| Age | Commit message (Collapse) | Author |
|---|
|
What it is: vhost net is a character device that can be used to reduce
the number of system calls involved in virtio networking.
Existing virtio net code is used in the guest without modification.
There's similarity with vringfd, with some differences and reduced scope
- uses eventfd for signalling
- structures can be moved around in memory at any time (good for
migration, bug work-arounds in userspace)
- write logging is supported (good for migration)
- support memory table and not just an offset (needed for kvm)
common virtio related code has been put in a separate file vhost.c and
can be made into a separate module if/when more backends appear. I used
Rusty's lguest.c as the source for developing this part : this supplied
me with witty comments I wouldn't be able to write myself.
What it is not: vhost net is not a bus, and not a generic new system
call. No assumptions are made on how guest performs hypercalls.
Userspace hypervisors are supported as well as kvm.
How it works: Basically, we connect virtio frontend (configured by
userspace) to a backend. The backend could be a network device, or a tap
device. Backend is also configured by userspace, including vlan/mac
etc.
Status: This works for me, and I haven't see any crashes.
Compared to userspace, people reported improved latency (as I save up to
4 system calls per packet), as well as better bandwidth and CPU
utilization.
Features that I plan to look at in the future:
- mergeable buffers
- zero copy
- scalability tuning: figure out the best threading model to use
Note on RCU usage (this is also documented in vhost.h, near
private_pointer which is the value protected by this variant of RCU):
what is happening is that the rcu_dereference() is being used in a
workqueue item. The role of rcu_read_lock() is taken on by the start of
execution of the workqueue item, of rcu_read_unlock() by the end of
execution of the workqueue item, and of synchronize_rcu() by
flush_workqueue()/flush_work(). In the future we might need to apply
some gcc attribute or sparse annotation to the function passed to
INIT_WORK(). Paul's ack below is for this RCU usage.
(Includes fixes by Alan Cox <alan@linux.intel.com>,
David L Stevens <dlstevens@us.ibm.com>,
Chris Wright <chrisw@redhat.com>)
Acked-by: Rusty Russell <rusty@rustcorp.com.au>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
|
|
This allows subsytems to provide devtmpfs with non-default permissions
for the device node. Instead of the default mode of 0600, null, zero,
random, urandom, full, tty, ptmx now have a mode of 0666, which allows
non-privileged processes to access standard device nodes in case no
other userspace process applies the expected permissions.
This also fixes a wrong assignment in pktcdvd and a checkpatch.pl complain.
Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
|
|
This adds support for misc devices to report their requested nodename to
userspace. It also updates a number of misc drivers to provide the
needed subdirectory and device name to be used for them.
Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Jan Blunck <jblunck@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
|
|
Signed-off-by: Eric Moore <eric.moore@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
|
|
Move FUSE_MINOR to miscdevice.h. While at it, de-uglify the file.
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
|
|
After 2.6.24 there was a plan to make the PM core acquire all device
semaphores during a suspend/hibernation to protect itself from
concurrent operations involving device objects. That proved to be
too heavy-handed and we found a better way to achieve the goal, but
before it happened, we had introduced the functions
device_pm_schedule_removal() and destroy_suspended_device() to allow
drivers to "safely" destroy a suspended device and we had adapted some
drivers to use them. Now that these functions are no longer necessary,
it seems reasonable to remove them and modify their users to use the
normal device unregistration instead.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
|
|
Make it possible to unregister a misc device object in a safe way during a
suspend/resume cycle.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Michael Buesch <mb@bu3sch.de>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: "John W. Linville" <linville@tuxdriver.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Len Brown <lenb@kernel.org>
Cc: Greg KH <greg@kroah.com>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
|
Use the minor number (232) allocated to kvm by lanana.
Signed-off-by: Avi Kivity <avi@qumranet.com>
|
|
This also ment that some of the misc drivers had to also be fixed
up as they were assuming the device was a class_device.
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
|
|
Also fixes all drivers that set this field.
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
|
|
Mark the f_ops members of inodes as const, as well as fix the
ripple-through this causes by places that copy this f_ops and then "do
stuff" with it.
Signed-off-by: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
|
|
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
|
|
Currently misc_register() throws away the return from
class_simple_device_add(). This makes it impossible to get to the
class_device of the directories in /sys/class/misc and, for example,
thus impossible to add attributes to those directories.
Attached patch adds a class_device structure to the miscdevice structure
and assigns to it the value returned from class_simple_device_add() in
misc_register(), thus caching the value and allowing us to f.e. later
call class_device_create_file().
We need this for inotify, but I can see plenty of other misc. devices
wanting this and consider it missing but required functionality.
Add the class_device structure to miscdevice so that we can add sysfs
attributes to /sys/class/misc/foo
Signed-Off-By: Robert Love <rml@novell.com>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
|
|
SGI has been using this driver under Linux since 2001 but it was
never included in the upstream kernel. SuSE did include the patch for mmtimer
in SLES 9. The driver has been widely used for applications on the Altix
platform.
The timer hardware was designed around the multimedia timer specification by
Intel but to my knowledge only SGI has implemented that standard. The driver
was written by Jesse Barnes.
The second revision has interrupt support removed and was somewhat simplified
by removing one include file.
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
|
|
Remove the last leftovers of the compatibility code for running the IRIX X
server.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
|
|
I eliminated the request_irq brain damage, chopped off procfs support
(didn't care for it too much in the first place and it was adopted from
rtc.c), made the check for FMODE_WRITE in hpet_open and responded to a few
other suggestions.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
|
|
The driver supports the High Precision Event Timer. The driver has adopted
a similar API to the Real Time Clock driver. It can support any number of
HPET devices and the maximum number of timers per HPET device. For further
information look at the documentation in the patch.
Thanks to Venki at Intel for testing the driver on X86 hardware with HPET.
HPET documentation is available at http://www.intel.com/design/chipsets/datashts/252516.htm
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
|
|
From: Paul Mundt <lethal@linux-sh.org>
This is the rest of the sh update, which includes everything else
sh-specific, general cleanups, bugfixes, etc. Nothing really eventful.
|
|
|
|
This adds class/misc/ for all misc devices (ones that use the
misc_register() function).
|
|
From: Christoph Hellwig <hch@lst.de>
keeping init order the same..
|
|
Use list macros for misc_device list.
|
|
From: Rusty Russell <rusty@rustcorp.com.au>
Previously, default aliases were hardwired into modutils. Now they should
be inside the modules, using MODULE_ALIAS() (they will be overridden by any
user alias).
|
|
Now that devfs_handle_t is gone from all structs there is no
reason to include it in headers.
Fix the fallout by including previously implicit headers and fixing
the drivers that didn't include devfs_fs_kernel.h explicitly.
|
|
|
|
This doesn't mean dmapi is scheduled for inclusion, just adding
the reserved minor number to miscdevice.h for documentation purposes.
|
|
M68k input drivers cleanup:
- Remove remnants from the old input layer:
o Config.help entries for the Amiga and Atari mouse drivers
o Apollo keyboard code (including beep support)
o Dummy keyboard initialization, keyboard repeat, and keyboard LEDs code
for MVME147, Sun-3, Sun-3x,
o Makefile entries for Atari keyboard, mouse and joystick drivers, and
the HP300 Human Interface Loop driver
o kbd-reset kernel command line parameters
o defconfig entry for the Amiga mouse driver
o Mac ADB mouse driver glue
o Amiga and Mac ADB mouse driver minors
- Always include new input layer configuration data
|
|
- me/Al Viro: fix bdget() oops with block device modules that don't
clean up after they exit
- Alan Cox: continued merging (drivers, license tags)
- David Miller: sparc update, network fixes
- Christoph Hellwig: work around broken drivers that add a gendisk more
than once
- Jakub Jelinek: handle more ELF loading special cases
- Trond Myklebust: NFS client and lockd reclaimer cleanups/fixes
- Greg KH: USB updates
- Mikael Pettersson: sparate out local APIC / IO-APIC config options
|
|
- Hui-Fen Hsu: sis900 driver update
- NIIBE Yutaka: Super-H update
- Alan Cox: more resyncs (ARM down, but more to go)
- David Miller: network zerocopy, Sparc sync, qlogic,FC fix, etc.
- David Miller/me: get rid of various drivers hacks to do mmap
alignment behind the back of the VM layer. Create a real
protocol for it.
|
|
|
