KVM: x86 emulator: add support for jmp far 0xea

Add support for jmp far (opcode 0xea) instruction.

Signed-off-by: Guillaume Thouvenin <guillaume.thouvenin@ext.bull.net>
Signed-off-by: Laurent Vivier <laurent.vivier@bull.net>
Signed-off-by: Avi Kivity <avi@qumranet.com>

diff --git a/arch/x86/kvm/x86_emulate.c b/arch/x86/kvm/x86_emulate.c
index a928aa6..48b62cc 100644 (file)
--- a/arch/x86/kvm/x86_emulate.c
+++ b/arch/x86/kvm/x86_emulate.c
@@ -168,7 +168,8 @@ static u16 opcode_table[256] = {
        /* 0xE0 - 0xE7 */
        0, 0, 0, 0, 0, 0, 0, 0,
        /* 0xE8 - 0xEF */
-       ImplicitOps | Stack, SrcImm|ImplicitOps, 0, SrcImmByte|ImplicitOps,
+       ImplicitOps | Stack, SrcImm | ImplicitOps,
+       ImplicitOps, SrcImmByte | ImplicitOps,
        0, 0, 0, 0,
        /* 0xF0 - 0xF7 */
        0, 0, 0, 0,
@@ -1661,7 +1662,33 @@ special_insn:
                break;
        }
        case 0xe9: /* jmp rel */
-       case 0xeb: /* jmp rel short */
+               goto jmp;
+       case 0xea: /* jmp far */ {
+               uint32_t eip;
+               uint16_t sel;
+
+               switch (c->op_bytes) {
+               case 2:
+                       eip = insn_fetch(u16, 2, c->eip);
+                       break;
+               case 4:
+                       eip = insn_fetch(u32, 4, c->eip);
+                       break;
+               default:
+                       DPRINTF("jmp far: Invalid op_bytes\n");
+                       goto cannot_emulate;
+               }
+               sel = insn_fetch(u16, 2, c->eip);
+               if (kvm_load_segment_descriptor(ctxt->vcpu, sel, 9, VCPU_SREG_CS) < 0) {
+                       DPRINTF("jmp far: Failed to load CS descriptor\n");
+                       goto cannot_emulate;
+               }
+
+               c->eip = eip;
+               break;
+       }
+       case 0xeb:
+             jmp:              /* jmp rel short */
                jmp_rel(c, c->src.val);
                c->dst.type = OP_NONE; /* Disable writeback. */
                break;