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 <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
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 ce6fc4f8d1d115b979a88351336336ce52e3df68..cb1ca602e8489854d94893bfe4bd0e36765ddaf5 100644 (file)
--- 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")