Hi,
Oh, now I see why you did that. I'm eager to test the PCI hotplug stuff :-)
The only thing that is concerning me is that it becomes VT-d specific.
And I still think that the hypervisor is a bad place to put that code...
Thanks,
Guy.
> -----Original Message-----
> From: Han, Weidong [mailto:weidong.han@xxxxxxxxx]
> Sent: Sunday, January 27, 2008 2:38 PM
> To: Guy Zana; xen-devel@xxxxxxxxxxxxxxxxxxx
> Cc: Xu, Anthony; Kay, Allen M
> Subject: RE: [Xen-devel] [VTD][PATCH] Do FLR of assigned
> devices with VT-d
>
> Hi Guy,
>
> If you use "xm destroy" or click "x" on qemu window to
> destroy guest, the assigned device may be stayed in a
> incorrect status. We met that the irq of the assigned device
> may be disabled by dom0 after destroy guest, then all the
> devices using the same irq can't work any more. We also met
> guest complained the device was not in a correct status
> during its booting period.
>
> We think there are three places where need invoking FLR
> function. The first place is before device assignment, the
> second one is after exit/destroy guest, the last one is
> dynamic reassignment after support vtd hotplug. In the latter
> two cases, it is hard to catch the point to do FLR in qemu.
>
> Randy (Weidong)
>
> Guy Zana wrote:
> > That's a good addition, why moving this functionality to the
> > hypervisor? BTW, can you give real world example where this was
> > needed?
> >
> > Thanks,
> > Guy.
> >
> >> -----Original Message-----
> >> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
> >> [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Han,
> >> Weidong
> >> Sent: Thursday, January 24, 2008 4:39 AM
> >> To: xen-devel@xxxxxxxxxxxxxxxxxxx
> >> Cc: Xu, Anthony; Kay,Allen M
> >> Subject: [Xen-devel] [VTD][PATCH] Do FLR of assigned devices with
> >> VT-d
> >>
> >> Currently there is a pdev_flr() function to do FLR before device
> >> assignment in qemu, but most of devices don't have FLR capability.
> >> What's more, should do FLR before assignment and deassignment for
> >> keeping correct device status. If the device doesn't have FLR
> >> capablility, this patch implemented to enter D3hot and
> return to D0
> >> to do FLR. And exposed pdev_flr() in VT-d utils, then it can be
> >> invoked by assignment and deassignment functions.
> >>
> >> Signed-off-by: Weidong Han <weidong.han@xxxxxxxxx>
> >> Signed-off-by: Anthony Xu <anthony.xu@xxxxxxxxx
>
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