From: Boris Ostrovsky Date: Wed, 23 Aug 2017 22:27:04 +0000 (-0400) Subject: xen: Don't try to call xen_alloc_p2m_entry() on autotranslating guests X-Git-Tag: v4.14-rc1~118^2~1 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=b194da25ca4812f6307204f9166ec623fd08d5d0;p=linux.git 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 Reviewed-by: Juergen Gross Fixes: aba831a69632 ("xen: remove tests for pvh mode in pure pv paths") --- diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c index ab609255a0f3..f77e499afddd 100644 --- a/drivers/xen/balloon.c +++ b/drivers/xen/balloon.c @@ -664,9 +664,11 @@ int alloc_xenballooned_pages(int nr_pages, struct page **pages) */ BUILD_BUG_ON(XEN_PAGE_SIZE != PAGE_SIZE); - ret = xen_alloc_p2m_entry(page_to_pfn(page)); - if (ret < 0) - goto out_undo; + 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);