Re: [Xen-devel] Interrupt issues with hvm_emulate_one_vm_event()

[Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>]

On 05/26/17 17:29, Jan Beulich wrote:
>>>> On 25.05.17 at 11:40, <rcojocaru@xxxxxxxxxxxxxxx> wrote:
>> I've noticed that, with pages marked NX and vm_event emulation, we can
>> end up emulating an ud2, for which hvm_emulate_one() returns
>> X86EMUL_EXCEPTION in hvm_emulate_one_vm_event().
> 
> Could you explain what would lead to emulation of UD2?

If you mean in which cases does our engine mark pages NX, I'll have to
ask and get back to you. If you mean why generally would an UD2 end up
being the instruction where RIP causes an execute violation fault, I'll
have to check.


Thanks,
Razvan

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