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xen-devel
RE: [Xen-devel] Re: Next steps with pv_ops for Xen
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To: |
"'Mark Williamson'" <mark.williamson@xxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx> |
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Subject: |
RE: [Xen-devel] Re: Next steps with pv_ops for Xen |
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From: |
"D.G. Murray" <Derek.Murray@xxxxxxxxxxxx> |
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Date: |
Mon, 3 Dec 2007 18:36:37 -0000 |
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Cc: |
'Eduardo Habkost' <ehabkost@xxxxxxxxxx>, 'Juan Quintela' <quintela@xxxxxxxxxx>, "'Stephen C. Tweedie'" <sct@xxxxxxxxxx>, 'Jan Beulich' <jbeulich@xxxxxxxxxx>, 'Glauber de Oliveira Costa' <gcosta@xxxxxxxxxx>, 'Chris Wright' <chrisw@xxxxxxxxxxxx>, virtualization@xxxxxxxxxxxxxx, 'Gerd Hoffmann' <kraxel@xxxxxxxxxx> |
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Mon, 03 Dec 2007 10:37:48 -0800 |
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<200712031718.28234.mark.williamson@xxxxxxxxxxxx> |
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Acg10JUKEoAzywSBQEeJmxKUBNPdyAAAEFcg |
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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