[PATCH v4 1/3] intel_iommu: Take the bql before registering a new address space

[CLEMENT MATHIEU--DRIF]

Address space creation might end up being called without holding the
bql as it is exposed through the IOMMU ops.

Signed-off-by: Clement Mathieu--Drif <clement.mathieu--d...@eviden.com>
---
 hw/i386/intel_iommu.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index dffd7ee885..cc8c9857e1 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -4238,6 +4238,12 @@ VTDAddressSpace *vtd_find_add_as(IntelIOMMUState *s, 
PCIBus *bus,
         vtd_dev_as->context_cache_entry.context_cache_gen = 0;
         vtd_dev_as->iova_tree = iova_tree_new();
 
+        /*
+         * memory_region_add_subregion_overlap requires the bql,
+         * make sure we own it.
+         */
+        BQL_LOCK_GUARD();
+
         memory_region_init(&vtd_dev_as->root, OBJECT(s), name, UINT64_MAX);
         address_space_init(&vtd_dev_as->as, &vtd_dev_as->root, "vtd-root");
 
-- 
2.49.0