Re: kvm-22 and Vista support

[Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>]

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Jorge Lucángeli Obes wrote:
> I had some time on my hands lately and tried to debug this a little. I
> found that there's actually something showing in dmesg:
>
> [ 3872.221039] emulation failed but !mmio_needed? rip 9a12 0f 09 66 25
>
> Does that help? I'm running kvm-24 now, but the exception still
> happens. I've been looking through x86_emulate.c and kvmctl.c trying
> to print more information but with no success yet.
>   

Does the attached patch help?  It implements 0f 09, wbinvd.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.


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diff --git a/drivers/kvm/x86_emulate.c b/drivers/kvm/x86_emulate.c
index 7ade090..6123c02 100644
--- a/drivers/kvm/x86_emulate.c
+++ b/drivers/kvm/x86_emulate.c
@@ -152,7 +152,7 @@ static u8 opcode_table[256] = {
 static u16 twobyte_table[256] = {
 	/* 0x00 - 0x0F */
 	0, SrcMem | ModRM | DstReg, 0, 0, 0, 0, ImplicitOps, 0,
-	0, 0, 0, 0, 0, ImplicitOps | ModRM, 0, 0,
+	0, ImplicitOps, 0, 0, 0, ImplicitOps | ModRM, 0, 0,
 	/* 0x10 - 0x1F */
 	0, 0, 0, 0, 0, 0, 0, 0, ImplicitOps | ModRM, 0, 0, 0, 0, 0, 0, 0,
 	/* 0x20 - 0x2F */
@@ -1304,6 +1304,8 @@ twobyte_special_insn:
 	/* Disable writeback. */
 	dst.orig_val = dst.val;
 	switch (b) {
+	case 0x09:		/* wbinvd */
+		break;
 	case 0x0d:		/* GrpP (prefetch) */
 	case 0x18:		/* Grp16 (prefetch/nop) */
 		break;

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