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xen: Don't try to call xen_alloc_p2m_entry() on autotranslating guests 

Commit aba831a69632 ("xen: remove tests for pvh mode in pure pv paths")
removed XENFEAT_auto_translated_physmap test in xen_alloc_p2m_entry()
since it is assumed that the routine is never called by non-PV guests.

However, alloc_xenballooned_pages() may make this call on a PVH guest.
Prevent this from happening by adding XENFEAT_auto_translated_physmap
check there.

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Fixes: aba831a69632 ("xen: remove tests for pvh mode in pure pv paths")
This commit is contained in:
Boris Ostrovsky 2017-08-23 18:27:04 -04:00
parent 22f12f0df8
commit b194da25ca
1 changed files with 5 additions and 3 deletions
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2
drivers/xen/balloon.c
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@ -664,9 +664,11 @@ int alloc_xenballooned_pages(int nr_pages, struct page **pages)
*/
BUILD_BUG_ON(XEN_PAGE_SIZE != PAGE_SIZE);
if (!xen_feature(XENFEAT_auto_translated_physmap)) {
ret = xen_alloc_p2m_entry(page_to_pfn(page));
if (ret < 0)
goto out_undo;
}
#endif
} else {
ret = add_ballooned_pages(nr_pages - pgno);