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604ea3e90b
The safe_smp_processor_id() function was originally implemented in:
dc2bc768a0 ("stack overflow safe kdump: safe_smp_processor_id()")
to mitigate the CPU number corruption on a stack overflow. At the time,
x86-32 stored the CPU number in thread_struct, which was located at the
bottom of the task stack and thus vulnerable to an overflow.
The CPU number is now located in percpu memory, so this workaround
is no longer needed.
Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Uros Bizjak <ubizjak@gmail.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Link: https://lore.kernel.org/r/20250303170115.2176553-1-brgerst@gmail.com
85 lines
2.1 KiB
C
85 lines
2.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_CPU_H
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#define _ASM_X86_CPU_H
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#include <linux/device.h>
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#include <linux/cpu.h>
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#include <linux/topology.h>
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#include <linux/nodemask.h>
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#include <linux/percpu.h>
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#include <asm/ibt.h>
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#ifndef CONFIG_SMP
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#define cpu_physical_id(cpu) boot_cpu_physical_apicid
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#define cpu_acpi_id(cpu) 0
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#endif /* CONFIG_SMP */
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#ifdef CONFIG_HOTPLUG_CPU
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extern void soft_restart_cpu(void);
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#endif
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extern void ap_init_aperfmperf(void);
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int mwait_usable(const struct cpuinfo_x86 *);
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unsigned int x86_family(unsigned int sig);
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unsigned int x86_model(unsigned int sig);
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unsigned int x86_stepping(unsigned int sig);
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#ifdef CONFIG_X86_BUS_LOCK_DETECT
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extern void __init sld_setup(struct cpuinfo_x86 *c);
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extern bool handle_user_split_lock(struct pt_regs *regs, long error_code);
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extern bool handle_guest_split_lock(unsigned long ip);
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extern void handle_bus_lock(struct pt_regs *regs);
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void split_lock_init(void);
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void bus_lock_init(void);
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#else
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static inline void __init sld_setup(struct cpuinfo_x86 *c) {}
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static inline bool handle_user_split_lock(struct pt_regs *regs, long error_code)
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{
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return false;
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}
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static inline bool handle_guest_split_lock(unsigned long ip)
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{
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return false;
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}
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static inline void handle_bus_lock(struct pt_regs *regs) {}
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static inline void split_lock_init(void) {}
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static inline void bus_lock_init(void) {}
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#endif
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#ifdef CONFIG_CPU_SUP_INTEL
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u8 get_this_hybrid_cpu_type(void);
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u32 get_this_hybrid_cpu_native_id(void);
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#else
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static inline u8 get_this_hybrid_cpu_type(void)
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{
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return 0;
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}
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static inline u32 get_this_hybrid_cpu_native_id(void)
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{
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return 0;
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}
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#endif
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#ifdef CONFIG_IA32_FEAT_CTL
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void init_ia32_feat_ctl(struct cpuinfo_x86 *c);
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#else
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static inline void init_ia32_feat_ctl(struct cpuinfo_x86 *c) {}
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#endif
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extern __noendbr void cet_disable(void);
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struct cpu_signature;
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void intel_collect_cpu_info(struct cpu_signature *sig);
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extern u64 x86_read_arch_cap_msr(void);
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bool intel_find_matching_signature(void *mc, struct cpu_signature *sig);
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int intel_microcode_sanity_check(void *mc, bool print_err, int hdr_type);
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extern struct cpumask cpus_stop_mask;
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#endif /* _ASM_X86_CPU_H */
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