[Qemu-devel] [PATCH v4 3/3] intel_iommu: allow UNMAP notifiers

[Peter Xu <peterx@redhat.com>]

Intel vIOMMU is still lacking of a complete IOMMU notifier mechanism.
Before that is achieved, let's open a door for vhost DMAR support, which
only requires cache invalidations (UNMAP operations).

Meanwhile, converting hw_error() to error_report() and exit(1), to make
the error messages clean and obvious (so no CPU registers will be
dumped).

Signed-off-by: Peter Xu <peterx@redhat.com>
---
 hw/i386/intel_iommu.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index 9d49be7..e4c3681 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -1980,10 +1980,14 @@ static void vtd_iommu_notify_flag_changed(MemoryRegion *iommu,
 {
     VTDAddressSpace *vtd_as = container_of(iommu, VTDAddressSpace, iommu);
 
-    hw_error("Device at bus %s addr %02x.%d requires iommu notifier which "
-             "is currently not supported by intel-iommu emulation",
-             vtd_as->bus->qbus.name, PCI_SLOT(vtd_as->devfn),
-             PCI_FUNC(vtd_as->devfn));
+    if (new & IOMMU_NOTIFIER_MAP) {
+        error_report("Device at bus %s addr %02x.%d requires iommu "
+                     "notifier which is currently not supported by "
+                     "intel-iommu emulation",
+                     vtd_as->bus->qbus.name, PCI_SLOT(vtd_as->devfn),
+                     PCI_FUNC(vtd_as->devfn));
+        exit(1);
+    }
 }
 
 static const VMStateDescription vtd_vmstate = {
-- 
2.7.4