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

  • To: Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxx>, "Kay, Allen M" <allen.m.kay@xxxxxxxxx>
  • From: Keir Fraser <keir@xxxxxxx>
  • Date: Wed, 10 Nov 2010 13:38:33 +0000
  • Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Wed, 10 Nov 2010 05:39:16 -0800
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  • Thread-topic: [Xen-devel] Problem: WIndows domu switches power off
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.

 -- Keir



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