diff options
Diffstat (limited to 'drivers/xen/xenbus/xenbus_probe.c')
-rw-r--r-- | drivers/xen/xenbus/xenbus_probe.c | 84 |
1 files changed, 72 insertions, 12 deletions
diff --git a/drivers/xen/xenbus/xenbus_probe.c b/drivers/xen/xenbus/xenbus_probe.c index 3479332113e9..deb9c4ba3a93 100644 --- a/drivers/xen/xenbus/xenbus_probe.c +++ b/drivers/xen/xenbus/xenbus_probe.c @@ -56,14 +56,19 @@ #include <xen/events.h> #include <xen/page.h> +#include <xen/platform_pci.h> +#include <xen/hvm.h> + #include "xenbus_comms.h" #include "xenbus_probe.h" int xen_store_evtchn; -EXPORT_SYMBOL(xen_store_evtchn); +EXPORT_SYMBOL_GPL(xen_store_evtchn); struct xenstore_domain_interface *xen_store_interface; +EXPORT_SYMBOL_GPL(xen_store_interface); + static unsigned long xen_store_mfn; static BLOCKING_NOTIFIER_HEAD(xenstore_chain); @@ -769,7 +774,7 @@ EXPORT_SYMBOL_GPL(unregister_xenstore_notifier); void xenbus_probe(struct work_struct *unused) { - BUG_ON((xenstored_ready <= 0)); + xenstored_ready = 1; /* Enumerate devices in xenstore and watch for changes. */ xenbus_probe_devices(&xenbus_frontend); @@ -779,10 +784,26 @@ void xenbus_probe(struct work_struct *unused) /* Notify others that xenstore is up */ blocking_notifier_call_chain(&xenstore_chain, 0, NULL); } +EXPORT_SYMBOL_GPL(xenbus_probe); + +static int __init xenbus_probe_initcall(void) +{ + if (!xen_domain()) + return -ENODEV; + + if (xen_initial_domain() || xen_hvm_domain()) + return 0; + + xenbus_probe(NULL); + return 0; +} -static int __init xenbus_probe_init(void) +device_initcall(xenbus_probe_initcall); + +static int __init xenbus_init(void) { int err = 0; + unsigned long page = 0; DPRINTK(""); @@ -803,13 +824,50 @@ static int __init xenbus_probe_init(void) * Domain0 doesn't have a store_evtchn or store_mfn yet. */ if (xen_initial_domain()) { - /* dom0 not yet supported */ + struct evtchn_alloc_unbound alloc_unbound; + + /* Allocate Xenstore page */ + page = get_zeroed_page(GFP_KERNEL); + if (!page) + goto out_error; + + xen_store_mfn = xen_start_info->store_mfn = + pfn_to_mfn(virt_to_phys((void *)page) >> + PAGE_SHIFT); + + /* Next allocate a local port which xenstored can bind to */ + alloc_unbound.dom = DOMID_SELF; + alloc_unbound.remote_dom = 0; + + err = HYPERVISOR_event_channel_op(EVTCHNOP_alloc_unbound, + &alloc_unbound); + if (err == -ENOSYS) + goto out_error; + + BUG_ON(err); + xen_store_evtchn = xen_start_info->store_evtchn = + alloc_unbound.port; + + xen_store_interface = mfn_to_virt(xen_store_mfn); } else { - xenstored_ready = 1; - xen_store_evtchn = xen_start_info->store_evtchn; - xen_store_mfn = xen_start_info->store_mfn; + if (xen_hvm_domain()) { + uint64_t v = 0; + err = hvm_get_parameter(HVM_PARAM_STORE_EVTCHN, &v); + if (err) + goto out_error; + xen_store_evtchn = (int)v; + err = hvm_get_parameter(HVM_PARAM_STORE_PFN, &v); + 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; + xen_store_interface = mfn_to_virt(xen_store_mfn); + xenstored_ready = 1; + } } - xen_store_interface = mfn_to_virt(xen_store_mfn); /* Initialize the interface to xenstore. */ err = xs_init(); @@ -819,9 +877,6 @@ static int __init xenbus_probe_init(void) goto out_unreg_back; } - if (!xen_initial_domain()) - xenbus_probe(NULL); - #ifdef CONFIG_XEN_COMPAT_XENFS /* * Create xenfs mountpoint in /proc for compatibility with @@ -839,10 +894,12 @@ static int __init xenbus_probe_init(void) bus_unregister(&xenbus_frontend.bus); out_error: + if (page != 0) + free_page(page); return err; } -postcore_initcall(xenbus_probe_init); +postcore_initcall(xenbus_init); MODULE_LICENSE("GPL"); @@ -950,6 +1007,9 @@ static void wait_for_devices(struct xenbus_driver *xendrv) #ifndef MODULE static int __init boot_wait_for_devices(void) { + if (xen_hvm_domain() && !xen_platform_pci_unplug) + return -ENODEV; + ready_to_wait_for_devices = 1; wait_for_devices(NULL); return 0; |