KVM: PPC: Emulate dcbf

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/powerpc/kvm/emulate.c b/arch/powerpc/kvm/emulate.c
index ee04abaefe233c89e692a9e1a84e4686d4da8030..f6ba56f471580815379c279073cb8f49a527aeaf 100644 (file)
--- 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
@@ -353,6 +354,7 @@ int kvmppc_emulate_instruction(struct kvm_run *run, struct kvm_vcpu *vcpu)
                        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