linux-kernel - Re: [PATCH v5 16/19] arm64: Enable memory encrypt for Realms

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Message-ID: <Zsxc-wqGaQLpyO-W@arm.com>
Date: Mon, 26 Aug 2024 13:46:19 +0300
From: Catalin Marinas <catalin.marinas@....com>
To: Steven Price <steven.price@....com>
Cc: kvm@...r.kernel.org, kvmarm@...ts.linux.dev,
	Marc Zyngier <maz@...nel.org>, Will Deacon <will@...nel.org>,
	James Morse <james.morse@....com>,
	Oliver Upton <oliver.upton@...ux.dev>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Zenghui Yu <yuzenghui@...wei.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Joey Gouly <joey.gouly@....com>,
	Alexandru Elisei <alexandru.elisei@....com>,
	Christoffer Dall <christoffer.dall@....com>,
	Fuad Tabba <tabba@...gle.com>, linux-coco@...ts.linux.dev,
	Ganapatrao Kulkarni <gankulkarni@...amperecomputing.com>,
	Gavin Shan <gshan@...hat.com>,
	Shanker Donthineni <sdonthineni@...dia.com>,
	Alper Gun <alpergun@...gle.com>
Subject: Re: [PATCH v5 16/19] arm64: Enable memory encrypt for Realms

On Mon, Aug 19, 2024 at 02:19:21PM +0100, Steven Price wrote:
> From: Suzuki K Poulose <suzuki.poulose@....com>
> 
> Use the memory encryption APIs to trigger a RSI call to request a
> transition between protected memory and shared memory (or vice versa)
> and updating the kernel's linear map of modified pages to flip the top
> bit of the IPA. This requires that block mappings are not used in the
> direct map for realm guests.
> 
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
> Co-developed-by: Steven Price <steven.price@....com>
> Signed-off-by: Steven Price <steven.price@....com>

Reviewed-by: Catalin Marinas <catalin.marinas@....com>