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x86/fpu: Use EX_TYPE_FAULT_MCE_SAFE for exception fixups

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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 <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20210908132525.387464538@linutronix.de
This commit is contained in:
Thomas Gleixner 2021-09-08 15:29:23 +02:00 committed by Borislav Petkov
parent c1c97d1754
commit c6304556f3
1 changed files with 2 additions and 2 deletions
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4
arch/x86/include/asm/fpu/internal.h
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@ -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")