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[Xen-users] Dom0 IO handling

  • To: "xen-users@xxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: maheen butt <maheen_butt26@xxxxxxxxx>
  • Date: Wed, 10 Oct 2012 23:16:28 -0700 (PDT)
  • Delivery-date: Thu, 11 Oct 2012 06:17:43 +0000
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  • List-id: Xen user discussion <xen-users.lists.xen.org>

Hi all,

I'm investigating the source code of Xenified kernel. From documentations related to
Xen told me that all guest domains run in less privilege mode ( ring 1 in case of x86).
Dom0 is also running in ring 1. But it can have direct access to IO devices. It means
Dom0 has a special bahaviour that it is running in ring1 but can directly access IO devices.
How Dom0 access IO devices directly?
how can I relate this special way of Dom0 with its source code?
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