From: Guillaume Thouvenin <guillaume.thouvenin@ext.bull.net>
Add support for mov r, sreg (0x8c) instruction.
[avi: drop the sreg decoding table in favor of 1:1 encoding]
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>
---
arch/x86/kvm/x86_emulate.c | 25 ++++++++++++++++++++++++-
1 files changed, 24 insertions(+), 1 deletions(-)
diff --git a/arch/x86/kvm/x86_emulate.c b/arch/x86/kvm/x86_emulate.c
index 21d7ff6..b049b6b 100644
--- a/arch/x86/kvm/x86_emulate.c
+++ b/arch/x86/kvm/x86_emulate.c
@@ -138,7 +138,8 @@ 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, 0, Group | Group1A,
+ 0, ModRM | DstReg,
+ DstReg | SrcMem | ModRM | Mov, Group | Group1A,
/* 0x90 - 0x9F */
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, ImplicitOps | Stack, ImplicitOps | Stack, 0, 0,
@@ -1520,6 +1521,28 @@ special_insn:
case 0x8d: /* lea r16/r32, m */
c->dst.val = c->modrm_ea;
break;
+ case 0x8e: { /* mov seg, r/m16 */
+ uint16_t sel;
+ int type_bits;
+ int err;
+
+ sel = c->src.val;
+ if (c->modrm_reg <= 5) {
+ type_bits = (c->modrm_reg == 1) ? 9 : 1;
+ err = kvm_load_segment_descriptor(ctxt->vcpu, sel,
+ type_bits, c->modrm_reg);
+ } else {
+ printk(KERN_INFO "Invalid segreg in modrm byte 0x%02x\n",
+ c->modrm);
+ goto cannot_emulate;
+ }
+
+ if (err < 0)
+ goto cannot_emulate;
+
+ c->dst.type = OP_NONE; /* Disable writeback. */
+ break;
+ }
case 0x8f: /* pop (sole member of Grp1a) */
rc = emulate_grp1a(ctxt, ops);
if (rc != 0)
--
1.5.6
--
