KVM: x86: Wrong flags on CMPS and SCAS emulation

[karo-tx-linux.git] / arch / x86 / kvm / emulate.c

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index e475cdff15e181d2c1f7664efbd5ce74d75684a4..7aba1db168c9c2dd8453d00abdf93845a1d79eed 100644 (file)
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -380,6 +380,15 @@ static int fastop(struct x86_emulate_ctxt *ctxt, void (*fop)(struct fastop *));
        ON64(FOP2E(op##q, rax, cl)) \
        FOP_END
 
+/* 2 operand, src and dest are reversed */
+#define FASTOP2R(op, name) \
+       FOP_START(name) \
+       FOP2E(op##b, dl, al) \
+       FOP2E(op##w, dx, ax) \
+       FOP2E(op##l, edx, eax) \
+       ON64(FOP2E(op##q, rdx, rax)) \
+       FOP_END
+
 #define FOP3E(op,  dst, src, src2) \
        FOP_ALIGN #op " %" #src2 ", %" #src ", %" #dst " \n\t" FOP_RET
 
@@ -913,6 +922,8 @@ FASTOP2W(btc);
 
 FASTOP2(xadd);
 
+FASTOP2R(cmp, cmp_r);
+
 static u8 test_cc(unsigned int condition, unsigned long flags)
 {
        u8 rc;
@@ -3993,12 +4004,12 @@ static const struct opcode opcode_table[256] = {
        I2bv(DstAcc | SrcMem | Mov | MemAbs, em_mov),
        I2bv(DstMem | SrcAcc | Mov | MemAbs | PageTable, em_mov),
        I2bv(SrcSI | DstDI | Mov | String, em_mov),
-       F2bv(SrcSI | DstDI | String | NoWrite, em_cmp),
+       F2bv(SrcSI | DstDI | String | NoWrite, em_cmp_r),
        /* 0xA8 - 0xAF */
        F2bv(DstAcc | SrcImm | NoWrite, em_test),
        I2bv(SrcAcc | DstDI | Mov | String, em_mov),
        I2bv(SrcSI | DstAcc | Mov | String, em_mov),
-       F2bv(SrcAcc | DstDI | String | NoWrite, em_cmp),
+       F2bv(SrcAcc | DstDI | String | NoWrite, em_cmp_r),
        /* 0xB0 - 0xB7 */
        X8(I(ByteOp | DstReg | SrcImm | Mov, em_mov)),
        /* 0xB8 - 0xBF */