linux-kernel - Re: [PATCH v3 0/3] arm64: realm: Fix DMA address for devices

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Message-Id: <174171334191.3659388.13494602275110471880.b4-ty@arm.com>
Date: Tue, 11 Mar 2025 17:15:48 +0000
From: Catalin Marinas <catalin.marinas@....com>
To: linux-kernel@...r.kernel.org,
	Suzuki K Poulose <suzuki.poulose@....com>
Cc: Will Deacon <will@...nel.org>,
	maz@...nel.org,
	steven.price@....com,
	aneesh.kumar@...nel.org,
	gshan@...hat.com,
	robin.murphy@....com,
	linux-arm-kernel@...ts.infradead.org,
	Jean-Philippe Brucker <jean-philippe@...aro.org>,
	Christoph Hellwig <hch@....de>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Tom Lendacky <thomas.lendacky@....com>
Subject: Re: [PATCH v3 0/3] arm64: realm: Fix DMA address for devices

On Thu, 27 Feb 2025 14:41:47 +0000, Suzuki K Poulose wrote:
> Linux can be run as a Confidential Guest in Arm CCA from Linux v6.13. The address
> space (GPA or IPA) of a Realm VM is split into two halves, with private bottom
> half and shared top half. In Linux we treat the "top" bit of the IPA space as
> an attribute, to indicate whether it is shared or not (MSB == 1 implies shared).
> Stage2 (GPA to PA) translations used by the CPU accesses, cover the full IPA space,
> and are managed by RMM. The "top" bit as attribute is only a software construct.
> 
> [...]

Applied to arm64 (for-next/cca-dma-address), thanks!

[1/3] dma: Fix encryption bit clearing for dma_to_phys
      https://git.kernel.org/arm64/c/c380931712d1
[2/3] dma: Introduce generic dma_addr_*crypted helpers
      https://git.kernel.org/arm64/c/b66e2ee7b6c8
[3/3] arm64: realm: Use aliased addresses for device DMA to shared buffers
      https://git.kernel.org/arm64/c/7d953a062416

-- 
Catalin