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[Qemu-devel] [PATCH qemu v15 03/17] vfio: Check that IOMMU MR translates

From: Alexey Kardashevskiy
Subject: [Qemu-devel] [PATCH qemu v15 03/17] vfio: Check that IOMMU MR translates to system address space
Date: Mon, 4 Apr 2016 19:33:32 +1000

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 <address@hidden>
Reviewed-by: David Gibson <address@hidden>
* added some spaces

* new to the series
 hw/vfio/common.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 27753d8..23dd738 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -266,6 +266,12 @@ 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

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