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b=YcCuSd4USWQ9JvBOwgdQS/XGW7fN5UF5gHXcM0Ogcbv+GMTsGplKLOKCsaQ73/VF8 1xuAF2K12iBvJ56gFYBusyY7CPREK4DmWCZ4DbU0txiXaoauL4t7iPzZRJzuP3+6Uq EAUVgOWIKMO2gsIMqcbYolSuec2zbVTSCMm62+CI= Message-ID: <8d6b24ea-3a63-497e-9ce9-6a8e4d340665@arm.com> Date: Tue, 7 Jul 2026 16:41:40 +0100 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 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v7 08/22] coco: arm64: s390: powerpc: Mark secure guests with CC_ATTR_GUEST_MEM_ENCRYPT Content-Language: en-GB To: "Aneesh Kumar K.V (Arm)" , iommu@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-coco@lists.linux.dev Cc: Robin Murphy , Marek Szyprowski , Will Deacon , Marc Zyngier , Steven Price , Catalin Marinas , 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 References: <20260701054926.825925-1-aneesh.kumar@kernel.org> <20260701054926.825925-9-aneesh.kumar@kernel.org> From: Suzuki K Poulose In-Reply-To: <20260701054926.825925-9-aneesh.kumar@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 01/07/2026 06:49, 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 bits: > --- > arch/arm64/kernel/rsi.c | 1 + > arch/powerpc/platforms/pseries/cc_platform.c | 1 + > arch/s390/mm/init.c | 1 + > 3 files changed, 3 insertions(+) > > diff --git a/arch/arm64/kernel/rsi.c b/arch/arm64/kernel/rsi.c > index 92160f2e57ff..207e36db1e7a 100644 > --- a/arch/arm64/kernel/rsi.c > +++ b/arch/arm64/kernel/rsi.c > @@ -27,6 +27,7 @@ bool cc_platform_has(enum cc_attr attr) > { > switch (attr) { > case CC_ATTR_MEM_ENCRYPT: > + case CC_ATTR_GUEST_MEM_ENCRYPT: > return is_realm_world(); > default: > return false; Reviewed-by: Suzuki K Poulose Suzuki