Nitin A Kamble wrote:
> Hi Avi,
> I was trying to avoid vm86 mode completely, by using emulation for
> all the real mode code emulation. It is doing better than vm86 mode,
Why do you think it is better? I would have thought that vm86 is much
faster.
I thought of doing it this way:
- try to run normally
- if vm entry failed due to invalid guest state (the famous 0x80000021),
then emulate 50 instructions
- repeat
That will also handle the few cases where VT can't handle protected mode.
> but
> I am seeing one issue with this approch.
>
> The emulator is failing due to this code. Seems like the execution
> need to go back to qemu to finish some pending MMIO.
>
> if (vcpu->mmio_is_write) {
> vcpu->mmio_needed = 0;
> return EMULATE_DO_MMIO;
> }
>
> Do you have how should it be handled? I am not clear what needs to be
> done to handle this situation properly.
>
It should exit to userspace, same as the non-emulating case. However it
shouldn't happen for normal writes.
--
Do not meddle in the internals of kernels, for they are subtle and quick to
panic.
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