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Wed, 1 Jul 2026 05:50:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1782885050; bh=Rrxw0zEy8zZMWEqkMIDa1FzZShUbfKRclWdKlq0ShMQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=LAVOzFxKcoBDvcIA/cL8+8v7XY/9P5ba4CrqnsrbqlhfEZ5g4MK5OQ74GAghLavvj o+JLad1Wg9OinqXokjs/3hytR6AywooUcXw+wjcaN/F5Np2i2Yy+gvQI+kaGBm3VRK l/W42WUmQzsFbFYjHOJrYnQO9q33t4cB9Cl+BcgwhN05+UwImbPdZZkdY7FTk0gNXF FVAC/vZRvHTO3Dp+mcbdGNZrgKugW5uEdQ7bVByHuY2QanpiPo3CjFP1m/h98/9Q0i 1IiXs7eRvC4AhfagR2rw6tY1gFdou4tKw+G+PtNggm5tV9wna0xvQxKWFmudBnp/gW 1Rx06Eda1YzDw== 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, Halil Pasic , Matthew Rosato , Jaehoon Kim Subject: [PATCH v7 06/22] s390: Expose protected virtualization through cc_platform_has() Date: Wed, 1 Jul 2026 11:19:10 +0530 Message-ID: <20260701054926.825925-7-aneesh.kumar@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260701054926.825925-1-aneesh.kumar@kernel.org> References: <20260701054926.825925-1-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 Protected virtualization guests use memory encryption, so advertise that to the rest of the kernel through cc_platform_has(CC_ATTR_MEM_ENCRYPT). s390 already forces DMA mappings to be unencrypted for protected virtualization guests through force_dma_unencrypted(). Add ARCH_HAS_CC_PLATFORM and provide the matching cc_platform_has() implementation Cc: Halil Pasic Cc: Matthew Rosato Cc: Jaehoon Kim Tested-by: Jaehoon Kim Signed-off-by: Aneesh Kumar K.V (Arm) --- arch/s390/Kconfig | 1 + arch/s390/mm/init.c | 14 ++++++++++++++ 2 files changed, 15 insertions(+) diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index 84404e6778d5..ab1bf55d197a 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -84,6 +84,7 @@ config S390 select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2 select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE select ARCH_HAS_CC_CAN_LINK + select ARCH_HAS_CC_PLATFORM select ARCH_HAS_CPU_FINALIZE_INIT select ARCH_HAS_CURRENT_STACK_POINTER select ARCH_HAS_DEBUG_VIRTUAL diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c index f07168a0d3dd..c29326c44af0 100644 --- a/arch/s390/mm/init.c +++ b/arch/s390/mm/init.c @@ -50,6 +50,7 @@ #include #include #include +#include pgd_t swapper_pg_dir[PTRS_PER_PGD] __section(".bss..swapper_pg_dir"); pgd_t invalid_pg_dir[PTRS_PER_PGD] __section(".bss..invalid_pg_dir"); @@ -142,6 +143,19 @@ bool force_dma_unencrypted(struct device *dev) return is_prot_virt_guest(); } + +bool cc_platform_has(enum cc_attr attr) +{ + switch (attr) { + case CC_ATTR_MEM_ENCRYPT: + return is_prot_virt_guest(); + + default: + return false; + } +} +EXPORT_SYMBOL_GPL(cc_platform_has); + /* protected virtualization */ static void __init pv_init(void) { -- 2.43.0