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Thu, 10 Mar 2022 05:16:15 -0600 From: Bharata B Rao To: CC: , , , , , , , , , , , , "Bharata B Rao" Subject: [RFC PATCH v0 2/6] x86/cpufeatures: Add Upper Address Ignore(UAI) as CPU feature Date: Thu, 10 Mar 2022 16:45:41 +0530 Message-ID: <20220310111545.10852-3-bharata@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220310111545.10852-1-bharata@amd.com> References: <20220310111545.10852-1-bharata@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 8ec121ed-844a-4d92-35a0-08da0287680e X-MS-TrafficTypeDiagnostic: BL0PR12MB2388:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230001)(4636009)(46966006)(40470700004)(36840700001)(356005)(81166007)(86362001)(40460700003)(1076003)(2616005)(26005)(186003)(16526019)(336012)(7696005)(83380400001)(36756003)(316002)(426003)(54906003)(6916009)(2906002)(70586007)(47076005)(6666004)(70206006)(508600001)(7416002)(5660300002)(4326008)(82310400004)(8676002)(8936002)(36860700001)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Mar 2022 11:16:21.3917 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 8ec121ed-844a-4d92-35a0-08da0287680e X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT017.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL0PR12MB2388 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Currently the maximum logical address size for AMD processors in 64 bit mode is 57 bits. This means that the remaining 7 upper bits [63:57] are available for software use. With UAI feature turned ON, the processor ignores these upper bits when performing canonical check on these addresses. Add UAI as a CPU feature. Signed-off-by: Bharata B Rao --- arch/x86/include/asm/cpufeatures.h | 2 +- arch/x86/kernel/cpu/scattered.c | 1 + 2 files changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h index 6db4e2932b3d..5f4e88e67feb 100644 --- a/arch/x86/include/asm/cpufeatures.h +++ b/arch/x86/include/asm/cpufeatures.h @@ -201,7 +201,7 @@ #define X86_FEATURE_INVPCID_SINGLE ( 7*32+ 7) /* Effectively INVPCID && CR4.PCIDE=1 */ #define X86_FEATURE_HW_PSTATE ( 7*32+ 8) /* AMD HW-PState */ #define X86_FEATURE_PROC_FEEDBACK ( 7*32+ 9) /* AMD ProcFeedbackInterface */ -/* FREE! ( 7*32+10) */ +#define X86_FEATURE_UAI ( 7*32+10) /* AMD Upper Address Ignore */ #define X86_FEATURE_PTI ( 7*32+11) /* Kernel Page Table Isolation enabled */ #define X86_FEATURE_RETPOLINE ( 7*32+12) /* "" Generic Retpoline mitigation for Spectre variant 2 */ #define X86_FEATURE_RETPOLINE_AMD ( 7*32+13) /* "" AMD Retpoline mitigation for Spectre variant 2 */ diff --git a/arch/x86/kernel/cpu/scattered.c b/arch/x86/kernel/cpu/scattered.c index 21d1f062895a..5c19f6f525cf 100644 --- a/arch/x86/kernel/cpu/scattered.c +++ b/arch/x86/kernel/cpu/scattered.c @@ -42,6 +42,7 @@ static const struct cpuid_bit cpuid_bits[] = { { X86_FEATURE_CPB, CPUID_EDX, 9, 0x80000007, 0 }, { X86_FEATURE_PROC_FEEDBACK, CPUID_EDX, 11, 0x80000007, 0 }, { X86_FEATURE_MBA, CPUID_EBX, 6, 0x80000008, 0 }, + { X86_FEATURE_UAI, CPUID_EAX, 7, 0x80000021, 0 }, { 0, 0, 0, 0, 0 } }; -- 2.25.1