summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/kvm/emulate.c
diff options
context:
space:
mode:
authorMadhavan Srinivasan <maddy@linux.vnet.ibm.com>2014-09-09 22:37:35 +0530
committerAlexander Graf <agraf@suse.de>2014-09-22 10:11:35 +0200
commita59c1d9e609c4bbad9ec3b238221ecf3b9ca091b (patch)
treeba1f264b568db3ca4ff579ccf6fe935b75d635ec /arch/powerpc/kvm/emulate.c
parentd2ca32a2d4f029b90e4b8f67879a9dfead0c85fa (diff)
downloadop-kernel-dev-a59c1d9e609c4bbad9ec3b238221ecf3b9ca091b.zip
op-kernel-dev-a59c1d9e609c4bbad9ec3b238221ecf3b9ca091b.tar.gz
powerpc/kvm: support to handle sw breakpoint
This patch adds kernel side support for software breakpoint. Design is that, by using an illegal instruction, we trap to hypervisor via Emulation Assistance interrupt, where we check for the illegal instruction and accordingly we return to Host or Guest. Patch also adds support for software breakpoint in PR KVM. Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com> Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'arch/powerpc/kvm/emulate.c')
-rw-r--r--arch/powerpc/kvm/emulate.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/powerpc/kvm/emulate.c b/arch/powerpc/kvm/emulate.c
index e96b50d..005222b 100644
--- a/arch/powerpc/kvm/emulate.c
+++ b/arch/powerpc/kvm/emulate.c
@@ -274,6 +274,21 @@ int kvmppc_emulate_instruction(struct kvm_run *run, struct kvm_vcpu *vcpu)
}
break;
+ case 0:
+ /*
+ * Instruction with primary opcode 0. Based on PowerISA
+ * these are illegal instructions.
+ */
+ if (inst == KVMPPC_INST_SW_BREAKPOINT) {
+ run->exit_reason = KVM_EXIT_DEBUG;
+ run->debug.arch.address = kvmppc_get_pc(vcpu);
+ emulated = EMULATE_EXIT_USER;
+ advance = 0;
+ } else
+ emulated = EMULATE_FAIL;
+
+ break;
+
default:
emulated = EMULATE_FAIL;
}
OpenPOWER on IntegriCloud