From 119e9db233ad0f4cbd4cfb9f9385a7bca378b37d Mon Sep 17 00:00:00 2001 From: Zeng Chi Date: Mon, 21 Sep 2026 18:24:42 +0800 Subject: KVM: Don't pre-reserve xarray entries when storing empty/NULL attributes Skip the xarray reservation loop when clearing all memory attributes, as storing NULL only erases the entry and never needs to allocate, so no reservation (and no cleanup of a failed one) is required in that case. Suggested-by: Sean Christopherson Cc: David Ballesteros Signed-off-by: Zeng Chi Link: https://patch.msgid.link/20260921102442.1232375-1-zeng_chi911@163.com [sean: split to separate patch] Signed-off-by: Sean Christopherson --- arch/x86/boot/setup.ld | 74 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 74 insertions(+) create mode 100644 arch/x86/boot/setup.ld (limited to 'arch/x86/boot/setup.ld') diff --git a/arch/x86/boot/setup.ld b/arch/x86/boot/setup.ld new file mode 100644 index 000000000..e1d594a60 --- /dev/null +++ b/arch/x86/boot/setup.ld @@ -0,0 +1,74 @@ +/* + * setup.ld + * + * Linker script for the i386 setup code + */ +OUTPUT_FORMAT("elf32-i386") +OUTPUT_ARCH(i386) +ENTRY(_start) + +SECTIONS +{ + . = 0; + .bstext : { + *(.bstext) + . = 495; + } =0xffffffff + + .header : { *(.header) } + .entrytext : { *(.entrytext) } + .inittext : { *(.inittext) } + .initdata : { *(.initdata) } + __end_init = .; + + .text : { *(.text .text.*) } + .text32 : { *(.text32) } + + .pecompat : { *(.pecompat) } + PROVIDE(pecompat_fsize = setup_size - pecompat_fstart); + + . = ALIGN(16); + .rodata : { *(.rodata*) } + + .videocards : { + video_cards = .; + *(.videocards) + video_cards_end = .; + } + + . = ALIGN(16); + .data : { *(.data*) } + + .signature : { + setup_sig = .; + LONG(0x5a5aaa55) + + setup_size = ALIGN(ABSOLUTE(.), 4096); + setup_sects = ABSOLUTE(setup_size / 512); + ASSERT(setup_sects >= 5, "The setup must be at least 5 sectors in size"); + ASSERT(setup_sects <= 64, "The setup must be at most 64 sectors in size"); + } + + . = ALIGN(16); + .bss : + { + __bss_start = .; + *(.bss) + __bss_end = .; + } + . = ALIGN(16); + _end = .; + + /DISCARD/ : { + *(.note*) + } + + /* + * The ASSERT() sink to . is intentional, for binutils 2.14 compatibility: + */ + . = ASSERT(_end <= 0x8000, "Setup too big!"); + . = ASSERT(hdr == 0x1f1, "The setup header has the wrong offset!"); + /* Necessary for the very-old-loader check to work... */ + . = ASSERT(__end_init <= 5*512, "init sections too big!"); + +} -- cgit v1.3.1