Return value of this function will be that of ioctl().

#include <stdio.h>
#include <linux/kvm.h>

int main () {
	int fd;
	fd = open ("/dev/kvm", 0);
	fd = ioctl (fd, KVM_CREATE_VM, 0);
	ioctl (fd, KVM_SET_TSS_ADDR, 0xfffff000);
	perror ("");
	return 0;
}

Output is "Operation not permitted". That's not what
we want.

Return -EINVAL in this case.
Signed-off-by: NGuo Chao <yan@linux.vnet.ibm.com>
Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>

We should avoid kfree()ing error pointer in kvm_vcpu_ioctl() and
kvm_arch_vcpu_ioctl().
Signed-off-by: NGuo Chao <yan@linux.vnet.ibm.com>
Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>

* 'for-queue' of https://github.com/agraf/linux-2.6:
  PPC: ePAPR: Convert hcall header to uapi (round 2)
  KVM: PPC: Book3S HV: Fix thinko in try_lock_hpte()
  KVM: PPC: Book3S HV: Allow DTL to be set to address 0, length 0
  KVM: PPC: Book3S HV: Fix accounting of stolen time
  KVM: PPC: Book3S HV: Run virtual core whenever any vcpus in it can run
  KVM: PPC: Book3S HV: Fixes for late-joining threads
  KVM: PPC: Book3s HV: Don't access runnable threads list without vcore lock
  KVM: PPC: Book3S HV: Fix some races in starting secondary threads
  KVM: PPC: Book3S HV: Allow KVM guests to stop secondary threads coming online
  PPC: ePAPR: Convert header to uapi
  KVM: PPC: Move mtspr/mfspr emulation into own functions
  KVM: Documentation: Fix reentry-to-be-consistent paragraph
  KVM: PPC: 44x: fix DCR read/write

I have no access to my AMD email address anymore. Update
entry in MAINTAINERS to the new address.

Cc: Avi Kivity <avi@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: NJoerg Roedel <joro@8bytes.org>
Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>

The new uapi framework splits kernel internal and user space exported
bits of header files more cleanly. Adjust the ePAPR header accordingly.
Signed-off-by: NAlexander Graf <agraf@suse.de>

Conflicts:
	arch/powerpc/include/asm/Kbuild
	arch/powerpc/include/uapi/asm/Kbuild

This fixes an error in the inline asm in try_lock_hpte() where we
were erroneously using a register number as an immediate operand.
The bug only affects an error path, and in fact the code will still
work as long as the compiler chooses some register other than r0
for the "bits" variable.  Nevertheless it should still be fixed.
Signed-off-by: NPaul Mackerras <paulus@samba.org>
Signed-off-by: NAlexander Graf <agraf@suse.de>

Commit 55b665b0 ("KVM: PPC: Book3S HV: Provide a way for userspace
to get/set per-vCPU areas") includes a check on the length of the
dispatch trace log (DTL) to make sure the buffer is at least one entry
long.  This is appropriate when registering a buffer, but the
interface also allows for any existing buffer to be unregistered by
specifying a zero address.  In this case the length check is not
appropriate.  This makes the check conditional on the address being
non-zero.
Signed-off-by: NPaul Mackerras <paulus@samba.org>
Signed-off-by: NAlexander Graf <agraf@suse.de>

Currently the code that accounts stolen time tends to overestimate the
stolen time, and will sometimes report more stolen time in a DTL
(dispatch trace log) entry than has elapsed since the last DTL entry.
This can cause guests to underflow the user or system time measured
for some tasks, leading to ridiculous CPU percentages and total runtimes
being reported by top and other utilities.

In addition, the current code was designed for the previous policy where
a vcore would only run when all the vcpus in it were runnable, and so
only counted stolen time on a per-vcore basis.  Now that a vcore can
run while some of the vcpus in it are doing other things in the kernel
(e.g. handling a page fault), we need to count the time when a vcpu task
is preempted while it is not running as part of a vcore as stolen also.

To do this, we bring back the BUSY_IN_HOST vcpu state and extend the
vcpu_load/put functions to count preemption time while the vcpu is
in that state.  Handling the transitions between the RUNNING and
BUSY_IN_HOST states requires checking and updating two variables
(accumulated time stolen and time last preempted), so we add a new
spinlock, vcpu->arch.tbacct_lock.  This protects both the per-vcpu
stolen/preempt-time variables, and the per-vcore variables while this
vcpu is running the vcore.

Finally, we now don't count time spent in userspace as stolen time.
The task could be executing in userspace on behalf of the vcpu, or
it could be preempted, or the vcpu could be genuinely stopped.  Since
we have no way of dividing up the time between these cases, we don't
count any of it as stolen.
Signed-off-by: NPaul Mackerras <paulus@samba.org>
Signed-off-by: NAlexander Graf <agraf@suse.de>

Currently the Book3S HV code implements a policy on multi-threaded
processors (i.e. POWER7) that requires all of the active vcpus in a
virtual core to be ready to run before we run the virtual core.
However, that causes problems on reset, because reset stops all vcpus
except vcpu 0, and can also reduce throughput since all four threads
in a virtual core have to wait whenever any one of them hits a
hypervisor page fault.

This relaxes the policy, allowing the virtual core to run as soon as
any vcpu in it is runnable.  With this, the KVMPPC_VCPU_STOPPED state
and the KVMPPC_VCPU_BUSY_IN_HOST state have been combined into a single
KVMPPC_VCPU_NOTREADY state, since we no longer need to distinguish
between them.
Signed-off-by: NPaul Mackerras <paulus@samba.org>
Signed-off-by: NAlexander Graf <agraf@suse.de>

If a thread in a virtual core becomes runnable while other threads
in the same virtual core are already running in the guest, it is
possible for the latecomer to join the others on the core without
first pulling them all out of the guest.  Currently this only happens
rarely, when a vcpu is first started.  This fixes some bugs and
omissions in the code in this case.

First, we need to check for VPA updates for the latecomer and make
a DTL entry for it.  Secondly, if it comes along while the master
vcpu is doing a VPA update, we don't need to do anything since the
master will pick it up in kvmppc_run_core.  To handle this correctly
we introduce a new vcore state, VCORE_STARTING.  Thirdly, there is
a race because we currently clear the hardware thread's hwthread_req
before waiting to see it get to nap.  A latecomer thread could have
its hwthread_req cleared before it gets to test it, and therefore
never increment the nap_count, leading to messages about wait_for_nap
timeouts.
Signed-off-by: NPaul Mackerras <paulus@samba.org>
Signed-off-by: NAlexander Graf <agraf@suse.de>

There were a few places where we were traversing the list of runnable
threads in a virtual core, i.e. vc->runnable_threads, without holding
the vcore spinlock.  This extends the places where we hold the vcore
spinlock to cover everywhere that we traverse that list.

Since we possibly need to sleep inside kvmppc_book3s_hv_page_fault,
this moves the call of it from kvmppc_handle_exit out to
kvmppc_vcpu_run, where we don't hold the vcore lock.

In kvmppc_vcore_blocked, we don't actually need to check whether
all vcpus are ceded and don't have any pending exceptions, since the
caller has already done that.  The caller (kvmppc_run_vcpu) wasn't
actually checking for pending exceptions, so we add that.

The change of if to while in kvmppc_run_vcpu is to make sure that we
never call kvmppc_remove_runnable() when the vcore state is RUNNING or
EXITING.
Signed-off-by: NPaul Mackerras <paulus@samba.org>
Signed-off-by: NAlexander Graf <agraf@suse.de>

Subsequent patches implementing in-kernel XICS emulation will make it
possible for IPIs to arrive at secondary threads at arbitrary times.
This fixes some races in how we start the secondary threads, which
if not fixed could lead to occasional crashes of the host kernel.

This makes sure that (a) we have grabbed all the secondary threads,
and verified that they are no longer in the kernel, before we start
any thread, (b) that the secondary thread loads its vcpu pointer
after clearing the IPI that woke it up (so we don't miss a wakeup),
and (c) that the secondary thread clears its vcpu pointer before
incrementing the nap count.  It also removes unnecessary setting
of the vcpu and vcore pointers in the paca in kvmppc_core_vcpu_load.
Signed-off-by: NPaul Mackerras <paulus@samba.org>
Signed-off-by: NAlexander Graf <agraf@suse.de>

When a Book3S HV KVM guest is running, we need the host to be in
single-thread mode, that is, all of the cores (or at least all of
the cores where the KVM guest could run) to be running only one
active hardware thread.  This is because of the hardware restriction
in POWER processors that all of the hardware threads in the core
must be in the same logical partition.  Complying with this restriction
is much easier if, from the host kernel's point of view, only one
hardware thread is active.

This adds two hooks in the SMP hotplug code to allow the KVM code to
make sure that secondary threads (i.e. hardware threads other than
thread 0) cannot come online while any KVM guest exists.  The KVM
code still has to check that any core where it runs a guest has the
secondary threads offline, but having done that check it can now be
sure that they will not come online while the guest is running.
Signed-off-by: NPaul Mackerras <paulus@samba.org>
Acked-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: NAlexander Graf <agraf@suse.de>

The new uapi framework splits kernel internal and user space exported
bits of header files more cleanly. Adjust the ePAPR header accordingly.
Signed-off-by: NAlexander Graf <agraf@suse.de>

The mtspr/mfspr emulation code became quite big over time. Move it
into its own function so things stay more readable.
Signed-off-by: NAlexander Graf <agraf@suse.de>

All user space offloaded instruction emulation needs to reenter kvm
to produce consistent state again. Fix the section in the documentation
to mention all of them.
Signed-off-by: NAlexander Graf <agraf@suse.de>

When remembering the direction of a DCR transaction, we should write
to the same variable that we interpret on later when doing vcpu_run
again.
Signed-off-by: NAlexander Graf <agraf@suse.de>
Cc: stable@vger.kernel.org

This patch filters noslot pfn out from error pfns based on Marcelo comment:
noslot pfn is not a error pfn

After this patch,
- is_noslot_pfn indicates that the gfn is not in slot
- is_error_pfn indicates that the gfn is in slot but the error is occurred
  when translate the gfn to pfn
- is_error_noslot_pfn indicates that the pfn either it is error pfns or it
  is noslot pfn
And is_invalid_pfn can be removed, it makes the code more clean
Signed-off-by: NXiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>

Merge reason: development work has dependency on kvm patches merged
upstream.

Conflicts:
	arch/powerpc/include/asm/Kbuild
	arch/powerpc/include/asm/kvm_para.h
Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>

Pull Ceph fixes form Sage Weil:
 "There are two fixes in the messenger code, one that can trigger a NULL
  dereference, and one that error in refcounting (extra put).  There is
  also a trivial fix that in the fs client code that is triggered by NFS
  reexport."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client:
  ceph: fix dentry reference leak in encode_fh()
  libceph: avoid NULL kref_put when osd reset races with alloc_msg
  rbd: reset BACKOFF if unable to re-queue

Call to d_find_alias() needs a corresponding dput()

This fixes http://tracker.newdream.net/issues/3271Signed-off-by: NDavid Zafman <david.zafman@inktank.com>
Reviewed-by: NSage Weil <sage@inktank.com>

Pull i2c subsystem fixes from Jean Delvare.

* 'i2c-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging:
  i2c-i801: Fix comment
  i2c-i801: Simplify dependency towards GPIOLIB
  i2c-stub: Move to drivers/i2c

Signed-off-by: NJean Delvare <khali@linux-fr.org>

Arbitrarily selecting GPIOLIB causes trouble on some architectures,
so don't do that. Instead, just make the optional multiplexing code
depend on CONFIG_I2C_MUX_GPIO instead of CONFIG_I2C_MUX for now. We
can revisit if the i2c-i801 driver ever supports other multiplexing
flavors.

Also make that optional code depend on DMI, as it won't do anything
without that.
Signed-off-by: NJean Delvare <khali@linux-fr.org>
Cc: Fengguang Wu <fengguang.wu@intel.com>

Move the i2c-stub driver to drivers/i2c, to match the Kconfig entry.
This is less confusing that way.

I also fixed all checkpatch warnings and errors.
Signed-off-by: NJean Delvare <khali@linux-fr.org>
Cc: Peter Huewe <peterhuewe@gmx.de>

Pull ktest confusion fix from Steven Rostedt:
 "With the v3.7-rc2 kernel, the network cards on my target boxes were
  not being brought up.

  I found that the modules for the network was not being installed.
  This was due to the config CONFIG_MODULES_USE_ELF_RELA that came
  before CONFIG_MODULES, and confused ktest in thinking that
  CONFIG_MODULES=y was not found.

  Ktest needs to test all configs and not just stop if something starts
  with CONFIG_MODULES."

* tag 'ktest-v3.7-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-ktest:
  ktest: Fix ktest confusion with CONFIG_MODULES_USE_ELF_RELA

Pull minor spi MXS fixes from Mark Brown:
 "These fixes are both pretty minor ones and are driver local."

* tag 'spi-mxs' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/misc:
  spi: mxs: Terminate DMA in case of DMA timeout
  spi: mxs: Assign message status after transfer finished

Pull arm-soc fixes from Arnd Bergmann:
 "Bug fixes for a number of ARM platforms, mostly OMAP, imx and at91.

  These come a little later than I had hoped but unfortunately we had a
  few of these patches cause regressions themselves and had to work out
  how to deal with those in the meantime."

* tag 'fixes-for-3.7' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (38 commits)
  Revert "ARM i.MX25: Fix PWM per clock lookups"
  ARM: versatile: fix versatile_defconfig
  ARM: mvebu: update defconfig with 3.7 changes
  ARM: at91: fix at91x40 build
  ARM: socfpga: Fix socfpga compilation with early_printk() enabled
  ARM: SPEAr: Remove unused empty files
  MAINTAINERS: Add arm-soc tree entry
  ARM: dts: mxs: add the "clock-names" for gpmi-nand
  ARM: ux500: Correct SDI5 address and add some format changes
  ARM: ux500: Specify AMBA Primecell IDs for Nomadik I2C in DT
  ARM: ux500: Fix build error relating to IRQCHIP_SKIP_SET_WAKE
  ARM: at91: drop duplicated config SOC_AT91SAM9 entry
  ARM: at91/i2c: change id to let i2c-at91 work
  ARM: at91/i2c: change id to let i2c-gpio work
  ARM: at91/dts: at91sam9g20ek_common: Fix typos in buttons labels.
  ARM: at91: fix external interrupt specification in board code
  ARM: at91: fix external interrupts in non-DT case
  ARM: at91: at91sam9g10: fix SOC type detection
  ARM: at91/tc: fix typo in the DT document
  ARM: AM33XX: Fix configuration of dmtimer parent clock by dmtimer driverDate:Wed, 17 Oct 2012 13:55:55 -0500
  ...

Functions generic_file_splice_read and generic_file_splice_write access
the pagecache directly. For block devices these functions must be locked
so that block size is not changed while they are in progress.

This patch is an additional fix for commit b87570f5 ("Fix a crash
when block device is read and block size is changed at the same time")
that locked aio_read, aio_write and mmap against block size change.
Signed-off-by: NMikulas Patocka <mpatocka@redhat.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Use rcu_read_lock_sched / rcu_read_unlock_sched / synchronize_sched
instead of rcu_read_lock / rcu_read_unlock / synchronize_rcu.

This is an optimization. The RCU-protected region is very small, so
there will be no latency problems if we disable preempt in this region.

So we use rcu_read_lock_sched / rcu_read_unlock_sched that translates
to preempt_disable / preempt_disable. It is smaller (and supposedly
faster) than preemptible rcu_read_lock / rcu_read_unlock.
Signed-off-by: NMikulas Patocka <mpatocka@redhat.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

This patch introduces new barrier pair light_mb() and heavy_mb() for
percpu rw semaphores.

This patch fixes a bug in percpu-rw-semaphores where a barrier was
missing in percpu_up_write.

This patch improves performance on the read path of
percpu-rw-semaphores: on non-x86 cpus, there was a smp_mb() in
percpu_up_read. This patch changes it to a compiler barrier and removes
the "#if defined(X86) ..." condition.

From: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: NMikulas Patocka <mpatocka@redhat.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

This reverts commit 92063cee, it
was applied prematurely, causing this build error for
imx_v4_v5_defconfig:

arch/arm/mach-imx/clk-imx25.c: In function 'mx25_clocks_init':
arch/arm/mach-imx/clk-imx25.c:206:26: error: 'pwm_ipg_per' undeclared (first use in this function)
arch/arm/mach-imx/clk-imx25.c:206:26: note: each undeclared identifier is reported only once for each function it appears in

Sascha Hauer explains:
> There are several gates missing in clk-imx25.c. I have a patch which
> adds support for them and I seem to have missed that the above depends
> on it.
Signed-off-by: NArnd Bergmann <arnd@arndb.de>

With the introduction of CONFIG_ARCH_MULTIPLATFORM, versatile is
no longer the default platform, so we need to enable
CONFIG_ARCH_VERSATILE explicitly in order for that to be selected
rather than the multiplatform configuration.
Signed-off-by: NArnd Bergmann <arnd@arndb.de>

The split of 370 and XP into two Kconfig options and the multiplatform
kernel support has changed a few Kconfig symbols, so let's update the
mvebu_defconfig file with the latest changes.
Signed-off-by: NThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: NArnd Bergmann <arnd@arndb.de>

patch 738a0fd7 "ARM: at91: fix external interrupts in non-DT case"
fixed a run-time error on some at91 platforms but did not apply
the same change to at91x40, which now doesn't build.

This changes at91x40 in the same way that the other platforms
were changed.
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Acked-by: NJean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

Pull networking fixes from David Miller:
 "This is what we usually expect at this stage of the game, lots of
  little things, mostly in drivers.  With the occasional 'oops didn't
  mean to do that' kind of regressions in the core code."

 1) Uninitialized data in __ip_vs_get_timeouts(), from Arnd Bergmann

 2) Reject invalid ACK sequences in Fast Open sockets, from Jerry Chu.

 3) Lost error code on return from _rtl_usb_receive(), from Christian
    Lamparter.

 4) Fix reset resume on USB rt2x00, from Stanislaw Gruszka.

 5) Release resources on error in pch_gbe driver, from Veaceslav Falico.

 6) Default hop limit not set correctly in ip6_template_metrics[], fix
    from Li RongQing.

 7) Gianfar PTP code requests wrong kind of resource during probe, fix
    from Wei Yang.

 8) Fix VHOST net driver on big-endian, from Michael S Tsirkin.

 9) Mallenox driver bug fixes from Jack Morgenstein, Or Gerlitz, Moni
    Shoua, Dotan Barak, and Uri Habusha.

10) usbnet leaks memory on TX path, fix from Hemant Kumar.

11) Use socket state test, rather than presence of FIN bit packet, to
    determine FIONREAD/SIOCINQ value.  Fix from Eric Dumazet.

12) Fix cxgb4 build failure, from Vipul Pandya.

13) Provide a SYN_DATA_ACKED state to complement SYN_FASTOPEN in socket
    info dumps.  From Yuchung Cheng.

14) Fix leak of security path in kfree_skb_partial().  Fix from Eric
    Dumazet.

15) Handle RX FIFO overflows more resiliently in pch_gbe driver, from
    Veaceslav Falico.

16) Fix MAINTAINERS file pattern for networking drivers, from Jean
    Delvare.

17) Add iPhone5 IDs to IPHETH driver, from Jay Purohit.

18) VLAN device type change restriction is too strict, and should not
    trigger for the automatically generated vlan0 device.  Fix from Jiri
    Pirko.

19) Make PMTU/redirect flushing work properly again in ipv4, from
    Steffen Klassert.

20) Fix memory corruptions by using kfree_rcu() in netlink_release().
    From Eric Dumazet.

21) More qmi_wwan device IDs, from Bjørn Mork.

22) Fix unintentional change of SNAT/DNAT hooks in generic NAT
    infrastructure, from Elison Niven.

23) Fix 3.6.x regression in xt_TEE netfilter module, from Eric Dumazet.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (57 commits)
  tilegx: fix some issues in the SW TSO support
  qmi_wwan/cdc_ether: move Novatel 551 and E362 to qmi_wwan
  net: usb: Fix memory leak on Tx data path
  net/mlx4_core: Unmap UAR also in the case of error flow
  net/mlx4_en: Don't use vlan tag value as an indication for vlan presence
  net/mlx4_en: Fix double-release-range in tx-rings
  bas_gigaset: fix pre_reset handling
  vhost: fix mergeable bufs on BE hosts
  gianfar_ptp: use iomem, not ioports resource tree in probe
  ipv6: Set default hoplimit as zero.
  NET_VENDOR_TI: make available for am33xx as well
  pch_gbe: fix error handling in pch_gbe_up()
  b43: Fix oops on unload when firmware not found
  mwifiex: clean up scan state on error
  mwifiex: return -EBUSY if specific scan request cannot be honored
  brcmfmac: fix potential NULL dereference
  Revert "ath9k_hw: Updated AR9003 tx gain table for 5GHz"
  ath9k_htc: Add PID/VID for a Ubiquiti WiFiStation
  rt2x00: usb: fix reset resume
  rtlwifi: pass rx setup error code to caller
  ...

Pull slave-dmaengine fixes from Vinod Koul:
 "Three fixes for slave dmanegine.

  Two are for typo omissions in sifr dmaengine driver and the last one
  is for the imx driver fixing a missing unlock"

* 'fixes' of git://git.infradead.org/users/vkoul/slave-dma:
  dmaengine: sirf: fix a typo in moving running dma_desc to active queue
  dmaengine: sirf: fix a typo in dma_prep_interleaved
  dmaengine: imx-dma: fix missing unlock on error in imxdma_xfer_desc()

Pull power management and ACPI fixes from Rafael J Wysocki:

 - Fix for a memory leak in acpi_bind_one() from Jesper Juhl.

 - Fix for an error code path memory leak in pm_genpd_attach_cpuidle()
   from Jonghwan Choi.

 - Fix for smp_processor_id() usage in preemptible code in powernow-k8
   from Andreas Herrmann.

 - Fix for a suspend-related memory leak in cpufreq stats from Xiaobing
   Tu.

 - Freezer fix for failure to clear PF_NOFREEZE along with PF_KTHREAD in
   flush_old_exec() from Oleg Nesterov.

 - acpi_processor_notify() fix from Alan Cox.

* tag 'pm+acpi-for-3.7-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI: missing break
  freezer: exec should clear PF_NOFREEZE along with PF_KTHREAD
  Fix memory leak in cpufreq stats.
  cpufreq / powernow-k8: Remove usage of smp_processor_id() in preemptible code
  PM / Domains: Fix memory leak on error path in pm_genpd_attach_cpuidle
  ACPI: Fix memory leak in acpi_bind_one()