xen/arm: compile and run xenbus
bind_evtchn_to_irqhandler can legitimately return 0 (irq 0): it is not
an error.
If Linux is running as an HVM domain and is running as Dom0, use
xenstored_local_init to initialize the xenstore page and event channel.
Changes in v4:
- do not xs_reset_watches on dom0.
Changes in v2:
- refactor xenbus_init.
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
[v5: Fixed case switch indentations]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
diff --git a/drivers/xen/xenbus/xenbus_probe.c b/drivers/xen/xenbus/xenbus_probe.c
index 91d3d654..038b71d 100644
--- a/drivers/xen/xenbus/xenbus_probe.c
+++ b/drivers/xen/xenbus/xenbus_probe.c
@@ -719,17 +719,47 @@
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;
if (!xen_domain())
return -ENODEV;
xenbus_ring_ops_init();
- if (xen_hvm_domain()) {
- uint64_t v = 0;
+ if (xen_pv_domain())
+ usage = PV;
+ if (xen_hvm_domain())
+ usage = HVM;
+ if (xen_hvm_domain() && xen_initial_domain())
+ usage = LOCAL;
+ if (xen_pv_domain() && !xen_start_info->store_evtchn)
+ usage = LOCAL;
+ if (xen_pv_domain() && xen_start_info->store_evtchn)
+ xenstored_ready = 1;
+
+ switch (usage) {
+ case LOCAL:
+ err = xenstored_local_init();
+ if (err)
+ goto out_error;
+ xen_store_interface = mfn_to_virt(xen_store_mfn);
+ break;
+ case 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:
err = hvm_get_parameter(HVM_PARAM_STORE_EVTCHN, &v);
if (err)
goto out_error;
@@ -738,18 +768,12 @@
if (err)
goto out_error;
xen_store_mfn = (unsigned long)v;
- xen_store_interface = ioremap(xen_store_mfn << PAGE_SHIFT, PAGE_SIZE);
- } else {
- xen_store_evtchn = xen_start_info->store_evtchn;
- xen_store_mfn = xen_start_info->store_mfn;
- if (xen_store_evtchn)
- xenstored_ready = 1;
- else {
- err = xenstored_local_init();
- if (err)
- goto out_error;
- }
- xen_store_interface = mfn_to_virt(xen_store_mfn);
+ xen_store_interface =
+ ioremap(xen_store_mfn << PAGE_SHIFT, PAGE_SIZE);
+ break;
+ default:
+ pr_warn("Xenstore state unknown\n");
+ break;
}
/* Initialize the interface to xenstore. */