[Xen-devel] [PATCH V4 1/2] xenbus: save xenstore local status for later use

[Aurelien Chartier <aurelien.chartier@xxxxxxxxxx>]

Save the xenstore local status computed in xenbus_init. It can then be used
later to check if xenstored is running in this domain.

Signed-off-by: Aurelien Chartier <aurelien.chartier@xxxxxxxxxx>
Reviewed-by: David Vrabel <david.vrabel@xxxxxxxxxx>

Changes in v4:
- Change variable name to xen_store_domain_type
---
 drivers/xen/xenbus/xenbus_comms.h |    1 +
 drivers/xen/xenbus/xenbus_probe.c |   27 ++++++++++++---------------
 drivers/xen/xenbus/xenbus_probe.h |    7 +++++++
 3 files changed, 20 insertions(+), 15 deletions(-)

diff --git a/drivers/xen/xenbus/xenbus_comms.h 
b/drivers/xen/xenbus/xenbus_comms.h
index c8abd3b..e74f9c1 100644
--- a/drivers/xen/xenbus/xenbus_comms.h
+++ b/drivers/xen/xenbus/xenbus_comms.h
@@ -45,6 +45,7 @@ int xb_wait_for_data_to_read(void);
 int xs_input_avail(void);
 extern struct xenstore_domain_interface *xen_store_interface;
 extern int xen_store_evtchn;
+extern enum xenstore_init xen_store_domain_type;
 
 extern const struct file_operations xen_xenbus_fops;
 
diff --git a/drivers/xen/xenbus/xenbus_probe.c 
b/drivers/xen/xenbus/xenbus_probe.c
index 3325884..56cfaaa 100644
--- a/drivers/xen/xenbus/xenbus_probe.c
+++ b/drivers/xen/xenbus/xenbus_probe.c
@@ -69,6 +69,9 @@ EXPORT_SYMBOL_GPL(xen_store_evtchn);
 struct xenstore_domain_interface *xen_store_interface;
 EXPORT_SYMBOL_GPL(xen_store_interface);
 
+enum xenstore_init xen_store_domain_type;
+EXPORT_SYMBOL_GPL(xen_store_domain_type);
+
 static unsigned long xen_store_mfn;
 
 static BLOCKING_NOTIFIER_HEAD(xenstore_chain);
@@ -719,17 +722,11 @@ static int __init xenstored_local_init(void)
        return err;
 }
 
-enum xenstore_init {
-       UNKNOWN,
-       PV,
-       HVM,
-       LOCAL,
-};
 static int __init xenbus_init(void)
 {
        int err = 0;
-       enum xenstore_init usage = UNKNOWN;
        uint64_t v = 0;
+       xen_store_domain_type = XS_UNKNOWN;
 
        if (!xen_domain())
                return -ENODEV;
@@ -737,29 +734,29 @@ static int __init xenbus_init(void)
        xenbus_ring_ops_init();
 
        if (xen_pv_domain())
-               usage = PV;
+               xen_store_domain_type = XS_PV;
        if (xen_hvm_domain())
-               usage = HVM;
+               xen_store_domain_type = XS_HVM;
        if (xen_hvm_domain() && xen_initial_domain())
-               usage = LOCAL;
+               xen_store_domain_type = XS_LOCAL;
        if (xen_pv_domain() && !xen_start_info->store_evtchn)
-               usage = LOCAL;
+               xen_store_domain_type = XS_LOCAL;
        if (xen_pv_domain() && xen_start_info->store_evtchn)
                xenstored_ready = 1;
 
-       switch (usage) {
-       case LOCAL:
+       switch (xen_store_domain_type) {
+       case XS_LOCAL:
                err = xenstored_local_init();
                if (err)
                        goto out_error;
                xen_store_interface = mfn_to_virt(xen_store_mfn);
                break;
-       case PV:
+       case XS_PV:
                xen_store_evtchn = xen_start_info->store_evtchn;
                xen_store_mfn = xen_start_info->store_mfn;
                xen_store_interface = mfn_to_virt(xen_store_mfn);
                break;
-       case HVM:
+       case XS_HVM:
                err = hvm_get_parameter(HVM_PARAM_STORE_EVTCHN, &v);
                if (err)
                        goto out_error;
diff --git a/drivers/xen/xenbus/xenbus_probe.h 
b/drivers/xen/xenbus/xenbus_probe.h
index bb4f92e..146f857 100644
--- a/drivers/xen/xenbus/xenbus_probe.h
+++ b/drivers/xen/xenbus/xenbus_probe.h
@@ -47,6 +47,13 @@ struct xen_bus_type {
        struct bus_type bus;
 };
 
+enum xenstore_init {
+       XS_UNKNOWN,
+       XS_PV,
+       XS_HVM,
+       XS_LOCAL,
+};
+
 extern struct device_attribute xenbus_dev_attrs[];
 
 extern int xenbus_match(struct device *_dev, struct device_driver *_drv);
-- 
1.7.10.4


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