[Xen-devel] [PATCH v2 3/3] x86/shadow: emulate_gva_to_mfn() should respect p2m_ioreq_server

["Jan Beulich" <JBeulich@xxxxxxxx>]

Writes to such pages need to be handed to the emulator.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
v2: Return BAD_GFN_TO_MFN instead.

--- a/xen/arch/x86/mm/shadow/hvm.c
+++ b/xen/arch/x86/mm/shadow/hvm.c
@@ -338,6 +338,11 @@ static mfn_t emulate_gva_to_mfn(struct v
     {
         return _mfn(BAD_GFN_TO_MFN);
     }
+    if ( p2mt == p2m_ioreq_server )
+    {
+        put_page(page);
+        return _mfn(BAD_GFN_TO_MFN);
+    }
     if ( p2m_is_discard_write(p2mt) )
     {
         put_page(page);



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