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 98F7527AC4C; Fri, 17 Jul 2026 18:06:12 +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=1784311573; cv=none; b=cLF4UCmWfgmZFKFoorqRMJZVbiB26DdXQJLjoOfa2IAbS1BMv5BRoZPip+OjiTCYZeWfZQ3VyTsAiOF7ybreAK5iMbIwW0t/5gA/j/lQbX6yPYMXGDqOPVftCVNAlkIva1BtCam49yTnzhI6PMtDTh750K44xpOV4B6doB3VWUU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784311573; c=relaxed/simple; bh=j1TDEzVVIIA8q2Uvy+R53B4H2W7vI89z2yjA/W5mds4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=WnWkdqgghxAB3lqbhZFGwf2+WNwzOcooUoGMSp+fR/cmtQiPLoBu8NzDR45/g6IFCBRqmTLETK/r1XgBLSq9P86H9CIPMhAg/gPBbRK8WuPDIQdmBNx5CAmMKVFeAzNILagRO7xuEgyh/Tm8DkAMwWNqaGjGlOfBvS3XX3f0MAg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=EERFj5zc; 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="EERFj5zc" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BCEE21F000E9; Fri, 17 Jul 2026 18:06:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1784311571; bh=Rrxw0zEy8zZMWEqkMIDa1FzZShUbfKRclWdKlq0ShMQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=EERFj5zc2d1jA+hIVXVcVJggI1VJBh6HdI8oHQug+TwsCjCPDhkj8fgqKZNT5UKmQ skT7ficUTZLNY6S5Q3WuT+J3gDPyb5GnOK0eE4+99RLNKTOi0lmWjkSlC/FxYVNHnn q+TDBxiQ5oDyN2mWpC+pdJKRIjdGTidnIJ2DRnbkb/Wwweh43EfdUgHvUnqdvibl/B e/zfr+LG1u2pOOInDppAvmMm2gA8NijvsUlHIklzuhUedsUdhgRC1xjDdCSCqYxnZL whMwkwGTaERO5lLJjICrZdh5y2RbN8VXWq6eAWyMjpTj/NNgKByqrALdpvYGXDfxBD AzsJQx65teoug== 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 v8 06/23] s390: Expose protected virtualization through cc_platform_has() Date: Fri, 17 Jul 2026 23:34:24 +0530 Message-ID: <20260717180442.110954-7-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> 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 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