On Thu, Feb 03, 2011 at 12:18:58PM -0500, Daniel De Graaf wrote:
> Changes since v5:
>   - Added a tested xen version to workaround in #4
>   - Cleaned up variable names & structures
>   - Clarified some of the cleanup in gntalloc
>   - Removed copyright statement from public-domain files
> 
> [PATCH 1/6] xen-gntdev: Change page limit to be global instead of per-open
> [PATCH 2/6] xen-gntdev: Use find_vma rather than iterating our vma list manually
> [PATCH 3/6] xen-gntdev: Add reference counting to maps
> [PATCH 4/6] xen-gntdev: Support mapping in HVM domains
> [PATCH 5/6] xen-gntalloc: Userspace grant allocation driver
> [PATCH 6/6] xen/gntalloc,gntdev: Add unmap notify ioctl
> 
> Test/Demo code (also updated):

I played with this (two PV domains) and I got two failures:

1). When forgetting to unmap a grant page and quitting the tool
2). when unmapping appropriately.

Attached are the logs from the domain exporting the grants
(domain 4), and the faulting (domain 3 and domain 5).

This is using this patchset (devel/gntalloc.v6) and sticking
it on top of 2.6.38-rc2 with a whole bunch of patches. To be
specific:

git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git #master