On Wed, Oct 17, 2007 at 06:23:41PM +0200, Aurelien Jarno wrote:
> >> The 0F 01 instruction is then correctly emulated, but another of this
> > Oops s/0F 01/invlpg/
> >> group is probably not, as the patch clearly fix the problem on AMD.
> >
>
> I confirm the problem. SVM does not virtualize smsw and lmsw that have
> to be emulated. And it looks like the decoding or/and emulation of those
> instructions is currently broken in KVM.
>
Ok, next try. This time I have opened the IA32 manual (I should have
done that before), so I hope it is correct.
KVM: Access registers for instructions with ModR/M byte and Mod = 3
The patch belows changes the access type to register from memory for
instructions that are declared as SrcMem or DstMem, but have a
ModR/M byte with Mod = 3.
It fixes (at least) the lmsw and smsw instructions on an AMD64 CPU,
which are needed for FreeBSD.
Signed-off-by: Aurelien Jarno <[EMAIL PROTECTED]>
diff --git a/drivers/kvm/x86_emulate.c b/drivers/kvm/x86_emulate.c
index e974ace..005e57c 100644
--- a/drivers/kvm/x86_emulate.c
+++ b/drivers/kvm/x86_emulate.c
@@ -831,6 +831,12 @@ modrm_done:
if (c->twobyte && c->b == 0x01
&& c->modrm_reg == 7)
break;
+ /* For instructions with a ModR/M byte, switch to register
+ access if Mod = 3. */
+ if ((c->d & ModRM) && c->modrm_mod == 3) {
+ c->src.type = OP_REG;
+ break;
+ }
srcmem_common:
c->src.type = OP_MEM;
break;
@@ -893,7 +899,12 @@ srcmem_common:
}
break;
case DstMem:
- c->dst.type = OP_MEM;
+ /* For instructions with a ModR/M byte, switch to register
+ access if Mod = 3. */
+ if ((c->d & ModRM) && c->modrm_mod == 3)
+ c->dst.type = OP_REG;
+ else
+ c->dst.type = OP_MEM;
break;
}
--
.''`. Aurelien Jarno | GPG: 1024D/F1BCDB73
: :' : Debian developer | Electrical Engineer
`. `' [EMAIL PROTECTED] | [EMAIL PROTECTED]
`- people.debian.org/~aurel32 | www.aurel32.net
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