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.
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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