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KVM: PPC: Emulate dcbf

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commit d3286144c9 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>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Cc: Qiang Huang <h.huangqiang@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexander Graf 2013-01-17 13:50:25 +01:00 committed by Greg Kroah-Hartman
parent 115f50635c
commit 67bc20f722
1 changed files with 2 additions and 0 deletions
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2
arch/powerpc/kvm/emulate.c
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@ -36,6 +36,7 @@
#define OP_TRAP_64 2 #define OP_TRAP_64 2
#define OP_31_XOP_LWZX 23 #define OP_31_XOP_LWZX 23
#define OP_31_XOP_DCBF 86
#define OP_31_XOP_LBZX 87 #define OP_31_XOP_LBZX 87
#define OP_31_XOP_STWX 151 #define OP_31_XOP_STWX 151
#define OP_31_XOP_STBX 215 #define OP_31_XOP_STBX 215
@ -373,6 +374,7 @@ int kvmppc_emulate_instruction(struct kvm_run *run, struct kvm_vcpu *vcpu)
kvmppc_set_exit_type(vcpu, EMULATED_MTSPR_EXITS); kvmppc_set_exit_type(vcpu, EMULATED_MTSPR_EXITS);
break; break;
case OP_31_XOP_DCBF:
case OP_31_XOP_DCBI: case OP_31_XOP_DCBI:
/* Do nothing. The guest is performing dcbi because /* Do nothing. The guest is performing dcbi because
* hardware DMA is not snooped by the dcache, but * hardware DMA is not snooped by the dcache, but