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 350813E5A15; Thu, 4 Jun 2026 08:40:22 +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=1780562429; cv=none; b=IeQuYRsrmIcE74uzwsp6MD7kTPRtZJSQsmLmpl1lBI3XTyFYfkVBVd/f7RJSHEwyNMjU8rSXLbwb6xWOT/TQPxbpdIA5TH9jJVJnnG3cClqJkUEJrO7rZdL9BTz5cLPQf0dCq9DoNZt4W2wPDsCvfhCUmpqX/HC4WXP8tcUFsNU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780562429; c=relaxed/simple; bh=iylfyXBNO6S14YbSeAPeNtbQXHgcnAOZOy6z6gxK0Ig=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=stLKpNxYue4lxPbhI8fZjvofA5BbSRvKzYGyyqIUb0UMO5lQo2J/5APx064Kb1cjdxQUGgJWxR7oSwMWLQ8ig2Qhe1qrVCM1XrT2ZFsCCGYxJCwGQKZrzRh40xbabs4yvyjSUlJPkkVsAzwUh+u+wZ5oozteCHMCV/dDP/iLdZ8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ZSAcfFlh; 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="ZSAcfFlh" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BC06B1F00898; Thu, 4 Jun 2026 08:40:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1780562422; bh=4aF9+d8jwgDAX56PY9Oecf4wOZ9YOQdZwhZO6X/dmDA=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=ZSAcfFlhwVoXj+bvE9YfbowEqQBV1/lgoSIeAFRJcpkKHwSs/j6JzCILJWkoZrYhQ kFn6+KM7tJBsYQQBgnfTV2opqNsAG0x3D+sFC7a+6IWdM24Wvu579IiQJr5KPHuhpk +Q9cG9POofUpPzLkKXLr2AZMA1JBJtglWRqpYpO92nmXndSknhtqkGaYmPxAYJnxBB L1c6KC8V5RRssQOFW3NZC1aoelPWsOtMhR8NSBtEEqbQMOE0yOwQoHtOgjbBM/1abX 9MjBsnZeCbQt1ioCBWhXC62eBjVL0V2x4ezbsIA4JafSB7JeyX+7WS922MqP2zcwpf bk1DLeIniUmLw== 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 v6 01/20] s390: Expose protected virtualization through cc_platform_has() Date: Thu, 4 Jun 2026 14:09:40 +0530 Message-ID: <20260604083959.1265923-2-aneesh.kumar@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260604083959.1265923-1-aneesh.kumar@kernel.org> References: <20260604083959.1265923-1-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