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/cpuflags.h | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) create mode 100644 arch/x86/boot/cpuflags.h (limited to 'arch/x86/boot/cpuflags.h') diff --git a/arch/x86/boot/cpuflags.h b/arch/x86/boot/cpuflags.h new file mode 100644 index 000000000..a398d9204 --- /dev/null +++ b/arch/x86/boot/cpuflags.h @@ -0,0 +1,27 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef BOOT_CPUFLAGS_H +#define BOOT_CPUFLAGS_H + +#include +#include + +struct cpu_features { + int level; /* Family, or 64 for x86-64 */ + int family; /* Family, always */ + int model; + u32 flags[NCAPINTS]; +}; + +extern struct cpu_features cpu; +extern u32 cpu_vendor[3]; + +#ifdef CONFIG_X86_32 +bool has_eflag(unsigned long mask); +#else +static inline bool has_eflag(unsigned long mask) { return true; } +#endif +void get_cpuflags(void); +void cpuid_count(u32 id, u32 count, u32 *a, u32 *b, u32 *c, u32 *d); +bool has_cpuflag(int flag); + +#endif -- cgit v1.3.1