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| author | Nicholas Piggin <npiggin@gmail.com> | 2019-08-02 12:56:41 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-08-30 02:32:36 +0200 |
| commit | b3fe35261e329e15736bc95630fd865df9896c66 (patch) | |
| tree | 54a66ae279aa75911dc350ec3ebeb8e8dd49d5f0 /arch/powerpc/kernel/exceptions-64s.S | |
| parent | powerpc/64s/exception: untangle early machine check handler branch (diff) | |
| download | linux-b3fe35261e329e15736bc95630fd865df9896c66.tar.xz linux-b3fe35261e329e15736bc95630fd865df9896c66.zip | |
powerpc/64s/exception: machine check improve labels and comments
Short forward and backward branches can be given number labels,
but larger significant divergences in code path a more readable
if they're given descriptive names.
Also adjusts a comment to account for guest delivery.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190802105709.27696-17-npiggin@gmail.com
Diffstat (limited to '')
| -rw-r--r-- | arch/powerpc/kernel/exceptions-64s.S | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S index 3a7f18021365..c2474c9c8d41 100644 --- a/arch/powerpc/kernel/exceptions-64s.S +++ b/arch/powerpc/kernel/exceptions-64s.S @@ -1052,7 +1052,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) */ lbz r11,HSTATE_IN_GUEST(r13) cmpwi r11,0 /* Check if coming from guest */ - bne 9f /* continue if we are. */ + bne mce_deliver /* continue if we are. */ #endif /* @@ -1060,7 +1060,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) * exception handler which will deliver the MC event to this kernel. */ andi. r11,r12,MSR_PR /* See if coming from user. */ - bne 9f /* continue in V mode if we are. */ + bne mce_deliver /* continue in V mode if we are. */ /* * At this point we are coming from kernel context. @@ -1088,8 +1088,14 @@ END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) MACHINE_CHECK_HANDLER_WINDUP RFI_TO_KERNEL -9: - /* Deliver the machine check to host kernel in V mode. */ +mce_deliver: + /* + * This is a host user or guest MCE. Restore all registers, then + * run the "late" handler. For host user, this will run the + * machine_check_exception handler in virtual mode like a normal + * interrupt handler. For guest, this will trigger the KVM test + * and branch to the KVM interrupt similarly to other interrupts. + */ BEGIN_FTR_SECTION ld r10,ORIG_GPR3(r1) mtspr SPRN_CFAR,r10 |