[Xen-devel] [PATCH] IOMMU: add missing HVM check

[Jan Beulich <jbeulich@xxxxxxxx>]

Fix an unguarded d->arch.hvm access in assign_device().

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
Split from now withdrawn "x86/HVM: p2m_ram_ro is incompatible with
device pass-through".

--- a/xen/drivers/passthrough/pci.c
+++ b/xen/drivers/passthrough/pci.c
@@ -1488,7 +1488,8 @@ static int assign_device(struct domain *
 
     /* Prevent device assign if mem paging or mem sharing have been 
      * enabled for this domain */
-    if ( unlikely(d->arch.hvm.mem_sharing_enabled ||
+    if ( unlikely((is_hvm_domain(d) &&
+                   d->arch.hvm.mem_sharing_enabled) ||
                   vm_event_check_ring(d->vm_event_paging) ||
                   p2m_get_hostp2m(d)->global_logdirty) )
         return -EXDEV;

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