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Re: [Xen-devel] Direct Ethernet Connection Bug (3.0.4-1)

  • To: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
  • From: Timo Benk <timo.benk@xxxxxx>
  • Date: Fri, 02 Feb 2007 16:50:25 +0100
  • Cc: Xen devel list <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Fri, 02 Feb 2007 07:50:05 -0800
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Openpgp: id=67E2E5E9; url=http://m28s01.vlinux.de/timo_benk_gpg_key.asc

Keir Fraser wrote:
> On 2/2/07 15:28, "Timo Benk" <timo.benk@xxxxxx> wrote:
>>> So, this crash indicates that you have not given any I/O-memory access
>>> privilege to the backend domain. Have you actually given it access to the
>>> Ethernet PCI device and its I/O memory and I/O port resources?
>> Hm, you are right, i have not given any domains any other privileges then
>> the default setup. Can you give me a hint where i can configure that?
> Ah, but I see actually you don't want a physical device backing up this
> network -- you just want point-to-point virtual network comms between the
> two domUs?

> The only way to grant any iomem to a domU in current tools is by assigning
> access to a PCI device.
> What I can do is add a Xen boot parameter 'permissive_grant' to allow any
> domU to map foreign pages via grant tables. This boot parameter can then be
> removed when we fix the TLB-flushing races in the grant table code.
That sounds good so far.

> Are you running from xen-unstable, or a different codebase?
xen-testing 3.0.4-1


Timo Benk - Jabber ID: fry@xxxxxxxxxxxx - ICQ ID: #414944731
PGP Public Key: http://m28s01.vlinux.de/timo_benk_gpg_key.asc

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