[PATCH 4/5] iommu: set 'hap_pt_share' and 'need_sync' flags earlier in iommu_domain_init()

[Paul Durrant <paul@xxxxxxx>]

From: Paul Durrant <pdurrant@xxxxxxxxxx>

Set these flags prior to the calls to arch_iommu_domain_init() and the
implementation init() method. There is no reason to hide this information from
those functions and the value of 'hap_pt_share' will be needed by a
modification to arch_iommu_domain_init() made in a subsequent patch.

Signed-off-by: Paul Durrant <pdurrant@xxxxxxxxxx>
---
Cc: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/drivers/passthrough/iommu.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

diff --git a/xen/drivers/passthrough/iommu.c b/xen/drivers/passthrough/iommu.c
index 642d5c8331..fd9705b3a9 100644
--- a/xen/drivers/passthrough/iommu.c
+++ b/xen/drivers/passthrough/iommu.c
@@ -174,15 +174,6 @@ int iommu_domain_init(struct domain *d, unsigned int opts)
     hd->node = NUMA_NO_NODE;
 #endif
 
-    ret = arch_iommu_domain_init(d);
-    if ( ret )
-        return ret;
-
-    hd->platform_ops = iommu_get_ops();
-    ret = hd->platform_ops->init(d);
-    if ( ret || is_system_domain(d) )
-        return ret;
-
     /*
      * Use shared page tables for HAP and IOMMU if the global option
      * is enabled (from which we can infer the h/w is capable) and
@@ -202,7 +193,12 @@ int iommu_domain_init(struct domain *d, unsigned int opts)
 
     ASSERT(!(hd->need_sync && hd->hap_pt_share));
 
-    return 0;
+    ret = arch_iommu_domain_init(d);
+    if ( ret )
+        return ret;
+
+    hd->platform_ops = iommu_get_ops();
+    return hd->platform_ops->init(d);
 }
 
 void __hwdom_init iommu_hwdom_init(struct domain *d)
-- 
2.20.1