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dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=arm.com; Received-SPF: Pass (protection.outlook.com: domain of arm.com designates 40.67.248.234 as permitted sender) receiver=protection.outlook.com; client-ip=40.67.248.234; helo=nebula.arm.com; pr=C Received: from nebula.arm.com (40.67.248.234) by DBAEUR03FT030.mail.protection.outlook.com (100.127.142.197) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.6043.23 via Frontend Transport; Fri, 27 Jan 2023 11:41:44 +0000 Received: from AZ-NEU-EX03.Arm.com (10.251.24.31) by AZ-NEU-EX04.Arm.com (10.251.24.32) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.16; Fri, 27 Jan 2023 11:41:44 +0000 Received: from e124191.cambridge.arm.com (10.1.197.45) by mail.arm.com (10.251.24.31) with Microsoft SMTP Server id 15.1.2507.16 via Frontend Transport; Fri, 27 Jan 2023 11:41:38 +0000 From: Joey Gouly To: Andrew Jones , , CC: , Alexandru Elisei , Christoffer Dall , Fuad Tabba , Jean-Philippe Brucker , Joey Gouly , Marc Zyngier , Mark Rutland , Oliver Upton , Paolo Bonzini , Quentin Perret , Steven Price , Suzuki K Poulose , "Thomas Huth" , Will Deacon , Zenghui Yu , , , , Subject: [RFC kvm-unit-tests 05/27] arm: Introduce NS_SHARED PTE attribute Date: Fri, 27 Jan 2023 11:40:46 +0000 Message-ID: <20230127114108.10025-6-joey.gouly@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230127114108.10025-1-joey.gouly@arm.com> References: <20230127112248.136810-1-suzuki.poulose@arm.com> <20230127114108.10025-1-joey.gouly@arm.com> Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain X-EOPAttributedMessage: 1 X-MS-TrafficTypeDiagnostic: DBAEUR03FT030:EE_|GV1PR08MB7682:EE_|AM7EUR03FT021:EE_|DB3PR08MB8889:EE_ X-MS-Office365-Filtering-Correlation-Id: 1f144fcc-534c-404b-5ecc-08db005b7dd1 x-checkrecipientrouted: true NoDisclaimer: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0; 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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Jan 2023 11:41:55.5173 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1f144fcc-534c-404b-5ecc-08db005b7dd1 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[63.35.35.123];Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: AM7EUR03FT021.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB3PR08MB8889 Introduce a new attribute to indicate the mapping is "Shared" with the host. This will be used by the Realms to share pages with the Host. For normal VMs, this is always 0. For realms, this is dynamic, depending on the IPA width. The top bit of the IPA is "treated" as the "NS_SHARED" attribute, making the VM access the unprotected alias of the IPA. By default, apply the NS_SHARED attribute for all I/O. Signed-off-by: Joey Gouly --- lib/arm/mmu.c | 5 ++++- lib/arm64/asm/pgtable.h | 6 ++++++ 2 files changed, 10 insertions(+), 1 deletion(-) diff --git a/lib/arm/mmu.c b/lib/arm/mmu.c index acaf5614..6f1f42f5 100644 --- a/lib/arm/mmu.c +++ b/lib/arm/mmu.c @@ -22,6 +22,8 @@ pgd_t *mmu_idmap; +/* Used by Realms, depends on IPA size */ +unsigned long prot_ns_shared = 0; unsigned long phys_mask_shift = 48; /* CPU 0 starts with disabled MMU */ @@ -194,7 +196,8 @@ void __iomem *__ioremap(phys_addr_t phys_addr, size_t size) { phys_addr_t paddr_aligned = phys_addr & PAGE_MASK; phys_addr_t paddr_end = PAGE_ALIGN(phys_addr + size); - pgprot_t prot = __pgprot(PTE_UNCACHED | PTE_USER | PTE_UXN | PTE_PXN); + pgprot_t prot = __pgprot(PTE_UNCACHED | PTE_USER | PTE_UXN | + PTE_PXN | PTE_NS_SHARED); pgd_t *pgtable; assert(sizeof(long) == 8 || !(phys_addr >> 32)); diff --git a/lib/arm64/asm/pgtable.h b/lib/arm64/asm/pgtable.h index 22ce64f0..5b9f40b0 100644 --- a/lib/arm64/asm/pgtable.h +++ b/lib/arm64/asm/pgtable.h @@ -22,6 +22,12 @@ #include extern unsigned long prot_ns_shared; +/* + * The Non-secure shared bit for Realms is actually part of the output + * address, however it is modeled as a PTE attribute. +*/ +#define PTE_NS_SHARED (prot_ns_shared) + /* * Highest possible physical address supported. */ -- 2.17.1