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x86/xen: require ballooned pages for grant maps 

Ballooned pages are always used for grant maps which means the
original frame does not need to be saved in page->index nor restored
after the grant unmap.

This allows the workaround in netback for the conflicting use of the
(unionized) page->index and page->pfmemalloc to be removed.

Signed-off-by: Jennifer Herbert <jennifer.herbert@citrix.com>
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
hifive-unleashed-5.1
Jennifer Herbert 2014-12-24 14:03:16 +00:00 committed by David Vrabel
parent 0bb599fd30
commit 0ae65f49af
2 changed files with 3 additions and 8 deletions
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5
arch/x86/xen/p2m.c
View File

@ -682,9 +682,10 @@ int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
pfn = page_to_pfn(pages[i]);
WARN_ON(PagePrivate(pages[i]));
WARN(pfn_to_mfn(pfn) != INVALID_P2M_ENTRY, "page must be ballooned");
SetPagePrivate(pages[i]);
set_page_private(pages[i], mfn);
pages[i]->index = pfn_to_mfn(pfn);
if (unlikely(!set_phys_to_machine(pfn, FOREIGN_FRAME(mfn)))) {
ret = -ENOMEM;
@ -718,7 +719,7 @@ int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
set_page_private(pages[i], INVALID_P2M_ENTRY);
WARN_ON(!PagePrivate(pages[i]));
ClearPagePrivate(pages[i]);
set_phys_to_machine(pfn, pages[i]->index);
set_phys_to_machine(pfn, INVALID_P2M_ENTRY);
}
if (kunmap_ops)
ret = HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref,

6
drivers/net/xen-netback/netback.c
View File

@ -1241,12 +1241,6 @@ static void xenvif_fill_frags(struct xenvif_queue *queue, struct sk_buff *skb)
/* Take an extra reference to offset network stack's put_page */
get_page(queue->mmap_pages[pending_idx]);
}
/* FIXME: __skb_fill_page_desc set this to true because page->pfmemalloc
* overlaps with "index", and "mapping" is not set. I think mapping
* should be set. If delivered to local stack, it would drop this
* skb in sk_filter unless the socket has the right to use it.
*/
skb->pfmemalloc = false;
}
static int xenvif_get_extras(struct xenvif_queue *queue,