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

  • To: "Akio Takebe" <takebe_akio@xxxxxxxxxxxxxx>
  • From: "Tian, Kevin" <kevin.tian@xxxxxxxxx>
  • Date: Fri, 12 Sep 2008 10:37:59 +0800
  • Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Thu, 11 Sep 2008 19:38:25 -0700
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AckT/paEhiv4a2A4Q1qpPll7JBJKHgAgb9CQ
  • Thread-topic: [Xen-devel] [Q] Is qemu used when we use VTd?

>From: Akio Takebe [mailto:takebe_akio@xxxxxxxxxxxxxx] 
>Sent: 2008年9月11日 19:07
>Thank you.
>And mmio is traped by hypervisor,
>then hypervisor do mmio instead of HVM guest, Right?

Which mmio are you actually talking? If you mean MMIO
ranges in PCI BARs of passthrough device, they can be
directly accessed by HVM with p2m entry setup accord-
ingly, if MMIO range falls in 4k page granularity.


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