[PATCH v3 05/13] xen/passthrough: rework dom0_pvh_reqs to use it also on ARM

[Julien Grall <julien.grall@linaro.org>]

DOM0 on ARM will have the same requirements as DOM0 PVH when iommu is enabled.
Both PVH and ARM guest has paging mode translate enabled, so Xen can use it
to know if it needs to check the requirements.

Rename the function and remove "pvh" word in the panic message.

Signed-off-by: Julien Grall <julien.grall@linaro.org>
Acked-by: Jan Beulich <jbeulich@suse.com>
Cc: Xiantao Zhang <xiantao.zhang@intel.com>

---
    Changes in v2:
        - IOMMU can be disabled on ARM if the platform doesn't have
        IOMMU.
---
 xen/drivers/passthrough/iommu.c |   13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/xen/drivers/passthrough/iommu.c b/xen/drivers/passthrough/iommu.c
index c70165a..3c63f87 100644
--- a/xen/drivers/passthrough/iommu.c
+++ b/xen/drivers/passthrough/iommu.c
@@ -130,13 +130,17 @@ int iommu_domain_init(struct domain *d)
     return hd->platform_ops->init(d);
 }
 
-static __init void check_dom0_pvh_reqs(struct domain *d)
+static __init void check_dom0_reqs(struct domain *d)
 {
-    if ( !iommu_enabled )
+    if ( !paging_mode_translate(d) )
+        return;
+
+    if ( is_pvh_domain(d) && !iommu_enabled )
         panic("Presently, iommu must be enabled for pvh dom0\n");
 
     if ( iommu_passthrough )
-        panic("For pvh dom0, dom0-passthrough must not be enabled\n");
+        panic("Dom0 uses translate paging mode, dom0-passthrough must not be "
+              "enabled\n");
 
     iommu_dom0_strict = 1;
 }
@@ -145,8 +149,7 @@ void __init iommu_dom0_init(struct domain *d)
 {
     struct hvm_iommu *hd = domain_hvm_iommu(d);
 
-    if ( is_pvh_domain(d) )
-        check_dom0_pvh_reqs(d);
+    check_dom0_reqs(d);
 
     if ( !iommu_enabled )
         return;
-- 
1.7.10.4