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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