From: Ard Biesheuvel <ardb+git@google.com>
To: linux-kernel@vger.kernel.org
Cc: Ard Biesheuvel <ardb@kernel.org>,
Kevin Loughlin <kevinloughlin@google.com>,
Tom Lendacky <thomas.lendacky@amd.com>,
Dionna Glaze <dionnaglaze@google.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
Andy Lutomirski <luto@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
Nathan Chancellor <nathan@kernel.org>,
Nick Desaulniers <ndesaulniers@google.com>,
Justin Stitt <justinstitt@google.com>,
Kees Cook <keescook@chromium.org>,
Brian Gerst <brgerst@gmail.com>,
linux-arch@vger.kernel.org, llvm@lists.linux.dev
Subject: [PATCH v5 05/16] x86/startup_64: Use RIP_REL_REF() to access early page tables
Date: Wed, 21 Feb 2024 12:35:12 +0100 [thread overview]
Message-ID: <20240221113506.2565718-23-ardb+git@google.com> (raw)
In-Reply-To: <20240221113506.2565718-18-ardb+git@google.com>
From: Ard Biesheuvel <ardb@kernel.org>
The early statically allocated page tables are populated from code that
executes from a 1:1 mapping so it cannot use plain accesses from C.
Replace the use of fixup_pointer() with RIP_REL_REF(), which is better
and simpler.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
arch/x86/kernel/head64.c | 10 ++++------
1 file changed, 4 insertions(+), 6 deletions(-)
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index e2573ddae32f..7e2c9b581d58 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -215,13 +215,11 @@ unsigned long __head __startup_64(unsigned long physaddr,
p4d[511] += load_delta;
}
- pud = fixup_pointer(level3_kernel_pgt, physaddr);
- pud[510] += load_delta;
- pud[511] += load_delta;
+ RIP_REL_REF(level3_kernel_pgt)[PTRS_PER_PUD - 2].pud += load_delta;
+ RIP_REL_REF(level3_kernel_pgt)[PTRS_PER_PUD - 1].pud += load_delta;
- pmd = fixup_pointer(level2_fixmap_pgt, physaddr);
for (i = FIXMAP_PMD_TOP; i > FIXMAP_PMD_TOP - FIXMAP_PMD_NUM; i--)
- pmd[i] += load_delta;
+ RIP_REL_REF(level2_fixmap_pgt)[i].pmd += load_delta;
/*
* Set up the identity mapping for the switchover. These
@@ -284,7 +282,7 @@ unsigned long __head __startup_64(unsigned long physaddr,
* error, causing the BIOS to halt the system.
*/
- pmd = fixup_pointer(level2_kernel_pgt, physaddr);
+ pmd = &RIP_REL_REF(level2_kernel_pgt)->pmd;
/* invalidate pages before the kernel image */
for (i = 0; i < pmd_index((unsigned long)_text); i++)
--
2.44.0.rc0.258.g7320e95886-goog
next prev parent reply other threads:[~2024-02-21 11:35 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-21 11:35 [PATCH v5 00/16] x86: Confine early 1:1 mapped startup code Ard Biesheuvel
2024-02-21 11:35 ` [PATCH v5 01/16] x86/startup_64: Simplify global variable accesses in GDT/IDT programming Ard Biesheuvel
2024-02-26 12:12 ` [tip: x86/boot] x86/boot/64: " tip-bot2 for Ard Biesheuvel
2024-02-21 11:35 ` [PATCH v5 02/16] x86/startup_64: Use RIP_REL_REF() to assign phys_base Ard Biesheuvel
2024-02-26 12:12 ` [tip: x86/boot] x86/boot/64: Use RIP_REL_REF() to assign 'phys_base' tip-bot2 for Ard Biesheuvel
2024-02-21 11:35 ` [PATCH v5 03/16] x86/startup_64: Use RIP_REL_REF() to access early_dynamic_pgts[] Ard Biesheuvel
2024-02-26 12:12 ` [tip: x86/boot] x86/boot/64: " tip-bot2 for Ard Biesheuvel
2024-02-21 11:35 ` [PATCH v5 04/16] x86/startup_64: Use RIP_REL_REF() to access __supported_pte_mask Ard Biesheuvel
2024-02-26 12:12 ` [tip: x86/boot] x86/boot/64: Use RIP_REL_REF() to access '__supported_pte_mask' tip-bot2 for Ard Biesheuvel
2024-02-21 11:35 ` Ard Biesheuvel [this message]
2024-02-26 12:12 ` [tip: x86/boot] x86/boot/64: Use RIP_REL_REF() to access early page tables tip-bot2 for Ard Biesheuvel
2024-02-21 11:35 ` [PATCH v5 06/16] x86/startup_64: Use RIP_REL_REF() to access early_top_pgt[] Ard Biesheuvel
2024-02-26 12:12 ` [tip: x86/boot] x86/boot/64: " tip-bot2 for Ard Biesheuvel
2024-02-21 11:35 ` [PATCH v5 07/16] x86/startup_64: Simplify CR4 handling in startup code Ard Biesheuvel
2024-02-21 14:52 ` Brian Gerst
2024-02-21 11:35 ` [PATCH v5 08/16] x86/startup_64: Defer assignment of 5-level paging global variables Ard Biesheuvel
2024-02-21 11:35 ` [PATCH v5 09/16] x86/startup_64: Simplify calculation of initial page table address Ard Biesheuvel
2024-02-21 11:35 ` [PATCH v5 10/16] x86/startup_64: Simplify virtual switch on primary boot Ard Biesheuvel
2024-02-23 13:11 ` Ard Biesheuvel
2024-02-21 11:35 ` [PATCH v5 11/16] x86/sme: Avoid SME/SVE related checks on non-SME/SVE platforms Ard Biesheuvel
2024-02-21 11:35 ` [PATCH v5 12/16] efi/libstub: Add generic support for parsing mem_encrypt= Ard Biesheuvel
2024-02-21 11:35 ` [PATCH v5 13/16] x86/boot: Move mem_encrypt= parsing to the decompressor Ard Biesheuvel
2024-02-21 11:35 ` [PATCH v5 14/16] x86/sme: Move early SME kernel encryption handling into .head.text Ard Biesheuvel
2024-02-21 11:35 ` [PATCH v5 15/16] x86/sev: Move early startup code into .head.text section Ard Biesheuvel
2024-02-21 11:35 ` [PATCH v5 16/16] x86/startup_64: Drop global variables keeping track of LA57 state Ard Biesheuvel
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