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Fri, 17 Jul 2026 18:06:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1784311594; bh=9dRlfhm2GJvO0NKET2nomIv2slIBL0lQ9SwCkEKvtM0=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=W4D94t/wneRBeRYLAxxxPKoeAyp9CDNhgy+7bpaY5yTYbVT8ophnINPXzQyM9OHYN uagA6UPpU0Lgd0flDoEB5rlssvKZ3tyRPfFbpPV2sf4zB7a3+52/Uwmoy4G5i14rxU R6qttKEJdgr3zR0OdDRKEWhPzw3UvFgaBhsrJTAssxanyZ8F5+nRj1wmIDiSTDvFfT C9XrJ8Uks6+0EVkTEMzI/n52dg18W/W/0DljfnwfNv/RbZ5MkYOz1a6E2e7S53d5Rv /7mUns0bXxC78eCQaFFkVK6EawRz39RdB16ufoyCKINyYamNITiKhCj3jV2gzhZkpL a4YscX7FQeceg== From: "Aneesh Kumar K.V (Arm)" To: iommu@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-coco@lists.linux.dev Cc: "Aneesh Kumar K.V (Arm)" , Robin Murphy , Marek Szyprowski , Will Deacon , Marc Zyngier , Steven Price , Suzuki K Poulose , 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 Subject: [PATCH v8 08/23] coco: arm64: s390: powerpc: Mark secure guests with CC_ATTR_GUEST_MEM_ENCRYPT Date: Fri, 17 Jul 2026 23:34:26 +0530 Message-ID: <20260717180442.110954-9-aneesh.kumar@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260717180442.110954-1-aneesh.kumar@kernel.org> References: <20260717180442.110954-1-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-Transfer-Encoding: 8bit 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) --- arch/arm64/mm/init.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/mm/init.c b/arch/arm64/mm/init.c index edcc305ec883..48d69e390158 100644 --- a/arch/arm64/mm/init.c +++ b/arch/arm64/mm/init.c @@ -419,6 +419,7 @@ 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() || is_protected_kvm_guest(); default: return false; diff --git a/arch/powerpc/platforms/pseries/cc_platform.c b/arch/powerpc/platforms/pseries/cc_platform.c index e8021af83a19..46e110a5a717 100644 --- a/arch/powerpc/platforms/pseries/cc_platform.c +++ b/arch/powerpc/platforms/pseries/cc_platform.c @@ -17,6 +17,7 @@ bool cc_platform_has(enum cc_attr attr) { switch (attr) { case CC_ATTR_MEM_ENCRYPT: + case CC_ATTR_GUEST_MEM_ENCRYPT: return is_secure_guest(); default: diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c index c29326c44af0..6b1c5a4fa9ce 100644 --- a/arch/s390/mm/init.c +++ b/arch/s390/mm/init.c @@ -148,6 +148,7 @@ bool cc_platform_has(enum cc_attr attr) { switch (attr) { case CC_ATTR_MEM_ENCRYPT: + case CC_ATTR_GUEST_MEM_ENCRYPT: return is_prot_virt_guest(); default: -- 2.43.0