linux-kernel - [PATCH 3.4 47/99] KVM: PPC: Emulate dcbf

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Date:	Fri,  7 Mar 2014 17:07:43 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Ben Collins <ben.c@...vergy.com>,
	Alexander Graf <agraf@...e.de>,
	Ben Hutchings <ben@...adent.org.uk>,
	Qiang Huang <h.huangqiang@...wei.com>
Subject: [PATCH 3.4 47/99] KVM: PPC: Emulate dcbf

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Alexander Graf <agraf@...e.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@...vergy.com>
Signed-off-by: Alexander Graf <agraf@...e.de>
Tested-by: Ben Collins <ben.c@...vergy.com>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
Cc: Qiang Huang <h.huangqiang@...wei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 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


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