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** Changed in: qemu
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1809144
Title:
SVM instructions fail with SVME bit enabled
Status in QEMU:
Incomplete
Bug description:
I was trying to use QEMU/TCG to emulate some stuff that uses SVM.
I know SVM is only partially implemented but I gave it a try anyway.
I found that if SVM is enabled in the same basic block in which there's a
call to VMSAVE/etc,
the call fails as illegal op because the flags don't get updated correctly.
The pseudocode for the asm I'm running is:
```
EFER |= SVME; set the appropriate bit with wrmsr
vmsave
```
This is an example of the relevant translate.c code:
```
if (!(s->flags & HF_SVME_MASK) || !s->pe) {
goto illegal_op;
}
if (s->cpl != 0) {
gen_exception(s, EXCP0D_GPF, pc_start - s->cs_base);
break;
}
```
s->flags doesn't get updated after the wrmsr instruction and so QEMU
raises an illegal opcode interrupt.
A quick fix is to make the tb end after `wrmsr` instructions, but it's an
hack afaik.
I'm not too comfortable with QEMU's code, so I don't know what a proper fix
would be.
Cheers,
thebabush
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