linux-kernel - Re: [PATCH v3 0/8] x86, KVM: Optimize SEV cache flushing

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Message-ID: <aG7g8vNejmxfftA-@google.com>
Date: Wed, 9 Jul 2025 14:36:50 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Borislav Petkov <bp@...en8.de>
Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org, 
	Paolo Bonzini <pbonzini@...hat.com>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
	Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, linux-kernel@...r.kernel.org, 
	kvm@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
	Kevin Loughlin <kevinloughlin@...gle.com>, Tom Lendacky <thomas.lendacky@....com>, 
	Kai Huang <kai.huang@...el.com>, Ingo Molnar <mingo@...nel.org>, 
	Zheyun Shen <szy0127@...u.edu.cn>, Mingwei Zhang <mizhang@...gle.com>, 
	Francesco Lavra <francescolavra.fl@...il.com>
Subject: Re: [PATCH v3 0/8] x86, KVM: Optimize SEV cache flushing

On Wed, Jul 09, 2025, Borislav Petkov wrote:
> On Wed, Jul 09, 2025 at 09:25:35AM -0700, Sean Christopherson wrote:
> > On Thu, May 22, 2025, Sean Christopherson wrote:
> > > This is the combination of Kevin's WBNOINVD series[1] with Zheyun's targeted
> > > flushing series[2].  The combined goal is to use WBNOINVD instead of WBINVD
> > > when doing cached maintenance to prevent data corruption due to C-bit aliasing,
> > > and to reduce the number of cache invalidations by only performing flushes on
> > > CPUs that have entered the relevant VM since the last cache flush.
> > > 
> > > All of the non-KVM patches are frontloaded and based on v6.15-rc7, so that
> > > they can go through the tip tree (in a stable branch, please :-) ).
> > 
> > Tip tree folks, any feedback/thoughts on this series (patches 1-4 in particular)?
> > It'd be nice to get this into 6.17, and I'd really like land it by 6.18 at the
> > latest.
> 
> I'll take a look tomorrow.
> 
> If I queue 1-4, would you like an immutable branch to merge for the other 4?

Yes please, thanks!