[PATCH v4 3/9] xen/arm: temporarily elevate idle_domain privileged during create_domUs

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxx>

create_domUs might call functions that perform XSM checks on the current
domain, which is idle_domain at this time. Temporarily elevate
idle_domain privileges in create_domUs.

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxx>
---
 xen/arch/arm/domain_build.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index b6189b935d..100a4959a8 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -27,6 +27,7 @@
 #include <asm/setup.h>
 #include <asm/cpufeature.h>
 #include <asm/domain_build.h>
+#include <xsm/xsm.h>
 
 #include <xen/irq.h>
 #include <xen/grant_table.h>
@@ -3210,6 +3211,8 @@ void __init create_domUs(void)
     struct dt_device_node *node;
     const struct dt_device_node *chosen = dt_find_node_by_path("/chosen");
 
+    xsm_elevate_priv(current->domain);
+
     BUG_ON(chosen == NULL);
     dt_for_each_child_node(chosen, node)
     {
@@ -3291,6 +3294,8 @@ void __init create_domUs(void)
         if ( construct_domU(d, node) != 0 )
             panic("Could not set up domain %s\n", dt_node_name(node));
     }
+
+    xsm_demote_priv(current->domain);
 }
 
 static int __init construct_dom0(struct domain *d)
-- 
2.25.1