# HG changeset patch
# User Brendan Cully <brendan@xxxxxxxxx>
# Date 1215103876 25200
# Node ID ca55cf40cd134b41812c8c4b851d7df51031de07
# Parent 52a388ec09f852ffd7e42a71593c63f21a7b9fad
Add facility to get notification of domain suspend by event channel.
This event channel will be notified when the domain transitions to the
suspended state, which can be much faster than raising VIRQ_DOM_EXC
and waiting for the notification to be propagated via xenstore.
No attempt is made here to prevent multiple subscribers (last one
wins), or to detect that the subscriber has gone away. Userspace tools
should take care.
Signed-off-by: Brendan Cully <brendan@xxxxxxxxx>
diff --git a/tools/libxc/xc_domain.c b/tools/libxc/xc_domain.c
--- a/tools/libxc/xc_domain.c
+++ b/tools/libxc/xc_domain.c
@@ -981,6 +981,17 @@
return do_domctl(xc_handle, &domctl);
}
+int xc_dom_subscribe(int xc_handle, domid_t dom, evtchn_port_t port)
+{
+ DECLARE_DOMCTL;
+
+ domctl.cmd = XEN_DOMCTL_subscribe;
+ domctl.domain = dom;
+ domctl.u.subscribe.port = port;
+
+ return do_domctl(xc_handle, &domctl);
+}
+
/*
* Local variables:
* mode: C
diff --git a/tools/libxc/xenctrl.h b/tools/libxc/xenctrl.h
--- a/tools/libxc/xenctrl.h
+++ b/tools/libxc/xenctrl.h
@@ -810,6 +810,12 @@
int xc_flask_op(int xc_handle, flask_op_t *op);
+/*
+ * Subscribe to state changes in a domain via evtchn.
+ * Returns -1 on failure, in which case errno will be set appropriately.
+ */
+int xc_dom_subscribe(int xc_handle, domid_t domid, evtchn_port_t port);
+
/**************************
* GRANT TABLE OPERATIONS *
**************************/
diff --git a/xen/common/domain.c b/xen/common/domain.c
--- a/xen/common/domain.c
+++ b/xen/common/domain.c
@@ -97,7 +97,13 @@
return;
d->is_shut_down = 1;
- send_guest_global_virq(dom0, VIRQ_DOM_EXC);
+ if ( d->shutdown_code == SHUTDOWN_suspend
+ && d->suspend_evtchn > 0 )
+ {
+ evtchn_set_pending(dom0->vcpu[0], d->suspend_evtchn);
+ }
+ else
+ send_guest_global_virq(dom0, VIRQ_DOM_EXC);
}
static void vcpu_check_shutdown(struct vcpu *v)
diff --git a/xen/common/domctl.c b/xen/common/domctl.c
--- a/xen/common/domctl.c
+++ b/xen/common/domctl.c
@@ -824,6 +824,21 @@
}
break;
+ case XEN_DOMCTL_subscribe:
+ {
+ struct domain *d;
+
+ ret = -ESRCH;
+ d = rcu_lock_domain_by_id(op->domain);
+ if ( d != NULL )
+ {
+ d->suspend_evtchn = op->u.subscribe.port;
+ rcu_unlock_domain(d);
+ ret = 0;
+ }
+ }
+ break;
+
default:
ret = arch_do_domctl(op, u_domctl);
break;
diff --git a/xen/include/public/domctl.h b/xen/include/public/domctl.h
--- a/xen/include/public/domctl.h
+++ b/xen/include/public/domctl.h
@@ -600,6 +600,13 @@
DEFINE_XEN_GUEST_HANDLE(xen_domctl_cpuid_t);
#endif
+#define XEN_DOMCTL_subscribe 29
+struct xen_domctl_subscribe {
+ uint32_t port; /* IN */
+};
+typedef struct xen_domctl_subscribe xen_domctl_subscribe_t;
+DEFINE_XEN_GUEST_HANDLE(xen_domctl_subscribe_t);
+
struct xen_domctl {
uint32_t cmd;
uint32_t interface_version; /* XEN_DOMCTL_INTERFACE_VERSION */
@@ -638,6 +645,7 @@
struct xen_domctl_ext_vcpucontext ext_vcpucontext;
struct xen_domctl_set_opt_feature set_opt_feature;
struct xen_domctl_set_target set_target;
+ struct xen_domctl_subscribe subscribe;
#if defined(__i386__) || defined(__x86_64__)
struct xen_domctl_cpuid cpuid;
#endif
diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h
--- a/xen/include/xen/sched.h
+++ b/xen/include/xen/sched.h
@@ -208,6 +208,10 @@
bool_t is_shutting_down; /* in process of shutting down? */
bool_t is_shut_down; /* fully shut down? */
int shutdown_code;
+
+ /* If this is not 0, send suspend notification here instead of
+ * raising DOM_EXC */
+ int suspend_evtchn;
atomic_t pause_count;
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