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c=simple/simple; d=arm.com; s=foss; t=1783443539; bh=oftr5G3z6oBFV+GyZMslvtqhdQup3zVW7NYWudILDro=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=J6v2nAcRCNpFw9tipYNPbCKnfR8iFde0+KzBbP0B3K2mz0ujgYDRy+VwFGktKRv2z X8AGtqBWVpyqZUf4u6DfAHxBW5lfZj+N0eRs5hl4SptX1ZSmjrqSPoGb2LgAo/aLPr cSJFc8xIxc30w+dQMcq1+PliaWcEFwqlAXdZ5TMU= Date: Tue, 7 Jul 2026 17:58:52 +0100 From: Catalin Marinas To: "Aneesh Kumar K.V (Arm)" Cc: iommu@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-coco@lists.linux.dev, Robin Murphy , Marek Szyprowski , Will Deacon , Marc Zyngier , Steven Price , Suzuki K Poulose , Jiri Pirko , Jason Gunthorpe , Mostafa Saleh , Petr Tesarik , Alexey Kardashevskiy , Dan Williams , Xu Yilun , linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , "Christophe Leroy (CS GROUP)" , Alexander Gordeev , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , Sven Schnelle , x86@kernel.org Subject: Re: [PATCH v7 08/22] coco: arm64: s390: powerpc: Mark secure guests with CC_ATTR_GUEST_MEM_ENCRYPT Message-ID: References: <20260701054926.825925-1-aneesh.kumar@kernel.org> <20260701054926.825925-9-aneesh.kumar@kernel.org> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260701054926.825925-9-aneesh.kumar@kernel.org> On Wed, Jul 01, 2026 at 11:19:12AM +0530, Aneesh Kumar K.V (Arm) wrote: > arm64 Realms, powerpc secure guests and s390 protected virtualization > guests currently report CC_ATTR_MEM_ENCRYPT, but not > CC_ATTR_GUEST_MEM_ENCRYPT. > > These environments are all secure guest configurations. Their > force_dma_unencrypted() implementations also treat the same secure guest > state as requiring unencrypted DMA. Report CC_ATTR_GUEST_MEM_ENCRYPT for > the same condition so generic confidential-computing code can distinguish > guest memory encryption from host memory encryption instead of relying only > on CC_ATTR_MEM_ENCRYPT. > > Signed-off-by: Aneesh Kumar K.V (Arm) For arm64: Acked-by: Catalin Marinas