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xen/pvcalls: initialize the module and register the xenbus backend

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Keep a list of connected frontends. Use a semaphore to protect list
accesses.

Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
CC: boris.ostrovsky@oracle.com
CC: jgross@suse.com
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
This commit is contained in:
Stefano Stabellini 2017-07-05 13:08:48 -07:00 committed by Boris Ostrovsky
parent 72e59c30df
commit 9be07334f9
1 changed files with 22 additions and 0 deletions
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22
drivers/xen/pvcalls-back.c
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@ -25,6 +25,11 @@
#include <xen/xenbus.h>
#include <xen/interface/io/pvcalls.h>
struct pvcalls_back_global {
struct list_head frontends;
struct semaphore frontends_lock;
} pvcalls_back_global;
static int pvcalls_back_probe(struct xenbus_device *dev,
const struct xenbus_device_id *id)
{
@ -59,3 +64,20 @@ static struct xenbus_driver pvcalls_back_driver = {
.uevent = pvcalls_back_uevent,
.otherend_changed = pvcalls_back_changed,
};
static int __init pvcalls_back_init(void)
{
int ret;
if (!xen_domain())
return -ENODEV;
ret = xenbus_register_backend(&pvcalls_back_driver);
if (ret < 0)
return ret;
sema_init(&pvcalls_back_global.frontends_lock, 1);
INIT_LIST_HEAD(&pvcalls_back_global.frontends);
return 0;
}
module_init(pvcalls_back_init);