linux-kernel - Re: [PATCH v2 0/7] Move pKVM ownership state to hyp

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Message-Id: <174593405817.3620453.10683944453931548390.b4-ty@kernel.org>
Date: Tue, 29 Apr 2025 14:41:08 +0100
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: Vincent Donnefort <vdonnefort@...gle.com>,
	Fuad Tabba <tabba@...gle.com>,
	linux-arm-kernel@...ts.infradead.org,
	kvmarm@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/7] Move pKVM ownership state to hyp_vmemmap

On Wed, 16 Apr 2025 15:26:40 +0000, Quentin Perret wrote:
> This series moves the hypervisor's ownership state to the hyp_vmemmap,
> as discussed in [1]. The two main benefits are:
> 
>  1. much cheaper hyp state lookups, since we can avoid the hyp stage-1
>     page-table walk;
> 
>  2. de-correlates the hyp state from the presence of a mapping in the
>     linear map range of the hypervisor; which enables a bunch of
>     clean-ups in the existing code and will simplify the introduction of
>     other features in the future (hyp tracing, ...)
> 
> [...]

Applied to next, thanks!

[1/7] KVM: arm64: Track SVE state in the hypervisor vcpu structure
      commit: 5db1bef933427aa467ad89c7b695a84a6b4afe16
[2/7] KVM: arm64: Fix pKVM page-tracking comments
      commit: ba637018ca67224fa21dc2212cb4457b357a5455
[3/7] KVM: arm64: Use 0b11 for encoding PKVM_NOPAGE
      commit: cd4b039165a5e709d0d599e207709d73141a8bed
[4/7] KVM: arm64: Introduce {get,set}_host_state() helpers
      commit: ba5b2e5b9dff5ba14940e1525f6e3a595f012466
[5/7] KVM: arm64: Move hyp state to hyp_vmemmap
      commit: 3390b3cbb613bc0822854f5754437cd1d1b3d5d0
[6/7] KVM: arm64: Defer EL2 stage-1 mapping on share
      commit: 48d848882395a6a42ff1bb685082c79791d4e753
[7/7] KVM: arm64: Unconditionally cross check hyp state
      commit: 43c475504a39e98f10f5e6ec4d9d9ed60672a753

Cheers,

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