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From: Oliver Upton <oliver.upton@linux.dev>
To: Will Deacon <will@kernel.org>
Cc: kvmarm@lists.linux.dev, Sean Christopherson <seanjc@google.com>,
	Vincent Donnefort <vdonnefort@google.com>,
	Alexandru Elisei <alexandru.elisei@arm.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Philippe =?iso-8859-1?Q?Mathieu-Daud=E9?= <philmd@linaro.org>,
	James Morse <james.morse@arm.com>,
	Chao Peng <chao.p.peng@linux.intel.com>,
	Quentin Perret <qperret@google.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Mark Rutland <mark.rutland@arm.com>, Fuad Tabba <tabba@google.com>,
	Marc Zyngier <maz@kernel.org>, kernel-team@android.com,
	kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v5 04/25] KVM: arm64: Fix-up hyp stage-1 refcounts for
 all pages mapped at EL2
Message-ID: <Y1si442I6GsEmwz1@google.com>
References: <20221020133827.5541-1-will@kernel.org>
 <20221020133827.5541-5-will@kernel.org>
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On Thu, Oct 20, 2022 at 02:38:06PM +0100, Will Deacon wrote:
> From: Quentin Perret <qperret@google.com>
> 
> In order to allow unmapping arbitrary memory pages from the hypervisor
> stage-1 page-table, fix-up the initial refcount for pages that have been
> mapped before the 'vmemmap' array was up and running so that it
> accurately accounts for all existing hypervisor mappings.
> 
> This is achieved by traversing the entire hypervisor stage-1 page-table
> during initialisation of EL2 and updating the corresponding
> 'struct hyp_page' for each valid mapping.
> 
> Tested-by: Vincent Donnefort <vdonnefort@google.com>
> Signed-off-by: Quentin Perret <qperret@google.com>
> Signed-off-by: Will Deacon <will@kernel.org>

Reviewed-by: Oliver Upton <oliver.upton@linux.dev>

--
Thanks,
Oliver