Re: [Qemu-devel] [v5][PATCH 2/5] xen, gfx passthrough: create pseudo intel isa bridge

[Michael S. Tsirkin]

On Wed, Jun 25, 2014 at 04:48:02PM +0800, Chen, Tiejun wrote:
> On 2014/6/25 16:43, Michael S. Tsirkin wrote:
> >On Wed, Jun 25, 2014 at 04:39:07PM +0800, Chen, Tiejun wrote:
> >>>In fact it's exactly what passthrough does.
> >>>I wonder if more bits from ./hw/i386/kvm/pci-assign.c
> >>>can be reused. How do you poke at the host device? sysfs?
> >>
> >>Yes, sysfs.
> >>
> >>Thanks
> >>Tiejun
> >
> >Then you should be able to re-use large chunks of
> >./hw/i386/kvm/pci-assign.c: basically everything
> >that deals with emulation.
> 
> Do you mean those hooks to get info from the real device? Xen have its own
> wrapper, xen_host_pci_get_block(), so we always go there in xen scenario.
> 
> Thanks
> Tiejun

Yes and that's not good.  We have two pieces of code doing mostly
identical things slightly differently.
hw/i386/kvm/pci-assign.c is a bit younger so it's cleaner,
but these really need to be unified.

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