From b3464a36f7f2499d517e8334e07ddd6eefcd67c1 Mon Sep 17 00:00:00 2001 From: Ard Biesheuvel Date: Sun, 4 May 2025 11:52:32 +0200 Subject: [PATCH] x86/boot: Disregard __supported_pte_mask in __startup_64() __supported_pte_mask is statically initialized to U64_MAX and never assigned until long after the startup code executes that creates the initial page tables. So applying the mask is unnecessary, and can be avoided. Signed-off-by: Ard Biesheuvel Signed-off-by: Ingo Molnar Cc: Arnd Bergmann Cc: David Woodhouse Cc: Dionna Amalie Glaze Cc: H. Peter Anvin Cc: Kees Cook Cc: Kevin Loughlin Cc: Len Brown Cc: Linus Torvalds Cc: Rafael J. Wysocki Cc: Tom Lendacky Cc: linux-efi@vger.kernel.org Link: https://lore.kernel.org/r/20250504095230.2932860-27-ardb+git@google.com --- arch/x86/boot/startup/map_kernel.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/arch/x86/boot/startup/map_kernel.c b/arch/x86/boot/startup/map_kernel.c index 0eac3f17dbd3f..099ae25593361 100644 --- a/arch/x86/boot/startup/map_kernel.c +++ b/arch/x86/boot/startup/map_kernel.c @@ -179,8 +179,6 @@ unsigned long __head __startup_64(unsigned long p2v_offset, pud[(i + 1) % PTRS_PER_PUD] = (pudval_t)pmd + pgtable_flags; pmd_entry = __PAGE_KERNEL_LARGE_EXEC & ~_PAGE_GLOBAL; - /* Filter out unsupported __PAGE_KERNEL_* bits: */ - pmd_entry &= __supported_pte_mask; pmd_entry += sme_get_me_mask(); pmd_entry += physaddr; -- 2.47.2