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authorIan Campbell <ian.campbell@citrix.com>2009-01-23 16:26:21 +0000
committerIngo Molnar <mingo@elte.hu>2009-01-23 18:55:28 +0100
commitff4ce8c332859508dc97826ab8b7f42bb9c212c9 (patch)
tree091c7d3adf9c045129b76c1757094dce7792cc08
parent42ef73fe134732b2e91c0326df5fd568da17c4b2 (diff)
xen: handle highmem pages correctly when shrinking a domain
Commit 1058a75f07b9bb8323fb5197be5526220f8b75cf ("xen: actually release memory when shrinking domain") causes a crash if the page being released is a highmem page. If a page is highmem then there is no need to unmap it. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Acked-by: Jeremy Fitzhardinge <jeremy@goop.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--drivers/xen/balloon.c11
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index 8069d520c46..2ba8f95516a 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -299,10 +299,13 @@ static int decrease_reservation(unsigned long nr_pages)
scrub_page(page);
- ret = HYPERVISOR_update_va_mapping(
- (unsigned long)__va(pfn << PAGE_SHIFT),
- __pte_ma(0), 0);
- BUG_ON(ret);
+ if (!PageHighMem(page)) {
+ ret = HYPERVISOR_update_va_mapping(
+ (unsigned long)__va(pfn << PAGE_SHIFT),
+ __pte_ma(0), 0);
+ BUG_ON(ret);
+ }
+
}
/* Ensure that ballooned highmem pages don't have kmaps. */