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authorDavid Vrabel <david.vrabel@citrix.com>2015-07-22 16:50:37 +0300
committerDavid Vrabel <david.vrabel@citrix.com>2015-10-23 16:20:31 +0300
commit4a69c909deb0dd3cae653d14ac0ff52d5440a19c (patch)
tree13c9a6a80d575d706e8b689604047d0591ffad91 /drivers/xen
parent8edfcf882eb91ec9028c7334f90f6ef3db5b0fcf (diff)
downloadlinux-4a69c909deb0dd3cae653d14ac0ff52d5440a19c.tar.xz
xen/balloon: pre-allocate p2m entries for ballooned pages
Pages returned by alloc_xenballooned_pages() will be used for grant mapping which will call set_phys_to_machine() (in PV guests). Ballooned pages are set as INVALID_P2M_ENTRY in the p2m and thus may be using the (shared) missing tables and a subsequent set_phys_to_machine() will need to allocate new tables. Since the grant mapping may be done from a context that cannot sleep, the p2m entries must already be allocated. Signed-off-by: David Vrabel <david.vrabel@citrix.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Diffstat (limited to 'drivers/xen')
-rw-r--r--drivers/xen/balloon.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index 25fd1bd949d8..f56662324a47 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -602,6 +602,11 @@ int alloc_xenballooned_pages(int nr_pages, struct page **pages)
page = balloon_retrieve(true);
if (page) {
pages[pgno++] = page;
+#ifdef CONFIG_XEN_HAVE_PVMMU
+ ret = xen_alloc_p2m_entry(page_to_pfn(page));
+ if (ret < 0)
+ goto out_undo;
+#endif
} else {
ret = add_ballooned_pages(nr_pages - pgno);
if (ret < 0)