xen: allow global VIRQ handlers to be delegated to other domains

This patch sends global VIRQs to a domain designated as the VIRQ
handler
instead of sending all global VIRQ events to dom0. This is required in
order to run xenstored in a stubdom, because VIRQ_DOM_EXC must be sent
to xenstored for domain destruction to work properly.

This patch was inspired by the xenstored stubdomain patch series sent
to xen-devel by Alex Zeffertt in 2009.

Signed-off-by: Diego Ongaro <diego.ongaro@citrix.com>
Signed-off-by: Alex Zeffertt <alex.zeffertt@eu.citrix.com>
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Committed-by: Keir Fraser <keir@xen.org>

1 files changed, 17 insertions, 0 deletions

diff --git a/xen/common/domctl.c b/xen/common/domctl.c
index 5b0fc4a511..8001a916cc 100644
--- a/xen/common/domctl.c
+++ b/xen/common/domctl.c
@@ -995,6 +995,23 @@ long do_domctl(XEN_GUEST_HANDLE(xen_domctl_t) u_domctl)
     }
     break;
 
+    case XEN_DOMCTL_set_virq_handler:
+    {
+        struct domain *d;
+        uint32_t virq = op->u.set_virq_handler.virq;
+
+        ret = -ESRCH;
+        d = rcu_lock_domain_by_id(op->domain);
+        if ( d != NULL )
+        {
+            ret = xsm_set_virq_handler(d, virq);
+            if ( !ret )
+                ret = set_global_virq_handler(d, virq);
+            rcu_unlock_domain(d);
+        }
+    }
+    break;
+
     default:
         ret = arch_do_domctl(op, u_domctl);
         break;