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KVM: x86 emulator: fix smsw and lmsw with a memory operand

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lmsw and smsw were implemented only with a register operand.  Extend them
to support a memory operand as well.  Fixes Windows running some display
compatibility test on AMD hosts.

Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Avi Kivity 2008-04-14 14:40:50 +03:00
parent 66b8550573
commit 16286d082d
1 changed files with 17 additions and 12 deletions
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29
arch/x86/kvm/x86_emulate.c
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@ -275,12 +275,15 @@ static u16 group_table[] = {
SrcMem | ModRM, 0, SrcMem | ModRM | Stack, 0,
[Group7*8] =
0, 0, ModRM | SrcMem, ModRM | SrcMem,
SrcNone | ModRM | DstMem, 0, SrcMem | ModRM, SrcMem | ModRM | ByteOp,
SrcNone | ModRM | DstMem | Mov, 0,
SrcMem16 | ModRM | Mov, SrcMem | ModRM | ByteOp,
};
static u16 group2_table[] = {
[Group7*8] =
SrcNone | ModRM, 0, 0, 0, SrcNone | ModRM | DstMem, 0, SrcMem | ModRM, 0,
SrcNone | ModRM, 0, 0, 0,
SrcNone | ModRM | DstMem | Mov, 0,
SrcMem16 | ModRM | Mov, 0,
};
/* EFLAGS bit definitions. */
@ -1722,6 +1725,8 @@ twobyte_insn:
goto done;
kvm_emulate_hypercall(ctxt->vcpu);
/* Disable writeback. */
c->dst.type = OP_NONE;
break;
case 2: /* lgdt */
rc = read_descriptor(ctxt, ops, c->src.ptr,
@ -1729,6 +1734,8 @@ twobyte_insn:
if (rc)
goto done;
realmode_lgdt(ctxt->vcpu, size, address);
/* Disable writeback. */
c->dst.type = OP_NONE;
break;
case 3: /* lidt/vmmcall */
if (c->modrm_mod == 3 && c->modrm_rm == 1) {
@ -1744,27 +1751,25 @@ twobyte_insn:
goto done;
realmode_lidt(ctxt->vcpu, size, address);
}
/* Disable writeback. */
c->dst.type = OP_NONE;
break;
case 4: /* smsw */
if (c->modrm_mod != 3)
goto cannot_emulate;
*(u16 *)&c->regs[c->modrm_rm]
= realmode_get_cr(ctxt->vcpu, 0);
c->dst.bytes = 2;
c->dst.val = realmode_get_cr(ctxt->vcpu, 0);
break;
case 6: /* lmsw */
if (c->modrm_mod != 3)
goto cannot_emulate;
realmode_lmsw(ctxt->vcpu, (u16)c->modrm_val,
&ctxt->eflags);
realmode_lmsw(ctxt->vcpu, (u16)c->src.val,
&ctxt->eflags);
break;
case 7: /* invlpg*/
emulate_invlpg(ctxt->vcpu, memop);
/* Disable writeback. */
c->dst.type = OP_NONE;
break;
default:
goto cannot_emulate;
}
/* Disable writeback. */
c->dst.type = OP_NONE;
break;
case 0x06:
emulate_clts(ctxt->vcpu);