GitHub/moto-9609/android_kernel_motorola_exynos9610.git
8 years agodrm/amdgpu: fix fiji smu fini mem leak
Monk Liu [Mon, 30 May 2016 07:16:04 +0000 (15:16 +0800)]
drm/amdgpu: fix fiji smu fini mem leak

Signed-off-by: Monk Liu <Monk.Liu@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
8 years agodrm/amdgpu: fix cik sdma ucode memleak
Monk Liu [Mon, 30 May 2016 08:07:40 +0000 (16:07 +0800)]
drm/amdgpu: fix cik sdma ucode memleak

Signed-off-by: Monk Liu <Monk.Liu@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
8 years agodrm/amdgpu: fix sdma24 ucode mem leak
Monk Liu [Mon, 30 May 2016 08:05:58 +0000 (16:05 +0800)]
drm/amdgpu: fix sdma24 ucode mem leak

Signed-off-by: Monk Liu <Monk.Liu@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
8 years agodrm/amdgpu: fix sdma3 ucode mem leak
Monk Liu [Mon, 30 May 2016 07:15:32 +0000 (15:15 +0800)]
drm/amdgpu: fix sdma3 ucode mem leak

Signed-off-by: Monk Liu <Monk.Liu@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
8 years agodrm/amdgpu: fix uvd fini mem leak
Monk Liu [Mon, 30 May 2016 07:13:59 +0000 (15:13 +0800)]
drm/amdgpu: fix uvd fini mem leak

Signed-off-by: Monk Liu <Monk.Liu@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
8 years agodrm/amdgpu: fix gfx 7 ucode mem leak
Monk Liu [Mon, 30 May 2016 08:01:48 +0000 (16:01 +0800)]
drm/amdgpu: fix gfx 7 ucode mem leak

Signed-off-by: Monk Liu <Monk.Liu@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
8 years agodrm/amdgpu: fix gfx8 ucode mem leak
Monk Liu [Mon, 30 May 2016 06:18:57 +0000 (14:18 +0800)]
drm/amdgpu: fix gfx8 ucode mem leak

Signed-off-by: Monk Liu <Monk.Liu@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
8 years agodrm/amdgpu: fix missing free wb for cond_exec
Monk Liu [Mon, 30 May 2016 06:17:42 +0000 (14:17 +0800)]
drm/amdgpu: fix missing free wb for cond_exec

Signed-off-by: Monk Liu <Monk.Liu@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
8 years agodrm/amdgpu: fix memleak in pptable_init
Monk Liu [Mon, 30 May 2016 05:43:45 +0000 (13:43 +0800)]
drm/amdgpu: fix memleak in pptable_init

Signed-off-by: Monk Liu <Monk.Liu@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
8 years agodrm/amdgpu: fix mem leak in atombios
Monk Liu [Fri, 27 May 2016 11:34:11 +0000 (19:34 +0800)]
drm/amdgpu: fix mem leak in atombios

Signed-off-by: Monk Liu <Monk.Liu@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
8 years agodrm/amdgpu: fix mem leak in pplib/hwmgr
Monk Liu [Fri, 27 May 2016 11:09:06 +0000 (19:09 +0800)]
drm/amdgpu: fix mem leak in pplib/hwmgr

Signed-off-by: Monk Liu <Monk.Liu@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
8 years agodrm/amdgpu: fix mem leak in smumgr
Monk Liu [Fri, 27 May 2016 09:52:58 +0000 (17:52 +0800)]
drm/amdgpu: fix mem leak in smumgr

Signed-off-by: Monk Liu <Monk.Liu@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
8 years agodrm/amdgpu: add pipeline sync while vmid switch in same ctx
Chunming Zhou [Wed, 27 Apr 2016 10:07:41 +0000 (18:07 +0800)]
drm/amdgpu: add pipeline sync while vmid switch in same ctx

Since vmid-mgr supports vmid sharing in one vm, the same ctx could
get different vmids for two emits without vm flush, vm_flush could
be done in another ring.

Signed-off-by: Chunming Zhou <David1.Zhou@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
8 years agodrm/amdgpu: vBIOS post only call when mem_size zero
Monk Liu [Tue, 24 May 2016 05:23:46 +0000 (13:23 +0800)]
drm/amdgpu: vBIOS post only call when mem_size zero

Signed-off-by: Monk Liu <Monk.Liu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
8 years agodrm/amdgpu: modify sdma start sequence
Monk Liu [Wed, 25 May 2016 08:57:14 +0000 (16:57 +0800)]
drm/amdgpu: modify sdma start sequence

should fist halt engine, and then doing the register
programing, and later unhalt engine, and finally run
ring_test.

this help fix reloading driver hang issue of SDMA
ring

original sequence is wrong for it programing engine
after unhalt, which will lead to fault behavior when
doing driver reloading after unloaded.

Signed-off-by: Monk Liu <Monk.Liu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
8 years agodrm/amdgpu: init more register for sdma
Monk Liu [Wed, 25 May 2016 08:55:50 +0000 (16:55 +0800)]
drm/amdgpu: init more register for sdma

This help fix reloading driver hang issue of SDMA
ring

Signed-off-by: Monk Liu <Monk.Liu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
8 years agodrm/amdgpu: clear SA bo when created
Monk Liu [Wed, 25 May 2016 08:55:07 +0000 (16:55 +0800)]
drm/amdgpu: clear SA bo when created

This help fix reloading driver hang issue of SDMA
ring

Signed-off-by: Monk Liu <Monk.Liu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
8 years agodrm/amdgpu: fix fw leak in non-powerplay dpm code
Alex Deucher [Wed, 1 Jun 2016 15:09:01 +0000 (11:09 -0400)]
drm/amdgpu: fix fw leak in non-powerplay dpm code

We need to release the firmware on driver tear down.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
8 years agodrm/amdgpu: fix pplib finish bug
Monk Liu [Thu, 19 May 2016 06:36:34 +0000 (14:36 +0800)]
drm/amdgpu: fix pplib finish bug

1,should use late_fini to kfree all resource otherwise
the released pointer maybe accessed in IRQ ip fini routine.

2,hwmgr should not be kfree by pem_fini which is invoked
by hw fini path.

Signed-off-by: Monk Liu <Monk.Liu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
8 years agodrm/amdgpu: impl late_fini for amdgpu_pp_ip
Monk Liu [Thu, 19 May 2016 06:36:01 +0000 (14:36 +0800)]
drm/amdgpu: impl late_fini for amdgpu_pp_ip

This implements late_init support for powerplay.

Signed-off-by: Monk Liu <Monk.Liu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
8 years agodrm/amdgpu: add late_fini for ip_funcs
Monk Liu [Thu, 19 May 2016 06:35:17 +0000 (14:35 +0800)]
drm/amdgpu: add late_fini for ip_funcs

This give IP modules an optional late cleanup
function.  This is needed to handle tricky inter-module
dependencies during tear down.

Signed-off-by: Monk Liu <Monk.Liu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
8 years agodrm/admgpu/powerplay/polaris: fix powertune table upload
Rex Zhu [Mon, 23 May 2016 10:24:41 +0000 (18:24 +0800)]
drm/admgpu/powerplay/polaris: fix powertune table upload

Exclude AVFS related fields when update powertune table to hw.
The driver shouldn't set them directly.

Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
8 years agodrm/amdgpu/iceland: Set SC_PA_RASTER_CONFIG according to different RB enabled
Ken Wang [Tue, 24 May 2016 01:26:27 +0000 (09:26 +0800)]
drm/amdgpu/iceland: Set SC_PA_RASTER_CONFIG according to different RB enabled

fix the raster config setting for different iceland configs.

Signed-off-by: Ken Wang <Qingqing.Wang@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
8 years agoMerge tag 'drm-vc4-fixes-2016-06-06' of github.com:anholt/linux into drm-fixes
Dave Airlie [Thu, 9 Jun 2016 02:32:09 +0000 (12:32 +1000)]
Merge tag 'drm-vc4-fixes-2016-06-06' of github.com:anholt/linux into drm-fixes

This pull request brings in vblank/pageflip fixes I had hoped to see
merged before 4.7rc1, plus two new fixes that have come in since then.

* tag 'drm-vc4-fixes-2016-06-06' of github.com:anholt/linux:
  drm/vc4: Make pageflip completion handling more robust.
  drm/vc4: Fix ioctl permissions for render nodes.
  drm/vc4: Return -EBUSY if there's already a pending flip event.
  drm/vc4: Fix drm_vblank_put/get imbalance in page flip path.
  drm/vc4: Fix get_vblank_counter with proper no-op for Linux 4.4+

8 years agodrm/omap: fix unused variable warning in dsi & hdmi
Tomi Valkeinen [Fri, 3 Jun 2016 11:27:03 +0000 (14:27 +0300)]
drm/omap: fix unused variable warning in dsi & hdmi

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
8 years agoMerge branch 'linux-4.7' of git://github.com/skeggsb/linux into drm-fixes
Dave Airlie [Thu, 9 Jun 2016 02:30:29 +0000 (12:30 +1000)]
Merge branch 'linux-4.7' of git://github.com/skeggsb/linux into drm-fixes

Fixes for two issues reported by KASAN, a display engine hang due to
incorrect BIOS table parsing, and incorrect LTC interrupt handling on
Maxwell which could lead to a never-ending interrupt storm.

* 'linux-4.7' of git://github.com/skeggsb/linux:
  drm/nouveau/disp/sor/gm107: training pattern registers are like gm200
  drm/nouveau/disp/sor/gf119: both links use the same training register
  drm/nouveau/core: swap the order of imem/fb
  drm/nouveau/fbcon: fix out-of-bounds memory accesses
  drm/nouveau/gr/gf100-: update sm error decoding from gk20a nvgpu headers
  drm/nouveau/ltc/gm107-: fix typo in the address of NV_PLTCG_LTC0_LTS0_INTR
  drm/nouveau/bios/disp: fix handling of "match any protocol" entries

8 years agodrm/nouveau/disp/sor/gm107: training pattern registers are like gm200
Ben Skeggs [Fri, 3 Jun 2016 05:05:52 +0000 (15:05 +1000)]
drm/nouveau/disp/sor/gm107: training pattern registers are like gm200

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Cc: stable@vger.kernel.org
8 years agodrm/nouveau/disp/sor/gf119: both links use the same training register
Ben Skeggs [Fri, 3 Jun 2016 04:37:40 +0000 (14:37 +1000)]
drm/nouveau/disp/sor/gf119: both links use the same training register

It appears that, for whatever reason, both link A and B use the same
register to control the training pattern.  It's a little odd, as the
GPUs before this (Tesla/Fermi1) have per-link registers, as do newer
GPUs (Maxwell).

Fixes the third DP output on NVS 510 (GK107).

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Cc: stable@vger.kernel.org
8 years agodrm/vc4: Make pageflip completion handling more robust.
Mario Kleiner [Wed, 18 May 2016 12:02:46 +0000 (14:02 +0200)]
drm/vc4: Make pageflip completion handling more robust.

Protect both the setup of the pageflip event and the
latching of the new requested displaylist head pointer
by the event lock, so we can't get into a situation
where vc4_atomic_flush latches the new display list via
HVS_WRITE, then immediately gets preempted before queueing
the pageflip event, then the page-flip completes in hw and
the vc4_crtc_handle_page_flip() runs and no-ops due to
lack of a pending pageflip event, then vc4_atomic_flush
continues and only then queues the pageflip event - after
the page flip handling already no-oped. This would cause
flip completion handling only at the next vblank - one
frame too late.

In vc4_crtc_handle_page_flip() check the actual DL head
pointer in SCALER_DISPLACTX against the requested pointer
for page flip to make sure that the flip actually really
completed in the current vblank and doesn't get deferred
to the next one because the DL head pointer was written
a bit too late into SCALER_DISPLISTX, after start of
vblank, and missed the boat. This avoids handling a
pageflip completion too early - one frame too early.

According to Eric, DL head pointer updates which were
written into the HVS DISPLISTX reg get committed to hardware
at the last pixel of active scanout. Our vblank interrupt
handler, as triggered by PV_INT_VFP_START irq, gets to run
earliest at the first pixel of HBLANK at the end of the
last scanline of active scanout, ie. vblank irq handling
runs at least 1 pixel duration after a potential pageflip
completion happened in hardware.

This ordering of events in the hardware, together with the
lock protection and SCALER_DISPLACTX sampling of this patch,
guarantees that pageflip completion handling only runs at
exactly the vblank irq of actual pageflip completion in all
cases.

Background info from Eric about the relative timing of
HVS, PV's and trigger points for interrupts, DL updates:

https://lists.freedesktop.org/archives/dri-devel/2016-May/107510.html

Tested on RPi 2B with hardware timing measurement equipment
and shown to no longer complete flips too early or too late.

Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
8 years agodrm/vc4: Fix ioctl permissions for render nodes.
Herve Jourdain [Tue, 31 May 2016 18:24:46 +0000 (02:24 +0800)]
drm/vc4: Fix ioctl permissions for render nodes.

Contrary to other flags to DRM_IOCTL_DEF_DRV(), which restrict usage,
the flag for render node is an enabler (the IOCTL can't be used from
render node if it's not present).  So DRM_RENDER_ALLOW needs to be
added to all the flags that were previously 0.

Signed-off-by: Herve Jourdain <herve.jourdain@neuf.fr>
Reviewed-by: Eric Anholt <eric@anholt.net>
Fixes: 0cd3e2747662 ("drm/vc4: Add missing render node support")

8 years agoLinux 4.7-rc2
Linus Torvalds [Sun, 5 Jun 2016 21:31:26 +0000 (14:31 -0700)]
Linux 4.7-rc2

8 years agoMerge branch 'parisc-4.7-2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller...
Linus Torvalds [Sun, 5 Jun 2016 18:15:33 +0000 (11:15 -0700)]
Merge branch 'parisc-4.7-2' of git://git./linux/kernel/git/deller/parisc-linux

Pull parisc fixes from Helge Deller:

 - Fix printk time stamps on SMP systems which got wrong due to a patch
   which was added during the merge window

 - Fix two bugs in the stack backtrace code: Races in module unloading
   and possible invalid accesses to memory due to wrong instruction
   decoding (Mikulas Patocka)

 - Fix userspace crash when syscalls access invalid unaligned userspace
   addresses.  Those syscalls will now return EFAULT as expected.
   (tagged for stable kernel series)

* 'parisc-4.7-2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux:
  parisc: Move die_if_kernel() prototype into traps.h header
  parisc: Fix pagefault crash in unaligned __get_user() call
  parisc: Fix printk time during boot
  parisc: Fix backtrace on PA-RISC

8 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris...
Linus Torvalds [Sun, 5 Jun 2016 18:02:00 +0000 (11:02 -0700)]
Merge branch 'for-linus' of git://git./linux/kernel/git/jmorris/linux-security

Pull key handling update from James Morris:
 "This alters a new keyctl function added in the current merge window to
  allow for a future extension planned for the next merge window"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security:
  KEYS: Add placeholder for KDF usage with DH

8 years agodevpts: Make each mount of devpts an independent filesystem.
Eric W. Biederman [Thu, 2 Jun 2016 15:29:47 +0000 (10:29 -0500)]
devpts: Make each mount of devpts an independent filesystem.

The /dev/ptmx device node is changed to lookup the directory entry "pts"
in the same directory as the /dev/ptmx device node was opened in.  If
there is a "pts" entry and that entry is a devpts filesystem /dev/ptmx
uses that filesystem.  Otherwise the open of /dev/ptmx fails.

The DEVPTS_MULTIPLE_INSTANCES configuration option is removed, so that
userspace can now safely depend on each mount of devpts creating a new
instance of the filesystem.

Each mount of devpts is now a separate and equal filesystem.

Reserved ttys are now available to all instances of devpts where the
mounter is in the initial mount namespace.

A new vfs helper path_pts is introduced that finds a directory entry
named "pts" in the directory of the passed in path, and changes the
passed in path to point to it.  The helper path_pts uses a function
path_parent_directory that was factored out of follow_dotdot.

In the implementation of devpts:
 - devpts_mnt is killed as it is no longer meaningful if all mounts of
   devpts are equal.
 - pts_sb_from_inode is replaced by just inode->i_sb as all cached
   inodes in the tty layer are now from the devpts filesystem.
 - devpts_add_ref is rolled into the new function devpts_ptmx.  And the
   unnecessary inode hold is removed.
 - devpts_del_ref is renamed devpts_release and reduced to just a
   deacrivate_super.
 - The newinstance mount option continues to be accepted but is now
   ignored.

In devpts_fs.h definitions for when !CONFIG_UNIX98_PTYS are removed as
they are never used.

Documentation/filesystems/devices.txt is updated to describe the current
situation.

This has been verified to work properly on openwrt-15.05, centos5,
centos6, centos7, debian-6.0.2, debian-7.9, debian-8.2, ubuntu-14.04.3,
ubuntu-15.10, fedora23, magia-5, mint-17.3, opensuse-42.1,
slackware-14.1, gentoo-20151225 (13.0?), archlinux-2015-12-01.  With the
caveat that on centos6 and on slackware-14.1 that there wind up being
two instances of the devpts filesystem mounted on /dev/pts, the lower
copy does not end up getting used.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Greg KH <greg@kroah.com>
Cc: Peter Hurley <peter@hurleysoftware.com>
Cc: Peter Anvin <hpa@zytor.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Serge Hallyn <serge.hallyn@ubuntu.com>
Cc: Willy Tarreau <w@1wt.eu>
Cc: Aurelien Jarno <aurelien@aurel32.net>
Cc: One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>
Cc: Jann Horn <jann@thejh.net>
Cc: Jiri Slaby <jslaby@suse.com>
Cc: Florian Weimer <fw@deneb.enyo.de>
Cc: Konstantin Khlebnikov <koct9i@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agoparisc: Move die_if_kernel() prototype into traps.h header
Helge Deller [Sat, 4 Jun 2016 15:38:09 +0000 (17:38 +0200)]
parisc: Move die_if_kernel() prototype into traps.h header

Signed-off-by: Helge Deller <deller@gmx.de>
8 years agoparisc: Fix pagefault crash in unaligned __get_user() call
Helge Deller [Sat, 4 Jun 2016 15:21:33 +0000 (17:21 +0200)]
parisc: Fix pagefault crash in unaligned __get_user() call

One of the debian buildd servers had this crash in the syslog without
any other information:

 Unaligned handler failed, ret = -2
 clock_adjtime (pid 22578): Unaligned data reference (code 28)
 CPU: 1 PID: 22578 Comm: clock_adjtime Tainted: G  E  4.5.0-2-parisc64-smp #1 Debian 4.5.4-1
 task: 000000007d9960f8 ti: 00000001bde7c000 task.ti: 00000001bde7c000

      YZrvWESTHLNXBCVMcbcbcbcbOGFRQPDI
 PSW: 00001000000001001111100000001111 Tainted: G            E
 r00-03  000000ff0804f80f 00000001bde7c2b0 00000000402d2be8 00000001bde7c2b0
 r04-07  00000000409e1fd0 00000000fa6f7fff 00000001bde7c148 00000000fa6f7fff
 r08-11  0000000000000000 00000000ffffffff 00000000fac9bb7b 000000000002b4d4
 r12-15  000000000015241c 000000000015242c 000000000000002d 00000000fac9bb7b
 r16-19  0000000000028800 0000000000000001 0000000000000070 00000001bde7c218
 r20-23  0000000000000000 00000001bde7c210 0000000000000002 0000000000000000
 r24-27  0000000000000000 0000000000000000 00000001bde7c148 00000000409e1fd0
 r28-31  0000000000000001 00000001bde7c320 00000001bde7c350 00000001bde7c218
 sr00-03  0000000001200000 0000000001200000 0000000000000000 0000000001200000
 sr04-07  0000000000000000 0000000000000000 0000000000000000 0000000000000000

 IASQ: 0000000000000000 0000000000000000 IAOQ: 00000000402d2e84 00000000402d2e88
  IIR: 0ca0d089    ISR: 0000000001200000  IOR: 00000000fa6f7fff
  CPU:        1   CR30: 00000001bde7c000 CR31: ffffffffffffffff
  ORIG_R28: 00000002369fe628
  IAOQ[0]: compat_get_timex+0x2dc/0x3c0
  IAOQ[1]: compat_get_timex+0x2e0/0x3c0
  RP(r2): compat_get_timex+0x40/0x3c0
 Backtrace:
  [<00000000402d4608>] compat_SyS_clock_adjtime+0x40/0xc0
  [<0000000040205024>] syscall_exit+0x0/0x14

This means the userspace program clock_adjtime called the clock_adjtime()
syscall and then crashed inside the compat_get_timex() function.
Syscalls should never crash programs, but instead return EFAULT.

The IIR register contains the executed instruction, which disassebles
into "ldw 0(sr3,r5),r9".
This load-word instruction is part of __get_user() which tried to read the word
at %r5/IOR (0xfa6f7fff). This means the unaligned handler jumped in.  The
unaligned handler is able to emulate all ldw instructions, but it fails if it
fails to read the source e.g. because of page fault.

The following program reproduces the problem:

#define _GNU_SOURCE
#include <unistd.h>
#include <sys/syscall.h>
#include <sys/mman.h>

int main(void) {
        /* allocate 8k */
        char *ptr = mmap(NULL, 2*4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
        /* free second half (upper 4k) and make it invalid. */
        munmap(ptr+4096, 4096);
        /* syscall where first int is unaligned and clobbers into invalid memory region */
        /* syscall should return EFAULT */
        return syscall(__NR_clock_adjtime, 0, ptr+4095);
}

To fix this issue we simply need to check if the faulting instruction address
is in the exception fixup table when the unaligned handler failed. If it
is, call the fixup routine instead of crashing.

While looking at the unaligned handler I found another issue as well: The
target register should not be modified if the handler was unsuccessful.

Signed-off-by: Helge Deller <deller@gmx.de>
Cc: stable@vger.kernel.org
8 years agoparisc: Fix printk time during boot
Helge Deller [Fri, 3 Jun 2016 17:22:31 +0000 (19:22 +0200)]
parisc: Fix printk time during boot

Avoid showing invalid printk time stamps during boot.

Signed-off-by: Helge Deller <deller@gmx.de>
Reviewed-by: Aaro Koskinen <aaro.koskinen@iki.fi>
8 years agoparisc: Fix backtrace on PA-RISC
Mikulas Patocka [Tue, 28 Jun 2011 22:48:19 +0000 (00:48 +0200)]
parisc: Fix backtrace on PA-RISC

This patch fixes backtrace on PA-RISC

There were several problems:

1) The code that decodes instructions handles instructions that subtract
from the stack pointer incorrectly. If the instruction subtracts the
number X from the stack pointer the code increases the frame size by
(0x100000000-X).  This results in invalid accesses to memory and
recursive page faults.

2) Because gcc reorders blocks, handling instructions that subtract from
the frame pointer is incorrect. For example, this function
int f(int a)
{
if (__builtin_expect(a, 1))
return a;
g();
return a;
}
is compiled in such a way, that the code that decreases the stack
pointer for the first "return a" is placed before the code for "g" call.
If we recognize this decrement, we mistakenly believe that the frame
size for the "g" call is zero.

To fix problems 1) and 2), the patch doesn't recognize instructions that
decrease the stack pointer at all. To further safeguard the unwind code
against nonsense values, we don't allow frame size larger than
Total_frame_size.

3) The backtrace is not locked. If stack dump races with module unload,
invalid table can be accessed.

This patch adds a spinlock when processing module tables.

Note, that for correct backtrace, you need recent binutils.
Binutils 2.18 from Debian 5 produce garbage unwind tables.
Binutils 2.21 work better (it sometimes forgets function frames, but at
least it doesn't generate garbage).

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Helge Deller <deller@gmx.de>
8 years agoMerge tag 'drm-fixes-for-v4.7-rc2' of git://people.freedesktop.org/~airlied/linux
Linus Torvalds [Sat, 4 Jun 2016 19:30:36 +0000 (12:30 -0700)]
Merge tag 'drm-fixes-for-v4.7-rc2' of git://people.freedesktop.org/~airlied/linux

Pull drm fixes from Dave Airlie:
 "A bunch of ARM drivers got into the fixes vibe this time around, so
  this contains a bunch of fixes for imx, atmel hlcdc, arm hdlcd (only
  so many combos of hlcd), mediatek and omap drm.

  Other than that there is one mgag200 fix and a few core drm regression
  fixes"

* tag 'drm-fixes-for-v4.7-rc2' of git://people.freedesktop.org/~airlied/linux: (34 commits)
  drm/omap: fix unused variable warning.
  drm: hdlcd: Add information about the underlying framebuffers in debugfs
  drm: hdlcd: Cleanup the atomic plane operations
  drm/hdlcd: Fix up crtc_state->event handling
  drm: hdlcd: Revamp runtime power management
  drm/mediatek: mtk_dsi: Remove spurious drm_connector_unregister
  drm/mediatek: mtk_dpi: remove invalid error message
  drm: atmel-hlcdc: fix a NULL check
  drm: atmel-hlcdc: fix atmel_hlcdc_crtc_reset() implementation
  drm/mgag200: Black screen fix for G200e rev 4
  drm: Wrap direct calls to driver->gem_free_object from CMA
  drm: fix fb refcount issue with atomic modesetting
  drm: make drm_atomic_set_mode_prop_for_crtc() more reliable
  drm/sti: remove extra mode fixup
  drm: add missing drm_mode_set_crtcinfo call
  drm/omap: include gpio/consumer.h where needed
  drm/omap: include linux/seq_file.h where needed
  Revert "drm/omap: no need to select OMAP2_DSS"
  drm/omap: Remove regulator API abuse
  OMAPDSS: HDMI5: Change DDC timings
  ...

8 years agoMerge tag 'vfio-v4.7-rc2' of git://github.com/awilliam/linux-vfio
Linus Torvalds [Sat, 4 Jun 2016 19:25:36 +0000 (12:25 -0700)]
Merge tag 'vfio-v4.7-rc2' of git://github.com/awilliam/linux-vfio

Pull VFIO fixes from Alex Williamson:
 "Fix irqfd shutdown ordering, build warning, and VPD short read"

* tag 'vfio-v4.7-rc2' of git://github.com/awilliam/linux-vfio:
  vfio/pci: Allow VPD short read
  vfio/type1: Fix build warning
  vfio/pci: Fix ordering of eventfd vs virqfd shutdown

8 years agoMerge tag 'mmc-v4.7-rc1-2' of git://git.linaro.org/people/ulf.hansson/mmc
Linus Torvalds [Sat, 4 Jun 2016 19:20:26 +0000 (12:20 -0700)]
Merge tag 'mmc-v4.7-rc1-2' of git://git.linaro.org/people/ulf.hansson/mmc

Pull MMC fixes from Ulf Hansson:
 "MMC core:
   - Fix/restore behaviour when selecting bus width for (e)MMC

  MMC host:
   - sunxi: Fix eMMC HS-DDR modes on Allwinner A80"

* tag 'mmc-v4.7-rc1-2' of git://git.linaro.org/people/ulf.hansson/mmc:
  mmc: sunxi: Re-enable eMMC HS-DDR modes on Allwinner A80
  mmc: sunxi: Fix DDR MMC timings for A80
  mmc: fix mmc mode selection for HS-DDR and higher

8 years agoMerge branch 'for-linus-4.7' of git://git.kernel.org/pub/scm/linux/kernel/git/mason...
Linus Torvalds [Sat, 4 Jun 2016 18:56:28 +0000 (11:56 -0700)]
Merge branch 'for-linus-4.7' of git://git./linux/kernel/git/mason/linux-btrfs

Pull btrfs fixes from Chris Mason:
 "The important part of this pull is Filipe's set of fixes for btrfs
  device replacement.  Filipe fixed a few issues seen on the list and a
  number he found on his own"

* 'for-linus-4.7' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
  Btrfs: deal with duplciates during extent_map insertion in btrfs_get_extent
  Btrfs: fix race between device replace and read repair
  Btrfs: fix race between device replace and discard
  Btrfs: fix race between device replace and chunk allocation
  Btrfs: fix race setting block group back to RW mode during device replace
  Btrfs: fix unprotected assignment of the left cursor for device replace
  Btrfs: fix race setting block group readonly during device replace
  Btrfs: fix race between device replace and block group removal
  Btrfs: fix race between readahead and device replace/removal

8 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph...
Linus Torvalds [Sat, 4 Jun 2016 18:37:53 +0000 (11:37 -0700)]
Merge branch 'for-linus' of git://git./linux/kernel/git/sage/ceph-client

Pull Ceph fixes from Sage Weil:
 "We have a few follow-up fixes for the libceph refactor from Ilya, and
  then some cephfs + fscache fixes from Zheng.

  The first two FS-Cache patches are acked by David Howells and deemed
  trivial enough to go through our tree.  The rest fix some issues with
  the ceph fscache handling (disable cache for inodes opened for write,
  and simplify the revalidation logic accordingly, dropping the
  now-unnecessary work queue)"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client:
  ceph: use i_version to check validity of fscache
  ceph: improve fscache revalidation
  ceph: disable fscache when inode is opened for write
  ceph: avoid unnecessary fscache invalidation/revlidation
  ceph: call __fscache_uncache_page() if readpages fails
  FS-Cache: make check_consistency callback return int
  FS-Cache: wake write waiter after invalidating writes
  libceph: use %s instead of %pE in dout()s
  libceph: put request only if it's done in handle_reply()
  libceph: change ceph_osdmap_flag() to take osdc

8 years agoMerge tag 'acpi-4.7-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael...
Linus Torvalds [Sat, 4 Jun 2016 18:26:49 +0000 (11:26 -0700)]
Merge tag 'acpi-4.7-rc2' of git://git./linux/kernel/git/rafael/linux-pm

Pull ACPI fixes from Rafael Wysocki:
 "Two fixes for problems introduced recently (ACPICA and the ACPI
  backlight driver) and one fix for an older issue that prevents at
  least one system from booting.

  Specifics:

   - Fix an incorrect check introduced by recent ACPICA changes which
     causes problems with booting KVM guests to happen, among other
     things (Lv Zheng).

   - Fix a backlight issue introduced by recent changes to the ACPI
     video driver (Aaron Lu).

   - Fix the ACPI processor initialization which attempts to register an
     IO region without checking if that really is necessary and
     sometimes prevents drivers loaded subsequently from registering
     their resources which leads to boot issues (Rafael Wysocki)"

* tag 'acpi-4.7-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI / processor: Avoid reserving IO regions too early
  ACPICA / Hardware: Fix old register check in acpi_hw_get_access_bit_width()
  ACPI / Thermal / video: fix max_level incorrect value

8 years agoMerge tag 'pm-4.7-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Linus Torvalds [Sat, 4 Jun 2016 18:07:57 +0000 (11:07 -0700)]
Merge tag 'pm-4.7-rc2' of git://git./linux/kernel/git/rafael/linux-pm

Pull power management fixes from Rafael Wysocki:
 "Two fixes for problems introduced recently in the cpufreq core and the
  intel_pstate driver.

  Specifics:

   - Fix a silly mistake related to the clamp_val() usage in a function
     added by a recent commit (Rafael Wysocki).

   - Reduce the log level of an annoying message added to intel_pstate
     during the recent merge window (Srinivas Pandruvada)"

* tag 'pm-4.7-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  cpufreq: Fix clamp_val() usage in cpufreq_driver_fast_switch()
  cpufreq: intel_pstate: Downgrade print level for _PPC

8 years agoMerge branch 'akpm' (patches from Andrew)
Linus Torvalds [Sat, 4 Jun 2016 17:51:29 +0000 (10:51 -0700)]
Merge branch 'akpm' (patches from Andrew)

Merge various fixes from Andrew Morton:
 "10 fixes"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
  mm, page_alloc: recalculate the preferred zoneref if the context can ignore memory policies
  mm, page_alloc: reset zonelist iterator after resetting fair zone allocation policy
  mm, oom_reaper: do not use siglock in try_oom_reaper()
  mm, page_alloc: prevent infinite loop in buffered_rmqueue()
  checkpatch: reduce git commit description style false positives
  mm/z3fold.c: avoid modifying HEADLESS page and minor cleanup
  memcg: add RCU locking around css_for_each_descendant_pre() in memcg_offline_kmem()
  mm: check the return value of lookup_page_ext for all call sites
  kdump: fix dmesg gdbmacro to work with record based printk
  mm: fix overflow in vm_map_ram()

8 years agoMerge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Fri, 3 Jun 2016 23:12:35 +0000 (16:12 -0700)]
Merge branch 'irq-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull irq fixes from Thomas Gleixner:
 - a few simple fixes for fallout from the recent gic-v3 changes
 - a workaround for a Cavium thunderX erratum
 - a bugfix for the pic32 irqchip to make external interrupts work proper
 - a missing return value in the generic IPI management code

* 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  irqchip/irq-pic32-evic: Fix bug with external interrupts.
  irqchip/gicv3-its: numa: Enable workaround for Cavium thunderx erratum 23144
  irqchip/gic-v3: Fix quiescence check in gic_enable_redist
  irqchip/gic-v3: Fix copy+paste mistakes in defines
  irqchip/gic-v3: Fix ICC_SGI1R_EL1.INTID decoding mask
  genirq: Fix missing return value in irq_destroy_ipi()

8 years agomm, page_alloc: recalculate the preferred zoneref if the context can ignore memory...
Mel Gorman [Fri, 3 Jun 2016 21:56:01 +0000 (14:56 -0700)]
mm, page_alloc: recalculate the preferred zoneref if the context can ignore memory policies

The optimistic fast path may use cpuset_current_mems_allowed instead of
of a NULL nodemask supplied by the caller for cpuset allocations.  The
preferred zone is calculated on this basis for statistic purposes and as
a starting point in the zonelist iterator.

However, if the context can ignore memory policies due to being atomic
or being able to ignore watermarks then the starting point in the
zonelist iterator is no longer correct.  This patch resets the zonelist
iterator in the allocator slowpath if the context can ignore memory
policies.  This will alter the zone used for statistics but only after
it is known that it makes sense for that context.  Resetting it before
entering the slowpath would potentially allow an ALLOC_CPUSET allocation
to be accounted for against the wrong zone.  Note that while nodemask is
not explicitly set to the original nodemask, it would only have been
overwritten if cpuset_enabled() and it was reset before the slowpath was
entered.

Link: http://lkml.kernel.org/r/20160602103936.GU2527@techsingularity.net
Fixes: c33d6c06f60f710 ("mm, page_alloc: avoid looking up the first zone in a zonelist twice")
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Tested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agomm, page_alloc: reset zonelist iterator after resetting fair zone allocation policy
Mel Gorman [Fri, 3 Jun 2016 21:55:58 +0000 (14:55 -0700)]
mm, page_alloc: reset zonelist iterator after resetting fair zone allocation policy

Geert Uytterhoeven reported the following problem that bisected to
commit c33d6c06f60f ("mm, page_alloc: avoid looking up the first zone
in a zonelist twice") on m68k/ARAnyM

    BUG: scheduling while atomic: cron/668/0x10c9a0c0
    Modules linked in:
    CPU: 0 PID: 668 Comm: cron Not tainted 4.6.0-atari-05133-gc33d6c06f60f710f #364
    Call Trace: [<0003d7d0>] __schedule_bug+0x40/0x54
      __schedule+0x312/0x388
      __schedule+0x0/0x388
      prepare_to_wait+0x0/0x52
      schedule+0x64/0x82
      schedule_timeout+0xda/0x104
      set_next_entity+0x18/0x40
      pick_next_task_fair+0x78/0xda
      io_schedule_timeout+0x36/0x4a
      bit_wait_io+0x0/0x40
      bit_wait_io+0x12/0x40
      __wait_on_bit+0x46/0x76
      wait_on_page_bit_killable+0x64/0x6c
      bit_wait_io+0x0/0x40
      wake_bit_function+0x0/0x4e
      __lock_page_or_retry+0xde/0x124
      do_scan_async+0x114/0x17c
      lookup_swap_cache+0x24/0x4e
      handle_mm_fault+0x626/0x7de
      find_vma+0x0/0x66
      down_read+0x0/0xe
      wait_on_page_bit_killable_timeout+0x77/0x7c
      find_vma+0x16/0x66
      do_page_fault+0xe6/0x23a
      res_func+0xa3c/0x141a
      buserr_c+0x190/0x6d4
      res_func+0xa3c/0x141a
      buserr+0x20/0x28
      res_func+0xa3c/0x141a
      buserr+0x20/0x28

The relationship is not obvious but it's due to a failure to rescan the
full zonelist after the fair zone allocation policy exhausts the batch
count.  While this is a functional problem, it's also a performance
issue.  A page allocator microbenchmark showed the following

                                   4.7.0-rc1                  4.7.0-rc1
                                     vanilla                 reset-v1r2
  Min      alloc-odr0-1     327.00 (  0.00%)           326.00 (  0.31%)
  Min      alloc-odr0-2     235.00 (  0.00%)           235.00 (  0.00%)
  Min      alloc-odr0-4     198.00 (  0.00%)           198.00 (  0.00%)
  Min      alloc-odr0-8     170.00 (  0.00%)           170.00 (  0.00%)
  Min      alloc-odr0-16    156.00 (  0.00%)           156.00 (  0.00%)
  Min      alloc-odr0-32    150.00 (  0.00%)           150.00 (  0.00%)
  Min      alloc-odr0-64    146.00 (  0.00%)           146.00 (  0.00%)
  Min      alloc-odr0-128   145.00 (  0.00%)           145.00 (  0.00%)
  Min      alloc-odr0-256   155.00 (  0.00%)           155.00 (  0.00%)
  Min      alloc-odr0-512   168.00 (  0.00%)           165.00 (  1.79%)
  Min      alloc-odr0-1024  175.00 (  0.00%)           174.00 (  0.57%)
  Min      alloc-odr0-2048  180.00 (  0.00%)           180.00 (  0.00%)
  Min      alloc-odr0-4096  187.00 (  0.00%)           186.00 (  0.53%)
  Min      alloc-odr0-8192  190.00 (  0.00%)           190.00 (  0.00%)
  Min      alloc-odr0-16384 191.00 (  0.00%)           191.00 (  0.00%)
  Min      alloc-odr1-1     736.00 (  0.00%)           445.00 ( 39.54%)
  Min      alloc-odr1-2     343.00 (  0.00%)           335.00 (  2.33%)
  Min      alloc-odr1-4     277.00 (  0.00%)           270.00 (  2.53%)
  Min      alloc-odr1-8     238.00 (  0.00%)           233.00 (  2.10%)
  Min      alloc-odr1-16    224.00 (  0.00%)           218.00 (  2.68%)
  Min      alloc-odr1-32    210.00 (  0.00%)           208.00 (  0.95%)
  Min      alloc-odr1-64    207.00 (  0.00%)           203.00 (  1.93%)
  Min      alloc-odr1-128   276.00 (  0.00%)           202.00 ( 26.81%)
  Min      alloc-odr1-256   206.00 (  0.00%)           202.00 (  1.94%)
  Min      alloc-odr1-512   207.00 (  0.00%)           202.00 (  2.42%)
  Min      alloc-odr1-1024  208.00 (  0.00%)           205.00 (  1.44%)
  Min      alloc-odr1-2048  213.00 (  0.00%)           212.00 (  0.47%)
  Min      alloc-odr1-4096  218.00 (  0.00%)           216.00 (  0.92%)
  Min      alloc-odr1-8192  341.00 (  0.00%)           219.00 ( 35.78%)

Note that order-0 allocations are unaffected but higher orders get a
small boost from this patch and a large reduction in system CPU usage
overall as can be seen here:

             4.7.0-rc1   4.7.0-rc1
               vanilla  reset-v1r2
  User           85.32       86.31
  System       2221.39     2053.36
  Elapsed      2368.89     2202.47

Fixes: c33d6c06f60f ("mm, page_alloc: avoid looking up the first zone in a zonelist twice")
Link: http://lkml.kernel.org/r/20160531100848.GR2527@techsingularity.net
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Tested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Tested-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agomm, oom_reaper: do not use siglock in try_oom_reaper()
Michal Hocko [Fri, 3 Jun 2016 21:55:55 +0000 (14:55 -0700)]
mm, oom_reaper: do not use siglock in try_oom_reaper()

Oleg has noted that siglock usage in try_oom_reaper is both pointless
and dangerous.  signal_group_exit can be checked lockless.  The problem
is that sighand becomes NULL in __exit_signal so we can crash.

Fixes: 3ef22dfff239 ("oom, oom_reaper: try to reap tasks which skip regular OOM killer path")
Link: http://lkml.kernel.org/r/1464679423-30218-1-git-send-email-mhocko@kernel.org
Signed-off-by: Michal Hocko <mhocko@suse.com>
Suggested-by: Oleg Nesterov <oleg@redhat.com>
Cc: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agomm, page_alloc: prevent infinite loop in buffered_rmqueue()
Vlastimil Babka [Fri, 3 Jun 2016 21:55:52 +0000 (14:55 -0700)]
mm, page_alloc: prevent infinite loop in buffered_rmqueue()

In DEBUG_VM kernel, we can hit infinite loop for order == 0 in
buffered_rmqueue() when check_new_pcp() returns 1, because the bad page
is never removed from the pcp list.  Fix this by removing the page
before retrying.  Also we don't need to check if page is non-NULL,
because we simply grab it from the list which was just tested for being
non-empty.

Fixes: 479f854a207c ("mm, page_alloc: defer debugging checks of pages allocated from the PCP")
Link: http://lkml.kernel.org/r/20160530090154.GM2527@techsingularity.net
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Reported-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agocheckpatch: reduce git commit description style false positives
Joe Perches [Fri, 3 Jun 2016 21:55:49 +0000 (14:55 -0700)]
checkpatch: reduce git commit description style false positives

Some lines in a commit log appear to be commit SHA1 ids like:

  ERROR: Please use git commit description style 'commit <12+ chars of sha1> ("<title line>")' - ie: 'commit 0123456789ab ("commit description")'
Link: http://lkml.kernel.org/r/40e03fd7aaf1f55c75d787128d6d17c5a71226c2.1464358556.git.vdavydov@virtuozzo.com
Reduce the false positives.

Link: http://lkml.kernel.org/r/eda977eaa8328fef42bb3c87935d97e10ea8ff67.1464384023.git.joe@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Reported-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agomm/z3fold.c: avoid modifying HEADLESS page and minor cleanup
Vitaly Wool [Fri, 3 Jun 2016 21:55:47 +0000 (14:55 -0700)]
mm/z3fold.c: avoid modifying HEADLESS page and minor cleanup

Fix erroneous z3fold header access in a HEADLESS page in reclaim
function, and change one remaining direct handle-to-buddy conversion to
use the appropriate helper.

Link: http://lkml.kernel.org/r/5748706F.9020208@gmail.com
Signed-off-by: Vitaly Wool <vitalywool@gmail.com>
Reviewed-by: Dan Streetman <ddstreet@ieee.org>
Cc: Seth Jennings <sjenning@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agomemcg: add RCU locking around css_for_each_descendant_pre() in memcg_offline_kmem()
Tejun Heo [Fri, 3 Jun 2016 21:55:44 +0000 (14:55 -0700)]
memcg: add RCU locking around css_for_each_descendant_pre() in memcg_offline_kmem()

memcg_offline_kmem() may be called from memcg_free_kmem() after a css
init failure.  memcg_free_kmem() is a ->css_free callback which is
called without cgroup_mutex and memcg_offline_kmem() ends up using
css_for_each_descendant_pre() without any locking.  Fix it by adding rcu
read locking around it.

    mkdir: cannot create directory `65530': No space left on device
    ===============================
    [ INFO: suspicious RCU usage. ]
    4.6.0-work+ #321 Not tainted
    -------------------------------
    kernel/cgroup.c:4008 cgroup_mutex or RCU read lock required!
     [  527.243970] other info that might help us debug this:
     [  527.244715]
    rcu_scheduler_active = 1, debug_locks = 0
    2 locks held by kworker/0:5/1664:
     #0:  ("cgroup_destroy"){.+.+..}, at: [<ffffffff81060ab5>] process_one_work+0x165/0x4a0
     #1:  ((&css->destroy_work)#3){+.+...}, at: [<ffffffff81060ab5>] process_one_work+0x165/0x4a0
     [  527.248098] stack backtrace:
    CPU: 0 PID: 1664 Comm: kworker/0:5 Not tainted 4.6.0-work+ #321
    Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-1.fc24 04/01/2014
    Workqueue: cgroup_destroy css_free_work_fn
    Call Trace:
      dump_stack+0x68/0xa1
      lockdep_rcu_suspicious+0xd7/0x110
      css_next_descendant_pre+0x7d/0xb0
      memcg_offline_kmem.part.44+0x4a/0xc0
      mem_cgroup_css_free+0x1ec/0x200
      css_free_work_fn+0x49/0x5e0
      process_one_work+0x1c5/0x4a0
      worker_thread+0x49/0x490
      kthread+0xea/0x100
      ret_from_fork+0x1f/0x40

Link: http://lkml.kernel.org/r/20160526203018.GG23194@mtj.duckdns.org
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: <stable@vger.kernel.org> [4.5+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agoMerge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Fri, 3 Jun 2016 22:37:27 +0000 (15:37 -0700)]
Merge branch 'timers-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull timer bugfix from Thomas Gleixner:
 "A single bugfix for the error check wreckage we introduced in the
  merge window"

* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  time: Make settimeofday error checking work again

8 years agomm: check the return value of lookup_page_ext for all call sites
Yang Shi [Fri, 3 Jun 2016 21:55:38 +0000 (14:55 -0700)]
mm: check the return value of lookup_page_ext for all call sites

Per the discussion with Joonsoo Kim [1], we need check the return value
of lookup_page_ext() for all call sites since it might return NULL in
some cases, although it is unlikely, i.e.  memory hotplug.

Tested with ltp with "page_owner=0".

[1] http://lkml.kernel.org/r/20160519002809.GA10245@js1304-P5Q-DELUXE

[akpm@linux-foundation.org: fix build-breaking typos]
[arnd@arndb.de: fix build problems from lookup_page_ext]
Link: http://lkml.kernel.org/r/6285269.2CksypHdYp@wuerfel
[akpm@linux-foundation.org: coding-style fixes]
Link: http://lkml.kernel.org/r/1464023768-31025-1-git-send-email-yang.shi@linaro.org
Signed-off-by: Yang Shi <yang.shi@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agokdump: fix dmesg gdbmacro to work with record based printk
Corey Minyard [Fri, 3 Jun 2016 21:55:36 +0000 (14:55 -0700)]
kdump: fix dmesg gdbmacro to work with record based printk

Commit 7ff9554bb578 ("printk: convert byte-buffer to variable-length
record buffer") introduced a record based printk buffer.  Modify
gdbmacros.txt to parse this new structure so dmesg will work properly.

Link: http://lkml.kernel.org/r/1463515794-1599-1-git-send-email-minyard@acm.org
Signed-off-by: Corey Minyard <cminyard@mvista.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agomm: fix overflow in vm_map_ram()
Guillermo Julián Moreno [Fri, 3 Jun 2016 21:55:33 +0000 (14:55 -0700)]
mm: fix overflow in vm_map_ram()

When remapping pages accounting for 4G or more memory space, the
operation 'count << PAGE_SHIFT' overflows as it is performed on an
integer.  Solution: cast before doing the bitshift.

[akpm@linux-foundation.org: fix vm_unmap_ram() also]
[akpm@linux-foundation.org: fix vmap() as well, per Guillermo]
Link: http://lkml.kernel.org/r/etPan.57175fb3.7a271c6b.2bd@naudit.es
Signed-off-by: Guillermo Julián Moreno <guillermo.julian@naudit.es>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agoMerge branch 'fixes' of git://git.armlinux.org.uk/~rmk/linux-arm
Linus Torvalds [Fri, 3 Jun 2016 21:39:29 +0000 (14:39 -0700)]
Merge branch 'fixes' of git://git.armlinux.org.uk/~rmk/linux-arm

Pull ARM fix from Russell King:
 "Just one fix to the ptrace code, spotted by Simon Marchi, where if a
  thread migrates to a different CPU and the VFP registers are changed
  through ptrace, the application doesn't see the updated VFP registers"

* 'fixes' of git://git.armlinux.org.uk/~rmk/linux-arm:
  ARM: fix PTRACE_SETVFPREGS on SMP systems

8 years agoMerge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
Linus Torvalds [Fri, 3 Jun 2016 21:29:47 +0000 (14:29 -0700)]
Merge tag 'arm64-fixes' of git://git./linux/kernel/git/arm64/linux

Pull arm64 fixes from Will Deacon:
 "The main thing here is reviving hugetlb support using contiguous ptes,
  which we ended up reverting at the last minute in 4.5 pending a fix
  which went into the core mm/ code during the recent merge window.

   - Revert a previous revert and get hugetlb going with contiguous hints
   - Wire up missing compat syscalls
   - Enable CONFIG_SET_MODULE_RONX by default
   - Add missing line to our compat /proc/cpuinfo output
   - Clarify levels in our page table dumps
   - Fix booting with RANDOMIZE_TEXT_OFFSET enabled
   - Misc fixes to the ARM CPU PMU driver (refcounting, probe failure)
   - Remove some dead code and update a comment"

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: fix alignment when RANDOMIZE_TEXT_OFFSET is enabled
  arm64: move {PAGE,CONT}_SHIFT into Kconfig
  arm64: mm: dump: log span level
  arm64: update stale PAGE_OFFSET comment
  drivers/perf: arm_pmu: Avoid leaking pmu->irq_affinity on error
  drivers/perf: arm_pmu: Defer the setting of __oprofile_cpu_pmu
  drivers/perf: arm_pmu: Fix reference count of a device_node in of_pmu_irq_cfg
  arm64: report CPU number in bad_mode
  arm64: unistd32.h: wire up missing syscalls for compat tasks
  arm64: Provide "model name" in /proc/cpuinfo for PER_LINUX32 tasks
  arm64: enable CONFIG_SET_MODULE_RONX by default
  arm64: Remove orphaned __addr_ok() definition
  Revert "arm64: hugetlb: partial revert of 66b3923a1a0f"

8 years agoMerge tag 'powerpc-4.7-2' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc...
Linus Torvalds [Fri, 3 Jun 2016 21:20:22 +0000 (14:20 -0700)]
Merge tag 'powerpc-4.7-2' of git://git./linux/kernel/git/powerpc/linux

Pull powerpc fixes from Michael Ellerman:
 - Handle RTAS delay requests in configure_bridge from Russell Currey
 - Refactor the configure_bridge RTAS tokens from Russell Currey
 - Fix definition of SIAR and SDAR registers from Thomas Huth
 - Use privileged SPR number for MMCR2 from Thomas Huth
 - Update LPCR only if it is powernv from Aneesh Kumar K.V
 - Fix the reference bit update when handling hash fault from Aneesh
   Kumar K.V
 - Add missing tlb flush from Aneesh Kumar K.V
 - Add POWER8NVL support to ibm,client-architecture-support call from
   Thomas Huth

* tag 'powerpc-4.7-2' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/pseries: Add POWER8NVL support to ibm,client-architecture-support call
  powerpc/mm/radix: Add missing tlb flush
  powerpc/mm/hash: Fix the reference bit update when handling hash fault
  powerpc/mm/radix: Update LPCR only if it is powernv
  powerpc: Use privileged SPR number for MMCR2
  powerpc: Fix definition of SIAR and SDAR registers
  powerpc/pseries/eeh: Refactor the configure_bridge RTAS tokens
  powerpc/pseries/eeh: Handle RTAS delay requests in configure_bridge

8 years agoMerge branches 'acpica-fixes', 'acpi-video' and 'acpi-processor'
Rafael J. Wysocki [Fri, 3 Jun 2016 20:35:05 +0000 (22:35 +0200)]
Merge branches 'acpica-fixes', 'acpi-video' and 'acpi-processor'

* acpica-fixes:
  ACPICA / Hardware: Fix old register check in acpi_hw_get_access_bit_width()

* acpi-video:
  ACPI / Thermal / video: fix max_level incorrect value

* acpi-processor:
  ACPI / processor: Avoid reserving IO regions too early

8 years agoMerge branch 'pm-cpufreq-fixes'
Rafael J. Wysocki [Fri, 3 Jun 2016 20:34:18 +0000 (22:34 +0200)]
Merge branch 'pm-cpufreq-fixes'

* pm-cpufreq-fixes:
  cpufreq: Fix clamp_val() usage in cpufreq_driver_fast_switch()
  cpufreq: intel_pstate: Downgrade print level for _PPC

8 years agoBtrfs: deal with duplciates during extent_map insertion in btrfs_get_extent
Chris Mason [Sat, 19 Sep 2015 18:28:25 +0000 (11:28 -0700)]
Btrfs: deal with duplciates during extent_map insertion in btrfs_get_extent

When dealing with inline extents, btrfs_get_extent will incorrectly try
to insert a duplicate extent_map.  The dup hits -EEXIST from
add_extent_map, but then we try to merge with the existing one and end
up trying to insert a zero length extent_map.

This actually works most of the time, except when there are extent maps
past the end of the inline extent.  rocksdb will trigger this sometimes
because it preallocates an extent and then truncates down.

Josef made a script to trigger with xfs_io:

#!/bin/bash

xfs_io -f -c "pwrite 0 1000" inline
xfs_io -c "falloc -k 4k 1M" inline
xfs_io -c "pread 0 1000" -c "fadvise -d 0 1000" -c "pread 0 1000" inline
xfs_io -c "fadvise -d 0 1000" inline
cat inline

You'll get EIOs trying to read inline after this because add_extent_map
is returning EEXIST

Signed-off-by: Chris Mason <clm@fb.com>
8 years agoMerge tag 'irqchip-4.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/maz...
Thomas Gleixner [Fri, 3 Jun 2016 13:05:51 +0000 (15:05 +0200)]
Merge tag 'irqchip-4.7-rc1' of git://git./linux/kernel/git/maz/arm-platforms into irq/urgent

Merge irqchip updates from Marc Zyngier:

- A number of embarassing buglets (GICv3, PIC32)
- A more substential errata workaround for Cavium's GICv3 ITS
  (kept for post-rc1 due to its dependency on NUMA)

8 years agoarm64: fix alignment when RANDOMIZE_TEXT_OFFSET is enabled
Mark Rutland [Tue, 31 May 2016 14:58:00 +0000 (15:58 +0100)]
arm64: fix alignment when RANDOMIZE_TEXT_OFFSET is enabled

With ARM64_64K_PAGES and RANDOMIZE_TEXT_OFFSET enabled, we hit the
following issue on the boot:

kernel BUG at arch/arm64/mm/mmu.c:480!
Internal error: Oops - BUG: 0 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 0 Comm: swapper Not tainted 4.6.0 #310
Hardware name: ARM Juno development board (r2) (DT)
task: ffff000008d58a80 ti: ffff000008d30000 task.ti: ffff000008d30000
PC is at map_kernel_segment+0x44/0xb0
LR is at paging_init+0x84/0x5b0
pc : [<ffff000008c450b4>] lr : [<ffff000008c451a4>] pstate: 600002c5

Call trace:
[<ffff000008c450b4>] map_kernel_segment+0x44/0xb0
[<ffff000008c451a4>] paging_init+0x84/0x5b0
[<ffff000008c42728>] setup_arch+0x198/0x534
[<ffff000008c40848>] start_kernel+0x70/0x388
[<ffff000008c401bc>] __primary_switched+0x30/0x74

Commit 7eb90f2ff7e3 ("arm64: cover the .head.text section in the .text
segment mapping") removed the alignment between the .head.text and .text
sections, and used the _text rather than the _stext interval for mapping
the .text segment.

Prior to this commit _stext was always section aligned and didn't cause
any issue even when RANDOMIZE_TEXT_OFFSET was enabled. Since that
alignment has been removed and _text is used to map the .text segment,
we need ensure _text is always page aligned when RANDOMIZE_TEXT_OFFSET
is enabled.

This patch adds logic to TEXT_OFFSET fuzzing to ensure that the offset
is always aligned to the kernel page size. To ensure this, we rely on
the PAGE_SHIFT being available via Kconfig.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reported-by: Sudeep Holla <sudeep.holla@arm.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Fixes: 7eb90f2ff7e3 ("arm64: cover the .head.text section in the .text segment mapping")
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: move {PAGE,CONT}_SHIFT into Kconfig
Mark Rutland [Tue, 31 May 2016 14:57:59 +0000 (15:57 +0100)]
arm64: move {PAGE,CONT}_SHIFT into Kconfig

In some cases (e.g. the awk for CONFIG_RANDOMIZE_TEXT_OFFSET) we would
like to make use of PAGE_SHIFT outside of code that can include the
usual header files.

Add a new CONFIG_ARM64_PAGE_SHIFT for this, likewise with
ARM64_CONT_SHIFT for consistency.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Sudeep Holla <sudeep.holla@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: mm: dump: log span level
Mark Rutland [Tue, 31 May 2016 13:49:02 +0000 (14:49 +0100)]
arm64: mm: dump: log span level

The page table dump code logs spans of entries at the same level
(pgd/pud/pmd/pte) which have the same attributes. While we log the
(decoded) attributes, we don't log the level, which leaves the output
ambiguous and/or confusing in some cases.

For example:

0xffff800800000000-0xffff800980000000           6G       RW NX SHD AF        BLK UXN MEM/NORMAL

If using 4K pages, this may describe a span of 6 1G block entries at the
PGD/PUD level, or 3072 2M block entries at the PMD level.

This patch adds the page table level to each output line, removing this
ambiguity. For the example above, this will produce:

0xffffffc800000000-0xffffffc980000000           6G PUD       RW NX SHD AF        BLK UXN MEM/NORMAL

When 3 level tables are in use, and we use the asm-generic/nopud.h
definitions, the dump code treats each entry in the PGD as a 1 element
table at the PUD level, and logs spans as being PUDs, which can be
confusing. To counteract this, the "PUD" mnemonic is replaced with "PGD"
when CONFIG_PGTABLE_LEVELS <= 3. Likewise for "PMD" when
CONFIG_PGTABLE_LEVELS <= 2.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Huang Shijie <shijie.huang@arm.com>
Cc: Laura Abbott <labbott@fedoraproject.org>
Cc: Steve Capper <steve.capper@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: update stale PAGE_OFFSET comment
Mark Rutland [Wed, 1 Jun 2016 11:07:17 +0000 (12:07 +0100)]
arm64: update stale PAGE_OFFSET comment

Commit ab893fb9f1b17f02 ("arm64: introduce KIMAGE_VADDR as the virtual
base of the kernel region") logically split KIMAGE_VADDR from
PAGE_OFFSET, and since commit f9040773b7bbbd9e ("arm64: move kernel
image to base of vmalloc area") the two have been distinct values.

Unfortunately, neither commit updated the comment above these
definitions, which now erroneously states that PAGE_OFFSET is the start
of the kernel image rather than the start of the linear mapping.

This patch fixes said comment, and introduces an explanation of
KIMAGE_VADDR.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agodrivers/perf: arm_pmu: Avoid leaking pmu->irq_affinity on error
Julien Grall [Tue, 31 May 2016 11:41:23 +0000 (12:41 +0100)]
drivers/perf: arm_pmu: Avoid leaking pmu->irq_affinity on error

pmu->irq_affinity will not be freed if an error occurred within
arm_pmu_device_probe after of_pmu_irq_cfg has been called.

Note that in the case of_pmu_irq_cfg is returning an error,
pmu->irq_affinity will not be set, but it should be NULL as pmu was
kzalloc'd. Therefore the result kfree(NULL) is benign.

Signed-off-by: Julien Grall <julien.grall@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agodrivers/perf: arm_pmu: Defer the setting of __oprofile_cpu_pmu
Julien Grall [Tue, 31 May 2016 11:41:22 +0000 (12:41 +0100)]
drivers/perf: arm_pmu: Defer the setting of __oprofile_cpu_pmu

The global variable __oprofile_cpu_pmu is set before the PMU is fully
initialized. If an error occurs before the end of the initialization,
the PMU will be freed and the variable will contain an invalid pointer.

This will result in a kernel crash when perf will be used.

Fix it by moving the setting of __oprofile_cpu_pmu when the PMU is fully
initialized (i.e when it is no longer possible to fail).

Cc: <stable@vger.kernel.org>
Signed-off-by: Julien Grall <julien.grall@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agodrivers/perf: arm_pmu: Fix reference count of a device_node in of_pmu_irq_cfg
Julien Grall [Tue, 31 May 2016 11:41:21 +0000 (12:41 +0100)]
drivers/perf: arm_pmu: Fix reference count of a device_node in of_pmu_irq_cfg

The only function called by of_pmu_irq_cfg that will increment the
reference count on dn is of_parse_phandle.

Each time we successfully parse a possible CPU from an
interrupt-affinity property, we increment the refcount of that CPU node
once via of_parse_handle. After validating the CPU is possible, we
decrement the refcount once. Subsequently, we decrement the refcount
again, either as part of an early break if we don't have a matching SPI,
or as part of the end of the loop body.

This will lead to decrementing twice the refcounnt.
Remove the second pairs of call to of_node_put as nobody is using dn
between the first and second call to of_node_put.

Signed-off-by: Julien Grall <julien.grall@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: report CPU number in bad_mode
Mark Rutland [Tue, 31 May 2016 11:07:47 +0000 (12:07 +0100)]
arm64: report CPU number in bad_mode

If we take an exception we don't expect (e.g. SError), we report this in
the bad_mode handler with pr_crit. Depending on the configured log
level, we may or may not log additional information in functions called
subsequently. Notably, the messages in dump_stack (including the CPU
number) are printed with KERN_DEFAULT and may not appear.

Some exceptions have an IMPLEMENTATION DEFINED ESR_ELx.ISS encoding, and
knowing the CPU number is crucial to correctly decode them. To ensure
that this is always possible, we should log the CPU number along with
the ESR_ELx value, so we are not reliant on subsequent logs or
additional printk configuration options.

This patch logs the CPU number in bad_mode such that it is possible for
a developer to decode these exceptions, provided access to sufficient
documentation.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reported-by: Al Grant <Al.Grant@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dave Martin <dave.martin@arm.com>
Cc: Robin Murphy <robin.murphy@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoKEYS: Add placeholder for KDF usage with DH
Stephan Mueller [Thu, 26 May 2016 21:38:12 +0000 (23:38 +0200)]
KEYS: Add placeholder for KDF usage with DH

The values computed during Diffie-Hellman key exchange are often used
in combination with key derivation functions to create cryptographic
keys.  Add a placeholder for a later implementation to configure a
key derivation function that will transform the Diffie-Hellman
result returned by the KEYCTL_DH_COMPUTE command.

[This patch was stripped down from a patch produced by Mat Martineau that
 had a bug in the compat code - so for the moment Stephan's patch simply
 requires that the placeholder argument must be NULL]

Original-signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
8 years agodrm/omap: fix unused variable warning.
Dave Airlie [Fri, 3 Jun 2016 04:39:41 +0000 (14:39 +1000)]
drm/omap: fix unused variable warning.

Signed-off-by: Dave Airlie <airlied@redhat.com>
8 years agoMerge tag 'omapdrm-4.7-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tomba...
Dave Airlie [Fri, 3 Jun 2016 04:35:00 +0000 (14:35 +1000)]
Merge tag 'omapdrm-4.7-fixes' of git://git./linux/kernel/git/tomba/linux into drm-fixes

omapdrm fixes for 4.7

* multiple compile break fixes for missing includes, bad kconfig dependencies.
* remove regulator API misuse causing deprecation warnings
* OMAP5 HDMI fixes for DDC and AVI infoframe
* OMAP4 HDMI fix for CEC

* tag 'omapdrm-4.7-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tomba/linux:
  drm/omap: include gpio/consumer.h where needed
  drm/omap: include linux/seq_file.h where needed
  Revert "drm/omap: no need to select OMAP2_DSS"
  drm/omap: Remove regulator API abuse
  OMAPDSS: HDMI5: Change DDC timings
  OMAPDSS: HDMI5: Fix AVI infoframe
  drm/omap: fix OMAP4 hdmi_core_powerdown_disable()
  drm/omap: Fix missing includes
  drm/omapdrm: include pinctrl/consumer.h where needed

8 years agoMerge tag 'imx-drm-next-2016-06-01' of git://git.pengutronix.de/git/pza/linux into...
Dave Airlie [Fri, 3 Jun 2016 04:11:49 +0000 (14:11 +1000)]
Merge tag 'imx-drm-next-2016-06-01' of git://git.pengutronix.de/git/pza/linux into drm-fixes

imx-drm updates

- add support for reading LVDS panel EDID over DDC
- enable UYVY/VYUY support
- add support for pixel clock polarity configuration
- honor the native-mode DT property for LVDS
- various fixes and cleanups

* tag 'imx-drm-next-2016-06-01' of git://git.pengutronix.de/git/pza/linux:
  drm/imx: plane: Don't set plane->crtc in ipu_plane_update()
  drm/imx: ipuv3-plane: Constify ipu_plane_funcs
  drm/imx: imx-ldb: honor 'native-mode' property when selecting video mode from DT
  drm/imx: parallel-display: remove dead code
  drm/imx: use bus_flags for pixel clock polarity
  drm/imx: ipuv3-plane: enable UYVY and VYUY formats
  drm/imx: parallel-display: use of_graph_get_endpoint_by_regs helper
  drm/imx: imx-ldb: use of_graph_get_endpoint_by_regs helper
  dt-bindings: imx: ldb: Add ddc-i2c-bus property
  drm/imx: imx-ldb: Add DDC support

8 years agoMerge tag 'drm-atmel-hlcdc-fixes/for-4.7-rc2' of github.com:bbrezillon/linux-at91...
Dave Airlie [Fri, 3 Jun 2016 04:08:20 +0000 (14:08 +1000)]
Merge tag 'drm-atmel-hlcdc-fixes/for-4.7-rc2' of github.com:bbrezillon/linux-at91 into drm-fixes

Two trivial bugfixes for the atmel-hlcdc driver.

The first one is making use of __drm_atomic_helper_crtc_destroy_state()
instead of duplicating its logic in atmel_hlcdc_crtc_reset() and
risking memory leaks if other objects are added to the common CRTC
state.

The second one is fixing a possible NULL pointer dereference.

* tag 'drm-atmel-hlcdc-fixes/for-4.7-rc2' of github.com:bbrezillon/linux-at91:
  drm: atmel-hlcdc: fix a NULL check
  drm: atmel-hlcdc: fix atmel_hlcdc_crtc_reset() implementation

8 years agoMerge branch 'for-upstream/hdlcd' of git://linux-arm.org/linux-ld into drm-fixes
Dave Airlie [Fri, 3 Jun 2016 04:07:42 +0000 (14:07 +1000)]
Merge branch 'for-upstream/hdlcd' of git://linux-arm.org/linux-ld into drm-fixes

"I have accumulated some cleanup patches for HDLCD, partly triggered by
Daniel Vetter's work on non-blocking atomic operations, that I would like
to integrate into v4.7. My first patch is important for the newly enabled
hibernate option for AArch64 on Juno, the others are fixing behaviour in
HDLCD and adding a debugfs entry to help track the underlying framebuffer
usage. I'm also taking one of Daniel's patches from his non-blocking series
to help with the integration of his patches later."

* 'for-upstream/hdlcd' of git://linux-arm.org/linux-ld:
  drm: hdlcd: Add information about the underlying framebuffers in debugfs
  drm: hdlcd: Cleanup the atomic plane operations
  drm/hdlcd: Fix up crtc_state->event handling
  drm: hdlcd: Revamp runtime power management

8 years agoMerge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Linus Torvalds [Thu, 2 Jun 2016 22:08:06 +0000 (15:08 -0700)]
Merge tag 'for-linus' of git://git./virt/kvm/kvm

Pull KVM fixes from Radim Krčmář:
 "ARM:
   - two fixes for 4.6 vgic [Christoffer] (cc stable)

   - six fixes for 4.7 vgic [Marc]

  x86:
   - six fixes from syzkaller reports [Paolo] (two of them cc stable)

   - allow OS X to boot [Dmitry]

   - don't trust compilers [Nadav]"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  KVM: x86: fix OOPS after invalid KVM_SET_DEBUGREGS
  KVM: x86: avoid vmalloc(0) in the KVM_SET_CPUID
  KVM: irqfd: fix NULL pointer dereference in kvm_irq_map_gsi
  KVM: fail KVM_SET_VCPU_EVENTS with invalid exception number
  KVM: x86: avoid vmalloc(0) in the KVM_SET_CPUID
  kvm: x86: avoid warning on repeated KVM_SET_TSS_ADDR
  KVM: Handle MSR_IA32_PERF_CTL
  KVM: x86: avoid write-tearing of TDP
  KVM: arm/arm64: vgic-new: Removel harmful BUG_ON
  arm64: KVM: vgic-v3: Relax synchronization when SRE==1
  arm64: KVM: vgic-v3: Prevent the guest from messing with ICC_SRE_EL1
  arm64: KVM: Make ICC_SRE_EL1 access return the configured SRE value
  KVM: arm/arm64: vgic-v3: Always resample level interrupts
  KVM: arm/arm64: vgic-v2: Always resample level interrupts
  KVM: arm/arm64: vgic-v3: Clear all dirty LRs
  KVM: arm/arm64: vgic-v2: Clear all dirty LRs

8 years agoirqchip/irq-pic32-evic: Fix bug with external interrupts.
Joshua Henderson [Tue, 17 May 2016 05:05:53 +0000 (10:35 +0530)]
irqchip/irq-pic32-evic: Fix bug with external interrupts.

The wrong external interrupt bits are being set, offset by 1.

Signed-off-by: Joshua Henderson <digitalpeer@digitalpeer.com>
Signed-off-by: Purna Chandra Mandal <purna.mandal@microchip.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
8 years agoirqchip/gicv3-its: numa: Enable workaround for Cavium thunderx erratum 23144
Ganapatrao Kulkarni [Wed, 25 May 2016 13:29:20 +0000 (15:29 +0200)]
irqchip/gicv3-its: numa: Enable workaround for Cavium thunderx erratum 23144

The erratum fixes the hang of ITS SYNC command by avoiding inter node
io and collections/cpu mapping on thunderx dual-socket platform.

This fix is only applicable for Cavium's ThunderX dual-socket platform.

Reviewed-by: Robert Richter <rrichter@cavium.com>
Signed-off-by: Ganapatrao Kulkarni <gkulkarni@caviumnetworks.com>
Signed-off-by: Robert Richter <rrichter@cavium.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
8 years agoirqchip/gic-v3: Fix quiescence check in gic_enable_redist
Andrew Jones [Wed, 11 May 2016 19:23:17 +0000 (21:23 +0200)]
irqchip/gic-v3: Fix quiescence check in gic_enable_redist

Make sure the two sides of the bitwise operation are bool.

Signed-off-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
8 years agoirqchip/gic-v3: Fix copy+paste mistakes in defines
Andrew Jones [Thu, 12 May 2016 08:46:34 +0000 (10:46 +0200)]
irqchip/gic-v3: Fix copy+paste mistakes in defines

ICC_SGI1R_AFFINITY_{2,3}_MASK are unused, which is good
because they were defined with the wrong shifts.

Signed-off-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
8 years agoirqchip/gic-v3: Fix ICC_SGI1R_EL1.INTID decoding mask
Marc Zyngier [Thu, 2 Jun 2016 08:00:28 +0000 (09:00 +0100)]
irqchip/gic-v3: Fix ICC_SGI1R_EL1.INTID decoding mask

The INTID mask is wrong, and is made a signed value, which has
nteresting effects in the KVM emulation. Let's sanitize it.

Cc: stable@vger.kernel.org
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
8 years agodrm: hdlcd: Add information about the underlying framebuffers in debugfs
Liviu Dudau [Wed, 1 Jun 2016 14:07:02 +0000 (15:07 +0100)]
drm: hdlcd: Add information about the underlying framebuffers in debugfs

drm_fb_cma code has a nice helper function to display in the debugfs
information about the underlying framebuffers used by HDLCD:

$ cat /sys/kernel/debug/dri/0/fb
fb: 1920x1200@XR24
   0: offset=0 pitch=7680, obj:  0 ( 2) 001011ba 0x00000000fc300000 ffffff800a27c000 9338880
fb: 1920x1200@XR24
   0: offset=0 pitch=7680, obj:  0 ( 2) 001008ca 0x00000000fba00000 ffffff8009987000 9338880
fb: 1920x1200@XR24
   0: offset=0 pitch=7680, obj:  0 ( 1) 00100000 0x00000000fb100000 ffffff8008fdc000 9216000

Add the entry in HDLCD's debugfs node.

Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com>
8 years agodrm: hdlcd: Cleanup the atomic plane operations
Liviu Dudau [Wed, 1 Jun 2016 14:00:15 +0000 (15:00 +0100)]
drm: hdlcd: Cleanup the atomic plane operations

Harden the plane_check() code to drop attempts at scaling because
that is not supported. Make hdlcd_plane_atomic_update() set the pitch
and line length registers that correctly reflect the plane's values.
And make hdlcd_crtc_mode_set_nofb() a helper function for
hdlcd_crtc_enable() rather than an exposed hook.

Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com>
8 years agodrm/hdlcd: Fix up crtc_state->event handling
Daniel Vetter [Tue, 31 May 2016 16:21:13 +0000 (18:21 +0200)]
drm/hdlcd: Fix up crtc_state->event handling

event_list just reimplemented what drm_crtc_arm_vblank_event does. And
we also need to send out drm events when shutting down a pipe.

With this it's possible to use the new nonblocking commit support in
the helpers.

Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Acked-by: Liviu Dudau <Liviu.Dudau@arm.com>
8 years agodrm: hdlcd: Revamp runtime power management
Liviu Dudau [Tue, 17 May 2016 09:06:54 +0000 (10:06 +0100)]
drm: hdlcd: Revamp runtime power management

Because the HDLCD driver acts as a component master it can end
up enabling the runtime PM functionality before the encoders
are initialised. This can cause crashes if the component slave
never probes (missing module) or if the PM operations kick in
before the probe finishes.

Move the enabling of the runtime PM after the component master
has finished collecting the slave components and use the DRM
atomic helpers to suspend and resume the device.

Tested-by: Robin Murphy <Robin.Murphy@arm.com>
Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com>
8 years agoKVM: x86: fix OOPS after invalid KVM_SET_DEBUGREGS
Paolo Bonzini [Wed, 1 Jun 2016 12:09:23 +0000 (14:09 +0200)]
KVM: x86: fix OOPS after invalid KVM_SET_DEBUGREGS

MOV to DR6 or DR7 causes a #GP if an attempt is made to write a 1 to
any of bits 63:32.  However, this is not detected at KVM_SET_DEBUGREGS
time, and the next KVM_RUN oopses:

   general protection fault: 0000 [#1] SMP
   CPU: 2 PID: 14987 Comm: a.out Not tainted 4.4.9-300.fc23.x86_64 #1
   Hardware name: LENOVO 2325F51/2325F51, BIOS G2ET32WW (1.12 ) 05/30/2012
   [...]
   Call Trace:
    [<ffffffffa072c93d>] kvm_arch_vcpu_ioctl_run+0x141d/0x14e0 [kvm]
    [<ffffffffa071405d>] kvm_vcpu_ioctl+0x33d/0x620 [kvm]
    [<ffffffff81241648>] do_vfs_ioctl+0x298/0x480
    [<ffffffff812418a9>] SyS_ioctl+0x79/0x90
    [<ffffffff817a0f2e>] entry_SYSCALL_64_fastpath+0x12/0x71
   Code: 55 83 ff 07 48 89 e5 77 27 89 ff ff 24 fd 90 87 80 81 0f 23 fe 5d c3 0f 23 c6 5d c3 0f 23 ce 5d c3 0f 23 d6 5d c3 0f 23 de 5d c3 <0f> 23 f6 5d c3 0f 0b 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00
   RIP  [<ffffffff810639eb>] native_set_debugreg+0x2b/0x40
    RSP <ffff88005836bd50>

Testcase (beautified/reduced from syzkaller output):

    #include <unistd.h>
    #include <sys/syscall.h>
    #include <string.h>
    #include <stdint.h>
    #include <linux/kvm.h>
    #include <fcntl.h>
    #include <sys/ioctl.h>

    long r[8];

    int main()
    {
        struct kvm_debugregs dr = { 0 };

        r[2] = open("/dev/kvm", O_RDONLY);
        r[3] = ioctl(r[2], KVM_CREATE_VM, 0);
        r[4] = ioctl(r[3], KVM_CREATE_VCPU, 7);

        memcpy(&dr,
               "\x5d\x6a\x6b\xe8\x57\x3b\x4b\x7e\xcf\x0d\xa1\x72"
               "\xa3\x4a\x29\x0c\xfc\x6d\x44\x00\xa7\x52\xc7\xd8"
               "\x00\xdb\x89\x9d\x78\xb5\x54\x6b\x6b\x13\x1c\xe9"
               "\x5e\xd3\x0e\x40\x6f\xb4\x66\xf7\x5b\xe3\x36\xcb",
               48);
        r[7] = ioctl(r[4], KVM_SET_DEBUGREGS, &dr);
        r[6] = ioctl(r[4], KVM_RUN, 0);
    }

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
8 years agoKVM: x86: avoid vmalloc(0) in the KVM_SET_CPUID
Paolo Bonzini [Wed, 1 Jun 2016 12:09:22 +0000 (14:09 +0200)]
KVM: x86: avoid vmalloc(0) in the KVM_SET_CPUID

This causes an ugly dmesg splat.  Beautified syzkaller testcase:

    #include <unistd.h>
    #include <sys/syscall.h>
    #include <sys/ioctl.h>
    #include <fcntl.h>
    #include <linux/kvm.h>

    long r[8];

    int main()
    {
        struct kvm_irq_routing ir = { 0 };
        r[2] = open("/dev/kvm", O_RDWR);
        r[3] = ioctl(r[2], KVM_CREATE_VM, 0);
        r[4] = ioctl(r[3], KVM_SET_GSI_ROUTING, &ir);
        return 0;
    }

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
8 years agoKVM: irqfd: fix NULL pointer dereference in kvm_irq_map_gsi
Paolo Bonzini [Wed, 1 Jun 2016 12:09:21 +0000 (14:09 +0200)]
KVM: irqfd: fix NULL pointer dereference in kvm_irq_map_gsi

Found by syzkaller:

    BUG: unable to handle kernel NULL pointer dereference at 0000000000000120
    IP: [<ffffffffa0797202>] kvm_irq_map_gsi+0x12/0x90 [kvm]
    PGD 6f80b067 PUD b6535067 PMD 0
    Oops: 0000 [#1] SMP
    CPU: 3 PID: 4988 Comm: a.out Not tainted 4.4.9-300.fc23.x86_64 #1
    [...]
    Call Trace:
     [<ffffffffa0795f62>] irqfd_update+0x32/0xc0 [kvm]
     [<ffffffffa0796c7c>] kvm_irqfd+0x3dc/0x5b0 [kvm]
     [<ffffffffa07943f4>] kvm_vm_ioctl+0x164/0x6f0 [kvm]
     [<ffffffff81241648>] do_vfs_ioctl+0x298/0x480
     [<ffffffff812418a9>] SyS_ioctl+0x79/0x90
     [<ffffffff817a1062>] tracesys_phase2+0x84/0x89
    Code: b5 71 a7 e0 5b 41 5c 41 5d 5d f3 c3 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 8b 8f 10 2e 00 00 31 c0 48 89 e5 <39> 91 20 01 00 00 76 6a 48 63 d2 48 8b 94 d1 28 01 00 00 48 85
    RIP  [<ffffffffa0797202>] kvm_irq_map_gsi+0x12/0x90 [kvm]
     RSP <ffff8800926cbca8>
    CR2: 0000000000000120

Testcase:

    #include <unistd.h>
    #include <sys/syscall.h>
    #include <string.h>
    #include <stdint.h>
    #include <linux/kvm.h>
    #include <fcntl.h>
    #include <sys/ioctl.h>

    long r[26];

    int main()
    {
        memset(r, -1, sizeof(r));
        r[2] = open("/dev/kvm", 0);
        r[3] = ioctl(r[2], KVM_CREATE_VM, 0);

        struct kvm_irqfd ifd;
        ifd.fd = syscall(SYS_eventfd2, 5, 0);
        ifd.gsi = 3;
        ifd.flags = 2;
        ifd.resamplefd = ifd.fd;
        r[25] = ioctl(r[3], KVM_IRQFD, &ifd);
        return 0;
    }

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
8 years agoKVM: fail KVM_SET_VCPU_EVENTS with invalid exception number
Paolo Bonzini [Wed, 1 Jun 2016 12:09:20 +0000 (14:09 +0200)]
KVM: fail KVM_SET_VCPU_EVENTS with invalid exception number

This cannot be returned by KVM_GET_VCPU_EVENTS, so it is okay to return
EINVAL.  It causes a WARN from exception_type:

    WARNING: CPU: 3 PID: 16732 at arch/x86/kvm/x86.c:345 exception_type+0x49/0x50 [kvm]()
    CPU: 3 PID: 16732 Comm: a.out Tainted: G        W       4.4.6-300.fc23.x86_64 #1
    Hardware name: LENOVO 2325F51/2325F51, BIOS G2ET32WW (1.12 ) 05/30/2012
     0000000000000286 000000006308a48b ffff8800bec7fcf8 ffffffff813b542e
     0000000000000000 ffffffffa0966496 ffff8800bec7fd30 ffffffff810a40f2
     ffff8800552a8000 0000000000000000 00000000002c267c 0000000000000001
    Call Trace:
     [<ffffffff813b542e>] dump_stack+0x63/0x85
     [<ffffffff810a40f2>] warn_slowpath_common+0x82/0xc0
     [<ffffffff810a423a>] warn_slowpath_null+0x1a/0x20
     [<ffffffffa0924809>] exception_type+0x49/0x50 [kvm]
     [<ffffffffa0934622>] kvm_arch_vcpu_ioctl_run+0x10a2/0x14e0 [kvm]
     [<ffffffffa091c04d>] kvm_vcpu_ioctl+0x33d/0x620 [kvm]
     [<ffffffff81241248>] do_vfs_ioctl+0x298/0x480
     [<ffffffff812414a9>] SyS_ioctl+0x79/0x90
     [<ffffffff817a04ee>] entry_SYSCALL_64_fastpath+0x12/0x71
    ---[ end trace b1a0391266848f50 ]---

Testcase (beautified/reduced from syzkaller output):

    #include <unistd.h>
    #include <sys/syscall.h>
    #include <string.h>
    #include <stdint.h>
    #include <fcntl.h>
    #include <sys/ioctl.h>
    #include <linux/kvm.h>

    long r[31];

    int main()
    {
        memset(r, -1, sizeof(r));
        r[2] = open("/dev/kvm", O_RDONLY);
        r[3] = ioctl(r[2], KVM_CREATE_VM, 0);
        r[7] = ioctl(r[3], KVM_CREATE_VCPU, 0);

        struct kvm_vcpu_events ve = {
                .exception.injected = 1,
                .exception.nr = 0xd4
        };
        r[27] = ioctl(r[7], KVM_SET_VCPU_EVENTS, &ve);
        r[30] = ioctl(r[7], KVM_RUN, 0);
        return 0;
    }

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
8 years agoKVM: x86: avoid vmalloc(0) in the KVM_SET_CPUID
Paolo Bonzini [Wed, 1 Jun 2016 12:09:19 +0000 (14:09 +0200)]
KVM: x86: avoid vmalloc(0) in the KVM_SET_CPUID

This causes an ugly dmesg splat.  Beautified syzkaller testcase:

    #include <unistd.h>
    #include <sys/syscall.h>
    #include <sys/ioctl.h>
    #include <fcntl.h>
    #include <linux/kvm.h>

    long r[8];

    int main()
    {
        struct kvm_cpuid2 c = { 0 };
        r[2] = open("/dev/kvm", O_RDWR);
        r[3] = ioctl(r[2], KVM_CREATE_VM, 0);
        r[4] = ioctl(r[3], KVM_CREATE_VCPU, 0x8);
        r[7] = ioctl(r[4], KVM_SET_CPUID, &c);
        return 0;
    }

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
8 years agokvm: x86: avoid warning on repeated KVM_SET_TSS_ADDR
Paolo Bonzini [Wed, 1 Jun 2016 12:09:18 +0000 (14:09 +0200)]
kvm: x86: avoid warning on repeated KVM_SET_TSS_ADDR

Found by syzkaller:

    WARNING: CPU: 3 PID: 15175 at arch/x86/kvm/x86.c:7705 __x86_set_memory_region+0x1dc/0x1f0 [kvm]()
    CPU: 3 PID: 15175 Comm: a.out Tainted: G        W       4.4.6-300.fc23.x86_64 #1
    Hardware name: LENOVO 2325F51/2325F51, BIOS G2ET32WW (1.12 ) 05/30/2012
     0000000000000286 00000000950899a7 ffff88011ab3fbf0 ffffffff813b542e
     0000000000000000 ffffffffa0966496 ffff88011ab3fc28 ffffffff810a40f2
     00000000000001fd 0000000000003000 ffff88014fc50000 0000000000000000
    Call Trace:
     [<ffffffff813b542e>] dump_stack+0x63/0x85
     [<ffffffff810a40f2>] warn_slowpath_common+0x82/0xc0
     [<ffffffff810a423a>] warn_slowpath_null+0x1a/0x20
     [<ffffffffa09251cc>] __x86_set_memory_region+0x1dc/0x1f0 [kvm]
     [<ffffffffa092521b>] x86_set_memory_region+0x3b/0x60 [kvm]
     [<ffffffffa09bb61c>] vmx_set_tss_addr+0x3c/0x150 [kvm_intel]
     [<ffffffffa092f4d4>] kvm_arch_vm_ioctl+0x654/0xbc0 [kvm]
     [<ffffffffa091d31a>] kvm_vm_ioctl+0x9a/0x6f0 [kvm]
     [<ffffffff81241248>] do_vfs_ioctl+0x298/0x480
     [<ffffffff812414a9>] SyS_ioctl+0x79/0x90
     [<ffffffff817a04ee>] entry_SYSCALL_64_fastpath+0x12/0x71

Testcase:

    #include <unistd.h>
    #include <sys/ioctl.h>
    #include <fcntl.h>
    #include <string.h>
    #include <linux/kvm.h>

    long r[8];

    int main()
    {
        memset(r, -1, sizeof(r));
r[2] = open("/dev/kvm", O_RDONLY|O_TRUNC);
        r[3] = ioctl(r[2], KVM_CREATE_VM, 0x0ul);
        r[5] = ioctl(r[3], KVM_SET_TSS_ADDR, 0x20000000ul);
        r[7] = ioctl(r[3], KVM_SET_TSS_ADDR, 0x20000000ul);
        return 0;
    }

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
8 years agoKVM: Handle MSR_IA32_PERF_CTL
Dmitry Bilunov [Tue, 31 May 2016 14:38:24 +0000 (17:38 +0300)]
KVM: Handle MSR_IA32_PERF_CTL

Intel CPUs having Turbo Boost feature implement an MSR to provide a
control interface via rdmsr/wrmsr instructions. One could detect the
presence of this feature by issuing one of these instructions and
handling the #GP exception which is generated in case the referenced MSR
is not implemented by the CPU.

KVM's vCPU model behaves exactly as a real CPU in this case by injecting
a fault when MSR_IA32_PERF_CTL is called (which KVM does not support).
However, some operating systems use this register during an early boot
stage in which their kernel is not capable of handling #GP correctly,
causing #DP and finally a triple fault effectively resetting the vCPU.

This patch implements a dummy handler for MSR_IA32_PERF_CTL to avoid the
crashes.

Signed-off-by: Dmitry Bilunov <kmeaw@yandex-team.ru>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
8 years agoKVM: x86: avoid write-tearing of TDP
Nadav Amit [Wed, 11 May 2016 15:04:29 +0000 (08:04 -0700)]
KVM: x86: avoid write-tearing of TDP

In theory, nothing prevents the compiler from write-tearing PTEs, or
split PTE writes. These partially-modified PTEs can be fetched by other
cores and cause mayhem. I have not really encountered such case in
real-life, but it does seem possible.

For example, the compiler may try to do something creative for
kvm_set_pte_rmapp() and perform multiple writes to the PTE.

Signed-off-by: Nadav Amit <nadav.amit@gmail.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
8 years agoMerge tag 'kvm-arm-for-v4.7-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git...
Radim Krčmář [Thu, 2 Jun 2016 15:28:04 +0000 (17:28 +0200)]
Merge tag 'kvm-arm-for-v4.7-rc2' of git://git./linux/kernel/git/kvmarm/kvmarm

KVM/ARM Fixes for v4.7-rc2

Fixes for the vgic, 2 of the patches address a bug introduced in v4.6
while the rest are for the new vgic.

8 years agoARM: fix PTRACE_SETVFPREGS on SMP systems
Russell King [Mon, 30 May 2016 22:14:56 +0000 (23:14 +0100)]
ARM: fix PTRACE_SETVFPREGS on SMP systems

PTRACE_SETVFPREGS fails to properly mark the VFP register set to be
reloaded, because it undoes one of the effects of vfp_flush_hwstate().

Specifically vfp_flush_hwstate() sets thread->vfpstate.hard.cpu to
an invalid CPU number, but vfp_set() overwrites this with the original
CPU number, thereby rendering the hardware state as apparently "valid",
even though the software state is more recent.

Fix this by reverting the previous change.

Cc: <stable@vger.kernel.org>
Fixes: 8130b9d7b9d8 ("ARM: 7308/1: vfp: flush thread hwstate before copying ptrace registers")
Acked-by: Will Deacon <will.deacon@arm.com>
Tested-by: Simon Marchi <simon.marchi@ericsson.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
8 years agoKVM: arm/arm64: vgic-new: Removel harmful BUG_ON
Marc Zyngier [Thu, 2 Jun 2016 08:24:06 +0000 (09:24 +0100)]
KVM: arm/arm64: vgic-new: Removel harmful BUG_ON

When changing the active bit from an MMIO trap, we decide to
explode if the intid is that of a private interrupt.

This flawed logic comes from the fact that we were assuming that
kvm_vcpu_kick() as called by kvm_arm_halt_vcpu() would not return before
the called vcpu responded, but this is not the case, so we need to
perform this wait even for private interrupts.

Dropping the BUG_ON seems like the right thing to do.

 [ Commit message tweaked by Christoffer ]

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>