xen: add /proc/xen/xsd_{kva,port} to xenfs
These are used by the userspace xenstore daemon, which runs in dom0.
Xenstored is what's behind the xenfs "xenbus" filesystem.
[ Impact: provide mapping and port to usermode for xenstore ]
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
diff --git a/drivers/xen/xenfs/xenstored.c b/drivers/xen/xenfs/xenstored.c
new file mode 100644
index 0000000..fef20db
--- /dev/null
+++ b/drivers/xen/xenfs/xenstored.c
@@ -0,0 +1,68 @@
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/fs.h>
+
+#include <xen/page.h>
+
+#include "xenfs.h"
+#include "../xenbus/xenbus_comms.h"
+
+static ssize_t xsd_read(struct file *file, char __user *buf,
+ size_t size, loff_t *off)
+{
+ const char *str = (const char *)file->private_data;
+ return simple_read_from_buffer(buf, size, off, str, strlen(str));
+}
+
+static int xsd_release(struct inode *inode, struct file *file)
+{
+ kfree(file->private_data);
+ return 0;
+}
+
+static int xsd_kva_open(struct inode *inode, struct file *file)
+{
+ file->private_data = (void *)kasprintf(GFP_KERNEL, "0x%p",
+ xen_store_interface);
+ if (!file->private_data)
+ return -ENOMEM;
+ return 0;
+}
+
+static int xsd_kva_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ size_t size = vma->vm_end - vma->vm_start;
+
+ 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 xsd_kva_file_ops = {
+ .open = xsd_kva_open,
+ .mmap = xsd_kva_mmap,
+ .read = xsd_read,
+ .release = xsd_release,
+};
+
+static int xsd_port_open(struct inode *inode, struct file *file)
+{
+ file->private_data = (void *)kasprintf(GFP_KERNEL, "%d",
+ xen_store_evtchn);
+ if (!file->private_data)
+ return -ENOMEM;
+ return 0;
+}
+
+const struct file_operations xsd_port_file_ops = {
+ .open = xsd_port_open,
+ .read = xsd_read,
+ .release = xsd_release,
+};