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

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Message-ID: <20250709185757.GDaG67tbGFYHUQxte2@fat_crate.local>
Date: Wed, 9 Jul 2025 20:57:57 +0200
From: Borislav Petkov <bp@...en8.de>
To: Sean Christopherson <seanjc@...gle.com>
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 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?

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette