linux-kernel - Re: [PATCH] KVM: SVM: Remove redundant TLB flush on guest CR4.PGE change

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Message-ID: <173457546228.3295022.11879746560606212523.b4-ty@google.com>
Date: Wed, 18 Dec 2024 18:40:56 -0800
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
Subject: Re: [PATCH] KVM: SVM: Remove redundant TLB flush on guest CR4.PGE change

On Wed, 27 Nov 2024 15:53:12 -0800, Sean Christopherson wrote:
> Drop SVM's direct TLB flush when CR4.PGE is toggled and NPT is enabled, as
> KVM already guarantees TLBs are flushed appropriately.
> 
> For the call from cr_trap(), kvm_post_set_cr4() requests TLB_FLUSH_GUEST
> (which is a superset of TLB_FLUSH_CURRENT) when CR4.PGE is toggled,
> regardless of whether or not KVM is using TDP.
> 
> [...]

Applied to kvm-x86 svm, thanks!

[1/1] KVM: SVM: Remove redundant TLB flush on guest CR4.PGE change
      https://github.com/kvm-x86/linux/commit/036e78a942b4

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