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b=LW7edWm+INDzPE5bcFFbciEhMLU0gOOI1ycwQv1LFHa7yNcSHS/aiTj3NQbwdgL2MUK8+X3zyV9Ro4T7zsK2gry3MOwb0R9cJ858b9tf7x4iHXaNdL2bJVGlWIVNdUL2kw7zRnUGTH5Tu+wz5ey12+5ntXnQhgBdaq6C4AubcOI= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=microsoft.com; Received: from DM6PR21MB1370.namprd21.prod.outlook.com (2603:10b6:5:16b::28) by BL0PR2101MB1316.namprd21.prod.outlook.com (2603:10b6:208:92::10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5901.8; Fri, 2 Dec 2022 03:32:05 +0000 Received: from DM6PR21MB1370.namprd21.prod.outlook.com ([fe80::c3e3:a6ef:232c:299b]) by DM6PR21MB1370.namprd21.prod.outlook.com ([fe80::c3e3:a6ef:232c:299b%9]) with mapi id 15.20.5901.008; Fri, 2 Dec 2022 03:32:05 +0000 From: Michael Kelley To: hpa@zytor.com, kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, luto@kernel.org, peterz@infradead.org, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, lpieralisi@kernel.org, robh@kernel.org, kw@linux.com, bhelgaas@google.com, arnd@arndb.de, hch@infradead.org, m.szyprowski@samsung.com, robin.murphy@arm.com, thomas.lendacky@amd.com, brijesh.singh@amd.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, Tianyu.Lan@microsoft.com, kirill.shutemov@linux.intel.com, sathyanarayanan.kuppuswamy@linux.intel.com, ak@linux.intel.com, isaku.yamahata@intel.com, dan.j.williams@intel.com, jane.chu@oracle.com, seanjc@google.com, tony.luck@intel.com, x86@kernel.org, linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org, netdev@vger.kernel.org, linux-pci@vger.kernel.org, linux-arch@vger.kernel.org, iommu@lists.linux.dev Cc: mikelley@microsoft.com Subject: [Patch v4 01/13] x86/ioapic: Gate decrypted mapping on cc_platform_has() attribute Date: Thu, 1 Dec 2022 19:30:19 -0800 Message-Id: <1669951831-4180-2-git-send-email-mikelley@microsoft.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1669951831-4180-1-git-send-email-mikelley@microsoft.com> References: <1669951831-4180-1-git-send-email-mikelley@microsoft.com> Content-Type: text/plain X-ClientProxiedBy: MW4PR04CA0234.namprd04.prod.outlook.com (2603:10b6:303:87::29) To DM6PR21MB1370.namprd21.prod.outlook.com (2603:10b6:5:16b::28) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6PR21MB1370:EE_|BL0PR2101MB1316:EE_ X-MS-Office365-Filtering-Correlation-Id: b62a164f-714a-4679-711b-08dad415c85b X-LD-Processed: 72f988bf-86f1-41af-91ab-2d7cd011db47,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?TOouGj/nnkA9oIKK9EX/XO0EeNNwHZBIe7Tu1FgkUZP/OPslwWR/XbEViWdt?= =?us-ascii?Q?Px0VGNa2nKHXEz0ev7Nlabik/T7nnP2VAvFN7MGG7zoK1LFZClvorMp6WSxz?= =?us-ascii?Q?jqEcul7twUKTVomuz67UudhU6ZUM1/75KWJXiSETw80NzTgMdfRKixhWv9IG?= =?us-ascii?Q?8lrDeEv/ZejzCZFHrT+lpO3w9dpsT7O/KDA9WXBDDkypmyXTuZR6QHxOT4jR?= =?us-ascii?Q?RJWvNb7kw2N2eVccC3Yc3HHKtmV40cY2LFesfWfCrn47Mu1FIIo8/rP9YhdV?= =?us-ascii?Q?RCHRPMe6m39iogTmDLNj9wCzYYICUTQtDchdog3Ly6EZYwaPoWu1sNovOWXy?= =?us-ascii?Q?zj58rPTsYvM/gqBylPsXEnYPOzcQmcrtSz/sXWYJMA22PakAro7CjhkZ6n19?= =?us-ascii?Q?YvDrGWAmOhTdQov5gWSuQ2vCNf+1JhfyU5Q/Czt54/d4dBHf21SnfZffXAP7?= =?us-ascii?Q?q3zqHAGoY8P57FpmyU23YT+VK7nlDBDe40htzsvA8lY5NoV24/Hss+gbOrsu?= =?us-ascii?Q?QDhmZSjqNR4BcbZXazpECTqI0mZVF0MO5fhF+tULRzFS+TxuKbivdi9s2R0U?= =?us-ascii?Q?x6034q2wV9Ukf9/ukGdK4FDMUEwhss/Uo0hUax73LiAQKIhRr5XD2GMp8fs0?= =?us-ascii?Q?SYddiRFXIoshL4iFnkm0OyHrBOusl9Jzu8qdo1sahqZcxFj3gzYFCK/dLVjf?= =?us-ascii?Q?U0pxHqAZO/7UALQcY8Qq6ihevhpUDMAyCGIuwQ7UEkM+l5sA0jUA3/8e9MxZ?= =?us-ascii?Q?+B95XJkRf7XOidnCpQx0YsBcn3Ji6mDTuiRV0Xrh+FpIz1fkPJN7TX8Ng+4q?= =?us-ascii?Q?gUGAvlgMzNywb7kLnrEk2g7mYztdBF2GHTAQRm2Q/wEQelQ29bCYdmdyFM3w?= =?us-ascii?Q?9MwiBjywc5rHgw2Q9vZBKCV+9Sc0z8VuJOPjAMNNYqjKUCqnAfveatT5VcTE?= =?us-ascii?Q?MwSM0OeOyKoA+9opKAfOA0IcxLkiByOA0TmqaGB6teRcPxtkYg4FwJUQ1CAC?= =?us-ascii?Q?BxWrRjOSCAWThldcfG+j0W3wusERArzkk1Qx6ZXPALSXEP6/yfcn4+DRimf8?= =?us-ascii?Q?mJxox505dKLJHrDxG7dMnOzsOfAHZwUEDPYrzhzSWQ6aPT0qazqDRGoQrevP?= =?us-ascii?Q?DYUw3Qq1195KZqg5cFLSZ6H8Kr84vvvy3q2NXijRygO0pLIVJqOPrQP19dAC?= =?us-ascii?Q?+pwmV8IkKVcUOraJqbXLUsGKgH2nA0+k5WfvnZf1OpppMxZfEpCdyQ1cEPEH?= =?us-ascii?Q?k+XdQIFxQFJR+10nf0mDDpphivHGFMR2uj7I2XGLeYT5vMjf7I3Lfbb6UTD7?= =?us-ascii?Q?cdHHnEnHKgvLrE6bYloN7v6GJFiyQ7/3irJDO0JtDRY9iD6HVOGDap8z1i4y?= =?us-ascii?Q?3TknWsWC9Iu4SUAn+Cj16FbiliLbDSWZ3xnOZLC1E5d3N5WptSC1aM6bZZ8y?= =?us-ascii?Q?UimqBi/XqeBtP2EtSuXGVEpMbUGeKeri+liFQH/hdOOybyXuehdkDtS6XYwk?= =?us-ascii?Q?mDdHN7inMkpmLvfA0DcTG9tLObtoRhpKjI+YbBBTYWvpJfSmdRioYv7YYshY?= =?us-ascii?Q?F24kXmAcxin84aTV9oD1A140tCaLqjPYTo/RKm9qIfJccq3ICSZsd/Eu9KXq?= =?us-ascii?Q?YQ=3D=3D?= X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: b62a164f-714a-4679-711b-08dad415c85b X-MS-Exchange-CrossTenant-AuthSource: DM6PR21MB1370.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Dec 2022 03:32:04.9541 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: kS5Wpc5s6X4RKXDwKEZ3DcO3lMjG7pQ4amWqULAqvMIbaG+TF91DhqD9uPNsz1FuuMNbDHdwOEfBxPChOwL0xg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL0PR2101MB1316 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Current code always maps the IO-APIC as shared (decrypted) in a confidential VM. But Hyper-V guest VMs on AMD SEV-SNP with vTOM enabled use a paravisor running in VMPL0 to emulate the IO-APIC. In such a case, the IO-APIC must be accessed as private (encrypted). Fix this by gating the IO-APIC decrypted mapping on a new cc_platform_has() attribute that a subsequent patch in the series will set only for guests using vTOM. Signed-off-by: Michael Kelley Reviewed-by: Wei Liu --- arch/x86/kernel/apic/io_apic.c | 3 ++- include/linux/cc_platform.h | 12 ++++++++++++ 2 files changed, 14 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c index a868b76..2b70e2e 100644 --- a/arch/x86/kernel/apic/io_apic.c +++ b/arch/x86/kernel/apic/io_apic.c @@ -2686,7 +2686,8 @@ static void io_apic_set_fixmap(enum fixed_addresses idx, phys_addr_t phys) * Ensure fixmaps for IOAPIC MMIO respect memory encryption pgprot * bits, just like normal ioremap(): */ - flags = pgprot_decrypted(flags); + if (!cc_platform_has(CC_ATTR_ACCESS_IOAPIC_ENCRYPTED)) + flags = pgprot_decrypted(flags); __set_fixmap(idx, phys, flags); } diff --git a/include/linux/cc_platform.h b/include/linux/cc_platform.h index cb0d6cd..7b63a7d 100644 --- a/include/linux/cc_platform.h +++ b/include/linux/cc_platform.h @@ -90,6 +90,18 @@ enum cc_attr { * Examples include TDX Guest. */ CC_ATTR_HOTPLUG_DISABLED, + + /** + * @CC_ATTR_ACCESS_IOAPIC_ENCRYPTED: Guest VM IO-APIC is encrypted + * + * The platform/OS is running as a guest/virtual machine with + * an IO-APIC that is emulated by a paravisor running in the + * guest VM context. As such, the IO-APIC is accessed in the + * encrypted portion of the guest physical address space. + * + * Examples include Hyper-V SEV-SNP guests using vTOM. + */ + CC_ATTR_ACCESS_IOAPIC_ENCRYPTED, }; #ifdef CONFIG_ARCH_HAS_CC_PLATFORM -- 1.8.3.1