From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ben Collins , Alexander Graf , Ben Hutchings , Qiang Huang Subject: [PATCH 3.4 47/99] KVM: PPC: Emulate dcbf Date: Fri, 7 Mar 2014 17:07:43 -0800 Message-Id: <20140308010613.119029717@linuxfoundation.org> In-Reply-To: <20140308010611.468206150@linuxfoundation.org> References: <20140308010611.468206150@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Alexander Graf 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 Signed-off-by: Alexander Graf Tested-by: Ben Collins [bwh: Backported to 3.2: adjust context] Signed-off-by: Ben Hutchings Cc: Qiang Huang Signed-off-by: Greg Kroah-Hartman --- arch/powerpc/kvm/emulate.c | 2 ++ 1 file changed, 2 insertions(+) --- a/arch/powerpc/kvm/emulate.c +++ b/arch/powerpc/kvm/emulate.c @@ -36,6 +36,7 @@ #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 @@ -373,6 +374,7 @@ 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