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>

1 files changed, 14 insertions, 1 deletions

diff --git a/arch/x86/kvm/x86_emulate.c b/arch/x86/kvm/x86_emulate.c
index b049b6bf9a71..2a9db4d90bac 100644
--- 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;