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David Alan Gilbert" , , , , Subject: [PATCH v12 36/46] x86/compressed: Export and rename add_identity_map() Date: Mon, 7 Mar 2022 15:33:46 -0600 Message-ID: <20220307213356.2797205-37-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: c445c3bd-609f-4a8d-295c-08da008263f5 X-MS-TrafficTypeDiagnostic: MW4PR12MB5603: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)(36840700001)(40470700004)(4326008)(70586007)(70206006)(2906002)(8676002)(36756003)(508600001)(7696005)(6666004)(336012)(1076003)(82310400004)(426003)(186003)(26005)(16526019)(36860700001)(2616005)(316002)(54906003)(110136005)(356005)(86362001)(83380400001)(44832011)(81166007)(47076005)(5660300002)(7406005)(40460700003)(8936002)(7416002)(2101003)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Mar 2022 21:35:24.8325 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c445c3bd-609f-4a8d-295c-08da008263f5 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: BN8NAM11FT005.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR12MB5603 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Michael Roth SEV-specific code will need to add some additional mappings, but doing this within ident_map_64.c requires some SEV-specific helpers to be exported and some SEV-specific struct definitions to be pulled into ident_map_64.c. Instead, export add_identity_map() so SEV-specific (and other subsystem-specific) code can be better contained outside of ident_map_64.c. While at it, rename the function to kernel_add_identity_map(), similar to the kernel_ident_mapping_init() function it relies upon. No functional changes. Suggested-by: Borislav Petkov Signed-off-by: Michael Roth --- arch/x86/boot/compressed/ident_map_64.c | 18 +++++++++--------- arch/x86/boot/compressed/misc.h | 1 + 2 files changed, 10 insertions(+), 9 deletions(-) diff --git a/arch/x86/boot/compressed/ident_map_64.c b/arch/x86/boot/compressed/ident_map_64.c index 3d566964b829..7975680f521f 100644 --- a/arch/x86/boot/compressed/ident_map_64.c +++ b/arch/x86/boot/compressed/ident_map_64.c @@ -90,7 +90,7 @@ static struct x86_mapping_info mapping_info; /* * Adds the specified range to the identity mappings. */ -static void add_identity_map(unsigned long start, unsigned long end) +void kernel_add_identity_map(unsigned long start, unsigned long end) { int ret; @@ -157,11 +157,11 @@ void initialize_identity_maps(void *rmode) * explicitly here in case the compressed kernel does not touch them, * or does not touch all the pages covering them. */ - add_identity_map((unsigned long)_head, (unsigned long)_end); + kernel_add_identity_map((unsigned long)_head, (unsigned long)_end); boot_params = rmode; - add_identity_map((unsigned long)boot_params, (unsigned long)(boot_params + 1)); + kernel_add_identity_map((unsigned long)boot_params, (unsigned long)(boot_params + 1)); cmdline = get_cmd_line_ptr(); - add_identity_map(cmdline, cmdline + COMMAND_LINE_SIZE); + kernel_add_identity_map(cmdline, cmdline + COMMAND_LINE_SIZE); /* Load the new page-table. */ sev_verify_cbit(top_level_pgt); @@ -246,10 +246,10 @@ static int set_clr_page_flags(struct x86_mapping_info *info, * It should already exist, but keep things generic. * * To map the page just read from it and fault it in if there is no - * mapping yet. add_identity_map() can't be called here because that - * would unconditionally map the address on PMD level, destroying any - * PTE-level mappings that might already exist. Use assembly here so - * the access won't be optimized away. + * mapping yet. kernel_add_identity_map() can't be called here because + * that would unconditionally map the address on PMD level, destroying + * any PTE-level mappings that might already exist. Use assembly here + * so the access won't be optimized away. */ asm volatile("mov %[address], %%r9" :: [address] "g" (*(unsigned long *)address) @@ -363,5 +363,5 @@ void do_boot_page_fault(struct pt_regs *regs, unsigned long error_code) * Error code is sane - now identity map the 2M region around * the faulting address. */ - add_identity_map(address, end); + kernel_add_identity_map(address, end); } diff --git a/arch/x86/boot/compressed/misc.h b/arch/x86/boot/compressed/misc.h index ba538af37e90..aae2722c6e9a 100644 --- a/arch/x86/boot/compressed/misc.h +++ b/arch/x86/boot/compressed/misc.h @@ -156,6 +156,7 @@ static inline int count_immovable_mem_regions(void) { return 0; } #ifdef CONFIG_X86_5LEVEL extern unsigned int __pgtable_l5_enabled, pgdir_shift, ptrs_per_p4d; #endif +extern void kernel_add_identity_map(unsigned long start, unsigned long end); /* Used by PAGE_KERN* macros: */ extern pteval_t __default_kernel_pte_mask; -- 2.25.1