linux-kernel - Re: [PATCH 0/2] Fixes for pKVM NP-guest support

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Message-Id: <173909647948.1598393.13009014212384755720.b4-ty@kernel.org>
Date: Sun,  9 Feb 2025 10:21:33 +0000
From: Marc Zyngier <maz@...nel.org>
To: Oliver Upton <oliver.upton@...ux.dev>,
	Joey Gouly <joey.gouly@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Zenghui Yu <yuzenghui@...wei.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Quentin Perret <qperret@...gle.com>
Cc: Fuad Tabba <tabba@...gle.com>,
	Vincent Donnefort <vdonnefort@...gle.com>,
	linux-arm-kernel@...ts.infradead.org,
	kvmarm@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] Fixes for pKVM NP-guest support

On Fri, 07 Feb 2025 14:54:36 +0000, Quentin Perret wrote:
> Here are two patches to deal with a race between the handling of
> permission faults and MMU notifiers with pKVM that I found by
> inspection. Specifically, pKVM gets thoroughly confused when it doesn't
> find a page mapped in its relax_perm path, while standard KVM deals
> with that trivially thanks to the -EAGAIN special case in
> user_mem_abort(). The second patch addresses the problem by simplifying
> the implementation of multiple pKVM hypercalls, which also has the nice
> side effect of improving locking by not taking the global host stage-2
> lock as much.
> 
> [...]

Applied to fixes, thanks!

[1/2] KVM: arm64: Improve error handling from check_host_shared_guest()
      commit: c53fbdb60fb61fd6bda2bc0dc89837966625c5dc
[2/2] KVM: arm64: Simplify np-guest hypercalls
      commit: eabc7aaef7a553b64bf6e631ce04526af6c8d104

Cheers,

	M.
-- 
Without deviation from the norm, progress is not possible.