[Xen-devel] [PATCH v2 2/3] x86/HVM: hvm_map_guest_frame_rw() should respect p2m_ioreq_server

["Jan Beulich" <JBeulich@xxxxxxxx>]

Writes to such pages would need to be handed to the emulator, which we're
not prepared to do at this point.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Reviewed-by: Paul Durrant <paul.durrant@xxxxxxxxxx>

--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -2558,7 +2558,8 @@ static void *_hvm_map_guest_frame(unsign
 
     if ( writable )
     {
-        if ( unlikely(p2m_is_discard_write(p2mt)) )
+        if ( unlikely(p2m_is_discard_write(p2mt)) ||
+             unlikely(p2mt == p2m_ioreq_server) )
             *writable = 0;
         else if ( !permanent )
             paging_mark_pfn_dirty(d, _pfn(gfn));



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