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David Alan Gilbert" , , , , Subject: [PATCH v12 05/46] x86/boot: Introduce helpers for MSR reads/writes Date: Mon, 7 Mar 2022 15:33:15 -0600 Message-ID: <20220307213356.2797205-6-brijesh.singh@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220307213356.2797205-1-brijesh.singh@amd.com> References: <20220307213356.2797205-1-brijesh.singh@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain 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-Office365-Filtering-Correlation-Id: d7a1070b-8724-461b-60c5-08da0082461e X-MS-TrafficTypeDiagnostic: MN2PR12MB3359: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)(40470700004)(46966006)(36840700001)(47076005)(36860700001)(36756003)(7696005)(2616005)(83380400001)(2906002)(7406005)(7416002)(5660300002)(40460700003)(316002)(26005)(54906003)(82310400004)(8936002)(81166007)(70206006)(70586007)(44832011)(336012)(426003)(356005)(86362001)(186003)(1076003)(6666004)(16526019)(8676002)(4326008)(110136005)(508600001)(36900700001)(2101003);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Mar 2022 21:34:34.7397 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d7a1070b-8724-461b-60c5-08da0082461e 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: BN8NAM11FT029.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB3359 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Michael Roth The current set of helpers used throughout the run-time kernel have dependencies on code/facilities outside of the boot kernel, so there are a number of call-sites throughout the boot kernel where inline assembly is used instead. More will be added with subsequent patches that add support for SEV-SNP, so take the opportunity to provide a basic set of helpers that can be used by the boot kernel to reduce reliance on inline assembly. Use boot_* prefix so that it's clear these are helpers specific to the boot kernel to avoid any confusion with the various other MSR read/write helpers. Suggested-by: Borislav Petkov Signed-off-by: Michael Roth --- arch/x86/boot/msr.h | 28 ++++++++++++++++++++++++++++ arch/x86/include/asm/msr.h | 11 +---------- arch/x86/include/asm/shared/msr.h | 15 +++++++++++++++ 3 files changed, 44 insertions(+), 10 deletions(-) create mode 100644 arch/x86/boot/msr.h create mode 100644 arch/x86/include/asm/shared/msr.h diff --git a/arch/x86/boot/msr.h b/arch/x86/boot/msr.h new file mode 100644 index 000000000000..b6bb2161da27 --- /dev/null +++ b/arch/x86/boot/msr.h @@ -0,0 +1,28 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Helpers/definitions related to MSR access. + */ + +#ifndef BOOT_MSR_H +#define BOOT_MSR_H + +#include + +/* + * The kernel proper already defines rdmsr()/wrmsr(), but they are not for the + * boot kernel since they rely tracepoint/exception handling infrastructure + * that's not available here, hence these boot_{rd,wr}msr helpers which serve + * the singular purpose of wrapping the RDMSR/WRMSR instructions to reduce the + * need for inline assembly calls throughout the boot kernel code. + */ +static inline void boot_rdmsr(unsigned int msr, struct msr *m) +{ + asm volatile("rdmsr" : "=a" (m->l), "=d" (m->h) : "c" (msr)); +} + +static inline void boot_wrmsr(unsigned int msr, const struct msr *m) +{ + asm volatile("wrmsr" : : "c" (msr), "a"(m->l), "d" (m->h) : "memory"); +} + +#endif /* BOOT_MSR_H */ diff --git a/arch/x86/include/asm/msr.h b/arch/x86/include/asm/msr.h index d42e6c6b47b1..65ec1965cd28 100644 --- a/arch/x86/include/asm/msr.h +++ b/arch/x86/include/asm/msr.h @@ -10,16 +10,7 @@ #include #include #include - -struct msr { - union { - struct { - u32 l; - u32 h; - }; - u64 q; - }; -}; +#include struct msr_info { u32 msr_no; diff --git a/arch/x86/include/asm/shared/msr.h b/arch/x86/include/asm/shared/msr.h new file mode 100644 index 000000000000..1e6ec10b3a15 --- /dev/null +++ b/arch/x86/include/asm/shared/msr.h @@ -0,0 +1,15 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_X86_SHARED_MSR_H +#define _ASM_X86_SHARED_MSR_H + +struct msr { + union { + struct { + u32 l; + u32 h; + }; + u64 q; + }; +}; + +#endif /* _ASM_X86_SHARED_MSR_H */ -- 2.25.1