]> git.baikalelectronics.ru Git - kernel.git/commit
KVM: PPC: Book3S PR: Fix software breakpoints
authorMark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Fri, 14 Jun 2019 18:57:45 +0000 (19:57 +0100)
committerPaul Mackerras <paulus@ozlabs.org>
Mon, 17 Jun 2019 06:20:43 +0000 (16:20 +1000)
commit3bda7f0ae0f786b202c0c5124c208be067acca30
tree9bbb1f8bb25bbdeb1820a82c0cf7afc0cc8cc1ea
parent0e84ec96b561d298bc9a22d58e7a4730bc408aca
KVM: PPC: Book3S PR: Fix software breakpoints

QEMU's kvm_handle_debug() function identifies software breakpoints by checking
for a value of 0 in kvm_debug_exit_arch's status field. Since this field isn't
explicitly set to 0 when the software breakpoint instruction is detected, any
previous non-zero value present causes a hang in QEMU as it tries to process
the breakpoint instruction incorrectly as a hardware breakpoint.

Ensure that the kvm_debug_exit_arch status field is set to 0 when the software
breakpoint instruction is detected (similar to the existing logic in booke.c
and e500_emulate.c) to restore software breakpoint functionality under Book3S
PR.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Fabiano Rosas <farosas@linux.ibm.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
arch/powerpc/kvm/emulate.c