Re: [Xen-devel] [PATCH 2/6] xl: Add commands for hiding and unhiding pcie passthrough devices

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Fri, Jul 07, 2017 at 10:00:01AM -0400, Konrad Rzeszutek Wilk wrote:
> > 
> > 1. PV PCI passthrough is done via pciback, which means the physical
> >    device is assigned to the driver domain. All events to / from the
> >    guest / device are handled by the driver domain -- which includes
> >    the AER error you're trying to handle.
> > 
> > 2. HVM PCI passthrough is done via QEMU, but you also need to pre-assign
> >    the device to the driver domain in which QEMU runs. All events are only
> >    visible to the driver domain.
> > 
> > Yes, a guest is going to be always killable by Dom0 (the toolstack
> > domain), even if some devices of the guest are handled by a driver
> > domain.
> > 
> > But Dom0 now can't see the AER event so it won't be able to issue the
> > "kill" or whatever action you want it to do. Is this not the case? Do
> 
> It can. That is how it works right now - the AER errors are sent to the
> PCIe bridge which is a device driver in domain0. Then the kernel
> sends it to pciback (which owns the device) to deal with.
> 

So pciback will have to run in Dom0?

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