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RE: [Xen-devel] [Q] Is qemu used when we use VTd?

  • To: "Akio Takebe" <takebe_akio@xxxxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: "Tian, Kevin" <kevin.tian@xxxxxxxxx>
  • Date: Thu, 11 Sep 2008 19:01:39 +0800
  • Cc:
  • Delivery-date: Thu, 11 Sep 2008 04:02:57 -0700
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AckT+7qKxUV5rj6OT/qrVx8ioKLq6QAAdjBw
  • Thread-topic: [Xen-devel] [Q] Is qemu used when we use VTd?

>From: Akio Takebe
>Sent: 2008年9月11日 18:46
>If we assign a device to HVM guest,
>HVM guest can do directry DMA transfer.
>But how about accessing pci configuration register
>of the pass through device? Do we still access
>pci configuration register through qemu?

Yes, even when we say that given on PCI config field
can be directly accessed by HVM guest, it's still trapped
to Qemu for route.


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