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    Subject[PATCH v4 06/10] xen: Initialize xenbus for dom0.
    Date
    From: Juan Quintela <quintela@redhat.com>

    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>
    ---
    drivers/xen/xenbus/xenbus_probe.c | 29 ++++++++++++++++++++++++++++-
    1 files changed, 28 insertions(+), 1 deletions(-)

    diff --git a/drivers/xen/xenbus/xenbus_probe.c b/drivers/xen/xenbus/xenbus_probe.c
    index d409495..d242610 100644
    --- a/drivers/xen/xenbus/xenbus_probe.c
    +++ b/drivers/xen/xenbus/xenbus_probe.c
    @@ -801,6 +801,7 @@ device_initcall(xenbus_probe_initcall);
    static int __init xenbus_init(void)
    {
    int err = 0;
    + unsigned long page = 0;

    DPRINTK("");

    @@ -821,7 +822,31 @@ static int __init xenbus_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 {
    if (xen_hvm_domain()) {
    uint64_t v = 0;
    @@ -867,6 +892,8 @@ static int __init xenbus_init(void)
    bus_unregister(&xenbus_frontend.bus);

    out_error:
    + if (page != 0)
    + free_page(page);
    return err;
    }

    --
    1.5.6.5


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