linux.git/arch/arm/include, branch v4.3-rc2

Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

2015-09-18T16:23:08+00:00

Pull KVM fixes from Paolo Bonzini:
 "Mostly stable material, a lot of ARM fixes"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (22 commits)
  sched: access local runqueue directly in single_task_running
  arm/arm64: KVM: Remove 'config KVM_ARM_MAX_VCPUS'
  arm64: KVM: Remove all traces of the ThumbEE registers
  arm: KVM: Disable virtual timer even if the guest is not using it
  arm64: KVM: Disable virtual timer even if the guest is not using it
  arm/arm64: KVM: vgic: Check for !irqchip_in_kernel() when mapping resources
  KVM: s390: Replace incorrect atomic_or with atomic_andnot
  arm: KVM: Fix incorrect device to IPA mapping
  arm64: KVM: Fix user access for debug registers
  KVM: vmx: fix VPID is 0000H in non-root operation
  KVM: add halt_attempted_poll to VCPU stats
  kvm: fix zero length mmio searching
  kvm: fix double free for fast mmio eventfd
  kvm: factor out core eventfd assign/deassign logic
  kvm: don't try to register to KVM_FAST_MMIO_BUS for non mmio eventfd
  KVM: make the declaration of functions within 80 characters
  KVM: arm64: add workaround for Cortex-A57 erratum #852523
  KVM: fix polling for guest halt continued even if disable it
  arm/arm64: KVM: Fix PSCI affinity info return value for non valid cores
  arm64: KVM: set {v,}TCR_EL2 RES1 bits
  ...

Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2015-09-18T15:11:42+00:00

Pull irq updates from Thomas Gleixner:
 "This is a rather large update post rc1 due to the final steps of
  cleanups and API changes which had to wait for the preparatory patches
  to hit your tree.

   - Regression fixes for ARM GIC irqchips

   - Regression fixes and lockdep anotations for renesas irq chips

   - The leftovers of the cleanup and preparatory patches which have
     been ignored by maintainers

   - Final conversions of the newly merged users of obsolete APIs

   - Final removal of obsolete APIs

   - Final removal of ARM artifacts which had been introduced during the
     conversion of ARM to the generic interrupt code.

   - Final split of the irq_data into chip specific and common data to
     reflect the needs of hierarchical irq domains.

   - Treewide removal of the first argument of interrupt flow handlers,
     i.e. the irq number, which is not used by the majority of handlers
     and simple to retrieve from the other argument the irq descriptor.

   - A few comment updates and build warning fixes"

* 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (40 commits)
  arm64: Remove ununsed set_irq_flags
  ARM: Remove ununsed set_irq_flags
  sh: Kill off set_irq_flags usage
  irqchip: Kill off set_irq_flags usage
  gpu/drm: Kill off set_irq_flags usage
  genirq: Remove irq argument from irq flow handlers
  genirq: Move field 'msi_desc' from irq_data into irq_common_data
  genirq: Move field 'affinity' from irq_data into irq_common_data
  genirq: Move field 'handler_data' from irq_data into irq_common_data
  genirq: Move field 'node' from irq_data into irq_common_data
  irqchip/gic-v3: Use IRQD_FORWARDED_TO_VCPU flag
  irqchip/gic: Use IRQD_FORWARDED_TO_VCPU flag
  genirq: Provide IRQD_FORWARDED_TO_VCPU status flag
  genirq: Simplify irq_data_to_desc()
  genirq: Remove __irq_set_handler_locked()
  pinctrl/pistachio: Use irq_set_handler_locked
  gpio: vf610: Use irq_set_handler_locked
  powerpc/mpc8xx: Use irq_set_handler_locked()
  powerpc/ipic: Use irq_set_handler_locked()
  powerpc/cpm2: Use irq_set_handler_locked()
  ...

Merge tag 'kvm-arm-for-4.3-rc2-2' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into kvm-master

2015-09-17T14:51:59+00:00

Second set of KVM/ARM changes for 4.3-rc2

- Workaround for a Cortex-A57 erratum
- Bug fix for the debugging infrastructure
- Fix for 32bit guests with more than 4GB of address space
  on a 32bit host
- A number of fixes for the (unusual) case when we don't use
  the in-kernel GIC emulation
- Removal of ThumbEE handling on arm64, since these have been
  dropped from the architecture before anyone actually ever
  built a CPU
- Remove the KVM_ARM_MAX_VCPUS limitation which has become
  fairly pointless

arm/arm64: KVM: Remove 'config KVM_ARM_MAX_VCPUS'

2015-09-17T12:13:27+00:00

This patch removes config option of KVM_ARM_MAX_VCPUS,
and like other ARCHs, just choose the maximum allowed
value from hardware, and follows the reasons:

1) from distribution view, the option has to be
defined as the max allowed value because it need to
meet all kinds of virtulization applications and
need to support most of SoCs;

2) using a bigger value doesn't introduce extra memory
consumption, and the help text in Kconfig isn't accurate
because kvm_vpu structure isn't allocated until request
of creating VCPU is sent from QEMU;

3) the main effect is that the field of vcpus[] in 'struct kvm'
becomes a bit bigger(sizeof(void *) per vcpu) and need more cache
lines to hold the structure, but 'struct kvm' is one generic struct,
and it has worked well on other ARCHs already in this way. Also,
the world switch frequecy is often low, for example, it is ~2000
when running kernel building load in VM from APM xgene KVM host,
so the effect is very small, and the difference can't be observed
in my test at all.

Cc: Dann Frazier 
Signed-off-by: Ming Lei 
Reviewed-by: Christoffer Dall 
Signed-off-by: Marc Zyngier

ARM: Remove ununsed set_irq_flags

2015-09-16T14:53:39+00:00

Now that all users of set_irq_flags and custom flags are converted to
genirq functions, the ARM specific set_irq_flags can be removed.

Signed-off-by: Rob Herring 
Tested-by: Kevin Hilman 
Cc: linux-arm-kernel@lists.infradead.org
Cc: Russell King 
Signed-off-by: Thomas Gleixner

genirq: Remove irq argument from irq flow handlers

2015-09-16T13:47:51+00:00

Most interrupt flow handlers do not use the irq argument. Those few
which use it can retrieve the irq number from the irq descriptor.

Remove the argument.

Search and replace was done with coccinelle and some extra helper
scripts around it. Thanks to Julia for her help!

Signed-off-by: Thomas Gleixner 
Cc: Julia Lawall 
Cc: Jiang Liu

KVM: add halt_attempted_poll to VCPU stats

2015-09-16T10:17:00+00:00

This new statistic can help diagnosing VCPUs that, for any reason,
trigger bad behavior of halt_poll_ns autotuning.

For example, say halt_poll_ns = 480000, and wakeups are spaced exactly
like 479us, 481us, 479us, 481us. Then KVM always fails polling and wastes
10+20+40+80+160+320+480 = 1110 microseconds out of every
479+481+479+481+479+481+479 = 3359 microseconds. The VCPU then
is consuming about 30% more CPU than it would use without
polling.  This would show as an abnormally high number of
attempted polling compared to the successful polls.

Acked-by: Christian Borntraeger 
Signed-off-by: Paolo Bonzini

Merge branch 'fixes' of git://ftp.arm.linux.org.uk/~rmk/linux-arm

2015-09-14T19:24:10+00:00

Pull ARM fixes from Russell King:
 "A number of fixes for the merge window, fixing a number of cases
  missed when testing the uaccess code, particularly cases which only
  show up with certain compiler versions"

* 'fixes' of git://ftp.arm.linux.org.uk/~rmk/linux-arm:
  ARM: 8431/1: fix alignement of __bug_table section entries
  arm/xen: Enable user access to the kernel before issuing a privcmd call
  ARM: domains: add memory dependencies to get_domain/set_domain
  ARM: domains: thread_info.h no longer needs asm/domains.h
  ARM: uaccess: fix undefined instruction on ARMv7M/noMMU
  ARM: uaccess: remove unneeded uaccess_save_and_disable macro
  ARM: swpan: fix nwfpe for uaccess changes
  ARM: 8429/1: disable GCC SRA optimization

Merge branch 'uaccess' into fixes

2015-09-11T18:18:28+00:00

ARM: 8431/1: fix alignement of __bug_table section entries

2015-09-11T18:18:19+00:00

On old ARM chips, unaligned accesses to memory are not trapped and
fixed.  On module load, symbols are relocated, and the relocation of
__bug_table symbols is done on a u32 basis. Yet the section is not
aligned to a multiple of 4 address, but to a multiple of 2.

This triggers an Oops on pxa architecture, where address 0xbf0021ea
is the first relocation in the __bug_table section :
  apply_relocate(): pxa3xx_nand: section 13 reloc 0 sym ''
  Unable to handle kernel paging request at virtual address bf0021ea
  pgd = e1cd0000
  [bf0021ea] *pgd=c1cce851, *pte=c1cde04f, *ppte=c1cde01f
  Internal error: Oops: 23 [#1] ARM
  Modules linked in:
  CPU: 0 PID: 606 Comm: insmod Not tainted 4.2.0-rc8-next-20150828-cm-x300+ #887
  Hardware name: CM-X300 module
  task: e1c68700 ti: e1c3e000 task.ti: e1c3e000
  PC is at apply_relocate+0x2f4/0x3d4
  LR is at 0xbf0021ea
  pc : []    lr : []    psr: 80000013
  sp : e1c3fe30  ip : 60000013  fp : e49e8c60
  r10: e49e8fa8  r9 : 00000000  r8 : e49e7c58
  r7 : e49e8c38  r6 : e49e8a58  r5 : e49e8920  r4 : e49e8918
  r3 : bf0021ea  r2 : bf007034  r1 : 00000000  r0 : bf000000
  Flags: Nzcv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
  Control: 0000397f  Table: c1cd0018  DAC: 00000051
  Process insmod (pid: 606, stack limit = 0xe1c3e198)
  [] (apply_relocate) from [] (load_module+0x1248/0x1f5c)
  [] (load_module) from [] (SyS_init_module+0xe4/0x170)
  [] (SyS_init_module) from [] (ret_fast_syscall+0x0/0x38)

Fix this by ensuring entries in __bug_table are all aligned to at least
of multiple of 4. This transforms a module section  __bug_table as :
-   [12] __bug_table       PROGBITS        00000000 002232 000018 00   A  0   0  1
+   [12] __bug_table       PROGBITS        00000000 002232 000018 00   A  0   0  4

Signed-off-by: Robert Jarzmik 
Reviewed-by: Dave Martin 
Signed-off-by: Russell King