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>

1 files changed, 19 insertions, 2 deletions

diff --git a/drivers/kvm/x86_emulate.c b/drivers/kvm/x86_emulate.c
index 988c6498640f..e962de331606 100644
--- 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) {