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xen: handle highmem pages correctly when shrinking a domain

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Commit 1058a75f07 ("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 <[email protected]>
Acked-by: Jeremy Fitzhardinge <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Ian Campbell 2009-01-23 16:26:21 +00:00 • committed by Ingo Molnar
commit ff4ce8c332
1 changed files with 7 additions and 4 deletions
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11
drivers/xen/balloon.c
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@ -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. */