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pr=C From: Michal Orzel To: CC: Michal Orzel , Stefano Stabellini , Julien Grall , Bertrand Marquis , Volodymyr Babchuk Subject: [PATCH 1/2] xen/arm: Drop {boot_}phys_offset usage Date: Wed, 14 Aug 2024 11:43:02 +0200 Message-ID: <20240814094303.23611-2-michal.orzel@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240814094303.23611-1-michal.orzel@amd.com> References: <20240814094303.23611-1-michal.orzel@amd.com> MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SA2PEPF00003AE6:EE_|SJ2PR12MB7848:EE_ X-MS-Office365-Filtering-Correlation-Id: c9c49482-f50c-4d68-7074-08dcbc4582ec X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|36860700013|376014|82310400026; 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:(13230040)(1800799024)(36860700013)(376014)(82310400026);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Aug 2024 09:43:11.4128 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c9c49482-f50c-4d68-7074-08dcbc4582ec 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: SA2PEPF00003AE6.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR12MB7848 boot_phys_offset stores the physical offset (PA-VA), is calculated in the startup head.S code and passed to start_xen() as a first argument. There is no point in using it given that we can ask MMU to translate a VA for us using e.g. virt_to_{mfn,maddr}. Drop usage of these variables from the C world. Signed-off-by: Michal Orzel Acked-by: Julien Grall --- It should also simplify the LLC coloring last patch: https://lore.kernel.org/xen-devel/20240502165533.319988-14-carlo.nonato@minervasys.tech/ --- xen/arch/arm/include/asm/mm.h | 2 +- xen/arch/arm/mmu/setup.c | 16 ++++++---------- xen/arch/arm/setup.c | 2 +- 3 files changed, 8 insertions(+), 12 deletions(-) diff --git a/xen/arch/arm/include/asm/mm.h b/xen/arch/arm/include/asm/mm.h index f6ba611f01f7..5abd4b0d1c73 100644 --- a/xen/arch/arm/include/asm/mm.h +++ b/xen/arch/arm/include/asm/mm.h @@ -199,7 +199,7 @@ extern unsigned long frametable_base_pdx; #define PDX_GROUP_SHIFT SECOND_SHIFT /* Boot-time pagetable setup */ -extern void setup_pagetables(unsigned long boot_phys_offset); +extern void setup_pagetables(void); /* Map FDT in boot pagetable */ extern void *early_fdt_map(paddr_t fdt_paddr); /* Remove early mappings */ diff --git a/xen/arch/arm/mmu/setup.c b/xen/arch/arm/mmu/setup.c index 57042ed57b4a..9664e85ee6c0 100644 --- a/xen/arch/arm/mmu/setup.c +++ b/xen/arch/arm/mmu/setup.c @@ -17,6 +17,8 @@ /* Override macros from asm/page.h to make them work with mfn_t */ #undef mfn_to_virt #define mfn_to_virt(mfn) __mfn_to_virt(mfn_x(mfn)) +#undef virt_to_mfn +#define virt_to_mfn(va) _mfn(__virt_to_mfn(va)) /* Main runtime page tables */ @@ -52,8 +54,6 @@ DEFINE_BOOT_PAGE_TABLE(xen_fixmap); */ static DEFINE_PAGE_TABLES(xen_xenmap, XEN_NR_ENTRIES(2)); -static paddr_t phys_offset; - /* Limits of the Xen heap */ mfn_t directmap_mfn_start __read_mostly = INVALID_MFN_INITIALIZER; mfn_t directmap_mfn_end __read_mostly; @@ -138,9 +138,7 @@ static void __init __maybe_unused build_assertions(void) lpae_t __init pte_of_xenaddr(vaddr_t va) { - paddr_t ma = va + phys_offset; - - return mfn_to_xen_entry(maddr_to_mfn(ma), MT_NORMAL); + return mfn_to_xen_entry(virt_to_mfn(va), MT_NORMAL); } void * __init early_fdt_map(paddr_t fdt_paddr) @@ -228,14 +226,12 @@ static void xen_pt_enforce_wnx(void) * Boot-time pagetable setup. * Changes here may need matching changes in head.S */ -void __init setup_pagetables(unsigned long boot_phys_offset) +void __init setup_pagetables(void) { uint64_t ttbr; lpae_t pte, *p; int i; - phys_offset = boot_phys_offset; - arch_setup_page_tables(); #ifdef CONFIG_ARM_64 @@ -290,9 +286,9 @@ void __init setup_pagetables(unsigned long boot_phys_offset) xen_second[second_table_offset(FIXMAP_ADDR(0))] = pte; #ifdef CONFIG_ARM_64 - ttbr = (uintptr_t) xen_pgtable + phys_offset; + ttbr = virt_to_maddr(xen_pgtable); #else - ttbr = (uintptr_t) cpu0_pgtable + phys_offset; + ttbr = virt_to_maddr(cpu0_pgtable); #endif switch_ttbr(ttbr); diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c index cb2c0a16b824..cfe19e15b0be 100644 --- a/xen/arch/arm/setup.c +++ b/xen/arch/arm/setup.c @@ -304,7 +304,7 @@ void asmlinkage __init start_xen(unsigned long boot_phys_offset, /* Initialize traps early allow us to get backtrace when an error occurred */ init_traps(); - setup_pagetables(boot_phys_offset); + setup_pagetables(); smp_clear_cpu_maps(); From patchwork Wed Aug 14 09:43:03 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michal Orzel X-Patchwork-Id: 13763182 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 3AC00C531DC for ; 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h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=/KSw71JxdXit9FabNCWRoEsweJcGEQpXx+neZF5JHpw=; b=Fq/redV3mqWGjtlIjb1g+BSnJwgAZyZioPMZ0CrppCZzUb7a1fpLcZDlGOly8pMIgXXnMYJgYOCJzu7eNQIgzFqdiQHatPENQjgVotGJfULgrD9g4lrmP+ubwwW+kbabIeUWyRC6+RDmrbOD9wXlE/sabikN0c4JzY6G0SEzVYk= X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB03.amd.com; pr=C From: Michal Orzel To: CC: Michal Orzel , Stefano Stabellini , Julien Grall , Bertrand Marquis , Volodymyr Babchuk Subject: [PATCH 2/2] xen/arm: head: Do not pass physical offset to start_xen Date: Wed, 14 Aug 2024 11:43:03 +0200 Message-ID: <20240814094303.23611-3-michal.orzel@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240814094303.23611-1-michal.orzel@amd.com> References: <20240814094303.23611-1-michal.orzel@amd.com> MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH1PEPF0000AD74:EE_|DM4PR12MB6182:EE_ X-MS-Office365-Filtering-Correlation-Id: ee0edfc1-42ce-494b-15ec-08dcbc4583d4 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|82310400026|376014|36860700013; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Aug 2024 09:43:12.9466 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: ee0edfc1-42ce-494b-15ec-08dcbc4583d4 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=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CH1PEPF0000AD74.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB6182 Given no further use in C world of boot_phys_offset, drop it from the argument list of start_xen() and do the necessary changes in the startup code head.S (most notably modifying launch not to expect 2 arguments to pass to C entry point). Both on arm64 and arm32, phys offset (stored in x20 or r10 respectively) is still needed, so that it can be used in e.g. create_table_entry, therefore keep it on the list of common register usage. Signed-off-by: Michal Orzel Acked-by: Julien Grall --- xen/arch/arm/arm32/head.S | 12 +++++------- xen/arch/arm/arm64/head.S | 12 +++++------- xen/arch/arm/setup.c | 3 +-- 3 files changed, 11 insertions(+), 16 deletions(-) diff --git a/xen/arch/arm/arm32/head.S b/xen/arch/arm/arm32/head.S index b488a21a71ba..a96d5d35038f 100644 --- a/xen/arch/arm/arm32/head.S +++ b/xen/arch/arm/arm32/head.S @@ -101,9 +101,8 @@ primary_switched: bl zero_bss PRINT("- Ready -\r\n") /* Setup the arguments for start_xen and jump to C world */ - mov r0, r10 /* r0 := Physical offset */ - mov r1, r8 /* r1 := paddr(FDT) */ - mov_w r2, start_xen + mov r0, r8 /* r0 := paddr(FDT) */ + mov_w r1, start_xen b launch ENDPROC(start) @@ -141,7 +140,7 @@ GLOBAL(init_secondary) secondary_switched: PRINT("- Ready -\r\n") /* Jump to C world */ - mov_w r2, start_secondary + mov_w r1, start_secondary b launch ENDPROC(init_secondary) @@ -243,8 +242,7 @@ ENDPROC(cpu_init) * * Inputs: * r0 : Argument 0 of the C function to call - * r1 : Argument 1 of the C function to call - * r2 : C entry point + * r1 : C entry point * * Clobbers r3 */ @@ -256,7 +254,7 @@ launch: sub sp, #CPUINFO_sizeof /* Make room for CPU save record */ /* Jump to C world */ - bx r2 + bx r1 ENDPROC(launch) /* Fail-stop */ diff --git a/xen/arch/arm/arm64/head.S b/xen/arch/arm/arm64/head.S index 2fa07dc3a04b..14c3720d80f8 100644 --- a/xen/arch/arm/arm64/head.S +++ b/xen/arch/arm/arm64/head.S @@ -260,9 +260,8 @@ primary_switched: bl zero_bss PRINT("- Ready -\r\n") /* Setup the arguments for start_xen and jump to C world */ - mov x0, x20 /* x0 := Physical offset */ - mov x1, x21 /* x1 := paddr(FDT) */ - ldr x2, =start_xen + mov x0, x21 /* x0 := paddr(FDT) */ + ldr x1, =start_xen b launch END(real_start) @@ -303,7 +302,7 @@ FUNC(init_secondary) secondary_switched: PRINT("- Ready -\r\n") /* Jump to C world */ - ldr x2, =start_secondary + ldr x1, =start_secondary b launch END(init_secondary) @@ -407,8 +406,7 @@ END(cpu_init) * * Inputs: * x0 : Argument 0 of the C function to call - * x1 : Argument 1 of the C function to call - * x2 : C entry point + * x1 : C entry point * * Clobbers x3 */ @@ -421,7 +419,7 @@ FUNC_LOCAL(launch) mov sp, x3 /* Jump to C world */ - br x2 + br x1 END(launch) /* Fail-stop */ diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c index cfe19e15b0be..961d3ea6700b 100644 --- a/xen/arch/arm/setup.c +++ b/xen/arch/arm/setup.c @@ -287,8 +287,7 @@ void __init init_pdx(void) size_t __read_mostly dcache_line_bytes; /* C entry point for boot CPU */ -void asmlinkage __init start_xen(unsigned long boot_phys_offset, - unsigned long fdt_paddr) +void asmlinkage __init start_xen(unsigned long fdt_paddr) { size_t fdt_size; const char *cmdline;