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| author | Borislav Petkov (AMD) <bp@alien8.de> | 2024-06-07 13:16:57 +0200 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2024-06-11 18:22:41 +0200 |
| commit | 93694129c6e84d3013f5b2787e2ff88dd706c4f0 (patch) | |
| tree | dcb45258939e9cc81ae90199d1d1c75d600b2ff7 | |
| parent | x86/alternative: Convert ALTERNATIVE_TERNARY() (diff) | |
| download | linux-93694129c6e84d3013f5b2787e2ff88dd706c4f0.tar.xz linux-93694129c6e84d3013f5b2787e2ff88dd706c4f0.zip | |
x86/alternative: Convert ALTERNATIVE_3()
Zap the hack of using an ALTERNATIVE_3() internal label, as suggested by
bgerst:
https://lore.kernel.org/r/CAMzpN2i4oJ-Dv0qO46Fd-DxNv5z9=x%2BvO%2B8g=47NiiAf8QEJYA@mail.gmail.com
in favor of a label local to this macro only, as it should be done.
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20240607111701.8366-11-bp@kernel.org
| -rw-r--r-- | arch/x86/include/asm/alternative.h | 24 | ||||
| -rw-r--r-- | arch/x86/kernel/fpu/xstate.h | 14 |
2 files changed, 9 insertions, 29 deletions
diff --git a/arch/x86/include/asm/alternative.h b/arch/x86/include/asm/alternative.h index 007baab32c14..fba12ad237e2 100644 --- a/arch/x86/include/asm/alternative.h +++ b/arch/x86/include/asm/alternative.h @@ -277,26 +277,10 @@ static inline int alternatives_text_reserved(void *start, void *end) N_ALTERNATIVE_2(oldinstr, newinstr_no, X86_FEATURE_ALWAYS, \ newinstr_yes, ft_flags) -#define ALTERNATIVE_3(oldinsn, newinsn1, ft_flags1, newinsn2, ft_flags2, \ - newinsn3, ft_flags3) \ - OLDINSTR_3(oldinsn, 1, 2, 3) \ - ".pushsection .altinstructions,\"a\"\n" \ - ALTINSTR_ENTRY(ft_flags1, 1) \ - ALTINSTR_ENTRY(ft_flags2, 2) \ - ALTINSTR_ENTRY(ft_flags3, 3) \ - ".popsection\n" \ - ".pushsection .altinstr_replacement, \"ax\"\n" \ - ALTINSTR_REPLACEMENT(newinsn1, 1) \ - ALTINSTR_REPLACEMENT(newinsn2, 2) \ - ALTINSTR_REPLACEMENT(newinsn3, 3) \ - ".popsection\n" - - -#define N_ALTERNATIVE_3(oldinst, newinst1, flag1, newinst2, flag2, \ - newinst3, flag3) \ - N_ALTERNATIVE(N_ALTERNATIVE_2(oldinst, newinst1, flag1, newinst2, flag2), \ - newinst3, flag3) - +#define ALTERNATIVE_3(oldinstr, newinstr1, ft_flags1, newinstr2, ft_flags2, \ + newinstr3, ft_flags3) \ + N_ALTERNATIVE(N_ALTERNATIVE_2(oldinstr, newinstr1, ft_flags1, newinstr2, ft_flags2), \ + newinstr3, ft_flags3) /* * Alternative instructions for different CPU types or capabilities. * diff --git a/arch/x86/kernel/fpu/xstate.h b/arch/x86/kernel/fpu/xstate.h index 05df04f39628..2ee0b9c53dcc 100644 --- a/arch/x86/kernel/fpu/xstate.h +++ b/arch/x86/kernel/fpu/xstate.h @@ -106,21 +106,17 @@ static inline u64 xfeatures_mask_independent(void) * Otherwise, if XSAVEOPT is enabled, XSAVEOPT replaces XSAVE because XSAVEOPT * supports modified optimization which is not supported by XSAVE. * - * We use XSAVE as a fallback. - * - * The 661 label is defined in the ALTERNATIVE* macros as the address of the - * original instruction which gets replaced. We need to use it here as the - * address of the instruction where we might get an exception at. + * Use XSAVE as a fallback. */ #define XSTATE_XSAVE(st, lmask, hmask, err) \ - asm volatile(ALTERNATIVE_3(XSAVE, \ + asm volatile("1: " ALTERNATIVE_3(XSAVE, \ XSAVEOPT, X86_FEATURE_XSAVEOPT, \ XSAVEC, X86_FEATURE_XSAVEC, \ XSAVES, X86_FEATURE_XSAVES) \ "\n" \ "xor %[err], %[err]\n" \ "3:\n" \ - _ASM_EXTABLE_TYPE_REG(661b, 3b, EX_TYPE_EFAULT_REG, %[err]) \ + _ASM_EXTABLE_TYPE_REG(1b, 3b, EX_TYPE_EFAULT_REG, %[err]) \ : [err] "=r" (err) \ : "D" (st), "m" (*st), "a" (lmask), "d" (hmask) \ : "memory") @@ -130,11 +126,11 @@ static inline u64 xfeatures_mask_independent(void) * XSAVE area format. */ #define XSTATE_XRESTORE(st, lmask, hmask) \ - asm volatile(ALTERNATIVE(XRSTOR, \ + asm volatile("1: " ALTERNATIVE(XRSTOR, \ XRSTORS, X86_FEATURE_XSAVES) \ "\n" \ "3:\n" \ - _ASM_EXTABLE_TYPE(661b, 3b, EX_TYPE_FPU_RESTORE) \ + _ASM_EXTABLE_TYPE(1b, 3b, EX_TYPE_FPU_RESTORE) \ : \ : "D" (st), "m" (*st), "a" (lmask), "d" (hmask) \ : "memory") |