KVM: x86 emulator: Add support for mov r, sreg (0x8c) instruction

Add support for mov r, sreg (0x8c) 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 b049b6b..2a9db4d 100644 (file)
--- a/arch/x86/kvm/x86_emulate.c
+++ b/arch/x86/kvm/x86_emulate.c
@@ -138,7 +138,7 @@ static u16 opcode_table[256] = {
        /* 0x88 - 0x8F */
        ByteOp | DstMem | SrcReg | ModRM | Mov, DstMem | SrcReg | ModRM | Mov,
        ByteOp | DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov,
-       0, ModRM | DstReg,
+       DstMem | SrcReg | ModRM | Mov, ModRM | DstReg,
        DstReg | SrcMem | ModRM | Mov, Group | Group1A,
        /* 0x90 - 0x9F */
        0, 0, 0, 0, 0, 0, 0, 0,
@@ -1518,6 +1518,19 @@ special_insn:
                break;
        case 0x88 ... 0x8b:     /* mov */
                goto mov;
+       case 0x8c: { /* mov r/m, sreg */
+               struct kvm_segment segreg;
+
+               if (c->modrm_reg <= 5)
+                       kvm_get_segment(ctxt->vcpu, &segreg, c->modrm_reg);
+               else {
+                       printk(KERN_INFO "0x8c: Invalid segreg in modrm byte 0x%02x\n",
+                              c->modrm);
+                       goto cannot_emulate;
+               }
+               c->dst.val = segreg.selector;
+               break;
+       }
        case 0x8d: /* lea r16/r32, m */
                c->dst.val = c->modrm_ea;
                break;