The flag tells us that the hypervisor maps a grant page to guest
physical address == machine address of the page in addition to the
normal grant mapping address. It is needed to properly issue cache
maintenance operation at the completion of a DMA operation involving a
foreign grant.
Signed-off-by: NStefano Stabellini <stefano.stabellini@eu.citrix.com>
Tested-by: NDenis Schneider <v1ne2go@gmail.com>

When RANDOMIZE_BASE (KASLR) is enabled; or the sum of all loaded
modules exceeds 512 MiB, then loading modules fails with a warning
(and hence a vmalloc allocation failure) because the PTEs for the
newly-allocated vmalloc address space are not zero.

  WARNING: CPU: 0 PID: 494 at linux/mm/vmalloc.c:128
           vmap_page_range_noflush+0x2a1/0x360()

This is caused by xen_setup_kernel_pagetables() copying
level2_kernel_pgt into level2_fixmap_pgt, overwriting many non-present
entries.

Without KASLR, the normal kernel image size only covers the first half
of level2_kernel_pgt and module space starts after that.

L4[511]->level3_kernel_pgt[510]->level2_kernel_pgt[  0..255]->kernel
                                                  [256..511]->module
                          [511]->level2_fixmap_pgt[  0..505]->module

This allows 512 MiB of of module vmalloc space to be used before
having to use the corrupted level2_fixmap_pgt entries.

With KASLR enabled, the kernel image uses the full PUD range of 1G and
module space starts in the level2_fixmap_pgt. So basically:

L4[511]->level3_kernel_pgt[510]->level2_kernel_pgt[0..511]->kernel
                          [511]->level2_fixmap_pgt[0..505]->module

And now no module vmalloc space can be used without using the corrupt
level2_fixmap_pgt entries.

Fix this by properly converting the level2_fixmap_pgt entries to MFNs,
and setting level1_fixmap_pgt as read-only.

A number of comments were also using the the wrong L3 offset for
level2_kernel_pgt.  These have been corrected.
Signed-off-by: NStefan Bader <stefan.bader@canonical.com>
Signed-off-by: NDavid Vrabel <david.vrabel@citrix.com>
Reviewed-by: NBoris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: stable@vger.kernel.org

If a gref could not be added (perhaps because the limit has been
reached or there are no more grant references available), the undo
path may crash because __del_gref() frees the gref while it is being
used for a list iteration.

A comment suggests that using list_for_each_entry() is safe since the
gref isn't removed from the list being iterated over, but it is freed
and thus list_for_each_entry_safe() must be used.

Also, explicitly delete the gref from the local per-file list, even
though this is not strictly necessary.
Signed-off-by: NDavid Vrabel <david.vrabel@citrix.com>
Reviewed-by: NBoris Ostrovsky <boris.ostrovsky@oracle.com>

Only set gref->gref_id if foreign access was successfully granted and
the grant ref is valid.

If gref->gref_id == -ENOSPC the test in __del_gref() would incorrectly
attempt to end foreign access (because grant_ref_t is unsigned).
Signed-off-by: NDavid Vrabel <david.vrabel@citrix.com>
Reported-by: NDave Scott <dave.scott@citrix.com>
Reviewed-by: NBoris Ostrovsky <boris.ostrovsky@oracle.com>

If the balloon driver is adding additional memory regions to the
balloon and add_memory() fails it will likely continuously fail so
cancel the balloon operation.
Signed-off-by: NDavid Vrabel <david.vrabel@citrix.com>
Reviewed-by: NDaniel Kiper <daniel.kiper@oracle.com>

Always freeze processes when suspending and thaw processes when resuming
to prevent a race noticeable with HVM guests.

This prevents a deadlock where the khubd kthread (which is designed to
be freezable) acquires a usb device lock and then tries to allocate
memory which requires the disk which hasn't been resumed yet.
Meanwhile, the xenwatch thread deadlocks waiting for the usb device
lock.

Freezing processes fixes this because the khubd thread is only thawed
after the xenwatch thread finishes resuming all the devices.
Signed-off-by: NRoss Lagerwall <ross.lagerwall@citrix.com>
Signed-off-by: NDavid Vrabel <david.vrabel@citrix.com>
Cc: stable@vger.kernel.org

Commit b7dd0e35 (x86/xen: safely map and unmap grant frames when
in atomic context) causes PVH guests to crash in
arch_gnttab_map_shared() when they attempted to map the pages for the
grant table.

This use of a PV-specific function during the PVH grant table setup is
non-obvious and not needed.  The standard vmap() function does the
right thing.
Signed-off-by: NDavid Vrabel <david.vrabel@citrix.com>
Reported-by: NMukesh Rathor <mukesh.rathor@oracle.com>
Tested-by: NMukesh Rathor <mukesh.rathor@oracle.com>
Cc: stable@vger.kernel.org

If the timer irqs are resumed during device resume it is possible in
certain circumstances for the resume to hang early on, before device
interrupts are resumed.  For an Ubuntu 14.04 PVHVM guest this would
occur in ~0.5% of resume attempts.

It is not entirely clear what is occuring the point of the hang but I
think a task necessary for the resume calls schedule_timeout(),
waiting for a timer interrupt (which never arrives).  This failure may
require specific tasks to be running on the other VCPUs to trigger
(processes are not frozen during a suspend/resume if PREEMPT is
disabled).

Add IRQF_EARLY_RESUME to the timer interrupts so they are resumed in
syscore_resume().
Signed-off-by: NDavid Vrabel <david.vrabel@citrix.com>
Reviewed-by: NBoris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: stable@vger.kernel.org

This was introduced in commit e306e3be (Merge tag
'stable/for-linus-3.17-rc0-tag').
Signed-off-by: NDavid Vrabel <david.vrabel@citrix.com>
Acked-by: NStefano Stabellini <stefano.stabellini@eu.citrix.com>

Pull module updates from Rusty Russell:
 "This finally applies the stricter sysfs perms checking we pulled out
  before last merge window.  A few stragglers are fixed (thanks
  linux-next!)"

* tag 'modules-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux:
  arch/powerpc/platforms/powernv/opal-dump.c: fix world-writable sysfs files
  arch/powerpc/platforms/powernv/opal-elog.c: fix world-writable sysfs files
  drivers/video/fbdev/s3c2410fb.c: don't make debug world-writable.
  ARM: avoid ARM binutils leaking ELF local symbols
  scripts: modpost: Remove numeric suffix pattern matching
  scripts: modpost: fix compilation warning
  sysfs: disallow world-writable files.
  module: return bool from within_module*()
  module: add within_module() function
  modules: Fix build error in moduleloader.h

Pull virtio updates from Rusty Russell.

* tag 'virtio-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux:
  Revert "hwrng: virtio - ensure reads happen after successful probe"
  virtio: rng: delay hwrng_register() till driver is ready
  virtio: rng: re-arrange struct elements for better packing
  virtio: rng: remove unused struct element
  virtio: Replace DEFINE_PCI_DEVICE_TABLE macro use
  virtio: console: remove unnecessary null test before debugfs_remove_recursive

Revert "proc: Point /proc/{mounts,net} at /proc/thread-self/{mounts,net} instead of /proc/self/{mounts,net}"

This reverts commits 344470ca and e8132440.

It turns out that the exact path in the symlink matters, if for somewhat
unfortunate reasons: some apparmor configurations don't allow dhclient
access to the per-thread /proc files.  As reported by Jörg Otte:

  audit: type=1400 audit(1407684227.003:28): apparmor="DENIED"
    operation="open" profile="/sbin/dhclient"
    name="/proc/1540/task/1540/net/dev" pid=1540 comm="dhclient"
    requested_mask="r" denied_mask="r" fsuid=0 ouid=0

so we had better revert this for now.  We might be able to work around
this in practice by only using the per-thread symlinks if the thread
isn't the thread group leader, and if the namespaces differ between
threads (which basically never happens).

We'll see. In the meantime, the revert was made to be intentionally easy.
Reported-by: NJörg Otte <jrg.otte@gmail.com>
Acked-by: NEric W. Biederman <ebiederm@xmission.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Pull chrome platform updates from Olof Johansson:
 "Updates to the Chromebook/box platform drivers:

   - a bugfix to pstore registration that makes it also work on
     non-Google systems
   - addition of new shipped Chromebooks (later models have more probing
     through ACPI so the need for these updates will be less over time).
   - A couple of minor coding style updates"

* tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/olof/chrome-platform:
  platform/chrome: chromeos_laptop - Add a limit for deferred retries
  platform/chrome: Add support for the acer c720p touchscreen.
  platform/chrome: pstore: fix dmi table to match all chrome systems
  platform/chrome: coding style fixes
  platform/chrome: chromeos_laptop - Add Toshiba CB35 Touch
  platform/chrome: chromeos_laptop - Add Dell Chromebook 11 touch
  platform/chrome: chromeos_laptop - Add HP Chromebook 14
  platform/chrome: chromeos_laptop - Add support for Acer C720

Pull ARM SoC fixes from Olof Johansson:
 - a short branch of OMAP fixes that we didn't merge before the window
   opened.
 - a small cleanup that sorts the rk3288 dts entries properly
 - a build fix due to a reference to a removed DT node on exynos

* tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc:
  ARM: dts: exynos5420: remove disp_pd
  ARM: EXYNOS: Fix suspend/resume sequences
  ARM: dts: Fix the sort ordering of EHCI and HSIC in rk3288.dtsi
  ARM: OMAP3: Fix coding style problems in arch/arm/mach-omap2/control.c
  ARM: OMAP3: Fix choice of omap3_restore_es function in OMAP34XX rev3.1.2 case.
  ARM: OMAP2+: clock: allow omap2_dpll_round_rate() to round to next-lowest rate

Pull nouveau drm updates from Ben Skeggs:
 "Apologies for not getting this done in time for Dave's drm-next merge
  window.  As he mentioned, a pre-existing bug reared its head a lot
  more obviously after this lot of changes.  It took quite a bit of time
  to track it down.  In any case, Dave suggested I try my luck by
  sending directly to you this time.

  Overview:

   - more code for Tegra GK20A from NVIDIA - probing, reclockig
   - better fix for Kepler GPUs that have the graphics engine powered
     off on startup, method courtesy of info provided by NVIDIA
   - unhardcoding of a bunch of graphics engine setup on
     Fermi/Kepler/Maxwell, will hopefully solve some issues people have
     noticed on higher-end models
   - support for "Zero Bandwidth Clear" on Fermi/Kepler/Maxwell, needs
     userspace support in general, but some lucky apps will benefit
     automagically
   - reviewed/exposed the full object APIs to userspace (finally), gives
     it access to perfctrs, ZBC controls, various events.  More to come
     in the future.
   - various other fixes"
Acked-by: NDave Airlie <airlied@redhat.com>

* 'linux-3.17' of git://anongit.freedesktop.org/git/nouveau/linux-2.6: (87 commits)
  drm/nouveau: expose the full object/event interfaces to userspace
  drm/nouveau: fix headless mode
  drm/nouveau: hide sysfs pstate file behind an option again
  drm/nv50/disp: shhh compiler
  drm/gf100-/gr: implement the proper SetShaderExceptions method
  drm/gf100-/gr: remove some broken ltc bashing, for now
  drm/gf100-/gr: unhardcode attribute cb config
  drm/gf100-/gr: fetch tpcs-per-ppc info on startup
  drm/gf100-/gr: unhardcode pagepool config
  drm/gf100-/gr: unhardcode bundle cb config
  drm/gf100-/gr: improve initial context patch list helpers
  drm/gf100-/gr: add support for zero bandwidth clear
  drm/nouveau/ltc: add zbc drivers
  drm/nouveau/ltc: s/ltcg/ltc/ + cleanup
  drm/nouveau: use ram info from nvif_device
  drm/nouveau/disp: implement nvif event sources for vblank/connector notifiers
  drm/nouveau/disp: allow user direct access to channel control registers
  drm/nouveau/disp: audit and version display classes
  drm/nouveau/disp: audit and version SCANOUTPOS method
  drm/nv50-/disp: audit and version PIOR_PWR method
  ...

Merge tag 'trace-ipi-tracepoints' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

Pull IPI tracepoints for ARM from Steven Rostedt:
 "Nicolas Pitre added generic tracepoints for tracing IPIs and updated
  the arm and arm64 architectures.  It required some minor updates to
  the generic tracepoint system, so it had to wait for me to implement
  them"

* tag 'trace-ipi-tracepoints' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  ARM64: add IPI tracepoints
  ARM: add IPI tracepoints
  tracepoint: add generic tracepoint definitions for IPI tracing
  tracing: Do not do anything special with tracepoint_string when tracing is disabled

Pull trace file read iterator fixes from Steven Rostedt:
 "This contains a fix for two long standing bugs.  Both of which are
  rarely ever hit, and requires the user to do something that users
  rarely do.  It took a few special test cases to even trigger this bug,
  and one of them was just one test in the process of finishing up as
  another one started.

  Both bugs have to do with the ring buffer iterator rb_iter_peek(), but
  one is more indirect than the other.

  The fist bug fix is simply an increase in the safety net loop counter.
  The counter makes sure that the rb_iter_peek() only iterates the
  number of times we expect it can, and no more.  Well, there was one
  way it could iterate one more than we expected, and that caused the
  ring buffer to shutdown with a nasty warning.  The fix was simply to
  up that counter by one.

  The other bug has to be with rb_iter_reset() (called by
  rb_iter_peek()).  This happens when a user reads both the trace_pipe
  and trace files.  The trace_pipe is a consuming read and does not use
  the ring buffer iterator, but the trace file is not a consuming read
  and does use the ring buffer iterator.  When the trace file is being
  read, if it detects that a consuming read occurred, it resets the
  iterator and starts over.  But the reset code that does this
  (rb_iter_reset()), checks if the reader_page is linked to the ring
  buffer or not, and will look into the ring buffer itself if it is not.
  This is wrong, as it should always try to read the reader page first.
  Not to mention, the code that looked into the ring buffer did it
  wrong, and used the header_page "read" offset to start reading on that
  page.  That offset is bogus for pages in the writable ring buffer, and
  was corrupting the iterator, and it would start returning bogus
  events"

* tag 'trace-fixes-3.16' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  ring-buffer: Always reset iterator to reader page
  ring-buffer: Up rb_iter_peek() loop count to 3

Pull namespace updates from Eric Biederman:
 "This is a bunch of small changes built against 3.16-rc6.  The most
  significant change for users is the first patch which makes setns
  drmatically faster by removing unneded rcu handling.

  The next chunk of changes are so that "mount -o remount,.." will not
  allow the user namespace root to drop flags on a mount set by the
  system wide root.  Aks this forces read-only mounts to stay read-only,
  no-dev mounts to stay no-dev, no-suid mounts to stay no-suid, no-exec
  mounts to stay no exec and it prevents unprivileged users from messing
  with a mounts atime settings.  I have included my test case as the
  last patch in this series so people performing backports can verify
  this change works correctly.

  The next change fixes a bug in NFS that was discovered while auditing
  nsproxy users for the first optimization.  Today you can oops the
  kernel by reading /proc/fs/nfsfs/{servers,volumes} if you are clever
  with pid namespaces.  I rebased and fixed the build of the
  !CONFIG_NFS_FS case yesterday when a build bot caught my typo.  Given
  that no one to my knowledge bases anything on my tree fixing the typo
  in place seems more responsible that requiring a typo-fix to be
  backported as well.

  The last change is a small semantic cleanup introducing
  /proc/thread-self and pointing /proc/mounts and /proc/net at it.  This
  prevents several kinds of problemantic corner cases.  It is a
  user-visible change so it has a minute chance of causing regressions
  so the change to /proc/mounts and /proc/net are individual one line
  commits that can be trivially reverted.  Unfortunately I lost and
  could not find the email of the original reporter so he is not
  credited.  From at least one perspective this change to /proc/net is a
  refgression fix to allow pthread /proc/net uses that were broken by
  the introduction of the network namespace"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace:
  proc: Point /proc/mounts at /proc/thread-self/mounts instead of /proc/self/mounts
  proc: Point /proc/net at /proc/thread-self/net instead of /proc/self/net
  proc: Implement /proc/thread-self to point at the directory of the current thread
  proc: Have net show up under /proc/<tgid>/task/<tid>
  NFS: Fix /proc/fs/nfsfs/servers and /proc/fs/nfsfs/volumes
  mnt: Add tests for unprivileged remount cases that have found to be faulty
  mnt: Change the default remount atime from relatime to the existing value
  mnt: Correct permission checks in do_remount
  mnt: Move the test for MNT_LOCK_READONLY from change_mount_flags into do_remount
  mnt: Only change user settable mount flags in remount
  namespaces: Use task_lock and not rcu to protect nsproxy

Pull SElinux fixes from Paul Moore:
 "Two small patches to fix a couple of build warnings in SELinux and
  NetLabel.  The patches are obvious enough that I don't think any
  additional explanation is necessary, but it basically boils down to
  the usual: I was stupid, and these patches fix some of the stupid.

  Both patches were posted earlier this week to the SELinux list, and
  that is where they sat as I didn't think there were noteworthy enough
  to go upstream at this point in time, but DaveM would rather see them
  upstream now so who am I to argue.  As the patches are both very
  small"

* 'stable-3.17' of git://git.infradead.org/users/pcmoore/selinux:
  selinux: remove unused variabled in the netport, netnode, and netif caches
  netlabel: fix the netlbl_catmap_setlong() dummy function

Pull nfsd updates from Bruce Fields:
 "This includes a major rewrite of the NFSv4 state code, which has
  always depended on a single mutex.  As an example, open creates are no
  longer serialized, fixing a performance regression on NFSv3->NFSv4
  upgrades.  Thanks to Jeff, Trond, and Benny, and to Christoph for
  review.

  Also some RDMA fixes from Chuck Lever and Steve Wise, and
  miscellaneous fixes from Kinglong Mee and others"

* 'for-3.17' of git://linux-nfs.org/~bfields/linux: (167 commits)
  svcrdma: remove rdma_create_qp() failure recovery logic
  nfsd: add some comments to the nfsd4 object definitions
  nfsd: remove the client_mutex and the nfs4_lock/unlock_state wrappers
  nfsd: remove nfs4_lock_state: nfs4_state_shutdown_net
  nfsd: remove nfs4_lock_state: nfs4_laundromat
  nfsd: Remove nfs4_lock_state(): reclaim_complete()
  nfsd: Remove nfs4_lock_state(): setclientid, setclientid_confirm, renew
  nfsd: Remove nfs4_lock_state(): exchange_id, create/destroy_session()
  nfsd: Remove nfs4_lock_state(): nfsd4_open and nfsd4_open_confirm
  nfsd: Remove nfs4_lock_state(): nfsd4_delegreturn()
  nfsd: Remove nfs4_lock_state(): nfsd4_open_downgrade + nfsd4_close
  nfsd: Remove nfs4_lock_state(): nfsd4_lock/locku/lockt()
  nfsd: Remove nfs4_lock_state(): nfsd4_release_lockowner
  nfsd: Remove nfs4_lock_state(): nfsd4_test_stateid/nfsd4_free_stateid
  nfsd: Remove nfs4_lock_state(): nfs4_preprocess_stateid_op()
  nfsd: remove old fault injection infrastructure
  nfsd: add more granular locking to *_delegations fault injectors
  nfsd: add more granular locking to forget_openowners fault injector
  nfsd: add more granular locking to forget_locks fault injector
  nfsd: add a list_head arg to nfsd_foreach_client_lock
  ...

Pull CIFS updates from Steve French:
 "The most visible change in this set is the additional of multi-credit
  support for SMB2/SMB3 which dramatically improves the large file i/o
  performance for these dialects and significantly increases the maximum
  i/o size used on the wire for SMB2/SMB3.

  Also reconnection behavior after network failure is improved"

* 'for-next' of git://git.samba.org/sfrench/cifs-2.6: (35 commits)
  Add worker function to set allocation size
  [CIFS] Fix incorrect hex vs. decimal in some debug print statements
  update CIFS TODO list
  Add Pavel to contributor list in cifs AUTHORS file
  Update cifs version
  CIFS: Fix STATUS_CANNOT_DELETE error mapping for SMB2
  CIFS: Optimize readpages in a short read case on reconnects
  CIFS: Optimize cifs_user_read() in a short read case on reconnects
  CIFS: Improve indentation in cifs_user_read()
  CIFS: Fix possible buffer corruption in cifs_user_read()
  CIFS: Count got bytes in read_into_pages()
  CIFS: Use separate var for the number of bytes got in async read
  CIFS: Indicate reconnect with ECONNABORTED error code
  CIFS: Use multicredits for SMB 2.1/3 reads
  CIFS: Fix rsize usage for sync read
  CIFS: Fix rsize usage in user read
  CIFS: Separate page reading from user read
  CIFS: Fix rsize usage in readpages
  CIFS: Separate page search from readpages
  CIFS: Use multicredits for SMB 2.1/3 writes
  ...

Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

No-one has yet had time to move this to debugfs as discussed during
the last merge window.  Until this happens, hide the option to make
it clear it's not going to be here forever.
Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

We have another version of it implemented in SW, however, that version
isn't serialised with normal PGRAPH operation and can possibly clobber
the enables for another context.

This is the same method that's implemented by the NVIDIA binary driver.
Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

... and hope that the defaults are good enough.  This was always
supposed to be a read/modify/write thing anyway, so we're writing
very wrong stuff for some boards already.
Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

Should be the same values as before, except:

GF117 has smaller buffer allocated, as per register setup.
GK20A now uses values from Tegra driver, not GK104's.
Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

Removes need for fixed buffer indices, and allows the functions
utilising them to also be run outside of context generation.
Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

Default ZBC table is compatible with binary driver defaults.

Userspace will need to be updated to take full advantage of this
feature, however, some applications will see a performance boost
without updated drivers.
Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

The full object interfaces are about to be exposed to userspace, so we
need to check for any security-related issues and version the structs
to make it easier to handle any changes we may need in the future.
Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

The full object interfaces are about to be exposed to userspace, so we
need to check for any security-related issues and version the structs
to make it easier to handle any changes we may need in the future.
Signed-off-by: NBen Skeggs <bskeggs@redhat.com>