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[PULL,11/11] vfio: Check that IOMMU MR translates to system address space

Message ID 20160526180137.13473.59414.stgit@gimli.home
State New
Headers show

Commit Message

Alex Williamson May 26, 2016, 6:01 p.m. UTC 
From: Alexey Kardashevskiy <aik@ozlabs.ru>

At the moment IOMMU MR only translate to the system memory.
However if some new code changes this, we will need clear indication why
it is not working so here is the check.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---
 hw/vfio/common.c |    6 ++++++
 1 file changed, 6 insertions(+)
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Patch

diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index e2d5a8d..e51ed3a 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -269,6 +269,12 @@  static void vfio_iommu_map_notify(Notifier *n, void *data)
 
     trace_vfio_iommu_map_notify(iova, iova + iotlb->addr_mask);
 
+    if (iotlb->target_as != &address_space_memory) {
+        error_report("Wrong target AS \"%s\", only system memory is allowed",
+                     iotlb->target_as->name ? iotlb->target_as->name : "none");
+        return;
+    }
+
     /*
      * The IOMMU TLB entry we have just covers translation through
      * this IOMMU to its immediate target.  We need to translate