[Xen-changelog] [xen stable-4.12] IOMMU: add missing HVM check

[patchbot@xxxxxxx]

commit 8382d022aadc6919f26af7c8bfc096e00b0712dc
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Fri Oct 25 11:41:17 2019 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Oct 25 11:41:17 2019 +0200

    IOMMU: add missing HVM check
    
    Fix an unguarded d->arch.hvm access in assign_device().
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    master commit: 41fd1009cd7416b73d745a77c24b4e8d1a296fe6
    master date: 2019-10-02 13:36:59 +0200
---
 xen/drivers/passthrough/pci.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/xen/drivers/passthrough/pci.c b/xen/drivers/passthrough/pci.c
index 8108ed5f9a..d7420bd8bf 100644
--- a/xen/drivers/passthrough/pci.c
+++ b/xen/drivers/passthrough/pci.c
@@ -1452,7 +1452,8 @@ static int assign_device(struct domain *d, u16 seg, u8 
bus, u8 devfn, u32 flag)
 
     /* 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;
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.12

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