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Merge tag 'x86-fred-2024-09-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull x86 FRED updates from Thomas Gleixner:

 - Enable FRED right after init_mem_mapping() because at that point the
   early IDT fault handler is replaced by the real fault handler. The
   real fault handler retrieves the faulting address from the stack
   frame and not from CR2 when the FRED feature is set. But that
   obviously only works when FRED is enabled in the CPU as well.

 - Set SS to __KERNEL_DS when enabling FRED to prevent a corner case
   where ERETS can observe a SS mismatch and raises a #GP.

* tag 'x86-fred-2024-09-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/entry: Set FRED RSP0 on return to userspace instead of context switch
  x86/msr: Switch between WRMSRNS and WRMSR with the alternatives mechanism
  x86/entry: Test ti_work for zero before processing individual bits
  x86/fred: Set SS to __KERNEL_DS when enabling FRED
  x86/fred: Enable FRED right after init_mem_mapping()
  x86/fred: Move FRED RSP initialization into a separate function
  x86/fred: Parse cmdline param "fred=" in cpu_parse_early_param()
This commit is contained in:
Linus Torvalds
2024-09-17 14:55:59 +02:00
parent c3056a7d14 fe85ee3919
commit b136021126
11 changed files with 111 additions and 64 deletions
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3
arch/x86/include/asm/processor.h
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@@ -582,7 +582,8 @@ extern void switch_gdt_and_percpu_base(int);
extern void load_direct_gdt(int);
extern void load_fixmap_gdt(int);
extern void cpu_init(void);
extern void cpu_init_exception_handling(void);
extern void cpu_init_exception_handling(bool boot_cpu);
extern void cpu_init_replace_early_idt(void);
extern void cr4_init(void);
extern void set_task_blockstep(struct task_struct *task, bool on);