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x86/alternatives, jump_label: Provide better text_poke() batching interface

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Adding another text_poke_bp_batch() user made me realize the interface
is all sorts of wrong. The text poke vector should be internal to the
implementation.

This then results in a trivial interface:

  text_poke_queue()  - which has the 'normal' text_poke_bp() interface
  text_poke_finish() - which takes no arguments and flushes any
                       pending text_poke()s.

Tested-by: Alexei Starovoitov <ast@kernel.org>
Tested-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
Reviewed-by: Daniel Bristot de Oliveira <bristot@redhat.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20191111132457.646280715@infradead.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra
2019-08-26 13:38:58 +02:00
committed by Ingo Molnar
parent 8f4a4160c6
commit 18cbc8bed0
3 changed files with 97 additions and 83 deletions
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15
arch/x86/include/asm/text-patching.h
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@@ -25,14 +25,6 @@ static inline void apply_paravirt(struct paravirt_patch_site *start,
*/
#define POKE_MAX_OPCODE_SIZE 5
struct text_poke_loc {
void *addr;
int len;
s32 rel32;
u8 opcode;
const u8 text[POKE_MAX_OPCODE_SIZE];
};
extern void text_poke_early(void *addr, const void *opcode, size_t len);
/*
@@ -53,9 +45,10 @@ extern void *text_poke(void *addr, const void *opcode, size_t len);
extern void *text_poke_kgdb(void *addr, const void *opcode, size_t len);
extern int poke_int3_handler(struct pt_regs *regs);
extern void text_poke_bp(void *addr, const void *opcode, size_t len, const void *emulate);
extern void text_poke_bp_batch(struct text_poke_loc *tp, unsigned int nr_entries);
extern void text_poke_loc_init(struct text_poke_loc *tp, void *addr,
const void *opcode, size_t len, const void *emulate);
extern void text_poke_queue(void *addr, const void *opcode, size_t len, const void *emulate);
extern void text_poke_finish(void);
extern int after_bootmem;
extern __ro_after_init struct mm_struct *poking_mm;
extern __ro_after_init unsigned long poking_addr;