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

["D.G. Murray" <Derek.Murray@xxxxxxxxxxxx>]

Hi Mark, 

> Maybe a change to the gntdev userspace API to allow batching 
> of mapping requests?

Something along the lines of the following?

/**
 * Memory maps one or more grant references from one or more domains to a
 * contiguous local address range. Mappings should be unmapped with
 * xc_gnttab_munmap. Returns NULL on failure.
 *
 * @parm xcg_handle a handle on an open grant table interface
 * @parm count the number of grant references to be mapped
 * @parm domids an array of @count domain IDs by which the corresponding
@refs
 * were granted
 * @parm refs an array of @count grant references to be mapped
 * @parm prot same flag as in mmap()
 */
void *xc_gnttab_map_grant_refs(int xcg_handle,
                               uint32_t count,
                               uint32_t *domids,
                               uint32_t *refs,
                               int prot); 

http://xenbits.xensource.com/xen-unstable.hg?file/3057f813da14/tools/libxc/x
enctrl.h

> blktap in userspace, if any performance problems can be 
> addressed, would seem to be a far nicer way of doing things.  
> And it's less code to merge upstream ;-)

Agreed.

Cheers,

Derek.


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