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authorStefano Stabellini <stefano.stabellini@eu.citrix.com>2013-08-04 15:39:40 +0100
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2013-08-09 11:23:24 -0400
commitcd9151e26d31048b2b5e00fd02e110e07d2200c9 (patch)
treee1d5d1bc01d0835ffc359aea7efbb0fbb14ba4e5 /include/xen/balloon.h
parent73cc4bb0c79eebe1f0e92b700d9fe8d1c9b061bb (diff)
xen/balloon: set a mapping for ballooned out pages
Currently ballooned out pages are mapped to 0 and have INVALID_P2M_ENTRY in the p2m. These ballooned out pages are used to map foreign grants by gntdev and blkback (see alloc_xenballooned_pages). Allocate a page per cpu and map all the ballooned out pages to the corresponding mfn. Set the p2m accordingly. This way reading from a ballooned out page won't cause a kernel crash (see http://lists.xen.org/archives/html/xen-devel/2012-12/msg01154.html). Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Reviewed-by: David Vrabel <david.vrabel@citrix.com> CC: alex@alex.org.uk CC: dcrisan@flexiant.com Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'include/xen/balloon.h')
-rw-r--r--include/xen/balloon.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/xen/balloon.h b/include/xen/balloon.h
index cc2e1a7e44ec..a4c1c6a93691 100644
--- a/include/xen/balloon.h
+++ b/include/xen/balloon.h
@@ -29,6 +29,9 @@ int alloc_xenballooned_pages(int nr_pages, struct page **pages,
bool highmem);
void free_xenballooned_pages(int nr_pages, struct page **pages);
+struct page *get_balloon_scratch_page(void);
+void put_balloon_scratch_page(void);
+
struct device;
#ifdef CONFIG_XEN_SELFBALLOONING
extern int register_xen_selfballooning(struct device *dev);

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