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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 v6 2/7] x86/cpu, kvm: Add the NO_NESTED_DATA_BP feature Date: Tue, 10 Jan 2023 16:46:38 -0600 Message-ID: <20230110224643.452273-4-kim.phillips@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230110224643.452273-1-kim.phillips@amd.com> References: <20230110224643.452273-1-kim.phillips@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-TrafficTypeDiagnostic: CO1PEPF00001A63:EE_|CY5PR12MB6106:EE_ X-MS-Office365-Filtering-Correlation-Id: 07bc9dcf-0047-4c40-c743-08daf35ca7d2 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: pyB+sLq3chMkfxR2ApdquE8DgD3TPwSPhyLMpxKQjKKUPwgNT24rwhKgOyJhrsqo5qSZA/v/Uje67OPtsiSWhVMgK5lLigdUBB+n9p+YiJ9kw77v5hyRA69qzX1GsUH/41lw3JdZLT+S0EpcfgyZvLWwI4o1aKrXZZDgHQRRI1VHBY5uqOlIsiOmg1Nkdoc/1aooqBUQSWmtvVykz3IstEMX0Y9ZuNdRA3DyRusgVXEDtmKVPtP7WvVYw5oUDT7gC8oMZDqidF7cyPuWfyHlA1nV7fny8N0QVrMEBLlVVs5x//XDu9leXg2OGyvS2ghv/yYaKZ6HuUN0NPB6HKiUX8njQHxdHsGknViSadEv3TPIoaJ9rY7sljKJd1TgvxkGcB8w7zQ049EAkA4pq8KQmRPjqhr0dIygeg+ZFegAvj6IKuP7nBFlBN7P8d59J48yHAlXVUBg7LIutrTjn5x47x/CILEDGkW6aLaO6UCUzExZr+/nAzBvT8ngzKnBQ4OVnOsfPY0SGNaR4DG5hRe7zJsooOPbn58KIeu62FaffFAjwAtagyyDNYEFv6HizFzVfi9AixXQG5c4Kjbzykt2QhFFhKm7G1farTMxfYxJtBEF+EJrpbosHbYLoOKqvSiS+2uF49XiyG8fYFA85uUHg4k2dFtEtg5TrdZ9u0ecuFTfdU92+jqYJ0meKww3foA8RN15sY0w/SCxMlotXFMdNqVQWHCg0A+4/gdSr0us8GU= 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)(346002)(39860400002)(396003)(136003)(376002)(451199015)(36840700001)(40470700004)(46966006)(2616005)(186003)(44832011)(5660300002)(1076003)(316002)(478600001)(16526019)(7416002)(26005)(7696005)(40480700001)(426003)(41300700001)(47076005)(40460700003)(336012)(8676002)(6916009)(54906003)(70206006)(70586007)(4326008)(8936002)(83380400001)(82310400005)(36756003)(86362001)(356005)(36860700001)(82740400003)(6666004)(2906002)(81166007)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Jan 2023 22:47:30.2933 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 07bc9dcf-0047-4c40-c743-08daf35ca7d2 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: CO1PEPF00001A63.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY5PR12MB6106 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The "Processor ignores nested data breakpoints" feature was being open-coded for KVM in __do_cpuid_func(). Add it to its newly added CPUID leaf 0x80000021 EAX proper, and propagate it in kvm_set_cpu_caps() instead. Also drop the bit description comments now it's more self-describing. Signed-off-by: Kim Phillips --- arch/x86/include/asm/cpufeatures.h | 3 +++ arch/x86/kvm/cpuid.c | 8 ++++++-- 2 files changed, 9 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h index d53e13048d2e..0cd7b4afd528 100644 --- a/arch/x86/include/asm/cpufeatures.h +++ b/arch/x86/include/asm/cpufeatures.h @@ -426,6 +426,9 @@ #define X86_FEATURE_V_TSC_AUX (19*32+ 9) /* "" Virtual TSC_AUX */ #define X86_FEATURE_SME_COHERENT (19*32+10) /* "" AMD hardware-enforced cache coherency */ +/* AMD-defined Extended Feature 2 EAX, CPUID level 0x80000021 (EAX), word 20 */ +#define X86_FEATURE_NO_NESTED_DATA_BP (20*32+ 0) /* "" AMD No Nested Data Breakpoints */ + /* * BUG word(s) */ diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index b14653b61470..69e433e4e9ff 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -741,6 +741,10 @@ void kvm_set_cpu_caps(void) 0 /* SME */ | F(SEV) | 0 /* VM_PAGE_FLUSH */ | F(SEV_ES) | F(SME_COHERENT)); + kvm_cpu_cap_mask(CPUID_8000_0021_EAX, + F(NO_NESTED_DATA_BP) + ); + kvm_cpu_cap_mask(CPUID_C000_0001_EDX, F(XSTORE) | F(XSTORE_EN) | F(XCRYPT) | F(XCRYPT_EN) | F(ACE2) | F(ACE2_EN) | F(PHE) | F(PHE_EN) | @@ -1222,9 +1226,9 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function) break; case 0x80000021: entry->ebx = entry->ecx = entry->edx = 0; + cpuid_entry_override(entry, CPUID_8000_0021_EAX); /* * Pass down these bits: - * EAX 0 NNDBP, Processor ignores nested data breakpoints * EAX 2 LAS, LFENCE always serializing * EAX 6 NSCB, Null selector clear base * @@ -1235,7 +1239,7 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function) * KVM doesn't support SMM_CTL. * EAX 9 SMM_CTL MSR is not supported */ - entry->eax &= BIT(0) | BIT(2) | BIT(6); + entry->eax &= BIT(2) | BIT(6); entry->eax |= BIT(9); if (static_cpu_has(X86_FEATURE_LFENCE_RDTSC)) entry->eax |= BIT(2); -- 2.34.1