Re: [Xen-devel] Problem: WIndows domu switches power off

[Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxx>]

Am 10.11.2010 schrieb "Keir Fraser <keir@xxxxxxx>":

> On 10/11/2010 13:27, "Dietmar Hahn" <dietmar.hahn@xxxxxxxxxxxxxx> wrote:

>

> > The Intel VTd-spec writes in chapter 8.3. "DMA Remapping Hardware Unit

> >

> > Definition Structure" that the "Segment Number" is the PCI Segment associated

> >

> > with this unit.

> >

> > So what is a PCI Segment here?

>

> PCI segments/domains are groupings of PCI buses. So they're a further step

> up the hierarchy from bus-dev-fn. Very few x86 systems have multiple

> segments, so it's almost certain that segment=0 is correct for all PCI

> devices in your system.

Thanks, now I know what the first part of "0000:10:00.0" in

/sys/bus/pci/devices is for ;-)

Dietmar.

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