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Merge branch 'stable/for-linus-3.3' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen

Browse source 
* 'stable/for-linus-3.3' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen: (37 commits)
  xen/pciback: Expand the warning message to include domain id.
  xen/pciback: Fix "device has been assigned to X domain!" warning
  xen/pciback: Move the PCI_DEV_FLAGS_ASSIGNED ops to the "[un|]bind"
  xen/xenbus: don't reimplement kvasprintf via a fixed size buffer
  xenbus: maximum buffer size is XENSTORE_PAYLOAD_MAX
  xen/xenbus: Reject replies with payload > XENSTORE_PAYLOAD_MAX.
  Xen: consolidate and simplify struct xenbus_driver instantiation
  xen-gntalloc: introduce missing kfree
  xen/xenbus: Fix compile error - missing header for xen_initial_domain()
  xen/netback: Enable netback on HVM guests
  xen/grant-table: Support mappings required by blkback
  xenbus: Use grant-table wrapper functions
  xenbus: Support HVM backends
  xen/xenbus-frontend: Fix compile error with randconfig
  xen/xenbus-frontend: Make error message more clear
  xen/privcmd: Remove unused support for arch specific privcmp mmap
  xen: Add xenbus_backend device
  xen: Add xenbus device driver
  xen: Add privcmd device driver
  xen/gntalloc: fix reference counts on multi-page mappings
  ...
This commit is contained in:
Linus Torvalds 2012-01-10 10:09:59 -08:00
commit 90160371b3
44 changed files with 1516 additions and 268 deletions
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75
Documentation/ABI/stable/sysfs-bus-xen-backend Normal file
View file

@ -0,0 +1,75 @@
What: /sys/bus/xen-backend/devices/*/devtype
Date: Feb 2009
KernelVersion: 2.6.38
Contact: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Description:
The type of the device. e.g., one of: 'vbd' (block),
'vif' (network), or 'vfb' (framebuffer).
What: /sys/bus/xen-backend/devices/*/nodename
Date: Feb 2009
KernelVersion: 2.6.38
Contact: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Description:
XenStore node (under /local/domain/NNN/) for this
backend device.
What: /sys/bus/xen-backend/devices/vbd-*/physical_device
Date: April 2011
KernelVersion: 3.0
Contact: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Description:
The major:minor number (in hexidecimal) of the
physical device providing the storage for this backend
block device.
What: /sys/bus/xen-backend/devices/vbd-*/mode
Date: April 2011
KernelVersion: 3.0
Contact: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Description:
Whether the block device is read-only ('r') or
read-write ('w').
What: /sys/bus/xen-backend/devices/vbd-*/statistics/f_req
Date: April 2011
KernelVersion: 3.0
Contact: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Description:
Number of flush requests from the frontend.
What: /sys/bus/xen-backend/devices/vbd-*/statistics/oo_req
Date: April 2011
KernelVersion: 3.0
Contact: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Description:
Number of requests delayed because the backend was too
busy processing previous requests.
What: /sys/bus/xen-backend/devices/vbd-*/statistics/rd_req
Date: April 2011
KernelVersion: 3.0
Contact: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Description:
Number of read requests from the frontend.
What: /sys/bus/xen-backend/devices/vbd-*/statistics/rd_sect
Date: April 2011
KernelVersion: 3.0
Contact: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Description:
Number of sectors read by the frontend.
What: /sys/bus/xen-backend/devices/vbd-*/statistics/wr_req
Date: April 2011
KernelVersion: 3.0
Contact: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Description:
Number of write requests from the frontend.
What: /sys/bus/xen-backend/devices/vbd-*/statistics/wr_sect
Date: April 2011
KernelVersion: 3.0
Contact: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Description:
Number of sectors written by the frontend.

77
Documentation/ABI/stable/sysfs-devices-system-xen_memory Normal file
View file

@ -0,0 +1,77 @@
What: /sys/devices/system/xen_memory/xen_memory0/max_retry_count
Date: May 2011
KernelVersion: 2.6.39
Contact: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Description:
The maximum number of times the balloon driver will
attempt to increase the balloon before giving up. See
also 'retry_count' below.
A value of zero means retry forever and is the default one.
What: /sys/devices/system/xen_memory/xen_memory0/max_schedule_delay
Date: May 2011
KernelVersion: 2.6.39
Contact: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Description:
The limit that 'schedule_delay' (see below) will be
increased to. The default value is 32 seconds.
What: /sys/devices/system/xen_memory/xen_memory0/retry_count
Date: May 2011
KernelVersion: 2.6.39
Contact: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Description:
The current number of times that the balloon driver
has attempted to increase the size of the balloon.
The default value is one. With max_retry_count being
zero (unlimited), this means that the driver will attempt
to retry with a 'schedule_delay' delay.
What: /sys/devices/system/xen_memory/xen_memory0/schedule_delay
Date: May 2011
KernelVersion: 2.6.39
Contact: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Description:
The time (in seconds) to wait between attempts to
increase the balloon. Each time the balloon cannot be
increased, 'schedule_delay' is increased (until
'max_schedule_delay' is reached at which point it
will use the max value).
What: /sys/devices/system/xen_memory/xen_memory0/target
Date: April 2008
KernelVersion: 2.6.26
Contact: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Description:
The target number of pages to adjust this domain's
memory reservation to.
What: /sys/devices/system/xen_memory/xen_memory0/target_kb
Date: April 2008
KernelVersion: 2.6.26
Contact: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Description:
As target above, except the value is in KiB.
What: /sys/devices/system/xen_memory/xen_memory0/info/current_kb
Date: April 2008
KernelVersion: 2.6.26
Contact: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Description:
Current size (in KiB) of this domain's memory
reservation.
What: /sys/devices/system/xen_memory/xen_memory0/info/high_kb
Date: April 2008
KernelVersion: 2.6.26
Contact: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Description:
Amount (in KiB) of high memory in the balloon.
What: /sys/devices/system/xen_memory/xen_memory0/info/low_kb
Date: April 2008
KernelVersion: 2.6.26
Contact: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Description:
Amount (in KiB) of low (or normal) memory in the
balloon.

2
arch/ia64/include/asm/xen/interface.h
View file

@ -71,7 +71,7 @@
__DEFINE_GUEST_HANDLE(uchar, unsigned char);
__DEFINE_GUEST_HANDLE(uint, unsigned int);
__DEFINE_GUEST_HANDLE(ulong, unsigned long);
__DEFINE_GUEST_HANDLE(u64, unsigned long);
DEFINE_GUEST_HANDLE(char);
DEFINE_GUEST_HANDLE(int);
DEFINE_GUEST_HANDLE(long);

4
arch/x86/xen/Kconfig
View file

@ -29,7 +29,8 @@ config XEN_PVHVM
config XEN_MAX_DOMAIN_MEMORY
int
default 128
default 500 if X86_64
default 64 if X86_32
depends on XEN
help
This only affects the sizing of some bss arrays, the unused
@ -48,3 +49,4 @@ config XEN_DEBUG_FS
help
Enable statistics output and various tuning options in debugfs.
Enabling this option may incur a significant performance overhead.

44
arch/x86/xen/grant-table.c
View file

@ -54,6 +54,20 @@ static int map_pte_fn(pte_t *pte, struct page *pmd_page,
return 0;
}
/*
* This function is used to map shared frames to store grant status. It is
* different from map_pte_fn above, the frames type here is uint64_t.
*/
static int map_pte_fn_status(pte_t *pte, struct page *pmd_page,
unsigned long addr, void *data)
{
uint64_t **frames = (uint64_t **)data;
set_pte_at(&init_mm, addr, pte, mfn_pte((*frames)[0], PAGE_KERNEL));
(*frames)++;
return 0;
}
static int unmap_pte_fn(pte_t *pte, struct page *pmd_page,
unsigned long addr, void *data)
{
@ -64,10 +78,10 @@ static int unmap_pte_fn(pte_t *pte, struct page *pmd_page,
int arch_gnttab_map_shared(unsigned long *frames, unsigned long nr_gframes,
unsigned long max_nr_gframes,
struct grant_entry **__shared)
void **__shared)
{
int rc;
struct grant_entry *shared = *__shared;
void *shared = *__shared;
if (shared == NULL) {
struct vm_struct *area =
@ -83,8 +97,30 @@ int arch_gnttab_map_shared(unsigned long *frames, unsigned long nr_gframes,
return rc;
}
void arch_gnttab_unmap_shared(struct grant_entry *shared,
unsigned long nr_gframes)
int arch_gnttab_map_status(uint64_t *frames, unsigned long nr_gframes,
unsigned long max_nr_gframes,
grant_status_t **__shared)
{
int rc;
grant_status_t *shared = *__shared;
if (shared == NULL) {
/* No need to pass in PTE as we are going to do it
* in apply_to_page_range anyhow. */
struct vm_struct *area =
alloc_vm_area(PAGE_SIZE * max_nr_gframes, NULL);
BUG_ON(area == NULL);
shared = area->addr;
*__shared = shared;
}
rc = apply_to_page_range(&init_mm, (unsigned long)shared,
PAGE_SIZE * nr_gframes,
map_pte_fn_status, &frames);
return rc;
}
void arch_gnttab_unmap(void *shared, unsigned long nr_gframes)
{
apply_to_page_range(&init_mm, (unsigned long)shared,
PAGE_SIZE * nr_gframes, unmap_pte_fn, NULL);

9
drivers/block/xen-blkback/xenbus.c
View file

@ -787,17 +787,14 @@ static const struct xenbus_device_id xen_blkbk_ids[] = {
};
static struct xenbus_driver xen_blkbk = {
.name = "vbd",
.owner = THIS_MODULE,
.ids = xen_blkbk_ids,
static DEFINE_XENBUS_DRIVER(xen_blkbk, ,
.probe = xen_blkbk_probe,
.remove = xen_blkbk_remove,
.otherend_changed = frontend_changed
};
);
int xen_blkif_xenbus_init(void)
{
return xenbus_register_backend(&xen_blkbk);
return xenbus_register_backend(&xen_blkbk_driver);
}

11
drivers/block/xen-blkfront.c
View file

@ -1437,16 +1437,13 @@ static const struct xenbus_device_id blkfront_ids[] = {
{ "" }
};
static struct xenbus_driver blkfront = {
.name = "vbd",
.owner = THIS_MODULE,
.ids = blkfront_ids,
static DEFINE_XENBUS_DRIVER(blkfront, ,
.probe = blkfront_probe,
.remove = blkfront_remove,
.resume = blkfront_resume,
.otherend_changed = blkback_changed,
.is_ready = blkfront_is_ready,
};
);
static int __init xlblk_init(void)
{
@ -1461,7 +1458,7 @@ static int __init xlblk_init(void)
return -ENODEV;
}
ret = xenbus_register_frontend(&blkfront);
ret = xenbus_register_frontend(&blkfront_driver);
if (ret) {
unregister_blkdev(XENVBD_MAJOR, DEV_NAME);
return ret;
@ -1474,7 +1471,7 @@ module_init(xlblk_init);
static void __exit xlblk_exit(void)
{
return xenbus_unregister_driver(&blkfront);
return xenbus_unregister_driver(&blkfront_driver);
}
module_exit(xlblk_exit);

7
drivers/input/misc/xen-kbdfront.c
View file

@ -361,15 +361,12 @@ static const struct xenbus_device_id xenkbd_ids[] = {
{ "" }
};
static struct xenbus_driver xenkbd_driver = {
.name = "vkbd",
.owner = THIS_MODULE,
.ids = xenkbd_ids,
static DEFINE_XENBUS_DRIVER(xenkbd, ,
.probe = xenkbd_probe,
.remove = xenkbd_remove,
.resume = xenkbd_resume,
.otherend_changed = xenkbd_backend_changed,
};
);
static int __init xenkbd_init(void)
{

2
drivers/net/xen-netback/netback.c
View file

@ -1634,7 +1634,7 @@ static int __init netback_init(void)
int rc = 0;
int group;
if (!xen_pv_domain())
if (!xen_domain())
return -ENODEV;
xen_netbk_group_nr = num_online_cpus();

9
drivers/net/xen-netback/xenbus.c
View file

@ -474,17 +474,14 @@ static const struct xenbus_device_id netback_ids[] = {
};
static struct xenbus_driver netback = {
.name = "vif",
.owner = THIS_MODULE,
.ids = netback_ids,
static DEFINE_XENBUS_DRIVER(netback, ,
.probe = netback_probe,
.remove = netback_remove,
.uevent = netback_uevent,
.otherend_changed = frontend_changed,
};
);
int xenvif_xenbus_init(void)
{
return xenbus_register_backend(&netback);
return xenbus_register_backend(&netback_driver);
}

9
drivers/net/xen-netfront.c
View file

@ -1914,7 +1914,7 @@ static void xennet_sysfs_delif(struct net_device *netdev)
#endif /* CONFIG_SYSFS */
static struct xenbus_device_id netfront_ids[] = {
static const struct xenbus_device_id netfront_ids[] = {
{ "vif" },
{ "" }
};
@ -1941,15 +1941,12 @@ static int __devexit xennet_remove(struct xenbus_device *dev)
return 0;
}
static struct xenbus_driver netfront_driver = {
.name = "vif",
.owner = THIS_MODULE,
.ids = netfront_ids,
static DEFINE_XENBUS_DRIVER(netfront, ,
.probe = netfront_probe,
.remove = __devexit_p(xennet_remove),
.resume = netfront_resume,
.otherend_changed = netback_changed,
};
);
static int __init netif_init(void)
{

11
drivers/pci/xen-pcifront.c
View file

@ -1126,14 +1126,11 @@ static const struct xenbus_device_id xenpci_ids[] = {
{""},
};
static struct xenbus_driver xenbus_pcifront_driver = {
.name = "pcifront",
.owner = THIS_MODULE,
.ids = xenpci_ids,
static DEFINE_XENBUS_DRIVER(xenpci, "pcifront",
.probe = pcifront_xenbus_probe,
.remove = pcifront_xenbus_remove,
.otherend_changed = pcifront_backend_changed,
};
);
static int __init pcifront_init(void)
{
@ -1142,12 +1139,12 @@ static int __init pcifront_init(void)
pci_frontend_registrar(1 /* enable */);
return xenbus_register_frontend(&xenbus_pcifront_driver);
return xenbus_register_frontend(&xenpci_driver);
}
static void __exit pcifront_cleanup(void)
{
xenbus_unregister_driver(&xenbus_pcifront_driver);
xenbus_unregister_driver(&xenpci_driver);
pci_frontend_registrar(0 /* disable */);
}
module_init(pcifront_init);

9
drivers/video/xen-fbfront.c
View file

@ -671,20 +671,17 @@ static void xenfb_backend_changed(struct xenbus_device *dev,
}
}
static struct xenbus_device_id xenfb_ids[] = {
static const struct xenbus_device_id xenfb_ids[] = {
{ "vfb" },
{ "" }
};
static struct xenbus_driver xenfb_driver = {
.name = "vfb",
.owner = THIS_MODULE,
.ids = xenfb_ids,
static DEFINE_XENBUS_DRIVER(xenfb, ,
.probe = xenfb_probe,
.remove = xenfb_remove,
.resume = xenfb_resume,
.otherend_changed = xenfb_backend_changed,
};
);
static int __init xenfb_init(void)
{

7
drivers/xen/Kconfig
View file

@ -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

2
drivers/xen/Makefile
View file

@ -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

77
drivers/xen/events.c
View file

@ -87,6 +87,7 @@ enum xen_irq_type {
*/
struct irq_info {
struct list_head list;
int refcnt;
enum xen_irq_type type; /* type */
unsigned irq;
unsigned short evtchn; /* event channel */
@ -406,6 +407,7 @@ static void xen_irq_init(unsigned irq)
panic("Unable to allocate metadata for IRQ%d\n", irq);
info->type = IRQT_UNBOUND;
info->refcnt = -1;
irq_set_handler_data(irq, info);
@ -469,6 +471,8 @@ static void xen_free_irq(unsigned irq)
irq_set_handler_data(irq, NULL);
WARN_ON(info->refcnt > 0);
kfree(info);
/* Legacy IRQ descriptors are managed by the arch. */
@ -637,7 +641,7 @@ int xen_bind_pirq_gsi_to_irq(unsigned gsi,
if (irq != -1) {
printk(KERN_INFO "xen_map_pirq_gsi: returning irq %d for gsi %u\n",
irq, gsi);
goto out; /* XXX need refcount? */
goto out;
}
irq = xen_allocate_irq_gsi(gsi);
@ -939,9 +943,16 @@ static void unbind_from_irq(unsigned int irq)
{
struct evtchn_close close;
int evtchn = evtchn_from_irq(irq);
struct irq_info *info = irq_get_handler_data(irq);
mutex_lock(&irq_mapping_update_lock);
if (info->refcnt > 0) {
info->refcnt--;
if (info->refcnt != 0)
goto done;
}
if (VALID_EVTCHN(evtchn)) {
close.port = evtchn;
if (HYPERVISOR_event_channel_op(EVTCHNOP_close, &close) != 0)
@ -970,6 +981,7 @@ static void unbind_from_irq(unsigned int irq)
xen_free_irq(irq);
done:
mutex_unlock(&irq_mapping_update_lock);
}
@ -1065,6 +1077,69 @@ void unbind_from_irqhandler(unsigned int irq, void *dev_id)
}
EXPORT_SYMBOL_GPL(unbind_from_irqhandler);
int evtchn_make_refcounted(unsigned int evtchn)
{
int irq = evtchn_to_irq[evtchn];
struct irq_info *info;
if (irq == -1)
return -ENOENT;
info = irq_get_handler_data(irq);
if (!info)
return -ENOENT;
WARN_ON(info->refcnt != -1);
info->refcnt = 1;
return 0;
}
EXPORT_SYMBOL_GPL(evtchn_make_refcounted);
int evtchn_get(unsigned int evtchn)
{
int irq;
struct irq_info *info;
int err = -ENOENT;
if (evtchn >= NR_EVENT_CHANNELS)
return -EINVAL;
mutex_lock(&irq_mapping_update_lock);
irq = evtchn_to_irq[evtchn];
if (irq == -1)
goto done;
info = irq_get_handler_data(irq);
if (!info)
goto done;
err = -EINVAL;
if (info->refcnt <= 0)
goto done;
info->refcnt++;
err = 0;
done:
mutex_unlock(&irq_mapping_update_lock);
return err;
}
EXPORT_SYMBOL_GPL(evtchn_get);
void evtchn_put(unsigned int evtchn)
{
int irq = evtchn_to_irq[evtchn];
if (WARN_ON(irq == -1))
return;
unbind_from_irq(irq);
}
EXPORT_SYMBOL_GPL(evtchn_put);
void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector)
{
int irq = per_cpu(ipi_to_irq, cpu)[vector];

2
drivers/xen/evtchn.c
View file

@ -268,7 +268,7 @@ static int evtchn_bind_to_user(struct per_user_data *u, int port)
rc = bind_evtchn_to_irqhandler(port, evtchn_interrupt, IRQF_DISABLED,
u->name, (void *)(unsigned long)port);
if (rc >= 0)
rc = 0;
rc = evtchn_make_refcounted(port);
return rc;
}

121
drivers/xen/gntalloc.c
View file

@ -74,7 +74,7 @@ MODULE_PARM_DESC(limit, "Maximum number of grants that may be allocated by "
"the gntalloc device");
static LIST_HEAD(gref_list);
static DEFINE_SPINLOCK(gref_lock);
static DEFINE_MUTEX(gref_mutex);
static int gref_size;
struct notify_info {
@ -99,6 +99,12 @@ struct gntalloc_file_private_data {
uint64_t index;
};
struct gntalloc_vma_private_data {
struct gntalloc_gref *gref;
int users;
int count;
};
static void __del_gref(struct gntalloc_gref *gref);
static void do_cleanup(void)
@ -143,15 +149,15 @@ static int add_grefs(struct ioctl_gntalloc_alloc_gref *op,
}
/* Add to gref lists. */
spin_lock(&gref_lock);
mutex_lock(&gref_mutex);
list_splice_tail(&queue_gref, &gref_list);
list_splice_tail(&queue_file, &priv->list);
spin_unlock(&gref_lock);
mutex_unlock(&gref_mutex);
return 0;
undo:
spin_lock(&gref_lock);
mutex_lock(&gref_mutex);
gref_size -= (op->count - i);
list_for_each_entry(gref, &queue_file, next_file) {
@ -167,7 +173,7 @@ static int add_grefs(struct ioctl_gntalloc_alloc_gref *op,
*/
if (unlikely(!list_empty(&queue_gref)))
list_splice_tail(&queue_gref, &gref_list);
spin_unlock(&gref_lock);
mutex_unlock(&gref_mutex);
return rc;
}
@ -178,8 +184,10 @@ static void __del_gref(struct gntalloc_gref *gref)
tmp[gref->notify.pgoff] = 0;
kunmap(gref->page);
}
if (gref->notify.flags & UNMAP_NOTIFY_SEND_EVENT)
if (gref->notify.flags & UNMAP_NOTIFY_SEND_EVENT) {
notify_remote_via_evtchn(gref->notify.event);
evtchn_put(gref->notify.event);
}
gref->notify.flags = 0;
@ -189,6 +197,8 @@ static void __del_gref(struct gntalloc_gref *gref)
if (!gnttab_end_foreign_access_ref(gref->gref_id, 0))
return;
gnttab_free_grant_reference(gref->gref_id);
}
gref_size--;
@ -251,7 +261,7 @@ static int gntalloc_release(struct inode *inode, struct file *filp)
pr_debug("%s: priv %p\n", __func__, priv);
spin_lock(&gref_lock);
mutex_lock(&gref_mutex);
while (!list_empty(&priv->list)) {
gref = list_entry(priv->list.next,
struct gntalloc_gref, next_file);
@ -261,7 +271,7 @@ static int gntalloc_release(struct inode *inode, struct file *filp)
__del_gref(gref);
}
kfree(priv);
spin_unlock(&gref_lock);
mutex_unlock(&gref_mutex);
return 0;
}
@ -286,21 +296,21 @@ static long gntalloc_ioctl_alloc(struct gntalloc_file_private_data *priv,
goto out;
}
spin_lock(&gref_lock);
mutex_lock(&gref_mutex);
/* Clean up pages that were at zero (local) users but were still mapped
* by remote domains. Since those pages count towards the limit that we
* are about to enforce, removing them here is a good idea.
*/
do_cleanup();
if (gref_size + op.count > limit) {
spin_unlock(&gref_lock);
mutex_unlock(&gref_mutex);
rc = -ENOSPC;
goto out_free;
}
gref_size += op.count;
op.index = priv->index;
priv->index += op.count * PAGE_SIZE;
spin_unlock(&gref_lock);
mutex_unlock(&gref_mutex);
rc = add_grefs(&op, gref_ids, priv);
if (rc < 0)
@ -343,7 +353,7 @@ static long gntalloc_ioctl_dealloc(struct gntalloc_file_private_data *priv,
goto dealloc_grant_out;
}
spin_lock(&gref_lock);
mutex_lock(&gref_mutex);
gref = find_grefs(priv, op.index, op.count);
if (gref) {
/* Remove from the file list only, and decrease reference count.
@ -363,7 +373,7 @@ static long gntalloc_ioctl_dealloc(struct gntalloc_file_private_data *priv,
do_cleanup();
spin_unlock(&gref_lock);
mutex_unlock(&gref_mutex);
dealloc_grant_out:
return rc;
}
@ -383,7 +393,7 @@ static long gntalloc_ioctl_unmap_notify(struct gntalloc_file_private_data *priv,
index = op.index & ~(PAGE_SIZE - 1);
pgoff = op.index & (PAGE_SIZE - 1);
spin_lock(&gref_lock);
mutex_lock(&gref_mutex);
gref = find_grefs(priv, index, 1);
if (!gref) {
@ -396,12 +406,30 @@ static long gntalloc_ioctl_unmap_notify(struct gntalloc_file_private_data *priv,
goto unlock_out;
}
/* We need to grab a reference to the event channel we are going to use
* to send the notify before releasing the reference we may already have
* (if someone has called this ioctl twice). This is required so that
* it is possible to change the clear_byte part of the notification
* without disturbing the event channel part, which may now be the last
* reference to that event channel.
*/
if (op.action & UNMAP_NOTIFY_SEND_EVENT) {
if (evtchn_get(op.event_channel_port)) {
rc = -EINVAL;
goto unlock_out;
}
}
if (gref->notify.flags & UNMAP_NOTIFY_SEND_EVENT)
evtchn_put(gref->notify.event);
gref->notify.flags = op.action;
gref->notify.pgoff = pgoff;
gref->notify.event = op.event_channel_port;
rc = 0;
unlock_out:
spin_unlock(&gref_lock);
mutex_unlock(&gref_mutex);
return rc;
}
@ -429,26 +457,40 @@ static long gntalloc_ioctl(struct file *filp, unsigned int cmd,
static void gntalloc_vma_open(struct vm_area_struct *vma)
{
struct gntalloc_gref *gref = vma->vm_private_data;
if (!gref)
struct gntalloc_vma_private_data *priv = vma->vm_private_data;
if (!priv)
return;
spin_lock(&gref_lock);
gref->users++;
spin_unlock(&gref_lock);
mutex_lock(&gref_mutex);
priv->users++;
mutex_unlock(&gref_mutex);
}
static void gntalloc_vma_close(struct vm_area_struct *vma)
{
struct gntalloc_gref *gref = vma->vm_private_data;
if (!gref)
struct gntalloc_vma_private_data *priv = vma->vm_private_data;
struct gntalloc_gref *gref, *next;
int i;
if (!priv)
return;
spin_lock(&gref_lock);
gref->users--;
if (gref->users == 0)
__del_gref(gref);
spin_unlock(&gref_lock);
mutex_lock(&gref_mutex);
priv->users--;
if (priv->users == 0) {
gref = priv->gref;
for (i = 0; i < priv->count; i++) {
gref->users--;
next = list_entry(gref->next_gref.next,
struct gntalloc_gref, next_gref);
if (gref->users == 0)
__del_gref(gref);
gref = next;
}
kfree(priv);
}
mutex_unlock(&gref_mutex);
}
static struct vm_operations_struct gntalloc_vmops = {
@ -459,30 +501,41 @@ static struct vm_operations_struct gntalloc_vmops = {
static int gntalloc_mmap(struct file *filp, struct vm_area_struct *vma)
{
struct gntalloc_file_private_data *priv = filp->private_data;
struct gntalloc_vma_private_data *vm_priv;
struct gntalloc_gref *gref;
int count = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
int rv, i;
pr_debug("%s: priv %p, page %lu+%d\n", __func__,
priv, vma->vm_pgoff, count);
if (!(vma->vm_flags & VM_SHARED)) {
printk(KERN_ERR "%s: Mapping must be shared.\n", __func__);
return -EINVAL;
}
spin_lock(&gref_lock);
vm_priv = kmalloc(sizeof(*vm_priv), GFP_KERNEL);
if (!vm_priv)
return -ENOMEM;
mutex_lock(&gref_mutex);
pr_debug("%s: priv %p,%p, page %lu+%d\n", __func__,
priv, vm_priv, vma->vm_pgoff, count);
gref = find_grefs(priv, vma->vm_pgoff << PAGE_SHIFT, count);
if (gref == NULL) {
rv = -ENOENT;
pr_debug("%s: Could not find grant reference",
__func__);
kfree(vm_priv);
goto out_unlock;
}
vma->vm_private_data = gref;
vm_priv->gref = gref;
vm_priv->users = 1;
vm_priv->count = count;
vma->vm_flags |= VM_RESERVED;
vma->vm_private_data = vm_priv;
vma->vm_flags |= VM_RESERVED | VM_DONTEXPAND;
vma->vm_ops = &gntalloc_vmops;
@ -499,7 +552,7 @@ static int gntalloc_mmap(struct file *filp, struct vm_area_struct *vma)
rv = 0;
out_unlock:
spin_unlock(&gref_lock);
mutex_unlock(&gref_mutex);
return rv;
}

34
drivers/xen/gntdev.c
View file

@ -193,8 +193,10 @@ static void gntdev_put_map(struct grant_map *map)
atomic_sub(map->count, &pages_mapped);
if (map->notify.flags & UNMAP_NOTIFY_SEND_EVENT)
if (map->notify.flags & UNMAP_NOTIFY_SEND_EVENT) {
notify_remote_via_evtchn(map->notify.event);
evtchn_put(map->notify.event);
}
if (map->pages) {
if (!use_ptemod)
@ -312,7 +314,8 @@ static int __unmap_grant_pages(struct grant_map *map, int offset, int pages)
}
}
err = gnttab_unmap_refs(map->unmap_ops + offset, map->pages + offset, pages);
err = gnttab_unmap_refs(map->unmap_ops + offset, map->pages + offset,
pages, true);
if (err)
return err;
@ -599,6 +602,8 @@ static long gntdev_ioctl_notify(struct gntdev_priv *priv, void __user *u)
struct ioctl_gntdev_unmap_notify op;
struct grant_map *map;
int rc;
int out_flags;
unsigned int out_event;
if (copy_from_user(&op, u, sizeof(op)))
return -EFAULT;
@ -606,6 +611,21 @@ static long gntdev_ioctl_notify(struct gntdev_priv *priv, void __user *u)
if (op.action & ~(UNMAP_NOTIFY_CLEAR_BYTE|UNMAP_NOTIFY_SEND_EVENT))
return -EINVAL;
/* We need to grab a reference to the event channel we are going to use
* to send the notify before releasing the reference we may already have
* (if someone has called this ioctl twice). This is required so that
* it is possible to change the clear_byte part of the notification
* without disturbing the event channel part, which may now be the last
* reference to that event channel.
*/
if (op.action & UNMAP_NOTIFY_SEND_EVENT) {
if (evtchn_get(op.event_channel_port))
return -EINVAL;
}
out_flags = op.action;
out_event = op.event_channel_port;
spin_lock(&priv->lock);
list_for_each_entry(map, &priv->maps, next) {
@ -624,12 +644,22 @@ static long gntdev_ioctl_notify(struct gntdev_priv *priv, void __user *u)
goto unlock_out;
}
out_flags = map->notify.flags;
out_event = map->notify.event;
map->notify.flags = op.action;
map->notify.addr = op.index - (map->index << PAGE_SHIFT);
map->notify.event = op.event_channel_port;
rc = 0;
unlock_out:
spin_unlock(&priv->lock);
/* Drop the reference to the event channel we did not save in the map */
if (out_flags & UNMAP_NOTIFY_SEND_EVENT)
evtchn_put(out_event);
return rc;
}

520
drivers/xen/grant-table.c
View file

@ -44,16 +44,19 @@
#include <xen/page.h>
#include <xen/grant_table.h>
#include <xen/interface/memory.h>
#include <xen/hvc-console.h>
#include <asm/xen/hypercall.h>
#include <asm/pgtable.h>
#include <asm/sync_bitops.h>
/* External tools reserve first few grant table entries. */
#define NR_RESERVED_ENTRIES 8
#define GNTTAB_LIST_END 0xffffffff
#define GREFS_PER_GRANT_FRAME (PAGE_SIZE / sizeof(struct grant_entry))
#define GREFS_PER_GRANT_FRAME \
(grant_table_version == 1 ? \
(PAGE_SIZE / sizeof(struct grant_entry_v1)) : \
(PAGE_SIZE / sizeof(union grant_entry_v2)))
static grant_ref_t **gnttab_list;
static unsigned int nr_grant_frames;
@ -64,13 +67,97 @@ static DEFINE_SPINLOCK(gnttab_list_lock);
unsigned long xen_hvm_resume_frames;
EXPORT_SYMBOL_GPL(xen_hvm_resume_frames);
static struct grant_entry *shared;
static union {
struct grant_entry_v1 *v1;
union grant_entry_v2 *v2;
void *addr;
} gnttab_shared;
/*This is a structure of function pointers for grant table*/
struct gnttab_ops {
/*
* Mapping a list of frames for storing grant entries. Frames parameter
* is used to store grant table address when grant table being setup,
* nr_gframes is the number of frames to map grant table. Returning
* GNTST_okay means success and negative value means failure.
*/
int (*map_frames)(unsigned long *frames, unsigned int nr_gframes);
/*
* Release a list of frames which are mapped in map_frames for grant
* entry status.
*/
void (*unmap_frames)(void);
/*
* Introducing a valid entry into the grant table, granting the frame of
* this grant entry to domain for accessing or transfering. Ref
* parameter is reference of this introduced grant entry, domid is id of
* granted domain, frame is the page frame to be granted, and flags is
* status of the grant entry to be updated.
*/
void (*update_entry)(grant_ref_t ref, domid_t domid,
unsigned long frame, unsigned flags);
/*
* Stop granting a grant entry to domain for accessing. Ref parameter is
* reference of a grant entry whose grant access will be stopped,
* readonly is not in use in this function. If the grant entry is
* currently mapped for reading or writing, just return failure(==0)
* directly and don't tear down the grant access. Otherwise, stop grant
* access for this entry and return success(==1).
*/
int (*end_foreign_access_ref)(grant_ref_t ref, int readonly);
/*
* Stop granting a grant entry to domain for transfer. Ref parameter is
* reference of a grant entry whose grant transfer will be stopped. If
* tranfer has not started, just reclaim the grant entry and return
* failure(==0). Otherwise, wait for the transfer to complete and then
* return the frame.
*/
unsigned long (*end_foreign_transfer_ref)(grant_ref_t ref);
/*
* Query the status of a grant entry. Ref parameter is reference of
* queried grant entry, return value is the status of queried entry.
* Detailed status(writing/reading) can be gotten from the return value
* by bit operations.
*/
int (*query_foreign_access)(grant_ref_t ref);
/*
* Grant a domain to access a range of bytes within the page referred by
* an available grant entry. Ref parameter is reference of a grant entry
* which will be sub-page accessed, domid is id of grantee domain, frame
* is frame address of subpage grant, flags is grant type and flag
* information, page_off is offset of the range of bytes, and length is
* length of bytes to be accessed.
*/
void (*update_subpage_entry)(grant_ref_t ref, domid_t domid,
unsigned long frame, int flags,
unsigned page_off, unsigned length);
/*
* Redirect an available grant entry on domain A to another grant
* reference of domain B, then allow domain C to use grant reference
* of domain B transitively. Ref parameter is an available grant entry
* reference on domain A, domid is id of domain C which accesses grant
* entry transitively, flags is grant type and flag information,
* trans_domid is id of domain B whose grant entry is finally accessed
* transitively, trans_gref is grant entry transitive reference of
* domain B.
*/
void (*update_trans_entry)(grant_ref_t ref, domid_t domid, int flags,
domid_t trans_domid, grant_ref_t trans_gref);
};
static struct gnttab_ops *gnttab_interface;
/*This reflects status of grant entries, so act as a global value*/
static grant_status_t *grstatus;
static int grant_table_version;
static struct gnttab_free_callback *gnttab_free_callback_list;
static int gnttab_expand(unsigned int req_entries);
#define RPP (PAGE_SIZE / sizeof(grant_ref_t))
#define SPP (PAGE_SIZE / sizeof(grant_status_t))
static inline grant_ref_t *__gnttab_entry(grant_ref_t entry)
{
@ -142,23 +229,33 @@ static void put_free_entry(grant_ref_t ref)
spin_unlock_irqrestore(&gnttab_list_lock, flags);
}
static void update_grant_entry(grant_ref_t ref, domid_t domid,
unsigned long frame, unsigned flags)
/*
* Following applies to gnttab_update_entry_v1 and gnttab_update_entry_v2.
* Introducing a valid entry into the grant table:
* 1. Write ent->domid.
* 2. Write ent->frame:
* GTF_permit_access: Frame to which access is permitted.
* GTF_accept_transfer: Pseudo-phys frame slot being filled by new
* frame, or zero if none.
* 3. Write memory barrier (WMB).
* 4. Write ent->flags, inc. valid type.
*/
static void gnttab_update_entry_v1(grant_ref_t ref, domid_t domid,
unsigned long frame, unsigned flags)
{
/*
* Introducing a valid entry into the grant table:
* 1. Write ent->domid.
* 2. Write ent->frame:
* GTF_permit_access: Frame to which access is permitted.
* GTF_accept_transfer: Pseudo-phys frame slot being filled by new
* frame, or zero if none.
* 3. Write memory barrier (WMB).
* 4. Write ent->flags, inc. valid type.
*/
shared[ref].frame = frame;
shared[ref].domid = domid;
gnttab_shared.v1[ref].domid = domid;
gnttab_shared.v1[ref].frame = frame;
wmb();
shared[ref].flags = flags;
gnttab_shared.v1[ref].flags = flags;
}
static void gnttab_update_entry_v2(grant_ref_t ref, domid_t domid,
unsigned long frame, unsigned flags)
{
gnttab_shared.v2[ref].hdr.domid = domid;
gnttab_shared.v2[ref].full_page.frame = frame;
wmb();
gnttab_shared.v2[ref].hdr.flags = GTF_permit_access | flags;
}
/*
@ -167,7 +264,7 @@ static void update_grant_entry(grant_ref_t ref, domid_t domid,
void gnttab_grant_foreign_access_ref(grant_ref_t ref, domid_t domid,
unsigned long frame, int readonly)
{
update_grant_entry(ref, domid, frame,
gnttab_interface->update_entry(ref, domid, frame,
GTF_permit_access | (readonly ? GTF_readonly : 0));
}
EXPORT_SYMBOL_GPL(gnttab_grant_foreign_access_ref);
@ -187,31 +284,184 @@ int gnttab_grant_foreign_access(domid_t domid, unsigned long frame,
}
EXPORT_SYMBOL_GPL(gnttab_grant_foreign_access);
void gnttab_update_subpage_entry_v2(grant_ref_t ref, domid_t domid,
unsigned long frame, int flags,
unsigned page_off,
unsigned length)
{
gnttab_shared.v2[ref].sub_page.frame = frame;
gnttab_shared.v2[ref].sub_page.page_off = page_off;
gnttab_shared.v2[ref].sub_page.length = length;
gnttab_shared.v2[ref].hdr.domid = domid;
wmb();
gnttab_shared.v2[ref].hdr.flags =
GTF_permit_access | GTF_sub_page | flags;
}
int gnttab_grant_foreign_access_subpage_ref(grant_ref_t ref, domid_t domid,
unsigned long frame, int flags,
unsigned page_off,
unsigned length)
{
if (flags & (GTF_accept_transfer | GTF_reading |
GTF_writing | GTF_transitive))
return -EPERM;
if (gnttab_interface->update_subpage_entry == NULL)
return -ENOSYS;
gnttab_interface->update_subpage_entry(ref, domid, frame, flags,
page_off, length);
return 0;
}
EXPORT_SYMBOL_GPL(gnttab_grant_foreign_access_subpage_ref);
int gnttab_grant_foreign_access_subpage(domid_t domid, unsigned long frame,
int flags, unsigned page_off,
unsigned length)
{
int ref, rc;
ref = get_free_entries(1);
if (unlikely(ref < 0))
return -ENOSPC;
rc = gnttab_grant_foreign_access_subpage_ref(ref, domid, frame, flags,
page_off, length);
if (rc < 0) {
put_free_entry(ref);
return rc;
}
return ref;
}
EXPORT_SYMBOL_GPL(gnttab_grant_foreign_access_subpage);
bool gnttab_subpage_grants_available(void)
{
return gnttab_interface->update_subpage_entry != NULL;
}
EXPORT_SYMBOL_GPL(gnttab_subpage_grants_available);
void gnttab_update_trans_entry_v2(grant_ref_t ref, domid_t domid,
int flags, domid_t trans_domid,
grant_ref_t trans_gref)
{
gnttab_shared.v2[ref].transitive.trans_domid = trans_domid;
gnttab_shared.v2[ref].transitive.gref = trans_gref;
gnttab_shared.v2[ref].hdr.domid = domid;
wmb();
gnttab_shared.v2[ref].hdr.flags =
GTF_permit_access | GTF_transitive | flags;
}
int gnttab_grant_foreign_access_trans_ref(grant_ref_t ref, domid_t domid,
int flags, domid_t trans_domid,
grant_ref_t trans_gref)
{
if (flags & (GTF_accept_transfer | GTF_reading |
GTF_writing | GTF_sub_page))
return -EPERM;
if (gnttab_interface->update_trans_entry == NULL)
return -ENOSYS;
gnttab_interface->update_trans_entry(ref, domid, flags, trans_domid,
trans_gref);
return 0;
}
EXPORT_SYMBOL_GPL(gnttab_grant_foreign_access_trans_ref);
int gnttab_grant_foreign_access_trans(domid_t domid, int flags,
domid_t trans_domid,
grant_ref_t trans_gref)
{
int ref, rc;
ref = get_free_entries(1);
if (unlikely(ref < 0))
return -ENOSPC;
rc = gnttab_grant_foreign_access_trans_ref(ref, domid, flags,
trans_domid, trans_gref);
if (rc < 0) {
put_free_entry(ref);
return rc;
}
return ref;
}
EXPORT_SYMBOL_GPL(gnttab_grant_foreign_access_trans);
bool gnttab_trans_grants_available(void)
{
return gnttab_interface->update_trans_entry != NULL;
}
EXPORT_SYMBOL_GPL(gnttab_trans_grants_available);
static int gnttab_query_foreign_access_v1(grant_ref_t ref)
{
return gnttab_shared.v1[ref].flags & (GTF_reading|GTF_writing);
}
static int gnttab_query_foreign_access_v2(grant_ref_t ref)
{
return grstatus[ref] & (GTF_reading|GTF_writing);
}
int gnttab_query_foreign_access(grant_ref_t ref)
{
u16 nflags;
nflags = shared[ref].flags;
return nflags & (GTF_reading|GTF_writing);
return gnttab_interface->query_foreign_access(ref);
}
EXPORT_SYMBOL_GPL(gnttab_query_foreign_access);
int gnttab_end_foreign_access_ref(grant_ref_t ref, int readonly)
static int gnttab_end_foreign_access_ref_v1(grant_ref_t ref, int readonly)
{
u16 flags, nflags;
u16 *pflags;
nflags = shared[ref].flags;
pflags = &gnttab_shared.v1[ref].flags;
nflags = *pflags;
do {
flags = nflags;
if (flags & (GTF_reading|GTF_writing)) {
printk(KERN_ALERT "WARNING: g.e. still in use!\n");
return 0;
}
} while ((nflags = sync_cmpxchg(&shared[ref].flags, flags, 0)) != flags);
} while ((nflags = sync_cmpxchg(pflags, flags, 0)) != flags);
return 1;
}
static int gnttab_end_foreign_access_ref_v2(grant_ref_t ref, int readonly)
{
gnttab_shared.v2[ref].hdr.flags = 0;
mb();
if (grstatus[ref] & (GTF_reading|GTF_writing)) {
return 0;
} else {
/* The read of grstatus needs to have acquire
semantics. On x86, reads already have
that, and we just need to protect against
compiler reorderings. On other
architectures we may need a full
barrier. */
#ifdef CONFIG_X86
barrier();
#else
mb();
#endif
}
return 1;
}
int gnttab_end_foreign_access_ref(grant_ref_t ref, int readonly)
{
return gnttab_interface->end_foreign_access_ref(ref, readonly);
}
EXPORT_SYMBOL_GPL(gnttab_end_foreign_access_ref);
void gnttab_end_foreign_access(grant_ref_t ref, int readonly,
@ -246,37 +496,76 @@ EXPORT_SYMBOL_GPL(gnttab_grant_foreign_transfer);
void gnttab_grant_foreign_transfer_ref(grant_ref_t ref, domid_t domid,
unsigned long pfn)
{
update_grant_entry(ref, domid, pfn, GTF_accept_transfer);
gnttab_interface->update_entry(ref, domid, pfn, GTF_accept_transfer);
}
EXPORT_SYMBOL_GPL(gnttab_grant_foreign_transfer_ref);
unsigned long gnttab_end_foreign_transfer_ref(grant_ref_t ref)
static unsigned long gnttab_end_foreign_transfer_ref_v1(grant_ref_t ref)
{
unsigned long frame;
u16 flags;
u16 *pflags;
pflags = &gnttab_shared.v1[ref].flags;
/*
* If a transfer is not even yet started, try to reclaim the grant
* reference and return failure (== 0).
*/
while (!((flags = shared[ref].flags) & GTF_transfer_committed)) {
if (sync_cmpxchg(&shared[ref].flags, flags, 0) == flags)
while (!((flags = *pflags) & GTF_transfer_committed)) {
if (sync_cmpxchg(pflags, flags, 0) == flags)
return 0;
cpu_relax();
}
/* If a transfer is in progress then wait until it is completed. */
while (!(flags & GTF_transfer_completed)) {
flags = shared[ref].flags;
flags = *pflags;
cpu_relax();
}
rmb(); /* Read the frame number /after/ reading completion status. */
frame = shared[ref].frame;
frame = gnttab_shared.v1[ref].frame;
BUG_ON(frame == 0);
return frame;
}
static unsigned long gnttab_end_foreign_transfer_ref_v2(grant_ref_t ref)
{
unsigned long frame;
u16 flags;
u16 *pflags;
pflags = &gnttab_shared.v2[ref].hdr.flags;
/*
* If a transfer is not even yet started, try to reclaim the grant
* reference and return failure (== 0).
*/
while (!((flags = *pflags) & GTF_transfer_committed)) {
if (sync_cmpxchg(pflags, flags, 0) == flags)
return 0;
cpu_relax();
}
/* If a transfer is in progress then wait until it is completed. */
while (!(flags & GTF_transfer_completed)) {
flags = *pflags;
cpu_relax();
}
rmb(); /* Read the frame number /after/ reading completion status. */
frame = gnttab_shared.v2[ref].full_page.frame;
BUG_ON(frame == 0);
return frame;
}
unsigned long gnttab_end_foreign_transfer_ref(grant_ref_t ref)
{
return gnttab_interface->end_foreign_transfer_ref(ref);
}
EXPORT_SYMBOL_GPL(gnttab_end_foreign_transfer_ref);
unsigned long gnttab_end_foreign_transfer(grant_ref_t ref)
@ -448,8 +737,8 @@ unsigned int gnttab_max_grant_frames(void)
EXPORT_SYMBOL_GPL(gnttab_max_grant_frames);
int gnttab_map_refs(struct gnttab_map_grant_ref *map_ops,
struct gnttab_map_grant_ref *kmap_ops,
struct page **pages, unsigned int count)
struct gnttab_map_grant_ref *kmap_ops,
struct page **pages, unsigned int count)
{
int i, ret;
pte_t *pte;
@ -472,24 +761,10 @@ int gnttab_map_refs(struct gnttab_map_grant_ref *map_ops,
(map_ops[i].host_addr & ~PAGE_MASK));
mfn = pte_mfn(*pte);
} else {
/* If you really wanted to do this:
* mfn = PFN_DOWN(map_ops[i].dev_bus_addr);
*
* The reason we do not implement it is b/c on the
* unmap path (gnttab_unmap_refs) we have no means of
* checking whether the page is !GNTMAP_contains_pte.
*
* That is without some extra data-structure to carry
* the struct page, bool clear_pte, and list_head next
* tuples and deal with allocation/delallocation, etc.
*
* The users of this API set the GNTMAP_contains_pte
* flag so lets just return not supported until it
* becomes neccessary to implement.
*/
return -EOPNOTSUPP;
mfn = PFN_DOWN(map_ops[i].dev_bus_addr);
}
ret = m2p_add_override(mfn, pages[i], &kmap_ops[i]);
ret = m2p_add_override(mfn, pages[i], kmap_ops ?
&kmap_ops[i] : NULL);
if (ret)
return ret;
}
@ -499,7 +774,7 @@ int gnttab_map_refs(struct gnttab_map_grant_ref *map_ops,
EXPORT_SYMBOL_GPL(gnttab_map_refs);
int gnttab_unmap_refs(struct gnttab_unmap_grant_ref *unmap_ops,
struct page **pages, unsigned int count)
struct page **pages, unsigned int count, bool clear_pte)
{
int i, ret;
@ -511,7 +786,7 @@ int gnttab_unmap_refs(struct gnttab_unmap_grant_ref *unmap_ops,
return ret;
for (i = 0; i < count; i++) {
ret = m2p_remove_override(pages[i], true /* clear the PTE */);
ret = m2p_remove_override(pages[i], clear_pte);
if (ret)
return ret;
}
@ -520,6 +795,77 @@ int gnttab_unmap_refs(struct gnttab_unmap_grant_ref *unmap_ops,
}
EXPORT_SYMBOL_GPL(gnttab_unmap_refs);
static unsigned nr_status_frames(unsigned nr_grant_frames)
{
return (nr_grant_frames * GREFS_PER_GRANT_FRAME + SPP - 1) / SPP;
}
static int gnttab_map_frames_v1(unsigned long *frames, unsigned int nr_gframes)
{
int rc;
rc = arch_gnttab_map_shared(frames, nr_gframes,
gnttab_max_grant_frames(),
&gnttab_shared.addr);
BUG_ON(rc);
return 0;
}
static void gnttab_unmap_frames_v1(void)
{
arch_gnttab_unmap(gnttab_shared.addr, nr_grant_frames);
}
static int gnttab_map_frames_v2(unsigned long *frames, unsigned int nr_gframes)
{
uint64_t *sframes;
unsigned int nr_sframes;
struct gnttab_get_status_frames getframes;
int rc;
nr_sframes = nr_status_frames(nr_gframes);
/* No need for kzalloc as it is initialized in following hypercall
* GNTTABOP_get_status_frames.
*/
sframes = kmalloc(nr_sframes * sizeof(uint64_t), GFP_ATOMIC);
if (!sframes)
return -ENOMEM;
getframes.dom = DOMID_SELF;
getframes.nr_frames = nr_sframes;
set_xen_guest_handle(getframes.frame_list, sframes);
rc = HYPERVISOR_grant_table_op(GNTTABOP_get_status_frames,
&getframes, 1);
if (rc == -ENOSYS) {
kfree(sframes);
return -ENOSYS;
}
BUG_ON(rc || getframes.status);
rc = arch_gnttab_map_status(sframes, nr_sframes,
nr_status_frames(gnttab_max_grant_frames()),
&grstatus);
BUG_ON(rc);
kfree(sframes);
rc = arch_gnttab_map_shared(frames, nr_gframes,
gnttab_max_grant_frames(),
&gnttab_shared.addr);
BUG_ON(rc);
return 0;
}
static void gnttab_unmap_frames_v2(void)
{
arch_gnttab_unmap(gnttab_shared.addr, nr_grant_frames);
arch_gnttab_unmap(grstatus, nr_status_frames(nr_grant_frames));
}
static int gnttab_map(unsigned int start_idx, unsigned int end_idx)
{
struct gnttab_setup_table setup;
@ -551,6 +897,9 @@ static int gnttab_map(unsigned int start_idx, unsigned int end_idx)
return rc;
}
/* No need for kzalloc as it is initialized in following hypercall
* GNTTABOP_setup_table.
*/
frames = kmalloc(nr_gframes * sizeof(unsigned long), GFP_ATOMIC);
if (!frames)
return -ENOMEM;
@ -567,19 +916,65 @@ static int gnttab_map(unsigned int start_idx, unsigned int end_idx)
BUG_ON(rc || setup.status);
rc = arch_gnttab_map_shared(frames, nr_gframes, gnttab_max_grant_frames(),
&shared);
BUG_ON(rc);
rc = gnttab_interface->map_frames(frames, nr_gframes);
kfree(frames);
return 0;
return rc;
}
static struct gnttab_ops gnttab_v1_ops = {
.map_frames = gnttab_map_frames_v1,
.unmap_frames = gnttab_unmap_frames_v1,
.update_entry = gnttab_update_entry_v1,
.end_foreign_access_ref = gnttab_end_foreign_access_ref_v1,
.end_foreign_transfer_ref = gnttab_end_foreign_transfer_ref_v1,
.query_foreign_access = gnttab_query_foreign_access_v1,
};
static struct gnttab_ops gnttab_v2_ops = {
.map_frames = gnttab_map_frames_v2,
.unmap_frames = gnttab_unmap_frames_v2,
.update_entry = gnttab_update_entry_v2,
.end_foreign_access_ref = gnttab_end_foreign_access_ref_v2,
.end_foreign_transfer_ref = gnttab_end_foreign_transfer_ref_v2,
.query_foreign_access = gnttab_query_foreign_access_v2,
.update_subpage_entry = gnttab_update_subpage_entry_v2,
.update_trans_entry = gnttab_update_trans_entry_v2,
};
static void gnttab_request_version(void)
{
int rc;
struct gnttab_set_version gsv;
gsv.version = 2;
rc = HYPERVISOR_grant_table_op(GNTTABOP_set_version, &gsv, 1);
if (rc == 0) {
grant_table_version = 2;
gnttab_interface = &gnttab_v2_ops;
} else if (grant_table_version == 2) {
/*
* If we've already used version 2 features,
* but then suddenly discover that they're not
* available (e.g. migrating to an older
* version of Xen), almost unbounded badness
* can happen.
*/
panic("we need grant tables version 2, but only version 1 is available");
} else {
grant_table_version = 1;
gnttab_interface = &gnttab_v1_ops;
}
printk(KERN_INFO "Grant tables using version %d layout.\n",
grant_table_version);
}
int gnttab_resume(void)
{
unsigned int max_nr_gframes;
gnttab_request_version();
max_nr_gframes = gnttab_max_grant_frames();
if (max_nr_gframes < nr_grant_frames)
return -ENOSYS;
@ -587,9 +982,10 @@ int gnttab_resume(void)
if (xen_pv_domain())
return gnttab_map(0, nr_grant_frames - 1);
if (!shared) {
shared = ioremap(xen_hvm_resume_frames, PAGE_SIZE * max_nr_gframes);
if (shared == NULL) {
if (gnttab_shared.addr == NULL) {
gnttab_shared.addr = ioremap(xen_hvm_resume_frames,
PAGE_SIZE * max_nr_gframes);
if (gnttab_shared.addr == NULL) {
printk(KERN_WARNING
"Failed to ioremap gnttab share frames!");
return -ENOMEM;
@ -603,7 +999,7 @@ int gnttab_resume(void)
int gnttab_suspend(void)
{
arch_gnttab_unmap_shared(shared, nr_grant_frames);
gnttab_interface->unmap_frames();
return 0;
}

41
drivers/xen/xenfs/privcmd.c → drivers/xen/privcmd.c
View file

@ -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
@ -359,7 +365,6 @@ static long privcmd_ioctl(struct file *file,
return ret;
}
#ifndef HAVE_ARCH_PRIVCMD_MMAP
static int privcmd_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
printk(KERN_DEBUG "privcmd_fault: vma=%p %lx-%lx, pgoff=%lx, uv=%p\n",
@ -392,9 +397,39 @@ static int privcmd_enforce_singleshot_mapping(struct vm_area_struct *vma)
{
return (xchg(&vma->vm_private_data, (void *)1) == NULL);
}
#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);

3
drivers/xen/privcmd.h Normal file
View file

@ -0,0 +1,3 @@
#include <linux/fs.h>
extern const struct file_operations xen_privcmd_fops;

4
drivers/xen/xen-pciback/pci_stub.c
View file

@ -99,6 +99,7 @@ static void pcistub_device_release(struct kref *kref)
kfree(pci_get_drvdata(psdev->dev));
pci_set_drvdata(psdev->dev, NULL);
psdev->dev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED;
pci_dev_put(psdev->dev);
kfree(psdev);
@ -234,6 +235,8 @@ void pcistub_put_pci_dev(struct pci_dev *dev)
xen_pcibk_config_free_dyn_fields(found_psdev->dev);
xen_pcibk_config_reset_dev(found_psdev->dev);
xen_unregister_device_domain_owner(found_psdev->dev);
spin_lock_irqsave(&found_psdev->lock, flags);
found_psdev->pdev = NULL;
spin_unlock_irqrestore(&found_psdev->lock, flags);
@ -331,6 +334,7 @@ static int __devinit pcistub_init_device(struct pci_dev *dev)
dev_dbg(&dev->dev, "reset device\n");
xen_pcibk_reset_device(dev);
dev->dev_flags |= PCI_DEV_FLAGS_ASSIGNED;
return 0;
config_release:

19
drivers/xen/xen-pciback/xenbus.c
View file

@ -241,11 +241,10 @@ static int xen_pcibk_export_device(struct xen_pcibk_device *pdev,
goto out;
dev_dbg(&dev->dev, "registering for %d\n", pdev->xdev->otherend_id);
dev->dev_flags |= PCI_DEV_FLAGS_ASSIGNED;
if (xen_register_device_domain_owner(dev,
pdev->xdev->otherend_id) != 0) {
dev_err(&dev->dev, "device has been assigned to another " \
"domain! Over-writting the ownership, but beware.\n");
dev_err(&dev->dev, "Stealing ownership from dom%d.\n",
xen_find_device_domain_owner(dev));
xen_unregister_device_domain_owner(dev);
xen_register_device_domain_owner(dev, pdev->xdev->otherend_id);
}
@ -281,7 +280,6 @@ static int xen_pcibk_remove_device(struct xen_pcibk_device *pdev,
}
dev_dbg(&dev->dev, "unregistering for %d\n", pdev->xdev->otherend_id);
dev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED;
xen_unregister_device_domain_owner(dev);
xen_pcibk_release_pci_dev(pdev, dev);
@ -707,19 +705,16 @@ static int xen_pcibk_xenbus_remove(struct xenbus_device *dev)
return 0;
}
static const struct xenbus_device_id xenpci_ids[] = {
static const struct xenbus_device_id xen_pcibk_ids[] = {
{"pci"},
{""},
};
static struct xenbus_driver xenbus_xen_pcibk_driver = {
.name = DRV_NAME,
.owner = THIS_MODULE,
.ids = xenpci_ids,
static DEFINE_XENBUS_DRIVER(xen_pcibk, DRV_NAME,
.probe = xen_pcibk_xenbus_probe,
.remove = xen_pcibk_xenbus_remove,
.otherend_changed = xen_pcibk_frontend_changed,
};
);
const struct xen_pcibk_backend *__read_mostly xen_pcibk_backend;
@ -735,11 +730,11 @@ int __init xen_pcibk_xenbus_register(void)
if (passthrough)
xen_pcibk_backend = &xen_pcibk_passthrough_backend;
pr_info(DRV_NAME ": backend is %s\n", xen_pcibk_backend->name);
return xenbus_register_backend(&xenbus_xen_pcibk_driver);
return xenbus_register_backend(&xen_pcibk_driver);
}
void __exit xen_pcibk_xenbus_unregister(void)
{
destroy_workqueue(xen_pcibk_wq);
xenbus_unregister_driver(&xenbus_xen_pcibk_driver);
xenbus_unregister_driver(&xen_pcibk_driver);
}

2
drivers/xen/xenbus/Makefile
View file

@ -1,4 +1,5 @@
obj-y += xenbus.o
obj-y += xenbus_dev_frontend.o
xenbus-objs =
xenbus-objs += xenbus_client.o
@ -9,4 +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

195
drivers/xen/xenbus/xenbus_client.c
View file

@ -32,15 +32,39 @@
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/spinlock.h>
#include <linux/vmalloc.h>
#include <linux/export.h>
#include <asm/xen/hypervisor.h>
#include <asm/xen/page.h>
#include <xen/interface/xen.h>
#include <xen/interface/event_channel.h>
#include <xen/balloon.h>
#include <xen/events.h>
#include <xen/grant_table.h>
#include <xen/xenbus.h>
#include <xen/xen.h>
#include "xenbus_probe.h"
struct xenbus_map_node {
struct list_head next;
union {
struct vm_struct *area; /* PV */
struct page *page; /* HVM */
};
grant_handle_t handle;
};
static DEFINE_SPINLOCK(xenbus_valloc_lock);
static LIST_HEAD(xenbus_valloc_pages);
struct xenbus_ring_ops {
int (*map)(struct xenbus_device *dev, int gnt, void **vaddr);
int (*unmap)(struct xenbus_device *dev, void *vaddr);
};
static const struct xenbus_ring_ops *ring_ops __read_mostly;
const char *xenbus_strstate(enum xenbus_state state)
{
@ -435,21 +459,35 @@ EXPORT_SYMBOL_GPL(xenbus_free_evtchn);
* XenbusStateClosing and the error message will be saved in XenStore.
*/
int xenbus_map_ring_valloc(struct xenbus_device *dev, int gnt_ref, void **vaddr)
{
return ring_ops->map(dev, gnt_ref, vaddr);
}
EXPORT_SYMBOL_GPL(xenbus_map_ring_valloc);
static int xenbus_map_ring_valloc_pv(struct xenbus_device *dev,
int gnt_ref, void **vaddr)
{
struct gnttab_map_grant_ref op = {
.flags = GNTMAP_host_map | GNTMAP_contains_pte,
.ref = gnt_ref,
.dom = dev->otherend_id,
};
struct xenbus_map_node *node;
struct vm_struct *area;
pte_t *pte;
*vaddr = NULL;
area = alloc_vm_area(PAGE_SIZE, &pte);
if (!area)
node = kzalloc(sizeof(*node), GFP_KERNEL);
if (!node)
return -ENOMEM;
area = alloc_vm_area(PAGE_SIZE, &pte);
if (!area) {
kfree(node);
return -ENOMEM;
}
op.host_addr = arbitrary_virt_to_machine(pte).maddr;
if (HYPERVISOR_grant_table_op(GNTTABOP_map_grant_ref, &op, 1))
@ -457,19 +495,59 @@ int xenbus_map_ring_valloc(struct xenbus_device *dev, int gnt_ref, void **vaddr)
if (op.status != GNTST_okay) {
free_vm_area(area);
kfree(node);
xenbus_dev_fatal(dev, op.status,
"mapping in shared page %d from domain %d",
gnt_ref, dev->otherend_id);
return op.status;
}
/* Stuff the handle in an unused field */
area->phys_addr = (unsigned long)op.handle;
node->handle = op.handle;
node->area = area;
spin_lock(&xenbus_valloc_lock);
list_add(&node->next, &xenbus_valloc_pages);
spin_unlock(&xenbus_valloc_lock);
*vaddr = area->addr;
return 0;
}
EXPORT_SYMBOL_GPL(xenbus_map_ring_valloc);
static int xenbus_map_ring_valloc_hvm(struct xenbus_device *dev,
int gnt_ref, void **vaddr)
{
struct xenbus_map_node *node;
int err;
void *addr;
*vaddr = NULL;
node = kzalloc(sizeof(*node), GFP_KERNEL);
if (!node)
return -ENOMEM;
err = alloc_xenballooned_pages(1, &node->page, false /* lowmem */);
if (err)
goto out_err;
addr = pfn_to_kaddr(page_to_pfn(node->page));
err = xenbus_map_ring(dev, gnt_ref, &node->handle, addr);
if (err)
goto out_err;
spin_lock(&xenbus_valloc_lock);
list_add(&node->next, &xenbus_valloc_pages);
spin_unlock(&xenbus_valloc_lock);
*vaddr = addr;
return 0;
out_err:
free_xenballooned_pages(1, &node->page);
kfree(node);
return err;
}
/**
@ -489,12 +567,10 @@ EXPORT_SYMBOL_GPL(xenbus_map_ring_valloc);
int xenbus_map_ring(struct xenbus_device *dev, int gnt_ref,
grant_handle_t *handle, void *vaddr)
{
struct gnttab_map_grant_ref op = {
.host_addr = (unsigned long)vaddr,
.flags = GNTMAP_host_map,
.ref = gnt_ref,
.dom = dev->otherend_id,
};
struct gnttab_map_grant_ref op;
gnttab_set_map_op(&op, (phys_addr_t)vaddr, GNTMAP_host_map, gnt_ref,
dev->otherend_id);
if (HYPERVISOR_grant_table_op(GNTTABOP_map_grant_ref, &op, 1))
BUG();
@ -525,32 +601,36 @@ EXPORT_SYMBOL_GPL(xenbus_map_ring);
*/
int xenbus_unmap_ring_vfree(struct xenbus_device *dev, void *vaddr)
{
struct vm_struct *area;
return ring_ops->unmap(dev, vaddr);
}
EXPORT_SYMBOL_GPL(xenbus_unmap_ring_vfree);
static int xenbus_unmap_ring_vfree_pv(struct xenbus_device *dev, void *vaddr)
{
struct xenbus_map_node *node;
struct gnttab_unmap_grant_ref op = {
.host_addr = (unsigned long)vaddr,
};
unsigned int level;
/* It'd be nice if linux/vmalloc.h provided a find_vm_area(void *addr)
* method so that we don't have to muck with vmalloc internals here.
* We could force the user to hang on to their struct vm_struct from
* xenbus_map_ring_valloc, but these 6 lines considerably simplify
* this API.
*/
read_lock(&vmlist_lock);
for (area = vmlist; area != NULL; area = area->next) {
if (area->addr == vaddr)
break;
spin_lock(&xenbus_valloc_lock);
list_for_each_entry(node, &xenbus_valloc_pages, next) {
if (node->area->addr == vaddr) {
list_del(&node->next);
goto found;
}
}
read_unlock(&vmlist_lock);
node = NULL;
found:
spin_unlock(&xenbus_valloc_lock);
if (!area) {
if (!node) {
xenbus_dev_error(dev, -ENOENT,
"can't find mapped virtual address %p", vaddr);
return GNTST_bad_virt_addr;
}
op.handle = (grant_handle_t)area->phys_addr;
op.handle = node->handle;
op.host_addr = arbitrary_virt_to_machine(
lookup_address((unsigned long)vaddr, &level)).maddr;
@ -558,16 +638,50 @@ int xenbus_unmap_ring_vfree(struct xenbus_device *dev, void *vaddr)
BUG();
if (op.status == GNTST_okay)
free_vm_area(area);
free_vm_area(node->area);
else
xenbus_dev_error(dev, op.status,
"unmapping page at handle %d error %d",
(int16_t)area->phys_addr, op.status);
node->handle, op.status);
kfree(node);
return op.status;
}
EXPORT_SYMBOL_GPL(xenbus_unmap_ring_vfree);
static int xenbus_unmap_ring_vfree_hvm(struct xenbus_device *dev, void *vaddr)
{
int rv;
struct xenbus_map_node *node;
void *addr;
spin_lock(&xenbus_valloc_lock);
list_for_each_entry(node, &xenbus_valloc_pages, next) {
addr = pfn_to_kaddr(page_to_pfn(node->page));
if (addr == vaddr) {
list_del(&node->next);
goto found;
}
}
node = NULL;
found:
spin_unlock(&xenbus_valloc_lock);
if (!node) {
xenbus_dev_error(dev, -ENOENT,
"can't find mapped virtual address %p", vaddr);
return GNTST_bad_virt_addr;
}
rv = xenbus_unmap_ring(dev, node->handle, addr);
if (!rv)
free_xenballooned_pages(1, &node->page);
else
WARN(1, "Leaking %p\n", vaddr);
kfree(node);
return rv;
}
/**
* xenbus_unmap_ring
@ -582,10 +696,9 @@ EXPORT_SYMBOL_GPL(xenbus_unmap_ring_vfree);
int xenbus_unmap_ring(struct xenbus_device *dev,
grant_handle_t handle, void *vaddr)
{
struct gnttab_unmap_grant_ref op = {
.host_addr = (unsigned long)vaddr,
.handle = handle,
};
struct gnttab_unmap_grant_ref op;
gnttab_set_unmap_op(&op, (phys_addr_t)vaddr, GNTMAP_host_map, handle);
if (HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref, &op, 1))
BUG();
@ -617,3 +730,21 @@ enum xenbus_state xenbus_read_driver_state(const char *path)
return result;
}
EXPORT_SYMBOL_GPL(xenbus_read_driver_state);
static const struct xenbus_ring_ops ring_ops_pv = {
.map = xenbus_map_ring_valloc_pv,
.unmap = xenbus_unmap_ring_vfree_pv,
};
static const struct xenbus_ring_ops ring_ops_hvm = {
.map = xenbus_map_ring_valloc_hvm,
.unmap = xenbus_unmap_ring_vfree_hvm,
};
void __init xenbus_ring_ops_init(void)
{
if (xen_pv_domain())
ring_ops = &ring_ops_pv;
else
ring_ops = &ring_ops_hvm;
}

4
drivers/xen/xenbus/xenbus_comms.h
View file

@ -31,6 +31,8 @@
#ifndef _XENBUS_COMMS_H
#define _XENBUS_COMMS_H
#include <linux/fs.h>
int xs_init(void);
int xb_init_comms(void);
@ -43,4 +45,6 @@ int xs_input_avail(void);
extern struct xenstore_domain_interface *xen_store_interface;
extern int xen_store_evtchn;
extern const struct file_operations xen_xenbus_fops;
#endif /* _XENBUS_COMMS_H */

90
drivers/xen/xenbus/xenbus_dev_backend.c Normal file
View file

@ -0,0 +1,90 @@
#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/xen.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);

40
drivers/xen/xenfs/xenbus.c → drivers/xen/xenbus/xenbus_dev_frontend.c
View file

@ -52,13 +52,17 @@
#include <linux/namei.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/miscdevice.h>
#include <linux/module.h>
#include "xenfs.h"
#include "../xenbus/xenbus_comms.h"
#include "xenbus_comms.h"
#include <xen/xenbus.h>
#include <xen/xen.h>
#include <asm/xen/hypervisor.h>
MODULE_LICENSE("GPL");
/*
* An element of a list of outstanding transactions, for which we're
* still waiting a reply.
@ -101,7 +105,7 @@ struct xenbus_file_priv {
unsigned int len;
union {
struct xsd_sockmsg msg;
char buffer[PAGE_SIZE];
char buffer[XENSTORE_PAYLOAD_MAX];
} u;
/* Response queue. */
@ -583,7 +587,7 @@ static unsigned int xenbus_file_poll(struct file *file, poll_table *wait)
return 0;
}
const struct file_operations xenbus_file_ops = {
const struct file_operations xen_xenbus_fops = {
.read = xenbus_file_read,
.write = xenbus_file_write,
.open = xenbus_file_open,
@ -591,3 +595,31 @@ const struct file_operations xenbus_file_ops = {
.poll = xenbus_file_poll,
.llseek = no_llseek,
};
EXPORT_SYMBOL_GPL(xen_xenbus_fops);
static struct miscdevice xenbus_dev = {
.minor = MISC_DYNAMIC_MINOR,
.name = "xen/xenbus",
.fops = &xen_xenbus_fops,
};
static int __init xenbus_init(void)
{
int err;
if (!xen_domain())
return -ENODEV;
err = misc_register(&xenbus_dev);
if (err)
printk(KERN_ERR "Could not register xenbus frontend device\n");
return err;
}
static void __exit xenbus_exit(void)
{
misc_deregister(&xenbus_dev);
}
module_init(xenbus_init);
module_exit(xenbus_exit);

9
drivers/xen/xenbus/xenbus_probe.c
View file

@ -291,14 +291,9 @@ void xenbus_dev_shutdown(struct device *_dev)
EXPORT_SYMBOL_GPL(xenbus_dev_shutdown);
int xenbus_register_driver_common(struct xenbus_driver *drv,
struct xen_bus_type *bus,
struct module *owner,
const char *mod_name)
struct xen_bus_type *bus)
{
drv->driver.name = drv->name;
drv->driver.bus = &bus->bus;
drv->driver.owner = owner;
drv->driver.mod_name = mod_name;
return driver_register(&drv->driver);
}
@ -730,6 +725,8 @@ static int __init xenbus_init(void)
if (!xen_domain())
return -ENODEV;
xenbus_ring_ops_init();
if (xen_hvm_domain()) {
uint64_t v = 0;
err = hvm_get_parameter(HVM_PARAM_STORE_EVTCHN, &v);

6
drivers/xen/xenbus/xenbus_probe.h
View file

@ -53,9 +53,7 @@ extern int xenbus_match(struct device *_dev, struct device_driver *_drv);
extern int xenbus_dev_probe(struct device *_dev);
extern int xenbus_dev_remove(struct device *_dev);
extern int xenbus_register_driver_common(struct xenbus_driver *drv,
struct xen_bus_type *bus,
struct module *owner,
const char *mod_name);
struct xen_bus_type *bus);
extern int xenbus_probe_node(struct xen_bus_type *bus,
const char *type,
const char *nodename);
@ -76,4 +74,6 @@ extern void xenbus_otherend_changed(struct xenbus_watch *watch,
extern int xenbus_read_otherend_details(struct xenbus_device *xendev,
char *id_node, char *path_node);
void xenbus_ring_ops_init(void);
#endif

8
drivers/xen/xenbus/xenbus_probe_backend.c
View file

@ -232,15 +232,13 @@ int xenbus_dev_is_online(struct xenbus_device *dev)
}
EXPORT_SYMBOL_GPL(xenbus_dev_is_online);
int __xenbus_register_backend(struct xenbus_driver *drv,
struct module *owner, const char *mod_name)
int xenbus_register_backend(struct xenbus_driver *drv)
{
drv->read_otherend_details = read_frontend_details;
return xenbus_register_driver_common(drv, &xenbus_backend,
owner, mod_name);
return xenbus_register_driver_common(drv, &xenbus_backend);
}
EXPORT_SYMBOL_GPL(__xenbus_register_backend);
EXPORT_SYMBOL_GPL(xenbus_register_backend);
static int backend_probe_and_watch(struct notifier_block *notifier,
unsigned long event,

8
drivers/xen/xenbus/xenbus_probe_frontend.c
View file

@ -230,15 +230,13 @@ static void wait_for_devices(struct xenbus_driver *xendrv)
print_device_status);
}
int __xenbus_register_frontend(struct xenbus_driver *drv,
struct module *owner, const char *mod_name)
int xenbus_register_frontend(struct xenbus_driver *drv)
{
int ret;
drv->read_otherend_details = read_backend_details;
ret = xenbus_register_driver_common(drv, &xenbus_frontend,
owner, mod_name);
ret = xenbus_register_driver_common(drv, &xenbus_frontend);
if (ret)
return ret;
@ -247,7 +245,7 @@ int __xenbus_register_frontend(struct xenbus_driver *drv,
return 0;
}
EXPORT_SYMBOL_GPL(__xenbus_register_frontend);
EXPORT_SYMBOL_GPL(xenbus_register_frontend);
static DECLARE_WAIT_QUEUE_HEAD(backend_state_wq);
static int backend_state;

23
drivers/xen/xenbus/xenbus_xs.c
View file

@ -532,21 +532,18 @@ int xenbus_printf(struct xenbus_transaction t,
{
va_list ap;
int ret;
#define PRINTF_BUFFER_SIZE 4096
char *printf_buffer;
printf_buffer = kmalloc(PRINTF_BUFFER_SIZE, GFP_NOIO | __GFP_HIGH);
if (printf_buffer == NULL)
return -ENOMEM;
char *buf;
va_start(ap, fmt);
ret = vsnprintf(printf_buffer, PRINTF_BUFFER_SIZE, fmt, ap);
buf = kvasprintf(GFP_NOIO | __GFP_HIGH, fmt, ap);
va_end(ap);
BUG_ON(ret > PRINTF_BUFFER_SIZE-1);
ret = xenbus_write(t, dir, node, printf_buffer);
if (!buf)
return -ENOMEM;
kfree(printf_buffer);
ret = xenbus_write(t, dir, node, buf);
kfree(buf);
return ret;
}
@ -801,6 +798,12 @@ static int process_msg(void)
goto out;
}
if (msg->hdr.len > XENSTORE_PAYLOAD_MAX) {
kfree(msg);
err = -EINVAL;
goto out;
}
body = kmalloc(msg->hdr.len + 1, GFP_NOIO | __GFP_HIGH);
if (body == NULL) {
kfree(msg);

2
drivers/xen/xenfs/Makefile
View file

@ -1,4 +1,4 @@
obj-$(CONFIG_XENFS) += xenfs.o
xenfs-y = super.o xenbus.o privcmd.o
xenfs-y = super.o
xenfs-$(CONFIG_XEN_DOM0) += xenstored.o

6
drivers/xen/xenfs/super.c
View file

@ -16,6 +16,8 @@
#include <xen/xen.h>
#include "xenfs.h"
#include "../privcmd.h"
#include "../xenbus/xenbus_comms.h"
#include <asm/xen/hypervisor.h>
@ -82,9 +84,9 @@ static int xenfs_fill_super(struct super_block *sb, void *data, int silent)
{
static struct tree_descr xenfs_files[] = {
[1] = {},
{ "xenbus", &xenbus_file_ops, S_IRUSR|S_IWUSR },
{ "xenbus", &xen_xenbus_fops, 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;

2
drivers/xen/xenfs/xenfs.h
View file

@ -1,8 +1,6 @@
#ifndef _XENFS_XENBUS_H
#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;

7
include/xen/events.h
View file

@ -37,6 +37,13 @@ int bind_interdomain_evtchn_to_irqhandler(unsigned int remote_domain,
*/
void unbind_from_irqhandler(unsigned int irq, void *dev_id);
/*
* Allow extra references to event channels exposed to userspace by evtchn
*/
int evtchn_make_refcounted(unsigned int evtchn);
int evtchn_get(unsigned int evtchn);
void evtchn_put(unsigned int evtchn);
void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector);
int resend_irq_on_evtchn(unsigned int irq);
void rebind_evtchn_irq(int evtchn, int irq);

37
include/xen/grant_table.h
View file

@ -62,6 +62,24 @@ int gnttab_resume(void);
int gnttab_grant_foreign_access(domid_t domid, unsigned long frame,
int readonly);
int gnttab_grant_foreign_access_subpage(domid_t domid, unsigned long frame,
int flags, unsigned page_off,
unsigned length);
int gnttab_grant_foreign_access_trans(domid_t domid, int flags,
domid_t trans_domid,
grant_ref_t trans_gref);
/*
* Are sub-page grants available on this version of Xen? Returns true if they
* are, and false if they're not.
*/
bool gnttab_subpage_grants_available(void);
/*
* Are transitive grants available on this version of Xen? Returns true if they
* are, and false if they're not.
*/
bool gnttab_trans_grants_available(void);
/*
* End access through the given grant reference, iff the grant entry is no
@ -108,6 +126,13 @@ void gnttab_cancel_free_callback(struct gnttab_free_callback *callback);
void gnttab_grant_foreign_access_ref(grant_ref_t ref, domid_t domid,
unsigned long frame, int readonly);
int gnttab_grant_foreign_access_subpage_ref(grant_ref_t ref, domid_t domid,
unsigned long frame, int flags,
unsigned page_off,
unsigned length);
int gnttab_grant_foreign_access_trans_ref(grant_ref_t ref, domid_t domid,
int flags, domid_t trans_domid,
grant_ref_t trans_gref);
void gnttab_grant_foreign_transfer_ref(grant_ref_t, domid_t domid,
unsigned long pfn);
@ -145,9 +170,11 @@ gnttab_set_unmap_op(struct gnttab_unmap_grant_ref *unmap, phys_addr_t addr,
int arch_gnttab_map_shared(unsigned long *frames, unsigned long nr_gframes,
unsigned long max_nr_gframes,
struct grant_entry **__shared);
void arch_gnttab_unmap_shared(struct grant_entry *shared,
unsigned long nr_gframes);
void **__shared);
int arch_gnttab_map_status(uint64_t *frames, unsigned long nr_gframes,
unsigned long max_nr_gframes,
grant_status_t **__shared);
void arch_gnttab_unmap(void *shared, unsigned long nr_gframes);
extern unsigned long xen_hvm_resume_frames;
unsigned int gnttab_max_grant_frames(void);
@ -155,9 +182,9 @@ unsigned int gnttab_max_grant_frames(void);
#define gnttab_map_vaddr(map) ((void *)(map.host_virt_addr))
int gnttab_map_refs(struct gnttab_map_grant_ref *map_ops,
struct gnttab_map_grant_ref *kmap_ops,
struct gnttab_map_grant_ref *kmap_ops,
struct page **pages, unsigned int count);
int gnttab_unmap_refs(struct gnttab_unmap_grant_ref *unmap_ops,
struct page **pages, unsigned int count);
struct page **pages, unsigned int count, bool clear_pte);
#endif /* __ASM_GNTTAB_H__ */

169
include/xen/interface/grant_table.h
View file

@ -84,13 +84,23 @@
* Use SMP-safe bit-setting instruction.
*/
/*
* Reference to a grant entry in a specified domain's grant table.
*/
typedef uint32_t grant_ref_t;
/*
* A grant table comprises a packed array of grant entries in one or more
* page frames shared between Xen and a guest.
* [XEN]: This field is written by Xen and read by the sharing guest.
* [GST]: This field is written by the guest and read by Xen.
*/
struct grant_entry {
/*
* Version 1 of the grant table entry structure is maintained purely
* for backwards compatibility. New guests should use version 2.
*/
struct grant_entry_v1 {
/* GTF_xxx: various type and flag information. [XEN,GST] */
uint16_t flags;
/* The domain being granted foreign privileges. [GST] */
@ -108,10 +118,13 @@ struct grant_entry {
* GTF_permit_access: Allow @domid to map/access @frame.
* GTF_accept_transfer: Allow @domid to transfer ownership of one page frame
* to this guest. Xen writes the page number to @frame.
* GTF_transitive: Allow @domid to transitively access a subrange of
* @trans_grant in @trans_domid. No mappings are allowed.
*/
#define GTF_invalid (0U<<0)
#define GTF_permit_access (1U<<0)
#define GTF_accept_transfer (2U<<0)
#define GTF_transitive (3U<<0)
#define GTF_type_mask (3U<<0)
/*
@ -119,6 +132,9 @@ struct grant_entry {
* GTF_readonly: Restrict @domid to read-only mappings and accesses. [GST]
* GTF_reading: Grant entry is currently mapped for reading by @domid. [XEN]
* GTF_writing: Grant entry is currently mapped for writing by @domid. [XEN]
* GTF_sub_page: Grant access to only a subrange of the page. @domid
* will only be allowed to copy from the grant, and not
* map it. [GST]
*/
#define _GTF_readonly (2)
#define GTF_readonly (1U<<_GTF_readonly)
@ -126,6 +142,8 @@ struct grant_entry {
#define GTF_reading (1U<<_GTF_reading)
#define _GTF_writing (4)
#define GTF_writing (1U<<_GTF_writing)
#define _GTF_sub_page (8)
#define GTF_sub_page (1U<<_GTF_sub_page)
/*
* Subflags for GTF_accept_transfer:
@ -142,16 +160,82 @@ struct grant_entry {
#define _GTF_transfer_completed (3)
#define GTF_transfer_completed (1U<<_GTF_transfer_completed)
/*
* Version 2 grant table entries. These fulfil the same role as
* version 1 entries, but can represent more complicated operations.
* Any given domain will have either a version 1 or a version 2 table,
* and every entry in the table will be the same version.
*
* The interface by which domains use grant references does not depend
* on the grant table version in use by the other domain.
*/
/*
* Version 1 and version 2 grant entries share a common prefix. The
* fields of the prefix are documented as part of struct
* grant_entry_v1.
*/
struct grant_entry_header {
uint16_t flags;
domid_t domid;
};
/*
* Version 2 of the grant entry structure, here is an union because three
* different types are suppotted: full_page, sub_page and transitive.
*/
union grant_entry_v2 {
struct grant_entry_header hdr;
/*
* This member is used for V1-style full page grants, where either:
*
* -- hdr.type is GTF_accept_transfer, or
* -- hdr.type is GTF_permit_access and GTF_sub_page is not set.
*
* In that case, the frame field has the same semantics as the
* field of the same name in the V1 entry structure.
*/
struct {
struct grant_entry_header hdr;
uint32_t pad0;
uint64_t frame;
} full_page;
/*
* If the grant type is GTF_grant_access and GTF_sub_page is set,
* @domid is allowed to access bytes [@page_off,@page_off+@length)
* in frame @frame.
*/
struct {
struct grant_entry_header hdr;
uint16_t page_off;
uint16_t length;
uint64_t frame;
} sub_page;
/*
* If the grant is GTF_transitive, @domid is allowed to use the
* grant @gref in domain @trans_domid, as if it was the local
* domain. Obviously, the transitive access must be compatible
* with the original grant.
*/
struct {
struct grant_entry_header hdr;
domid_t trans_domid;
uint16_t pad0;
grant_ref_t gref;
} transitive;
uint32_t __spacer[4]; /* Pad to a power of two */
};
typedef uint16_t grant_status_t;
/***********************************
* GRANT TABLE QUERIES AND USES
*/
/*
* Reference to a grant entry in a specified domain's grant table.
*/
typedef uint32_t grant_ref_t;
/*
* Handle to track a mapping created via a grant reference.
*/
@ -321,6 +405,79 @@ struct gnttab_query_size {
};
DEFINE_GUEST_HANDLE_STRUCT(gnttab_query_size);
/*
* GNTTABOP_unmap_and_replace: Destroy one or more grant-reference mappings
* tracked by <handle> but atomically replace the page table entry with one
* pointing to the machine address under <new_addr>. <new_addr> will be
* redirected to the null entry.
* NOTES:
* 1. The call may fail in an undefined manner if either mapping is not
* tracked by <handle>.
* 2. After executing a batch of unmaps, it is guaranteed that no stale
* mappings will remain in the device or host TLBs.
*/
#define GNTTABOP_unmap_and_replace 7
struct gnttab_unmap_and_replace {
/* IN parameters. */
uint64_t host_addr;
uint64_t new_addr;
grant_handle_t handle;
/* OUT parameters. */
int16_t status; /* GNTST_* */
};
DEFINE_GUEST_HANDLE_STRUCT(gnttab_unmap_and_replace);
/*
* GNTTABOP_set_version: Request a particular version of the grant
* table shared table structure. This operation can only be performed
* once in any given domain. It must be performed before any grants
* are activated; otherwise, the domain will be stuck with version 1.
* The only defined versions are 1 and 2.
*/
#define GNTTABOP_set_version 8
struct gnttab_set_version {
/* IN parameters */
uint32_t version;
};
DEFINE_GUEST_HANDLE_STRUCT(gnttab_set_version);
/*
* GNTTABOP_get_status_frames: Get the list of frames used to store grant
* status for <dom>. In grant format version 2, the status is separated
* from the other shared grant fields to allow more efficient synchronization
* using barriers instead of atomic cmpexch operations.
* <nr_frames> specify the size of vector <frame_list>.
* The frame addresses are returned in the <frame_list>.
* Only <nr_frames> addresses are returned, even if the table is larger.
* NOTES:
* 1. <dom> may be specified as DOMID_SELF.
* 2. Only a sufficiently-privileged domain may specify <dom> != DOMID_SELF.
*/
#define GNTTABOP_get_status_frames 9
struct gnttab_get_status_frames {
/* IN parameters. */
uint32_t nr_frames;
domid_t dom;
/* OUT parameters. */
int16_t status; /* GNTST_* */
GUEST_HANDLE(uint64_t) frame_list;
};
DEFINE_GUEST_HANDLE_STRUCT(gnttab_get_status_frames);
/*
* GNTTABOP_get_version: Get the grant table version which is in
* effect for domain <dom>.
*/
#define GNTTABOP_get_version 10
struct gnttab_get_version {
/* IN parameters */
domid_t dom;
uint16_t pad;
/* OUT parameters */
uint32_t version;
};
DEFINE_GUEST_HANDLE_STRUCT(gnttab_get_version);
/*
* Bitfield values for update_pin_status.flags.
*/

3
include/xen/interface/io/xs_wire.h
View file

@ -87,4 +87,7 @@ struct xenstore_domain_interface {
XENSTORE_RING_IDX rsp_cons, rsp_prod;
};
/* Violating this is very bad. See docs/misc/xenstore.txt. */
#define XENSTORE_PAYLOAD_MAX 4096
#endif /* _XS_WIRE_H */

2
include/xen/interface/xen.h
View file

@ -523,6 +523,8 @@ struct tmem_op {
} u;
};
DEFINE_GUEST_HANDLE(u64);
#else /* __ASSEMBLY__ */
/* In assembly code we cannot use C numeric constant suffixes. */

31
include/xen/xenbus.h
View file

@ -85,8 +85,6 @@ struct xenbus_device_id
/* A xenbus driver. */
struct xenbus_driver {
char *name;
struct module *owner;
const struct xenbus_device_id *ids;
int (*probe)(struct xenbus_device *dev,
const struct xenbus_device_id *id);
@ -101,31 +99,20 @@ struct xenbus_driver {
int (*is_ready)(struct xenbus_device *dev);
};
#define DEFINE_XENBUS_DRIVER(var, drvname, methods...) \
struct xenbus_driver var ## _driver = { \
.driver.name = drvname + 0 ?: var ## _ids->devicetype, \
.driver.owner = THIS_MODULE, \
.ids = var ## _ids, ## methods \
}
static inline struct xenbus_driver *to_xenbus_driver(struct device_driver *drv)
{
return container_of(drv, struct xenbus_driver, driver);
}
int __must_check __xenbus_register_frontend(struct xenbus_driver *drv,
struct module *owner,
const char *mod_name);
static inline int __must_check
xenbus_register_frontend(struct xenbus_driver *drv)
{
WARN_ON(drv->owner != THIS_MODULE);
return __xenbus_register_frontend(drv, THIS_MODULE, KBUILD_MODNAME);
}
int __must_check __xenbus_register_backend(struct xenbus_driver *drv,
struct module *owner,
const char *mod_name);
static inline int __must_check
xenbus_register_backend(struct xenbus_driver *drv)
{
WARN_ON(drv->owner != THIS_MODULE);
return __xenbus_register_backend(drv, THIS_MODULE, KBUILD_MODNAME);
}
int __must_check xenbus_register_frontend(struct xenbus_driver *);
int __must_check xenbus_register_backend(struct xenbus_driver *);
void xenbus_unregister_driver(struct xenbus_driver *drv);

41
include/xen/xenbus_dev.h Normal file
View file

@ -0,0 +1,41 @@
/******************************************************************************
* evtchn.h
*
* Interface to /dev/xen/xenbus_backend.
*
* Copyright (c) 2011 Bastian Blank <waldi@debian.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation; or, when distributed
* separately from the Linux kernel or incorporated into other
* software packages, subject to the following license:
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this source file (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy, modify,
* merge, publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#ifndef __LINUX_XEN_XENBUS_DEV_H__
#define __LINUX_XEN_XENBUS_DEV_H__
#include <linux/ioctl.h>
#define IOCTL_XENBUS_BACKEND_EVTCHN \
_IOC(_IOC_NONE, 'B', 0, 0)
#endif /* __LINUX_XEN_XENBUS_DEV_H__ */