCPU's PAT in VMX's MSR handler
      https://github.com/kvm-x86/linux/commit/a33ba1bf0dc6
[2/8] KVM: SVM: Use kvm_pat_valid() directly instead of kvm_mtrr_valid()
      https://github.com/kvm-x86/linux/commit/7aeae027611f
[3/8] KVM: x86: Add helper to query if variable MTRR MSR is base (versus mask)
      https://github.com/kvm-x86/linux/commit/ebda79e50577
[4/8] KVM: x86: Add helper to get variable MTRR range from MSR index
      https://github.com/kvm-x86/linux/commit/9ae38b4fb135
[5/8] KVM: x86: Use MTRR macros to define possible MTRR MSR ranges
      https://github.com/kvm-x86/linux/commit/34a83deac31c
[6/8] KVM: x86: Move PAT MSR handling out of mtrr.c
      https://github.com/kvm-x86/linux/commit/bc7fe2f0b751
[7/8] KVM: x86: Make kvm_mtrr_valid() static now that there are no external users
      https://github.com/kvm-x86/linux/commit/3a5f49078eb5
[8/8] KVM: x86: Move common handling of PAT MSR writes to kvm_set_msr_common()
      https://github.com/kvm-x86/linux/commit/dee321977a23

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