KVM: PPC: Emulate dcbf
authorAlexander Graf <agraf@suse.de>
Thu, 17 Jan 2013 12:50:25 +0000 (13:50 +0100)
committerAlexander Graf <agraf@suse.de>
Thu, 17 Jan 2013 23:40:49 +0000 (00:40 +0100)
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>
CC: stable@vger.kernel.org
arch/powerpc/kvm/emulate.c

index b0855e5..9d9cddc 100644 (file)
@@ -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
@@ -374,6 +375,7 @@ int kvmppc_emulate_instruction(struct kvm_run *run, struct kvm_vcpu *vcpu)
                        emulated = kvmppc_emulate_mtspr(vcpu, sprn, rs);
                        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