x86/shadow: emulate_gva_to_mfn() should respect p2m_ioreq_server

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

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Paul Durrant <paul.durrant@citrix.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Tim Deegan <tim@xen.org>

diff --git a/xen/arch/x86/mm/shadow/hvm.c b/xen/arch/x86/mm/shadow/hvm.c
index 4cc75916b8ff994eb0d38206fa62d11ba206994a..8994cb9f87bf4f499dbcb35260ed81dca2d0823d 100644 (file)
--- 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 vcpu *v, unsigned long vaddr,
     {
         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);