KVM: x86 emulator: cmc, clc, cli, sti

Instruction: cmc, clc, cli, sti
opcodes: 0xf5, 0xf8, 0xfa, 0xfb respectively.

[avi: fix reference to EFLG_IF which is not defined anywhere]

Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

diff --git a/drivers/kvm/x86_emulate.c b/drivers/kvm/x86_emulate.c
index 988c6498640f6d276af5fb819f47bc068c74e76d..e962de3316061d3cf9686966eb72d4032b00cce0 100644 (file)
--- a/drivers/kvm/x86_emulate.c
+++ b/drivers/kvm/x86_emulate.c
@@ -161,10 +161,10 @@ static u8 opcode_table[256] = {
        ImplicitOps, SrcImm|ImplicitOps, 0, SrcImmByte|ImplicitOps, 0, 0, 0, 0,
        /* 0xF0 - 0xF7 */
        0, 0, 0, 0,
-       ImplicitOps, 0,
+       ImplicitOps, ImplicitOps,
        ByteOp | DstMem | SrcNone | ModRM, DstMem | SrcNone | ModRM,
        /* 0xF8 - 0xFF */
-       0, 0, 0, 0,
+       ImplicitOps, 0, ImplicitOps, ImplicitOps,
        0, 0, ByteOp | DstMem | SrcNone | ModRM, DstMem | SrcNone | ModRM
 };
 
@@ -1476,6 +1476,23 @@ special_insn:
        case 0xf4:              /* hlt */
                ctxt->vcpu->halt_request = 1;
                goto done;
+       case 0xf5:      /* cmc */
+               /* complement carry flag from eflags reg */
+               ctxt->eflags ^= EFLG_CF;
+               c->dst.type = OP_NONE;  /* Disable writeback. */
+               break;
+       case 0xf8: /* clc */
+               ctxt->eflags &= ~EFLG_CF;
+               c->dst.type = OP_NONE;  /* Disable writeback. */
+               break;
+       case 0xfa: /* cli */
+               ctxt->eflags &= ~X86_EFLAGS_IF;
+               c->dst.type = OP_NONE;  /* Disable writeback. */
+               break;
+       case 0xfb: /* sti */
+               ctxt->eflags |= X86_EFLAGS_IF;
+               c->dst.type = OP_NONE;  /* Disable writeback. */
+               break;
        }
        if (c->rep_prefix) {
                if (c->regs[VCPU_REGS_RCX] == 0) {