From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4B6F025B0A6; Fri, 22 May 2026 04:29:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779424143; cv=none; b=ON2mWV0RwWKMgKICMSgh+hxJd0beDedBCvjxwV1fY2ulvVgowZ1yQHO4jXCEt2g7fr+2eEYqAS2VU9nccL5bEEgdSSrV88ZiFEoOcI/NskOUHwRMjvx8mRv2ftvMKo04E80il/W5UeYfG6l57orRGpwxQxkTrx8PB/YuJzf0uMw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779424143; c=relaxed/simple; bh=iylfyXBNO6S14YbSeAPeNtbQXHgcnAOZOy6z6gxK0Ig=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=bcQBUp4INNRj/3Vi88fPbwoZx6ug0fpcebVB09MxSqPqlQ4cpJLV0Q/2NRA7RPtvur/9JSBT4WW2mDMH9coQoi64cuwVxxXFHPiRJz6mdQaJZZuz70Z45FRHEpYuZ7GReS/AGtP6W8Gf/6eKc5n6/UV9/wmZCfE49j8IFvxXfNM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=oQoyawK8; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="oQoyawK8" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9D13A1F000E9; Fri, 22 May 2026 04:28:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1779424141; bh=4aF9+d8jwgDAX56PY9Oecf4wOZ9YOQdZwhZO6X/dmDA=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=oQoyawK8y+HW7VDzUabZEzIrZMxRHXdpf/BDYPznoAE+Q6F0scH3UnMFqICzd6qWv 4LbbljSgBLQjqtntkeO/+IVq4sO6eqL3fn3WTONJfIDhngF9Ngl7YYO9x4U4fdJwcr 7hThxT/Jz/LlAG05H970ULFr26ngAdhF3QzgfIFW5MKIZA1M4jQ1W5XJyM7zc8EVoG KB1BH9PWN7nrgb79LWOpW0nTN03ONx6qqd0lRzmgZnfJ874m5C3f6fGj2Kqqa7TcBy DLNynTYhdlh9Cey8CGdd/mrmFS+4vFir/UlmRMRvjCphkLeHJFBObp2YnnyhkwIu+j LsbLqIQqmxb0Q== 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 v5 02/20] [DO NOT MERGE] s390: Expose protected virtualization through cc_platform_has() Date: Fri, 22 May 2026 09:57:57 +0530 Message-ID: <20260522042815.370873-3-aneesh.kumar@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260522042815.370873-1-aneesh.kumar@kernel.org> References: <20260522042815.370873-1-aneesh.kumar@kernel.org> Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: 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 Signed-off-by: Aneesh Kumar K.V (Arm) --- Cc: Halil Pasic Cc: Matthew Rosato Cc: Jaehoon Kim --- 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 ecbcbb781e40..9b5e6029e043 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -87,6 +87,7 @@ 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 1f72efc2a579..ad3c6d92b801 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"); @@ -140,6 +141,19 @@ 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