Commit ff4ce8c3 authored Jan 23, 2009 by Ian Campbell Committed by Ingo Molnar Jan 23, 2009

xen: handle highmem pages correctly when shrinking a domain



Commit 1058a75f ("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>

parent 42ef73fe

drivers/xen/balloon.c

+7 −4

Original line number	Diff line number	Diff line
		@@ -299,12 +299,15 @@ static int decrease_reservation(unsigned long nr_pages)

		scrub_page(page);

		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. */
		kmap_flush_unused();
		flush_tlb_all();