From: Takuya Yoshikawa <[email protected]> This stops "CMP r/m, reg" to write back the data into memory. Pointed out by Avi.
The writeback suppression now covers CMP, CMPS, SCAS. Signed-off-by: Takuya Yoshikawa <[email protected]> --- Changelog v1->v2: moved the line just after the cmp label. arch/x86/kvm/emulate.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index 3e8b4ab..db48e91 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -3671,6 +3671,7 @@ special_insn: break; case 0x38 ... 0x3d: cmp: /* cmp */ + c->dst.type = OP_NONE; /* Disable writeback. */ emulate_2op_SrcV("cmp", c->src, c->dst, ctxt->eflags); break; case 0x40 ... 0x47: /* inc r16/r32 */ @@ -3797,7 +3798,6 @@ special_insn: rc = emulate_popf(ctxt, ops, &c->dst.val, c->op_bytes); break; case 0xa6 ... 0xa7: /* cmps */ - c->dst.type = OP_NONE; /* Disable writeback. */ goto cmp; case 0xa8 ... 0xa9: /* test ax, imm */ goto test; -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
