[Xen-devel] [PATCH 0/3] User-space grant table device

[Derek Murray <Derek.Murray@xxxxxxxxxxxx>]

This is a repost of an earlier patch-set, modified to change the  
unmapping hook and to add support for ia64 and ppc.
From the previous description:

> I've completed a version of a Linux kernel driver for mapping  
> granted pages into user-space. There are a few use cases for this,  
> but the most important (from a XenSE/dom0 disaggregation point of  
> view) is changing the way the the console daemon and xenstore map  
> their respective pages in the guests. A further possibility might  
> be reimplementing blktap entirely in user-space.
> Currently the driver supports:
> * Mapping one or more pages at a time into a contiguous portion of  
> memory..
> * Mapping up to 128 pages per file descriptor (this is an arbitrary  
> limit, but it would be trivial to make this configurable).
> * Each page may only be mapped once. However, it is possible to map  
> the same grant more than once: simply register the grant twice with  
> the ioctl, and then map the two (different) offsets.
> In addition, I've written some simple libxc functions (of the same  
> format as the xc_evtchn_* functions) that provide access to the  
> driver.
I've split up the patch as follows:

1. linux-changes.patch: These contain the necessary changes to linux  
(in effect, adding a hook to the vm_operations_struct that is called  
by the zap_pte_range function) for unmapping grants before the page  
table is destroyed.
2. gntdev.patch: This is the main driver, and associated header file.
3. libxc-changes.patch: These are the libxc functions for accessing  
the driver.
I'd welcome your comments.

Regards,

Derek Murray.


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