KVM: Emulate hlt on real mode for Intel

This has two use cases: the bios can't boot from disk, and guest smp
bootstrap.

Signed-off-by: Avi Kivity <avi@qumranet.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/kvm/x86_emulate.c b/drivers/kvm/x86_emulate.c
index 6123c0292b22..a4a84817b274 100644
--- a/drivers/kvm/x86_emulate.c
+++ b/drivers/kvm/x86_emulate.c
@@ -143,7 +143,8 @@ static u8 opcode_table[256] = {
         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
         /* 0xF0 - 0xF7 */
         0, 0, 0, 0,
-        0, 0, ByteOp | DstMem | SrcNone | ModRM, DstMem | SrcNone | ModRM,
+        ImplicitOps, 0,
+        ByteOp | DstMem | SrcNone | ModRM, DstMem | SrcNone | ModRM,
         /* 0xF8 - 0xFF */
         0, 0, 0, 0,
         0, 0, ByteOp | DstMem | SrcNone | ModRM, DstMem | SrcNone | ModRM
@@ -1149,6 +1150,9 @@ special_insn:
         case 0xae ... 0xaf:     /* scas */
                 DPRINTF("Urk! I don't handle SCAS.\n");
                 goto cannot_emulate;
+        case 0xf4:              /* hlt */
+                ctxt->vcpu->halt_request = 1;
+                goto done;
         }
         goto writeback;