From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Vrabel <david.vrabel@citrix.com>
Subject: Re: [PATCH 08/14] xen-netback: use foreign page
 information from the pages themselves
Date: Mon, 12 Jan 2015 17:16:40 +0000
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To: Ian Campbell <Ian.Campbell@citrix.com>
Cc: xen-devel@lists.xenproject.org, Boris Ostrovsky <boris.ostrovsky@oracle.com>, Jenny Herbert <jennifer.herbert@citrix.com>, Jenny Herbert <jenny.herbert@citrix.com>
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On 12/01/15 16:56, Ian Campbell wrote:
> On Mon, 2015-01-12 at 15:43 +0000, David Vrabel wrote:
>> From: Jenny Herbert <jenny.herbert@citrix.com>
>>
>> Use the foreign page flag in netback to get the domid and grant ref
>> needed for the grant copy.  This signficiantly simplifies the netback
>> code and makes netback work with foreign pages from other backends
>> (e.g., blkback).
>>
>> This allows blkback to use iSCSI disks provided by domUs running on
>> the same host.
>>
>> Signed-off-by: Jenny Herbert <jennifer.herbert@citrix.com>
>> Signed-off-by: David Vrabel <david.vrabel@citrix.com>
> 
> I acked v1, has this version changed significantly enough to warrant a
> re-review? (Does seem so on first glance)

The important change is:

v1:

+		if (PageForeign(page)) {
+			get_page_grant_ref(page, &copy_gop->source.domid,
+					   &copy_gop->source.u.ref);

v2:

+		struct xen_page_foreign *foreign;
...
+		foreign = xen_page_foreign(page);
+		if (foreign) {
+			copy_gop->source.domid = foreign->domid;
+			copy_gop->source.u.ref = foreign->gref;

David