xen: Add xenbus_backend device

Access for xenstored to the event channel and pre-allocated ring is
managed via xenfs.  This adds its own character device featuring mmap
for the ring and an ioctl for the event channel.

Signed-off-by: Bastian Blank <waldi@debian.org>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

2 files changed, 90 insertions, 0 deletions

diff --git a/drivers/xen/xenbus/Makefile b/drivers/xen/xenbus/Makefile
index a2ea363b9f34..31e2e9050c7a 100644
--- a/drivers/xen/xenbus/Makefile
+++ b/drivers/xen/xenbus/Makefile
@@ -10,4 +10,5 @@ xenbus-objs += xenbus_probe.o
 xenbus-be-objs-$(CONFIG_XEN_BACKEND) += xenbus_probe_backend.o
 xenbus-objs += $(xenbus-be-objs-y)
 
+obj-$(CONFIG_XEN_BACKEND) += xenbus_dev_backend.o
 obj-$(CONFIG_XEN_XENBUS_FRONTEND) += xenbus_probe_frontend.o
diff --git a/drivers/xen/xenbus/xenbus_dev_backend.c b/drivers/xen/xenbus/xenbus_dev_backend.c
new file mode 100644
index 000000000000..a2092bd97693
--- /dev/null
+++ b/drivers/xen/xenbus/xenbus_dev_backend.c
@@ -0,0 +1,89 @@
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/capability.h>
+
+#include <xen/page.h>
+#include <xen/xenbus_dev.h>
+
+#include "xenbus_comms.h"
+
+MODULE_LICENSE("GPL");
+
+static int xenbus_backend_open(struct inode *inode, struct file *filp)
+{
+        if (!capable(CAP_SYS_ADMIN))
+                return -EPERM;
+
+        return nonseekable_open(inode, filp);
+}
+
+static long xenbus_backend_ioctl(struct file *file, unsigned int cmd, unsigned long data)
+{
+        if (!capable(CAP_SYS_ADMIN))
+                return -EPERM;
+
+        switch (cmd) {
+                case IOCTL_XENBUS_BACKEND_EVTCHN:
+                        if (xen_store_evtchn > 0)
+                                return xen_store_evtchn;
+                        return -ENODEV;
+
+                default:
+                        return -ENOTTY;
+        }
+}
+
+static int xenbus_backend_mmap(struct file *file, struct vm_area_struct *vma)
+{
+        size_t size = vma->vm_end - vma->vm_start;
+
+        if (!capable(CAP_SYS_ADMIN))
+                return -EPERM;
+
+        if ((size > PAGE_SIZE) || (vma->vm_pgoff != 0))
+                return -EINVAL;
+
+        if (remap_pfn_range(vma, vma->vm_start,
+                            virt_to_pfn(xen_store_interface),
+                            size, vma->vm_page_prot))
+                return -EAGAIN;
+
+        return 0;
+}
+
+const struct file_operations xenbus_backend_fops = {
+        .open = xenbus_backend_open,
+        .mmap = xenbus_backend_mmap,
+        .unlocked_ioctl = xenbus_backend_ioctl,
+};
+
+static struct miscdevice xenbus_backend_dev = {
+        .minor = MISC_DYNAMIC_MINOR,
+        .name = "xen/xenbus_backend",
+        .fops = &xenbus_backend_fops,
+};
+
+static int __init xenbus_backend_init(void)
+{
+        int err;
+
+        if (!xen_initial_domain())
+                return -ENODEV;
+
+        err = misc_register(&xenbus_backend_dev);
+        if (err)
+                printk(KERN_ERR "Could not register xenbus backend device\n");
+        return err;
+}
+
+static void __exit xenbus_backend_exit(void)
+{
+        misc_deregister(&xenbus_backend_dev);
+}
+
+module_init(xenbus_backend_init);
+module_exit(xenbus_backend_exit);