On Fri, Apr 28, 2006 at 02:53:20PM +0100, Keir Fraser wrote:
>
> On 28 Apr 2006, at 03:56, Isaku Yamahata wrote:
>
> >Work around for vnif support of xen/ia64 with dom0 vp model.
> >This is a temporal work around until figuring out how to place a new
> >page
> >after grant table page transfer.
>
> Does netback work *at all* for you with vp model? Looks like this patch
> may make it build but not actually work, which makes it seem a bit
> pointless.
>
> Anyway, two possible solutions are apparent to me:
> 1. netback gathers 'transmitted' skbuffs and then, in one batch, does
> a populate_physmap() call to get new pages for all of them, the
> kfree_skb()s each one back to system pool.
> 2. change semantics of grant transfers for vp guests so that the
> operation automatically gets you a fresh page at the same
> pseudo-physical address.
>
> Option (2) is maybe the better one? Then this patch would make more
> sense (except that the code would be made run-time dependent on
> autotranslate feature flag).
xen/ia64 with vp model adopted (2).
steal_page_for_grant_transfer() does it.
I attached the patch for netback.c. I tested only on xen/ia64 very roughly.
However I think steal_page_for_grant_transfer() in xen/arch/x86/mm.c
(or gnttab_transfer()) also needs modification. Right?
--
yamahata
9889:4f7ee25edd81.patch
Description: Text document
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