linux-kernel - Re: [PATCH v5 0/7] KVM: x86/mmu: Run TDP MMU NX huge page recovery under MMU read lock

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Message-ID: <175564472259.3066755.1319859221527663753.b4-ty@google.com>
Date: Tue, 19 Aug 2025 16:12:09 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>, 
	James Houghton <jthoughton@...gle.com>
Cc: Vipin Sharma <vipinsh@...gle.com>, David Matlack <dmatlack@...gle.com>, kvm@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 0/7] KVM: x86/mmu: Run TDP MMU NX huge page recovery
 under MMU read lock

On Mon, 07 Jul 2025 22:47:13 +0000, James Houghton wrote:
> I'm finishing off Vipin's NX huge page recovery optimization for the TDP
> MMU from last year. This is a respin on the series I sent a couple weeks
> ago, v4. Below is a mostly unchanged cover letter from v4.
> 
> NX huge page recovery can cause guest performance jitter, originally
> noticed with network tests in Windows guests. Please see Vipin's earlier
> performance results[1]. Below is some new data I have collected with the
> nx_huge_pages_perf_test that I've included with this series.
> 
> [...]

Applied 1-3 to kvm-x86 mmu, with the fixups described (hopefully I got 'em all)

Thanks!

[1/7] KVM: x86/mmu: Track TDP MMU NX huge pages separately
      https://github.com/kvm-x86/linux/commit/6777885605e1
[2/7] KVM: x86/mmu: Rename kvm_tdp_mmu_zap_sp() to better indicate its purpose
      https://github.com/kvm-x86/linux/commit/62105564226e
[3/7] KVM: x86/mmu: Recover TDP MMU NX huge pages using MMU read lock
      https://github.com/kvm-x86/linux/commit/a57750909580

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