linux-kernel - [ 063/128] KVM: PPC: Emulate dcbf

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Message-Id: <20130203144649.641204027@decadent.org.uk>
Date:	Sun, 03 Feb 2013 15:47:47 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	akpm@...ux-foundation.org, Alexander Graf <agraf@...e.de>,
	Ben Collins <ben.c@...vergy.com>
Subject: [ 063/128] KVM: PPC: Emulate dcbf

3.2-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>
---
 arch/powerpc/kvm/emulate.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/arch/powerpc/kvm/emulate.c
+++ b/arch/powerpc/kvm/emulate.c
@@ -35,6 +35,7 @@
 #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
@@ -370,6 +371,7 @@ 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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