From: Takuya Yoshikawa <[email protected]> This stops "CMP r/m, reg" to write back the data into memory. Pointed out by Avi.
Signed-off-by: Takuya Yoshikawa <[email protected]> --- arch/x86/kvm/emulate.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-) diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index 14c5ad5..8a73805 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -3084,6 +3084,7 @@ special_insn: emulate_2op_SrcV("xor", c->src, c->dst, ctxt->eflags); break; case 0x38 ... 0x3d: + c->dst.type = OP_NONE; /* Disable writeback. */ cmp: /* cmp */ emulate_2op_SrcV("cmp", c->src, c->dst, ctxt->eflags); break; @@ -3138,6 +3139,7 @@ special_insn: case 6: goto xor; case 7: + c->dst.type = OP_NONE; /* Disable writeback. */ goto cmp; } break; -- 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
