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Subject[PATCH 1/6] xen: Add privcmd device driver
Date
Access to arbitrary hypercalls is currently provided via xenfs. This
adds a standard character device to handle this. The support in xenfs
remains for backward compatibility and uses the device driver code.

Signed-off-by: Bastian Blank <waldi@debian.org>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
---
drivers/xen/Kconfig | 7 ++++++
drivers/xen/Makefile | 2 +
drivers/xen/{xenfs => }/privcmd.c | 39 ++++++++++++++++++++++++++++++++++++-
drivers/xen/privcmd.h | 3 ++
drivers/xen/xenfs/Makefile | 2 +-
drivers/xen/xenfs/super.c | 3 +-
drivers/xen/xenfs/xenfs.h | 1 -
7 files changed, 53 insertions(+), 4 deletions(-)
rename drivers/xen/{xenfs => }/privcmd.c (92%)
create mode 100644 drivers/xen/privcmd.h
diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
index 8795480..a1ced52 100644
--- a/drivers/xen/Kconfig
+++ b/drivers/xen/Kconfig
@@ -86,6 +86,7 @@ config XEN_BACKEND

config XENFS
tristate "Xen filesystem"
+ select XEN_PRIVCMD
default y
help
The xen filesystem provides a way for domains to share
@@ -171,4 +172,10 @@ config XEN_PCIDEV_BACKEND
xen-pciback.hide=(03:00.0)(04:00.0)

If in doubt, say m.
+
+config XEN_PRIVCMD
+ tristate
+ depends on XEN
+ default m
+
endmenu
diff --git a/drivers/xen/Makefile b/drivers/xen/Makefile
index 974fffd..aa31337 100644
--- a/drivers/xen/Makefile
+++ b/drivers/xen/Makefile
@@ -19,7 +19,9 @@ obj-$(CONFIG_XEN_TMEM) += tmem.o
obj-$(CONFIG_SWIOTLB_XEN) += swiotlb-xen.o
obj-$(CONFIG_XEN_DOM0) += pci.o
obj-$(CONFIG_XEN_PCIDEV_BACKEND) += xen-pciback/
+obj-$(CONFIG_XEN_PRIVCMD) += xen-privcmd.o

xen-evtchn-y := evtchn.o
xen-gntdev-y := gntdev.o
xen-gntalloc-y := gntalloc.o
+xen-privcmd-y := privcmd.o
diff --git a/drivers/xen/xenfs/privcmd.c b/drivers/xen/privcmd.c
similarity index 92%
rename from drivers/xen/xenfs/privcmd.c
rename to drivers/xen/privcmd.c
index dbd3b16..4e8d3da 100644
--- a/drivers/xen/xenfs/privcmd.c
+++ b/drivers/xen/privcmd.c
@@ -7,6 +7,7 @@
*/

#include <linux/kernel.h>
+#include <linux/module.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/string.h>
@@ -18,6 +19,7 @@
#include <linux/highmem.h>
#include <linux/pagemap.h>
#include <linux/seq_file.h>
+#include <linux/miscdevice.h>

#include <asm/pgalloc.h>
#include <asm/pgtable.h>
@@ -32,6 +34,10 @@
#include <xen/page.h>
#include <xen/xen-ops.h>

+#include "privcmd.h"
+
+MODULE_LICENSE("GPL");
+
#ifndef HAVE_ARCH_PRIVCMD_MMAP
static int privcmd_enforce_singleshot_mapping(struct vm_area_struct *vma);
#endif
@@ -394,7 +400,38 @@ static int privcmd_enforce_singleshot_mapping(struct vm_area_struct *vma)
}
#endif

-const struct file_operations privcmd_file_ops = {
+const struct file_operations xen_privcmd_fops = {
+ .owner = THIS_MODULE,
.unlocked_ioctl = privcmd_ioctl,
.mmap = privcmd_mmap,
};
+EXPORT_SYMBOL_GPL(xen_privcmd_fops);
+
+static struct miscdevice privcmd_dev = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = "xen/privcmd",
+ .fops = &xen_privcmd_fops,
+};
+
+static int __init privcmd_init(void)
+{
+ int err;
+
+ if (!xen_domain())
+ return -ENODEV;
+
+ err = misc_register(&privcmd_dev);
+ if (err != 0) {
+ printk(KERN_ERR "Could not register Xen privcmd device\n");
+ return err;
+ }
+ return 0;
+}
+
+static void __exit privcmd_exit(void)
+{
+ misc_deregister(&privcmd_dev);
+}
+
+module_init(privcmd_init);
+module_exit(privcmd_exit);
diff --git a/drivers/xen/privcmd.h b/drivers/xen/privcmd.h
new file mode 100644
index 0000000..14facae
--- /dev/null
+++ b/drivers/xen/privcmd.h
@@ -0,0 +1,3 @@
+#include <linux/fs.h>
+
+extern const struct file_operations xen_privcmd_fops;
diff --git a/drivers/xen/xenfs/Makefile b/drivers/xen/xenfs/Makefile
index 4fde944..5d45ff1 100644
--- a/drivers/xen/xenfs/Makefile
+++ b/drivers/xen/xenfs/Makefile
@@ -1,4 +1,4 @@
obj-$(CONFIG_XENFS) += xenfs.o

-xenfs-y = super.o xenbus.o privcmd.o
+xenfs-y = super.o xenbus.o
xenfs-$(CONFIG_XEN_DOM0) += xenstored.o
diff --git a/drivers/xen/xenfs/super.c b/drivers/xen/xenfs/super.c
index 1aa3897..a55fbf9 100644
--- a/drivers/xen/xenfs/super.c
+++ b/drivers/xen/xenfs/super.c
@@ -16,6 +16,7 @@
#include <xen/xen.h>

#include "xenfs.h"
+#include "../privcmd.h"

#include <asm/xen/hypervisor.h>

@@ -84,7 +85,7 @@ static int xenfs_fill_super(struct super_block *sb, void *data, int silent)
[1] = {},
{ "xenbus", &xenbus_file_ops, S_IRUSR|S_IWUSR },
{ "capabilities", &capabilities_file_ops, S_IRUGO },
- { "privcmd", &privcmd_file_ops, S_IRUSR|S_IWUSR },
+ { "privcmd", &xen_privcmd_fops, S_IRUSR|S_IWUSR },
{""},
};
int rc;
diff --git a/drivers/xen/xenfs/xenfs.h b/drivers/xen/xenfs/xenfs.h
index b68aa62..5056306 100644
--- a/drivers/xen/xenfs/xenfs.h
+++ b/drivers/xen/xenfs/xenfs.h
@@ -2,7 +2,6 @@
#define _XENFS_XENBUS_H

extern const struct file_operations xenbus_file_ops;
-extern const struct file_operations privcmd_file_ops;
extern const struct file_operations xsd_kva_file_ops;
extern const struct file_operations xsd_port_file_ops;

--
1.7.7.3


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