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[Xen-devel] Re: Next steps with pv_ops for Xen

To: "Stephen C. Tweedie" <sct@xxxxxxxxxx>
Subject: [Xen-devel] Re: Next steps with pv_ops for Xen
From: Gerd Hoffmann <kraxel@xxxxxxxxxx>
Date: Mon, 03 Dec 2007 13:54:02 +0100
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Eduardo Habkost <ehabkost@xxxxxxxxxx>, Juan Quintela <quintela@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxxxx>, Glauber de Oliveira Costa <gcosta@xxxxxxxxxx>, Chris Wright <chrisw@xxxxxxxxxxxx>, "virtualization@xxxxxxxxxxxxxx" <virtualization@xxxxxxxxxxxxxx>
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Stephen C. Tweedie wrote:
> Hi all,
> 
>   driver domains

Looked at the gntdev (grant table mappings for user space) driver,
noticed that one is not self-contained.  It needs a hook for page unmapping:

  http://xenbits.xensource.com/xen-3.1-testing.hg?rev/7180d2e61f92
  plus an s/ptep_get_and_clear_full/zap_pte/ fixup a few changesets
  later.

Upstreaming that one could become *uhm* intresting.  Nevertheless the
gntdev functionality is quite useful for writing pure userspace
backend drivers ...

cheers,
  Gerd

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