From: Nicholas Piggin Date: Fri, 2 Aug 2019 10:56:41 +0000 (+1000) Subject: powerpc/64s/exception: machine check improve labels and comments X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=b3fe35261e329e15736bc95630fd865df9896c66;p=linux.git 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 Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20190802105709.27696-17-npiggin@gmail.com --- diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S index 3a7f18021365f..c2474c9c8d411 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