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authorDaniel De Graaf <dgdegra@tycho.nsa.gov>2011-03-24 08:10:07 -0400
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2011-03-24 10:36:01 -0400
commitb254244d2682fe975630f176c25a4444cc4e088d (patch)
treeac754c3e5d730cb26ce1f1e8023d8d77b9d55f98 /arch
parenta93e20a83077f57638f8574b1c072ce6712e95ec (diff)
downloadop-kernel-dev-b254244d2682fe975630f176c25a4444cc4e088d.zip
op-kernel-dev-b254244d2682fe975630f176c25a4444cc4e088d.tar.gz
xen/p2m: Allocate p2m tracking pages on override
It is possible to add a p2m override on pages that are currently mapped to INVALID_P2M_ENTRY; in particular, this will happen when using ballooned pages in gntdev. This means that set_phys_to_machine must be used instead of __set_phys_to_machine. Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/xen/p2m.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c
index 215a3ce..2a44edd 100644
--- a/arch/x86/xen/p2m.c
+++ b/arch/x86/xen/p2m.c
@@ -671,7 +671,9 @@ int m2p_add_override(unsigned long mfn, struct page *page)
page->private = mfn;
page->index = pfn_to_mfn(pfn);
- __set_phys_to_machine(pfn, FOREIGN_FRAME(mfn));
+ if (unlikely(!set_phys_to_machine(pfn, FOREIGN_FRAME(mfn))))
+ return -ENOMEM;
+
if (!PageHighMem(page))
/* Just zap old mapping for now */
pte_clear(&init_mm, address, ptep);
@@ -709,7 +711,7 @@ int m2p_remove_override(struct page *page)
spin_lock_irqsave(&m2p_override_lock, flags);
list_del(&page->lru);
spin_unlock_irqrestore(&m2p_override_lock, flags);
- __set_phys_to_machine(pfn, page->index);
+ set_phys_to_machine(pfn, page->index);
if (!PageHighMem(page))
set_pte_at(&init_mm, address, ptep,
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