Re: [Xen-devel] [PATCH 5/5] changes of common files for xen/ia64 dom0 vp model: netback work around

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

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).
 -- Keir


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