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xen: Initialize xenbus for dom0.

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Do initial xenbus/xenstore setup in dom0.  In dom0 we need to actually
allocate the xenstore resources, rather than being given them from
outside.

[ Impact: initialize Xenbus ]

Signed-off-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Juan Quintela 2010-09-02 14:53:56 +01:00 committed by Stefano Stabellini
parent 801fd14a72
commit b37a56d6f3
1 changed files with 28 additions and 1 deletions
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29
drivers/xen/xenbus/xenbus_probe.c
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@ -801,6 +801,7 @@ device_initcall(xenbus_probe_initcall);
static int __init xenbus_init(void) static int __init xenbus_init(void)
{ {
int err = 0; int err = 0;
unsigned long page = 0;
DPRINTK(""); DPRINTK("");
@ -821,7 +822,31 @@ static int __init xenbus_init(void)
* Domain0 doesn't have a store_evtchn or store_mfn yet. * Domain0 doesn't have a store_evtchn or store_mfn yet.
*/ */
if (xen_initial_domain()) { 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 { } else {
if (xen_hvm_domain()) { if (xen_hvm_domain()) {
uint64_t v = 0; uint64_t v = 0;
@ -867,6 +892,8 @@ static int __init xenbus_init(void)
bus_unregister(&xenbus_frontend.bus); bus_unregister(&xenbus_frontend.bus);
out_error: out_error:
if (page != 0)
free_page(page);
return err; return err;
} }