[PATCH 14/93] KVM: PPC: Emulate dcbf

Herton Ronaldo Krzesinski herton.krzesinski at canonical.com
Tue Feb 5 22:06:03 UTC 2013 -stable review patch.  If anyone has any objections, please let me know.


From: Alexander Graf <agraf at 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 at servergy.com>
Signed-off-by: Alexander Graf <agraf at suse.de>
Tested-by: Ben Collins <ben.c at servergy.com>
[ herton: adjust context ]
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski at canonical.com>
 arch/powerpc/kvm/emulate.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/powerpc/kvm/emulate.c b/arch/powerpc/kvm/emulate.c
index f90e86d..d382c91 100644
--- a/arch/powerpc/kvm/emulate.c
+++ b/arch/powerpc/kvm/emulate.c
@@ -39,6 +39,7 @@
 #define OP_31_XOP_TRAP      4
 #define OP_31_XOP_LWZX      23
 #define OP_31_XOP_TRAP_64   68
+#define OP_31_XOP_DCBF      86
 #define OP_31_XOP_LBZX      87
 #define OP_31_XOP_STWX      151
 #define OP_31_XOP_STBX      215
@@ -351,6 +352,7 @@ int kvmppc_emulate_instruction(struct kvm_run *run, struct kvm_vcpu *vcpu)
 			kvmppc_set_exit_type(vcpu, EMULATED_MTSPR_EXITS);
+		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

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