linux.git/drivers/xen, branch v3.7-rc5

Merge tag 'stable/for-linus-3.7-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen

2012-11-10T05:56:21+00:00

Pull Xen fixes from Konrad Rzeszutek Wilk:
 "There are three ARM compile fixes (we forgot to export certain
  functions and if the drivers are built as an module - we go belly-up).

  There is also an mismatch of irq_enter() / exit_idle() calls sequence
  which were fixed some time ago in other piece of codes, but failed to
  appear in the Xen code.

  Lastly a fix for to help in the field with troubleshooting in case we
  cannot get the appropriate parameter and also fallback code when
  working with very old hypervisors."

Bug-fixes:
 - Fix compile issues on ARM.
 - Fix hypercall fallback code for old hypervisors.
 - Print out which HVM parameter failed if it fails.
 - Fix idle notifier call after irq_enter.

* tag 'stable/for-linus-3.7-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen:
  xen/arm: Fix compile errors when drivers are compiled as modules (export more).
  xen/arm: Fix compile errors when drivers are compiled as modules.
  xen/generic: Disable fallback build on ARM.
  xen/events: fix RCU warning, or Call idle notifier after irq_enter()
  xen/hvm: If we fail to fetch an HVM parameter print out which flag it is.
  xen/hypercall: fix hypercall fallback code for very old hypervisors

xen/generic: Disable fallback build on ARM.

2012-11-07T15:46:07+00:00

As there is no need for it (the fallback code is for older
hypervisors and they only run under x86), and also b/c
we get:

drivers/xen/fallback.c: In function 'xen_event_channel_op_compat':
drivers/xen/fallback.c:10:19: error: storage size of 'op' isn't known
drivers/xen/fallback.c:15:2: error: implicit declaration of function '_hypercall1' [-Werror=implicit-function-declaration]
drivers/xen/fallback.c:15:19: error: expected expression before 'int'
drivers/xen/fallback.c:18:7: error: 'EVTCHNOP_close' undeclared (first use in this function)
drivers/xen/fallback.c:18:7: note: each undeclared identifier is reported only once for each function it appears in
.. and more

[v1: Moved the enablement to be covered by CONFIG_X86 per Ian's suggestion]
Signed-off-by: Konrad Rzeszutek Wilk

xen/events: fix RCU warning, or Call idle notifier after irq_enter()

2012-11-07T15:41:27+00:00

exit_idle() should be called after irq_enter(), otherwise it throws:

[ INFO: suspicious RCU usage. ]
3.6.5 #1 Not tainted
-------------------------------
include/linux/rcupdate.h:725 rcu_read_lock() used illegally while idle!

other info that might help us debug this:

RCU used illegally from idle CPU!
rcu_scheduler_active = 1, debug_locks = 1
RCU used illegally from extended quiescent state!
1 lock held by swapper/0/0:
 #0:  (rcu_read_lock){......}, at: [] __atomic_notifier_call_chain+0x0/0x140

stack backtrace:
Pid: 0, comm: swapper/0 Not tainted 3.6.5 #1
Call Trace:
   [] lockdep_rcu_suspicious+0xe2/0x130
 [] __atomic_notifier_call_chain+0x12c/0x140
 [] ? atomic_notifier_chain_unregister+0x90/0x90
 [] ? trace_hardirqs_off+0xd/0x10
 [] atomic_notifier_call_chain+0x16/0x20
 [] exit_idle+0x43/0x50
 [] xen_evtchn_do_upcall+0x25/0x50
 [] xen_do_hypervisor_callback+0x1e/0x30
   [] ? hypercall_page+0x3aa/0x1000
 [] ? hypercall_page+0x3aa/0x1000
 [] ? xen_safe_halt+0x10/0x20
 [] ? default_idle+0xba/0x570
 [] ? cpu_idle+0xdf/0x140
 [] ? rest_init+0x135/0x144
 [] ? csum_partial_copy_generic+0x16c/0x16c
 [] ? start_kernel+0x3db/0x3e8
 [] ? repair_env_string+0x5a/0x5a
 [] ? x86_64_start_reservations+0x131/0x135
 [] ? xen_start_kernel+0x465/0x46

Git commit 98ad1cc14a5c4fd658f9d72c6ba5c86dfd3ce0d5
Author: Frederic Weisbecker 
Date:   Fri Oct 7 18:22:09 2011 +0200

    x86: Call idle notifier after irq_enter()

did this, but it missed the Xen code.

Signed-off-by: Mojiong Qiu 
Cc: stable@vger.kernel.org # from 3.3 and newer.
Signed-off-by: Konrad Rzeszutek Wilk

xen/hypercall: fix hypercall fallback code for very old hypervisors

2012-11-04T15:40:42+00:00

While copying the argument structures in HYPERVISOR_event_channel_op()
and HYPERVISOR_physdev_op() into the local variable is sufficiently
safe even if the actual structure is smaller than the container one,
copying back eventual output values the same way isn't: This may
collide with on-stack variables (particularly "rc") which may change
between the first and second memcpy() (i.e. the second memcpy() could
discard that change).

Move the fallback code into out-of-line functions, and handle all of
the operations known by this old a hypervisor individually: Some don't
require copying back anything at all, and for the rest use the
individual argument structures' sizes rather than the container's.

Reported-by: Dan Carpenter 
Signed-off-by: Jan Beulich 
[v2: Reduce #define/#undef usage in HYPERVISOR_physdev_op_compat().]
[v3: Fix compile errors when modules use said hypercalls]
[v4: Add xen_ prefix to the HYPERCALL_..]
[v5: Alter the name and only EXPORT_SYMBOL_GPL one of them]
Signed-off-by: Konrad Rzeszutek Wilk

Merge tag 'stable/for-linus-3.7-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen

2012-11-02T20:26:11+00:00

Pull Xen bugfixes from Konrad Rzeszutek Wilk:
 - Use appropriate macros instead of hand-rolling our own (ARM).
 - Fixes if FB/KBD closed unexpectedly.
 - Fix memory leak in /dev/gntdev ioctl calls.
 - Fix overflow check in xenbus_file_write.
 - Document cleanup.
 - Performance optimization when migrating guests.

* tag 'stable/for-linus-3.7-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen:
  xen/mmu: Use Xen specific TLB flush instead of the generic one.
  xen/arm: use the __HVC macro
  xen/xenbus: fix overflow check in xenbus_file_write()
  xen-kbdfront: handle backend CLOSED without CLOSING
  xen-fbfront: handle backend CLOSED without CLOSING
  xen/gntdev: don't leak memory from IOCTL_GNTDEV_MAP_GRANT_REF
  x86: remove obsolete comment from asm/xen/hypervisor.h

xen/xenbus: fix overflow check in xenbus_file_write()

2012-10-30T13:57:49+00:00

Acked-by: Ian Campbell 
Reported-by: Dan Carpenter 
Signed-off-by: Jan Beulich 
[v1: Rebased on upstream]
Signed-off-by: Konrad Rzeszutek Wilk

xen/gntdev: don't leak memory from IOCTL_GNTDEV_MAP_GRANT_REF

2012-10-30T13:27:32+00:00

map->kmap_ops allocated in gntdev_alloc_map() wasn't freed by
gntdev_put_map().

Add a gntdev_free_map() helper function to free everything allocated
by gntdev_alloc_map().

Signed-off-by: David Vrabel 
Cc: stable@vger.kernel.org
Signed-off-by: Konrad Rzeszutek Wilk

Merge branch 'fixes' of git://git.linaro.org/people/rmk/linux-arm

2012-10-25T22:59:34+00:00

Pull ARM fixes from Russell King:
 "A random collection of various fixes, mainly from Arnd and a few other
  people.  Not thing really stands out here."

* 'fixes' of git://git.linaro.org/people/rmk/linux-arm:
  ARM: drop experimental status for hotplug and Thumb2
  ARM: 7560/1: SMP_TWD: use DIV_ROUND_CLOSEST() for periodic mode
  ARM: 7559/1: smp: switch away from the idmap before updating init_mm.mm_count
  ARM: 7556/1: perf: fix updated event period in response to PERF_EVENT_IOC_PERIOD
  ARM: 7555/1: kexec: fix segment memory addresses check
  ARM: warnings in arch/arm/include/asm/uaccess.h
  ARM: binfmt_flat: unused variable 'persistent'
  ARM: be really quiet when building with 'make -s'
  ARM: pass -marm to gcc by default for both C and assembler
  ARM: Xen: fix initial build problems
  ARM: export default read_current_timer
  ARM: Fix another build warning in arch/arm/mm/alignment.c
  ARM: export set_irq_flags
  ARM: kprobes: make more tests conditional

Merge tag 'fixes-for-rmk' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc into fixes

2012-10-22T21:56:09+00:00

xen: dbgp: Fix warning when CONFIG_PCI is not enabled.

2012-10-19T19:19:37+00:00

I saw this on ARM:
linux/drivers/xen/dbgp.c:11:23: warning: unused variable 'ctrlr' [-Wunused-variable]

Acked-by: Stefano Stabellini 
Signed-off-by: Ian Campbell 
Acked-by: Jan Beulich 
Signed-off-by: Konrad Rzeszutek Wilk