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xen/balloon: Avoid OOM when requesting highmem
If highmem pages are requested from the balloon on a system without highmem, the implementation of alloc_xenballooned_pages will allocate all available memory trying to find highmem pages to return. Allow low memory to be returned when highmem pages are requested to avoid this loop. Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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@ -501,7 +501,7 @@ EXPORT_SYMBOL_GPL(balloon_set_new_target);
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* alloc_xenballooned_pages - get pages that have been ballooned out
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* @nr_pages: Number of pages to get
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* @pages: pages returned
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* @highmem: highmem or lowmem pages
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* @highmem: allow highmem pages
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* @return 0 on success, error otherwise
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*/
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int alloc_xenballooned_pages(int nr_pages, struct page **pages, bool highmem)
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@ -511,7 +511,7 @@ int alloc_xenballooned_pages(int nr_pages, struct page **pages, bool highmem)
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mutex_lock(&balloon_mutex);
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while (pgno < nr_pages) {
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page = balloon_retrieve(highmem);
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if (page && PageHighMem(page) == highmem) {
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if (page && (highmem || !PageHighMem(page))) {
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pages[pgno++] = page;
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} else {
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enum bp_state st;
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