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Peter Anvin" , Ingo Molnar , Joao Martins , Jonathan Corbet , "Konrad Rzeszutek Wilk" , Paolo Bonzini , Sean Christopherson , Thomas Gleixner , David Woodhouse , Greg Kroah-Hartman , Juergen Gross , Peter Zijlstra , Tony Luck , Tom Lendacky , Alexey Kardashevskiy , , , Subject: [PATCH v3 2/7] x86/cpu, kvm: Define a scattered Null Selector Clears Base feature bit Date: Tue, 29 Nov 2022 17:58:11 -0600 Message-ID: <20221129235816.188737-3-kim.phillips@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221129235816.188737-1-kim.phillips@amd.com> References: <20221129235816.188737-1-kim.phillips@amd.com> MIME-Version: 1.0 X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6NAM11FT112:EE_|DM6PR12MB4252:EE_ X-MS-Office365-Filtering-Correlation-Id: aa1b7b52-0eb8-4c46-cce0-08dad265acfb 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:(13230022)(4636009)(39860400002)(396003)(346002)(376002)(136003)(451199015)(40470700004)(36840700001)(46966006)(356005)(81166007)(86362001)(40480700001)(16526019)(70586007)(336012)(41300700001)(186003)(8676002)(8936002)(70206006)(4326008)(26005)(2616005)(478600001)(40460700003)(7696005)(316002)(6666004)(6916009)(36860700001)(83380400001)(82740400003)(44832011)(54906003)(7416002)(5660300002)(426003)(1076003)(47076005)(2906002)(36756003)(82310400005)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 29 Nov 2022 23:58:56.1278 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: aa1b7b52-0eb8-4c46-cce0-08dad265acfb 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: DM6NAM11FT112.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB4252 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 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 X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1750876971852149727?= X-GMAIL-MSGID: =?utf-8?q?1750876971852149727?= It's a part of the CPUID 0x80000021 leaf, and this allows us to group this and other CPUID 0x80000021 EAX feature bits to being propagated via kvm_set_cpu_caps instead of open-coding them in __do_cpuid_func(). Also use the feature bit definition in check_null_seg_clears_base() instead of open-coding it. Signed-off-by: Kim Phillips --- arch/x86/include/asm/cpufeatures.h | 1 + arch/x86/kernel/cpu/common.c | 3 +-- arch/x86/kernel/cpu/scattered.c | 1 + 3 files changed, 3 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h index b16fdcedc2b5..5ddde18c1ae8 100644 --- a/arch/x86/include/asm/cpufeatures.h +++ b/arch/x86/include/asm/cpufeatures.h @@ -308,6 +308,7 @@ #define X86_FEATURE_CALL_DEPTH (11*32+19) /* "" Call depth tracking for RSB stuffing */ #define X86_FEATURE_MSR_TSX_CTRL (11*32+20) /* "" MSR IA32_TSX_CTRL (Intel) implemented */ #define X86_FEATURE_NO_NESTED_DATA_BP (11*32+21) /* "" AMD No Nested Data Breakpoints */ +#define X86_FEATURE_NULL_SEL_CLR_BASE (11*32+22) /* "" AMD Null Selector Clears Base */ /* Intel-defined CPU features, CPUID level 0x00000007:1 (EAX), word 12 */ #define X86_FEATURE_AVX_VNNI (12*32+ 4) /* AVX VNNI instructions */ diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index 73cc546e024d..8d28cd7c9072 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -1683,8 +1683,7 @@ void check_null_seg_clears_base(struct cpuinfo_x86 *c) return; /* Zen3 CPUs advertise Null Selector Clears Base in CPUID. */ - if (c->extended_cpuid_level >= 0x80000021 && - cpuid_eax(0x80000021) & BIT(6)) + if (cpu_has(c, X86_FEATURE_NULL_SEL_CLR_BASE)) return; /* diff --git a/arch/x86/kernel/cpu/scattered.c b/arch/x86/kernel/cpu/scattered.c index 079e253e1049..d0734cc19d37 100644 --- a/arch/x86/kernel/cpu/scattered.c +++ b/arch/x86/kernel/cpu/scattered.c @@ -46,6 +46,7 @@ static const struct cpuid_bit cpuid_bits[] = { { X86_FEATURE_PROC_FEEDBACK, CPUID_EDX, 11, 0x80000007, 0 }, { X86_FEATURE_MBA, CPUID_EBX, 6, 0x80000008, 0 }, { X86_FEATURE_NO_NESTED_DATA_BP,CPUID_EAX, 0, 0x80000021, 0 }, + { X86_FEATURE_NULL_SEL_CLR_BASE,CPUID_EAX, 6, 0x80000021, 0 }, { X86_FEATURE_PERFMON_V2, CPUID_EAX, 0, 0x80000022, 0 }, { X86_FEATURE_AMD_LBR_V2, CPUID_EAX, 1, 0x80000022, 0 }, { 0, 0, 0, 0, 0 }