[Xen-devel] [RFC] Cleaning up /proc/xen

[Anthony Liguori <aliguori@xxxxxxxxxx>]

Today, in /proc/xen we have:

/proc/xen/balloon  -   displays information about memory allocations and 
allows for ballooning by echoing a byte value into file
/proc/xen/privcmd  -  allows for userspace invocation of hypercalls and 
mapping of other domains memory
/proc/xen/grant   -   allows grant table operations to be accessed from 
userspace
/proc/xen/xenbus  -   allows xenbus to be accessed from userspace (in domUs)

I propose we do the following:

Change /proc/xen/{privcmd,grant,xenbus} to character devices (that use 
random major/minors; we'll always access them by name).  We have a few 
options for /proc/xen/balloon.  We could:
1) Get rid of it completely--not sure it's a good idea but it's been 
suggested since it's redundant (in dom0 at least).
2) Move it to /proc/sys/
3) Move it to /sys/xen

I'm partial to the last option (maybe even /sys/hypervisor/xen--that 
seems to compliment /sys/firmware).
Thoughts?

Regards,

Anthony Liguori

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