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Re: [Xen-devel] A couple of questions about Xen

  • To: Eric Benton <benton71@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
  • Date: Thu, 26 Oct 2006 19:08:58 +0100
  • Delivery-date: Thu, 26 Oct 2006 11:20:36 -0700
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: Acb5Kc5+DTXWAGUdEduoQgANk04WTA==
  • Thread-topic: [Xen-devel] A couple of questions about Xen

On 26/10/06 6:27 pm, "Eric Benton" <benton71@xxxxxxxxx> wrote:

1. Is it possible to share contiguous memory regions between a hvm domain and dom0 using the grant tables?
2. Why do we need the piix bridge in the ioemu? is it being used at all?

  1. Yes. The PV-on-HVM drivers do this (from HVM to dom0). Other way (dom0 pages mapped in HVM) will not work as yet.
  2. It’s used for PCI-ISA IRQ routing. I wondered about removing it but I think I’ve changed my mind for the time being. If you boot an HVM guest in APIC mode, it will not have the ‘4 IRQ routers’ limitation.

 -- Keir
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