From: Nadav Amit Date: Sun, 15 Jun 2014 13:13:00 +0000 (+0300) Subject: KVM: x86: emulation of dword cmov on long-mode should clear [63:32] X-Git-Tag: v3.17-rc1~141^2~76 X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=140bad89fd25db1aab60f80ed7874e9a9bdbae3b;p=~emulex%2Finfiniband.git KVM: x86: emulation of dword cmov on long-mode should clear [63:32] Even if the condition of cmov is not satisfied, bits[63:32] should be cleared. This is clearly stated in Intel's CMOVcc documentation. The solution is to reassign the destination onto itself if the condition is unsatisfied. For that matter the original destination value needs to be read. Signed-off-by: Nadav Amit Signed-off-by: Paolo Bonzini --- diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index 27ce38693f0..6f09b2e555e 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -3923,7 +3923,7 @@ static const struct opcode twobyte_table[256] = { N, N, N, N, N, N, N, N, N, N, /* 0x40 - 0x4F */ - X16(D(DstReg | SrcMem | ModRM | Mov)), + X16(D(DstReg | SrcMem | ModRM)), /* 0x50 - 0x5F */ N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, /* 0x60 - 0x6F */ @@ -4824,8 +4824,10 @@ twobyte_insn: ops->get_dr(ctxt, ctxt->modrm_reg, &ctxt->dst.val); break; case 0x40 ... 0x4f: /* cmov */ - ctxt->dst.val = ctxt->dst.orig_val = ctxt->src.val; - if (!test_cc(ctxt->b, ctxt->eflags)) + if (test_cc(ctxt->b, ctxt->eflags)) + ctxt->dst.val = ctxt->src.val; + else if (ctxt->mode != X86EMUL_MODE_PROT64 || + ctxt->op_bytes != 4) ctxt->dst.type = OP_NONE; /* no writeback */ break; case 0x80 ... 0x8f: /* jnz rel, etc*/