The owner domain of shared pages is dom_cow, use that for get_page
otherwise the function fails to return the correct page.
Signed-off-by: Tamas K Lengyel <tamas.leng...@intel.com>
---
xen/arch/x86/mm/p2m.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/xen/arch/x86/mm/p2m.c b/xen/arch/x86/mm/p2m.c
index 3119269073..fdeb742707 100644
--- a/xen/arch/x86/mm/p2m.c
+++ b/xen/arch/x86/mm/p2m.c
@@ -594,7 +594,10 @@ struct page_info *p2m_get_page_from_gfn(
if ( p2m_is_ram(*t) && mfn_valid(mfn) )
{
page = mfn_to_page(mfn);
- if ( !get_page(page, p2m->domain) )
+ if ( !get_page(page, p2m->domain) &&
+ /* Page could be shared */
+ (!dom_cow || !p2m_is_shared(*t) ||
+ !get_page(page, dom_cow)) )
page = NULL;
}
put_gfn(p2m->domain, gfn_x(gfn));
--
2.20.1
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