[ 063/128] KVM: PPC: Emulate dcbf

Ben Hutchings
2013-02-03T15:12:54Z

From: Alexander Graf <agraf@suse.de>

commit d3286144c92ec876da9e30320afa875699b7e0f1 upstream.

Guests can trigger MMIO exits using dcbf. Since we don't emulate cache
incoherent MMIO, just do nothing and move on.

Reported-by: Ben Collins <ben.c@servergy.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
Tested-by: Ben Collins <ben.c@servergy.com>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
arch/powerpc/kvm/emulate.c | 2 ++
1 file changed, 2 insertions(+)

--- a/arch/powerpc/kvm/emulate.c
+++ b/arch/powerpc/kvm/emulate.c
@@ -35,6 +35,7 @@
#define OP_TRAP_64 2

#define OP_31_XOP_LWZX 23
+#define OP_31_XOP_DCBF 86
#define OP_31_XOP_LBZX 87
#define OP_31_XOP_STWX 151
#define OP_31_XOP_STBX 215
@@ -370,6 +371,7 @@ int kvmppc_emulate_instruction(struct kv
kvmppc_set_exit_type(vcpu, EMULATED_MTSPR_EXITS);
break;

+ case OP_31_XOP_DCBF:
case OP_31_XOP_DCBI:
/* Do nothing. The guest is performing dcbi because
* hardware DMA is not snooped by the dcache, but