diff options
author | Josh Poimboeuf <jpoimboe@redhat.com> | 2020-08-18 15:57:44 +0200 |
---|---|---|
committer | Ingo Molnar <mingo@kernel.org> | 2020-09-01 09:58:05 +0200 |
commit | e6d6c071f22de29e4993784fc00cd2202b7ba149 (patch) | |
tree | bae18c77a906997cabae12110f0c759a28856a65 /arch/x86/kernel | |
parent | 6333e8f73b834f54e395a056e6002403f0862c51 (diff) |
x86/static_call: Add out-of-line static call implementation
Add the x86 out-of-line static call implementation. For each key, a
permanent trampoline is created which is the destination for all static
calls for the given key. The trampoline has a direct jump which gets
patched by static_call_update() when the destination function changes.
[peterz: fixed trampoline, rewrote patching code]
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/20200818135804.804315175@infradead.org
Diffstat (limited to 'arch/x86/kernel')
-rw-r--r-- | arch/x86/kernel/Makefile | 1 | ||||
-rw-r--r-- | arch/x86/kernel/static_call.c | 31 |
2 files changed, 32 insertions, 0 deletions
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile index e77261db2391..de09af019e23 100644 --- a/arch/x86/kernel/Makefile +++ b/arch/x86/kernel/Makefile @@ -68,6 +68,7 @@ obj-y += tsc.o tsc_msr.o io_delay.o rtc.o obj-y += pci-iommu_table.o obj-y += resource.o obj-y += irqflags.o +obj-y += static_call.o obj-y += process.o obj-y += fpu/ diff --git a/arch/x86/kernel/static_call.c b/arch/x86/kernel/static_call.c new file mode 100644 index 000000000000..0565825970af --- /dev/null +++ b/arch/x86/kernel/static_call.c @@ -0,0 +1,31 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <linux/static_call.h> +#include <linux/memory.h> +#include <linux/bug.h> +#include <asm/text-patching.h> + +static void __static_call_transform(void *insn, u8 opcode, void *func) +{ + const void *code = text_gen_insn(opcode, insn, func); + + if (WARN_ONCE(*(u8 *)insn != opcode, + "unexpected static call insn opcode 0x%x at %pS\n", + opcode, insn)) + return; + + if (memcmp(insn, code, CALL_INSN_SIZE) == 0) + return; + + text_poke_bp(insn, code, CALL_INSN_SIZE, NULL); +} + +void arch_static_call_transform(void *site, void *tramp, void *func) +{ + mutex_lock(&text_mutex); + + if (tramp) + __static_call_transform(tramp, JMP32_INSN_OPCODE, func); + + mutex_unlock(&text_mutex); +} +EXPORT_SYMBOL_GPL(arch_static_call_transform); |