From: Thomas Gleixner Date: Wed, 8 Sep 2021 13:29:23 +0000 (+0200) Subject: x86/fpu: Use EX_TYPE_FAULT_MCE_SAFE for exception fixups X-Git-Tag: v5.16-rc1~195^2~103 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=c6304556f3ae98c943bbb4042a30205c98e4f921;p=thirdparty%2Flinux.git x86/fpu: Use EX_TYPE_FAULT_MCE_SAFE for exception fixups The macros used for restoring FPU state from a user space buffer can handle all exceptions including #MC. They need to return the trap number in the error case as the code which invokes them needs to distinguish the cause of the failure. It aborts the operation for anything except #PF. Use the new EX_TYPE_FAULT_MCE_SAFE exception table fixup type to document the nature of the fixup. Signed-off-by: Thomas Gleixner Signed-off-by: Borislav Petkov Link: https://lkml.kernel.org/r/20210908132525.387464538@linutronix.de --- diff --git a/arch/x86/include/asm/fpu/internal.h b/arch/x86/include/asm/fpu/internal.h index ce6fc4f8d1d11..cb1ca602e8489 100644 --- a/arch/x86/include/asm/fpu/internal.h +++ b/arch/x86/include/asm/fpu/internal.h @@ -102,7 +102,7 @@ extern void save_fpregs_to_fpstate(struct fpu *fpu); "3: negl %%eax\n" \ " jmp 2b\n" \ ".previous\n" \ - _ASM_EXTABLE_FAULT(1b, 3b) \ + _ASM_EXTABLE_TYPE(1b, 3b, EX_TYPE_FAULT_MCE_SAFE) \ : [err] "=a" (err), output \ : "0"(0), input); \ err; \ @@ -209,7 +209,7 @@ static inline void fxsave(struct fxregs_state *fx) "3: negl %%eax\n\t" \ "jmp 2b\n\t" \ ".popsection\n\t" \ - _ASM_EXTABLE_FAULT(1b, 3b) \ + _ASM_EXTABLE_TYPE(1b, 3b, EX_TYPE_FAULT_MCE_SAFE) \ : [err] "=a" (err) \ : "D" (st), "m" (*st), "a" (lmask), "d" (hmask) \ : "memory")