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

  • To: "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx>
  • From: "Eric Benton" <benton71@xxxxxxxxx>
  • Date: Thu, 26 Oct 2006 20:31:16 +0200
  • Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Thu, 26 Oct 2006 11:31:41 -0700
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Thanks Keir for the fast response!

To implement the PV-on-HVM, have you used a PCI probing in the hypervisor?
I don't get how you left the HVM operating system unmodified? Is it a FE/BE model? Does the HVM uses the "old" dom0 FEs?

Thanks again,

On 10/26/06, Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> wrote:

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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