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RE: [Xen-devel] About IO

  • To: "Liu, Huahang" <huahang.liu@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: "Li, Xin B" <xin.b.li@xxxxxxxxx>
  • Date: Fri, 30 Mar 2007 11:36:51 +0800
  • Delivery-date: Fri, 30 Mar 2007 04:38:04 +0100
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AcdyeZanoNJ6aPq6SKS+5oY9VtNsoAAAcRKAAAAiJ5A=
  • Thread-topic: [Xen-devel] About IO
>What is the MMIO address space of Xen HVM? 

>From 4G-256M to 4G, you can take a look at the definition of
HVM_BELOW_4G_MMIO_LENGTH.

>What happen when I read from or write to these IO ports? 

Depends on the devices located there, if no device, Read returns ~0,
while writes are ignored.
-Xin

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