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Peter Anvin" Subject: [PATCH kernel 1/3] x86/amd/dr_addr_mask: Cache values in percpu variables Date: Thu, 1 Dec 2022 13:19:46 +1100 Message-ID: <20221201021948.9259-2-aik@amd.com> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221201021948.9259-1-aik@amd.com> References: <20221201021948.9259-1-aik@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: BN8NAM11FT115:EE_|CY8PR12MB7610:EE_ X-MS-Office365-Filtering-Correlation-Id: 9d418dcf-13e6-4d0d-99af-08dad342a645 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)(376002)(346002)(136003)(396003)(451199015)(40470700004)(36840700001)(46966006)(7049001)(7416002)(5660300002)(26005)(54906003)(8936002)(316002)(6862004)(8676002)(4326008)(36756003)(37006003)(36860700001)(70586007)(41300700001)(83380400001)(40460700003)(40480700001)(81166007)(356005)(47076005)(82740400003)(478600001)(6666004)(2616005)(426003)(70206006)(82310400005)(336012)(186003)(16526019)(1076003)(2906002)(6200100001)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Dec 2022 02:20:43.6759 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 9d418dcf-13e6-4d0d-99af-08dad342a645 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: BN8NAM11FT115.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY8PR12MB7610 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?1750976564670500730?= X-GMAIL-MSGID: =?utf-8?q?1750976564670500730?= Reading DR[0-3]_ADDR_MASK MSRs takes about 250 cycles which is going to be noticeable when the AMD KVM SEV-ES's DebugSwap feature is enabled and KVM needs to store these before switching to a guest; the DebugSwitch hardware support restores them as type B swap. This stores MSR values from set_dr_addr_mask() in percpu values and returns them via new get_dr_addr_mask(). The gain here is about 10x. Signed-off-by: Alexey Kardashevskiy --- arch/x86/include/asm/debugreg.h | 1 + arch/x86/kernel/cpu/amd.c | 32 ++++++++++++++++++++ 2 files changed, 33 insertions(+) diff --git a/arch/x86/include/asm/debugreg.h b/arch/x86/include/asm/debugreg.h index cfdf307ddc01..c4324d0205b5 100644 --- a/arch/x86/include/asm/debugreg.h +++ b/arch/x86/include/asm/debugreg.h @@ -127,6 +127,7 @@ static __always_inline void local_db_restore(unsigned long dr7) #ifdef CONFIG_CPU_SUP_AMD extern void set_dr_addr_mask(unsigned long mask, int dr); +extern unsigned long get_dr_addr_mask(int dr); #else static inline void set_dr_addr_mask(unsigned long mask, int dr) { } #endif diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c index c75d75b9f11a..ec7efcef4e14 100644 --- a/arch/x86/kernel/cpu/amd.c +++ b/arch/x86/kernel/cpu/amd.c @@ -1158,6 +1158,11 @@ static bool cpu_has_amd_erratum(struct cpuinfo_x86 *cpu, const int *erratum) return false; } +DEFINE_PER_CPU_READ_MOSTLY(unsigned long, dr0_addr_mask); +DEFINE_PER_CPU_READ_MOSTLY(unsigned long, dr1_addr_mask); +DEFINE_PER_CPU_READ_MOSTLY(unsigned long, dr2_addr_mask); +DEFINE_PER_CPU_READ_MOSTLY(unsigned long, dr3_addr_mask); + void set_dr_addr_mask(unsigned long mask, int dr) { if (!boot_cpu_has(X86_FEATURE_BPEXT)) @@ -1166,17 +1171,44 @@ void set_dr_addr_mask(unsigned long mask, int dr) switch (dr) { case 0: wrmsr(MSR_F16H_DR0_ADDR_MASK, mask, 0); + per_cpu(dr0_addr_mask, smp_processor_id()) = mask; break; case 1: + wrmsr(MSR_F16H_DR1_ADDR_MASK - 1 + dr, mask, 0); + per_cpu(dr1_addr_mask, smp_processor_id()) = mask; + break; case 2: + wrmsr(MSR_F16H_DR1_ADDR_MASK - 1 + dr, mask, 0); + per_cpu(dr2_addr_mask, smp_processor_id()) = mask; + break; case 3: wrmsr(MSR_F16H_DR1_ADDR_MASK - 1 + dr, mask, 0); + per_cpu(dr3_addr_mask, smp_processor_id()) = mask; break; default: break; } } +unsigned long get_dr_addr_mask(int dr) +{ + if (!boot_cpu_has(X86_FEATURE_BPEXT)) + return 0; + + switch (dr) { + case 0: + return per_cpu(dr0_addr_mask, smp_processor_id()); + case 1: + return per_cpu(dr1_addr_mask, smp_processor_id()); + case 2: + return per_cpu(dr2_addr_mask, smp_processor_id()); + case 3: + return per_cpu(dr3_addr_mask, smp_processor_id()); + } + return 0; +} +EXPORT_SYMBOL_GPL(get_dr_addr_mask); + u32 amd_get_highest_perf(void) { struct cpuinfo_x86 *c = &boot_cpu_data;