[Xen-devel] [PATCH v2 7/7] npt/shadow: allow getting foreign page table entries

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

Current npt and shadow code to get an entry will always return
INVALID_MFN for foreign entries. Allow to return the entry mfn for
foreign entries, like it's done for grant table entries.

Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
Cc: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
---
 xen/arch/x86/mm/p2m-pt.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/mm/p2m-pt.c b/xen/arch/x86/mm/p2m-pt.c
index aea8110254..39ef27943e 100644
--- a/xen/arch/x86/mm/p2m-pt.c
+++ b/xen/arch/x86/mm/p2m-pt.c
@@ -865,7 +865,8 @@ pod_retry_l1:
     unmap_domain_page(l1e);
 
     ASSERT(mfn_valid(mfn) || !p2m_is_ram(*t) || p2m_is_paging(*t));
-    return (p2m_is_valid(*t) || p2m_is_grant(*t)) ? mfn : INVALID_MFN;
+    return (p2m_is_valid(*t) || p2m_is_grant(*t) || p2m_is_foreign(*t))
+           ? mfn : INVALID_MFN;
 }
 
 static void p2m_pt_change_entry_type_global(struct p2m_domain *p2m,
-- 
2.20.1


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