Re: [Xen-devel] possible I/O emulation state machine issue

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 23.03.18 at 14:41, <Paul.Durrant@xxxxxxxxxx> wrote:
> So somehow it appears the vcpu got back into guest and executed the next 
> instruction whilst there was pending I/O.

Two new pieces of information, in case either rings a bell:

The issue appears to never occur in hap=0 mode.

After having added I/O emulation state checks at the beginning of
vmx_vmexit_handler() as well as very early and very late in
vmx_vmenter_helper(), it was the one early in
vmx_vmenter_helper() which triggered (still seeing the VGA port
access in STATE_IORESP_READY while vio->io_completion was
HVMIO_no_completion).

Jan


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