Punit Agrawal [Tue, 18 Nov 2014 11:41:22 +0000 (11:41 +0000)]
arm64: Add support for hooks to handle undefined instructions
Add support to register hooks for undefined instructions. The handlers
will be called when the undefined instruction and the processor state
(as contained in pstate) match criteria used at registration.
Steve Capper [Wed, 19 Nov 2014 16:53:43 +0000 (16:53 +0000)]
arm64: percpu: Implement this_cpu operations
The generic this_cpu operations disable interrupts to ensure that the
requested operation is protected from pre-emption. For arm64, this is
overkill and can hurt throughput and latency.
This patch provides arm64 specific implementations for the this_cpu
operations. Rather than disable interrupts, we use the exclusive
monitor or atomic operations as appropriate.
The following operations are implemented: add, add_return, and, or,
read, write, xchg. We also wire up a cmpxchg implementation from
cmpxchg.h.
Testing was performed using the percpu_test module and hackbench on a
Juno board running 3.18-rc4.
Signed-off-by: Steve Capper <steve.capper@linaro.org> Reviewed-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Mark Rutland [Wed, 19 Nov 2014 17:44:12 +0000 (17:44 +0000)]
arm64: pgalloc: consistently use PGALLOC_GFP
We currently allocate different levels of page tables with a variety of
differing flags, and the PGALLOC_GFP flags, intended for use when
allocating any level of page table, are only used for ptes in
pte_alloc_one. On x86, PGALLOC_GFP is used for all page table
allocations.
Currently the major differences are:
* __GFP_NOTRACK -- Needed to ensure page tables are always accessible in
the presence of kmemcheck to prevent recursive faults. Currently
kmemcheck cannot be selected for arm64.
* __GFP_REPEAT -- Causes the allocator to try to reclaim pages and retry
upon a failure to allocate.
* __GFP_ZERO -- Sometimes passed explicitly, sometimes zalloc variants
are used.
While we've no encountered issues so far, it would be preferable to be
consistent. This patch ensures all levels of table are allocated in the
same manner, with PGALLOC_GFP.
Cc: Steve Capper <steve.capper@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Yann Droneaud [Mon, 17 Nov 2014 23:02:19 +0000 (23:02 +0000)]
arm64/mm: Remove hack in mmap randomize layout
Since commit 8a0a9bd4db63 ('random: make get_random_int() more
random'), get_random_int() returns a random value for each call,
so comment and hack introduced in mmap_rnd() as part of commit 1d18c47c735e ('arm64: MMU fault handling and page table management')
are incorrects.
Commit 1d18c47c735e seems to use the same hack introduced by
commit a5adc91a4b44 ('powerpc: Ensure random space between stack
and mmaps'), latter copied in commit 5a0efea09f42 ('sparc64: Sharpen
address space randomization calculations.').
But both architectures were cleaned up as part of commit fa8cbaaf5a68 ('powerpc+sparc64/mm: Remove hack in mmap randomize
layout') as hack is no more needed since commit 8a0a9bd4db63.
So the present patch removes the comment and the hack around
get_random_int() on AArch64's mmap_rnd().
Cc: David S. Miller <davem@davemloft.net> Cc: Anton Blanchard <anton@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: Will Deacon <will.deacon@arm.com> Acked-by: Dan McGee <dpmcgee@gmail.com> Signed-off-by: Yann Droneaud <ydroneaud@opteya.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Catalin Marinas [Mon, 17 Nov 2014 10:37:40 +0000 (10:37 +0000)]
arm64: Add COMPAT_HWCAP_LPAE
Commit a469abd0f868 (ARM: elf: add new hwcap for identifying atomic
ldrd/strd instructions) introduces HWCAP_ELF for 32-bit ARM
applications. As LPAE is always present on arm64, report the
corresponding compat HWCAP to user space.
Will Deacon [Wed, 29 Oct 2014 10:03:09 +0000 (10:03 +0000)]
mmu_gather: move minimal range calculations into generic code
On architectures with hardware broadcasting of TLB invalidation messages
, it makes sense to reduce the range of the mmu_gather structure when
unmapping page ranges based on the dirty address information passed to
tlb_remove_tlb_entry.
arm64 already does this by directly manipulating the start/end fields
of the gather structure, but this confuses the generic code which
does not expect these fields to change and can end up calculating
invalid, negative ranges when forcing a flush in zap_pte_range.
This patch moves the minimal range calculation out of the arm64 code
and into the generic implementation, simplifying zap_pte_range in the
process (which no longer needs to care about start/end, since they will
point to the appropriate ranges already). With the range being tracked
by core code, the need_flush flag is dropped in favour of checking that
the end of the range has actually been set.
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Russell King - ARM Linux <linux@arm.linux.org.uk> Cc: Michal Simek <monstr@monstr.eu> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
Will Deacon [Mon, 29 Sep 2014 11:26:41 +0000 (12:26 +0100)]
arm64: entry: use ldp/stp instead of push/pop when saving/restoring regs
The push/pop instructions can be suboptimal when saving/restoring large
amounts of data to/from the stack, for example on entry/exit from the
kernel. This is because:
(1) They act on descending addresses (i.e. the newly decremented sp),
which may defeat some hardware prefetchers
(2) They introduce an implicit dependency between each instruction, as
the sp has to be updated in order to resolve the address of the
next access.
This patch removes the push/pop instructions from our kernel entry/exit
macros in favour of ldp/stp plus offset.
Mark Rutland [Fri, 24 Oct 2014 13:56:40 +0000 (14:56 +0100)]
arm64: Fix up /proc/cpuinfo
Commit d7a49086f263164a (arm64: cpuinfo: print info for all CPUs)
attempted to clean up /proc/cpuinfo, but due to concerns regarding
further changes was reverted in commit 5e39977edf6500fd (Revert "arm64:
cpuinfo: print info for all CPUs").
There are two major issues with the arm64 /proc/cpuinfo format
currently:
* The "Features" line describes (only) the 64-bit hwcaps, which is
problematic for some 32-bit applications which attempt to parse it. As
the same names are used for analogous ISA features (e.g. aes) despite
these generally being architecturally unrelated, it is not possible to
simply append the 64-bit and 32-bit hwcaps in a manner that might not
be misleading to some applications.
Various potential solutions have appeared in vendor kernels. Typically
the format of the Features line varies depending on whether the task
is 32-bit.
* Information is only printed regarding a single CPU. This does not
match the ARM format, and does not provide sufficient information in
big.LITTLE systems where CPUs are heterogeneous. The CPU information
printed is queried from the current CPU's registers, which is racy
w.r.t. cross-cpu migration.
This patch attempts to solve these issues. The following changes are
made:
* When a task with a LINUX32 personality attempts to read /proc/cpuinfo,
the "Features" line contains the decoded 32-bit hwcaps, as with the
arm port. Otherwise, the decoded 64-bit hwcaps are shown. This aligns
with the behaviour of COMPAT_UTS_MACHINE and COMPAT_ELF_PLATFORM. In
the absense of compat support, the Features line is empty.
The set of hwcaps injected into a task's auxval are unaffected.
* Properties are printed per-cpu, as with the ARM port. The per-cpu
information is queried from pre-recorded cpu information (as used by
the sanity checks).
* As with the previous attempt at fixing up /proc/cpuinfo, the hardware
field is removed. The only users so far are 32-bit applications tied
to particular boards, so no portable applications should be affected,
and this should prevent future tying to particular boards.
The following differences remain:
* No model_name is printed, as this cannot be queried from the hardware
and cannot be provided in a stable fashion. Use of the CPU
{implementor,variant,part,revision} fields is sufficient to identify a
CPU and is portable across arm and arm64.
* The following system-wide properties are not provided, as they are not
possible to provide generally. Programs relying on these are already
tied to particular (32-bit only) boards:
- Hardware
- Revision
- Serial
No software has yet been identified for which these remaining
differences are problematic.
Cc: Greg Hackmann <ghackmann@google.com> Cc: Ian Campbell <ijc@hellion.org.uk> Cc: Serban Constantinescu <serban.constantinescu@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: cross-distro@lists.linaro.org Cc: linux-api@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Mark Rutland [Tue, 4 Nov 2014 10:50:16 +0000 (10:50 +0000)]
arm64: log physical ID of boot CPU
In certain debugging scenarios it's useful to know the physical ID (i.e.
the MPIDR_EL1.Aff* fields) of the boot CPU, but we don't currently log
this as we do for 32-bit ARM kernels.
This patch makes the kernel log the physical ID of the boot CPU early in
the boot process. The CPU logical map initialisation is folded in to
smp_setup_processor_id (which contrary to its name is also called by UP
kernels). This is called before setup_arch, so should not adversely
affect existing cpu_logical_map users.
Acked-by: Sudeep Holla <sudeep.holla@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Lorenzo Pieralisis <lorenzo.pieralisi@arm.com> Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Ard Biesheuvel [Mon, 3 Nov 2014 16:50:01 +0000 (16:50 +0000)]
arm64/crypto: use crypto instructions to generate AES key schedule
This patch implements the AES key schedule generation using ARMv8
Crypto Instructions. It replaces the table based C implementation
in aes_generic.ko, which means we can drop the dependency on that
module.
Tested-by: Steve Capper <steve.capper@linaro.org> Acked-by: Steve Capper <steve.capper@linaro.org> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
Geoff Levand [Fri, 31 Oct 2014 23:06:47 +0000 (23:06 +0000)]
arm64/kvm: Fix assembler compatibility of macros
Some of the macros defined in kvm_arm.h are useful in assembly files, but are
not compatible with the assembler. Change any C language integer constant
definitions using appended U, UL, or ULL to the UL() preprocessor macro. Also,
add a preprocessor include of the asm/memory.h file which defines the UL()
macro.
Fixes build errors like these when using kvm_arm.h in assembly
source files:
Error: unexpected characters following instruction at operand 3 -- `and x0,x1,#((1U<<25)-1)'
Acked-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Geoff Levand <geoff@infradead.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
Ard Biesheuvel [Tue, 28 Oct 2014 12:24:20 +0000 (12:24 +0000)]
arm64/dt: add machine name to kernel call stack dump output
This installs the machine name as recorded by setup_machine_fdt()
as dump stack arch description. This results in the string to be
included in call stack dumps, as is shown here:
...
Bad mode in Synchronous Abort handler detected, code 0x84000005
CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.18.0-rc2+ #548
> Hardware name: linux,dummy-virt (DT)
task: ffffffc07c870000 ti: ffffffc07c878000 task.ti: ffffffc07c878000
PC is at 0x0
...
Note that systems that support DMI/SMBIOS may override this later.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
Steve Capper [Fri, 24 Oct 2014 12:22:20 +0000 (13:22 +0100)]
arm64: xchg: Implement cmpxchg_double
The arm64 architecture has the ability to exclusively load and store
a pair of registers from an address (ldxp/stxp). Also the SLUB can take
advantage of a cmpxchg_double implementation to avoid taking some
locks.
This patch provides an implementation of cmpxchg_double for 64-bit
pairs, and activates the logic required for the SLUB to use these
functions (HAVE_ALIGNED_STRUCT_PAGE and HAVE_CMPXCHG_DOUBLE).
Also definitions of this_cpu_cmpxchg_8 and this_cpu_cmpxchg_double_8
are wired up to cmpxchg_local and cmpxchg_double_local (rather than the
stock implementations that perform non-atomic operations with
interrupts disabled) as they are used by the SLUB.
On a Juno platform running on only the A57s I get quite a noticeable
performance improvement with 5 runs of hackbench on v3.17:
Baseline | With Patch
-----------------+-----------
Mean 119.2312 | 106.1782
StdDev 0.4919 | 0.4494
(times taken to complete `./hackbench 100 process 1000', in seconds)
Signed-off-by: Steve Capper <steve.capper@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
Joonwoo Park [Tue, 21 Oct 2014 00:59:03 +0000 (01:59 +0100)]
arm64: optimize memcpy_{from,to}io() and memset_io()
Optimize memcpy_{from,to}io() and memset_io() by transferring in 64 bit
as much as possible with minimized barrier usage. This simplest
optimization brings faster throughput compare to current byte-by-byte read
and write with barrier in the loop. Code's skeleton is taken from the
powerpc.
Min-Hua Chen [Thu, 9 Oct 2014 15:53:10 +0000 (16:53 +0100)]
arm64: fix data type for physical address
Use phys_addr_t for physical address in alloc_init_pud. Although
phys_addr_t and unsigned long are 64 bit in arm64, it is better
to use phys_addr_t to describe physical addresses.
Signed-off-by: Min-Hua Chen <orca.chen@gmail.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Will Deacon [Wed, 5 Nov 2014 13:01:13 +0000 (13:01 +0000)]
Merge tag 'for-3.19' of git://git.linaro.org/people/ard.biesheuvel/linux-arm into ard/efi-for-3.19
Pull UEFI updates from Ard Biesheuvel:
- fixes for compliance with PE/COFF and UEFI specs
- added support for SMBIOS, including upcoming version 3.0
- cleanups and diagnostic output improvements
Mark Rutland [Thu, 23 Oct 2014 15:33:33 +0000 (16:33 +0100)]
efi: efi-stub: notify on DTB absence
In the absence of a DTB configuration table, the EFI stub will happily
continue attempting to boot a kernel, despite the fact that this kernel
may not function without a description of the hardware. In this case, as
with a typo'd "dtb=" option (e.g. "dbt=") or many other possible
failures, the only output seen by the user will be the rather terse
output from the EFI stub:
EFI stub: Booting Linux Kernel...
To aid those attempting to debug such failures, this patch adds a notice
when no DTB is found, making the output more helpful:
EFI stub: Booting Linux Kernel...
EFI stub: Generating empty DTB
Additionally, a positive acknowledgement is added when a user-specified
DTB is in use:
EFI stub: Booting Linux Kernel...
EFI stub: Using DTB from command line
Similarly, a positive acknowledgement is added when a DTB from a
configuration table is in use:
EFI stub: Booting Linux Kernel...
EFI stub: Using DTB from configuration table
Signed-off-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Leif Lindholm <leif.lindholm@linaro.org> Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Acked-by: Roy Franz <roy.franz@linaro.org> Acked-by: Matt Fleming <matt.fleming@intel.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Ard Biesheuvel [Wed, 15 Oct 2014 07:36:50 +0000 (09:36 +0200)]
arm64: dmi: set DMI string as dump stack arch description
This sets the DMI string, containing system type, serial number,
firmware version etc. as dump stack arch description, so that oopses
and other kernel stack dumps automatically have this information
included, if available.
Yi Li [Sat, 4 Oct 2014 15:46:43 +0000 (23:46 +0800)]
arm64: dmi: Add SMBIOS/DMI support
SMBIOS is important for server hardware vendors. It implements a spec for
providing descriptive information about the platform. Things like serial
numbers, physical layout of the ports, build configuration data, and the like.
Signed-off-by: Yi Li <yi.li@linaro.org> Tested-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> Tested-by: Leif Lindholm <leif.lindholm@linaro.org> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Ard Biesheuvel [Tue, 14 Oct 2014 14:41:27 +0000 (16:41 +0200)]
dmi: add support for SMBIOS 3.0 64-bit entry point
The DMTF SMBIOS reference spec v3.0.0 defines a new 64-bit entry point,
which enables support for SMBIOS structure tables residing at a physical
offset over 4 GB. This is especially important for upcoming arm64
platforms whose system RAM resides entirely above the 4 GB boundary.
For the UEFI case, this code attempts to detect the new SMBIOS 3.0
header magic at the offset passed in the SMBIOS3_TABLE_GUID UEFI
configuration table. If this configuration table is not provided, or
if we fail to parse the header, we fall back to using the legacy
SMBIOS_TABLE_GUID configuration table. This is in line with the spec,
that allows both configuration tables to be provided, but mandates that
they must point to the same structure table, unless the version pointed
to by the 64-bit entry point is a superset of the 32-bit one.
For the non-UEFI case, the detection logic is modified to look for the
SMBIOS 3.0 header magic before it looks for the legacy header magic.
Note that this patch is based on version 3.0.0d [draft] of the
specification, which is expected not to deviate from the final version
in ways that would affect the correctness of this implementation.
Tested-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> Acked-by: Leif Lindholm <leif.lindholm@linaro.org> Tested-by: Leif Lindholm <leif.lindholm@linaro.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Tony Luck <tony.luck@intel.com> Acked-by: Matt Fleming <matt.fleming@intel.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Ard Biesheuvel [Tue, 14 Oct 2014 14:34:47 +0000 (16:34 +0200)]
efi: dmi: add support for SMBIOS 3.0 UEFI configuration table
This adds support to the UEFI side for detecting the presence of
a SMBIOS 3.0 64-bit entry point. This allows the actual SMBIOS
structure table to reside at a physical offset over 4 GB, which
cannot be supported by the legacy SMBIOS 32-bit entry point.
Since the firmware can legally provide both entry points, store
the SMBIOS 3.0 entry point in a separate variable, and let the
DMI decoding layer decide which one will be used.
Ard Biesheuvel [Mon, 20 Oct 2014 13:31:57 +0000 (15:31 +0200)]
arm64/efi: invert UEFI memory region reservation logic
Instead of reserving the memory regions based on which types we know
need to be reserved, consider only regions of the following types as
free for general use by the OS:
Note that this also fixes a problem with the original code, which would
misidentify a EFI_RUNTIME_SERVICES_DATA region as not reserved if it
does not have the EFI_MEMORY_RUNTIME attribute set. However, it is
perfectly legal for the firmware not to request a virtual mapping for
EFI_RUNTIME_SERVICES_DATA regions that contain configuration tables, in
which case the EFI_MEMORY_RUNTIME attribute would not be set.
Acked-by: Roy Franz <roy.franz@linaro.org> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Ard Biesheuvel [Fri, 10 Oct 2014 09:25:24 +0000 (11:25 +0200)]
arm64/efi: set PE/COFF section alignment to 4 KB
Position independent AArch64 code needs to be linked and loaded at the
same relative offset from a 4 KB boundary, or adrp/add and adrp/ldr
pairs will not work correctly. (This is how PC relative symbol
references with a 4 GB reach are emitted)
We need to declare this in the PE/COFF header, otherwise the PE/COFF
loader may load the Image and invoke the stub at an offset which
violates this rule.
Reviewed-by: Roy Franz <roy.franz@linaro.org> Acked-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Ard Biesheuvel [Wed, 8 Oct 2014 14:11:27 +0000 (16:11 +0200)]
arm64/efi: efistub: jump to 'stext' directly, not through the header
After the EFI stub has done its business, it jumps into the kernel by
branching to offset #0 of the loaded Image, which is where it expects
to find the header containing a 'branch to stext' instruction.
However, the UEFI spec 2.1.1 states the following regarding PE/COFF
image loading:
"A UEFI image is loaded into memory through the LoadImage() Boot
Service. This service loads an image with a PE32+ format into memory.
This PE32+ loader is required to load all sections of the PE32+ image
into memory."
In other words, it is /not/ required to load parts of the image that are
not covered by a PE/COFF section, so it may not have loaded the header
at the expected offset, as it is not covered by any PE/COFF section.
So instead, jump to 'stext' directly, which is at the base of the
PE/COFF .text section, by supplying a symbol 'stext_offset' to
efi-entry.o which contains the relative offset of stext into the Image.
Also replace other open coded calculations of the same value with a
reference to 'stext_offset'
Acked-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Roy Franz <roy.franz@linaro.org> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Linus Torvalds [Sun, 26 Oct 2014 18:35:51 +0000 (11:35 -0700)]
Merge tag 'armsoc-for-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Pull ARM SoC fixes from Olof Johansson:
"Another week, another small batch of fixes.
Most of these make zynq, socfpga and sunxi platforms work a bit
better:
- due to new requirements for regulators, DWMMC on socfpga broke past
v3.17
- SMP spinup fix for socfpga
- a few DT fixes for zynq
- another option (FIXED_REGULATOR) for sunxi is needed that used to
be selected by other options but no longer is.
- a couple of small DT fixes for at91
- ...and a couple for i.MX"
* tag 'armsoc-for-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc:
ARM: dts: imx28-evk: Let i2c0 run at 100kHz
ARM: i.MX6: Fix "emi" clock name typo
ARM: multi_v7_defconfig: enable CONFIG_MMC_DW_ROCKCHIP
ARM: sunxi_defconfig: enable CONFIG_REGULATOR_FIXED_VOLTAGE
ARM: dts: socfpga: Add a 3.3V fixed regulator node
ARM: dts: socfpga: Fix SD card detect
ARM: dts: socfpga: rename gpio nodes
ARM: at91/dt: sam9263: fix PLLB frequencies
power: reset: at91-reset: fix power down register
MAINTAINERS: add atmel ssc driver maintainer entry
arm: socfpga: fix fetching cpu1start_addr for SMP
ARM: zynq: DT: trivial: Fix mc node
ARM: zynq: DT: Add cadence watchdog node
ARM: zynq: DT: Add missing reference for memory-controller
ARM: zynq: DT: Add missing reference for ADC
ARM: zynq: DT: Add missing address for L2 pl310
ARM: zynq: DT: Remove 222 MHz OPP
ARM: zynq: DT: Fix GEM register area size
Olof Johansson [Sun, 26 Oct 2014 03:44:05 +0000 (20:44 -0700)]
Merge tag 'imx-fixes-3.18' of git://git.kernel.org/pub/scm/linux/kernel/git/shawnguo/linux into fixes
Merge "ARM: imx: fixes for 3.18" from Shawn Guo:
The i.MX fixes for 3.18:
- Revert one patch which increases I2C bus frequency on imx28-evk
- Fix a typo on imx6q EIM clock name
* tag 'imx-fixes-3.18' of git://git.kernel.org/pub/scm/linux/kernel/git/shawnguo/linux:
ARM: dts: imx28-evk: Let i2c0 run at 100kHz
ARM: i.MX6: Fix "emi" clock name typo
Linus Torvalds [Fri, 24 Oct 2014 19:48:47 +0000 (12:48 -0700)]
Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus
Pull MIPS fixes from Ralf Baechle:
"This is the first round of fixes and tying up loose ends for MIPS.
- plenty of fixes for build errors in specific obscure configurations
- remove redundant code on the Lantiq platform
- removal of a useless SEAD I2C driver that was causing a build issue
- fix an earlier TLB exeption handler fix to also work on Octeon.
- fix ISA level dependencies in FPU emulator's instruction decoding.
- don't hardcode kernel command line in Octeon software emulator.
- fix an earlier fix for the Loondson 2 clock setting"
* 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus:
MIPS: SEAD3: Fix I2C device registration.
MIPS: SEAD3: Nuke PIC32 I2C driver.
MIPS: ftrace: Fix a microMIPS build problem
MIPS: MSP71xx: Fix build error
MIPS: Malta: Do not build the malta-amon.c file if CMP is not enabled
MIPS: Prevent compiler warning from cop2_{save,restore}
MIPS: Kconfig: Add missing MIPS_CPS dependencies to PM and cpuidle
MIPS: idle: Remove leftover __pastwait symbol and its references
MIPS: Sibyte: Include the swarm subdir to the sb1250 LittleSur builds
MIPS: ptrace.h: Add a missing include
MIPS: ath79: Fix compilation error when CONFIG_PCI is disabled
MIPS: MSP71xx: Remove compilation error when CONFIG_MIPS_MT is present
MIPS: Octeon: Remove special case for simulator command line.
MIPS: tlbex: Properly fix HUGE TLB Refill exception handler
MIPS: loongson2_cpufreq: Fix CPU clock rate setting mismerge
pci: pci-lantiq: remove duplicate check on resource
MIPS: Lasat: Add missing CONFIG_PROC_FS dependency to PICVUE_PROC
MIPS: cp1emu: Fix ISA restrictions for cop1x_op instructions
Linus Torvalds [Fri, 24 Oct 2014 19:48:04 +0000 (12:48 -0700)]
Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
Pull arm64 fixes from Catalin Marinas:
- enable 48-bit VA space now that KVM has been fixed, together with a
couple of fixes for pgd allocation alignment and initial memblock
current_limit. There is still a dependency on !ARM_SMMU which needs
to be updated as it uses the page table manipulation macros of the
host kernel
- eBPF fixes following changes/conflicts during the merging window
- Compat types affecting compat_elf_prpsinfo
- Compilation error on UP builds
- ASLR fix when /proc/sys/kernel/randomize_va_space == 0
- DT definitions for CLCD support on ARMv8 model platform
* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
arm64: Fix memblock current_limit with 64K pages and 48-bit VA
arm64: ASLR: Don't randomise text when randomise_va_space == 0
arm64: vexpress: Add CLCD support to the ARMv8 model platform
arm64: Fix compilation error on UP builds
Documentation/arm64/memory.txt: fix typo
net: bpf: arm64: minor fix of type in jited
arm64: bpf: add 'load 64-bit immediate' instruction
arm64: bpf: add 'shift by register' instructions
net: bpf: arm64: address randomize and write protect JIT code
arm64: mm: Correct fixmap pagetable types
arm64: compat: fix compat types affecting struct compat_elf_prpsinfo
arm64: Align less than PAGE_SIZE pgds naturally
arm64: Allow 48-bits VA space without ARM_SMMU
1) Fix boots with gcc-4.9 compiled sparc64 kernels.
2) Add missing __get_user_pages_fast() on sparc64 to fix hangs on
futexes used in transparent hugepage areas.
It's really idiotic to have a weak symbolled fallback that just
returns zero, and causes this kind of bug. There should be no
backup implementation and the link should fail if the architecture
fails to provide __get_user_pages_fast() and supports transparent
hugepages.
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc:
sparc64: Implement __get_user_pages_fast().
sparc64: Fix register corruption in top-most kernel stack frame during boot.
Linus Torvalds [Fri, 24 Oct 2014 19:42:55 +0000 (12:42 -0700)]
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Pull kvm fixes from Paolo Bonzini:
"This is a pretty large update. I think it is roughly as big as what I
usually had for the _whole_ rc period.
There are a few bad bugs where the guest can OOPS or crash the host.
We have also started looking at attack models for nested
virtualization; bugs that usually result in the guest ring 0 crashing
itself become more worrisome if you have nested virtualization,
because the nested guest might bring down the non-nested guest as
well. For current uses of nested virtualization these do not really
have a security impact, but you never know and bugs are bugs
nevertheless.
A lot of these bugs are in 3.17 too, resulting in a large number of
stable@ Ccs. I checked that all the patches apply there with no
conflicts"
* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
kvm: vfio: fix unregister kvm_device_ops of vfio
KVM: x86: Wrong assertion on paging_tmpl.h
kvm: fix excessive pages un-pinning in kvm_iommu_map error path.
KVM: x86: PREFETCH and HINT_NOP should have SrcMem flag
KVM: x86: Emulator does not decode clflush well
KVM: emulate: avoid accessing NULL ctxt->memopp
KVM: x86: Decoding guest instructions which cross page boundary may fail
kvm: x86: don't kill guest on unknown exit reason
kvm: vmx: handle invvpid vm exit gracefully
KVM: x86: Handle errors when RIP is set during far jumps
KVM: x86: Emulator fixes for eip canonical checks on near branches
KVM: x86: Fix wrong masking on relative jump/call
KVM: x86: Improve thread safety in pit
KVM: x86: Prevent host from panicking on shared MSR writes.
KVM: x86: Check non-canonical addresses upon WRMSR
Linus Torvalds [Fri, 24 Oct 2014 19:41:50 +0000 (12:41 -0700)]
Merge tag 'stable/for-linus-3.18-b-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
Pull xen bug fixes from David Vrabel:
- Fix regression in xen_clocksource_read() which caused all Xen guests
to crash early in boot.
- Several fixes for super rare race conditions in the p2m.
- Assorted other minor fixes.
* tag 'stable/for-linus-3.18-b-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
xen/pci: Allocate memory for physdev_pci_device_add's optarr
x86/xen: panic on bad Xen-provided memory map
x86/xen: Fix incorrect per_cpu accessor in xen_clocksource_read()
x86/xen: avoid race in p2m handling
x86/xen: delay construction of mfn_list_list
x86/xen: avoid writing to freed memory after race in p2m handling
xen/balloon: Don't continue ballooning when BP_ECANCELED is encountered
Linus Torvalds [Fri, 24 Oct 2014 19:35:48 +0000 (12:35 -0700)]
Merge tag 'sound-3.18-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
Pull sound fixes from Takashi Iwai:
"Here are a chunk of small fixes since rc1: two PCM core fixes, one is
a long-standing annoyance about lockdep and another is an ARM64 mmap
fix.
The rest are a HD-audio HDMI hotplug notification fix, a fix for
missing NULL termination in Realtek codec quirks and a few new
device/codec-specific quirks as usual"
* tag 'sound-3.18-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
ALSA: hda - Add missing terminating entry to SND_HDA_PIN_QUIRK macro
ALSA: pcm: Fix false lockdep warnings
ALSA: hda - Fix inverted LED gpio setup for Lenovo Ideapad
ALSA: hda - hdmi: Fix missing ELD change event on plug/unplug
ALSA: usb-audio: Add support for Steinberg UR22 USB interface
ALSA: ALC283 codec - Avoid pop noise on headphones during suspend/resume
ALSA: pcm: use the same dma mmap codepath both for arm and arm64
Linus Torvalds [Fri, 24 Oct 2014 19:33:32 +0000 (12:33 -0700)]
Merge tag 'random_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/random
Pull /dev/random updates from Ted Ts'o:
"This adds a memzero_explicit() call which is guaranteed not to be
optimized away by GCC. This is important when we are wiping
cryptographically sensitive material"
* tag 'random_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/random:
crypto: memzero_explicit - make sure to clear out sensitive data
random: add and use memzero_explicit() for clearing data
Linus Torvalds [Fri, 24 Oct 2014 18:29:31 +0000 (11:29 -0700)]
Merge tag 'pm+acpi-3.18-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull ACPI and power management updates from Rafael Wysocki:
"This is material that didn't make it to my 3.18-rc1 pull request for
various reasons, mostly related to timing and travel (LinuxCon EU /
LPC) plus a couple of fixes for recent bugs.
The only really new thing here is the PM QoS class for memory
bandwidth, but it is simple enough and users of it will be added in
the next cycle. One major change in behavior is that platform devices
enumerated by ACPI will use 32-bit DMA mask by default. Also included
is an ACPICA update to a new upstream release, but that's mostly
cleanups, changes in tools and similar. The rest is fixes and
cleanups mostly.
Specifics:
- Fix for a recent PCI power management change that overlooked the
fact that some IRQ chips might not be able to configure PCIe PME
for system wakeup from Lucas Stach.
- Fix for a bug introduced in 3.17 where acpi_device_wakeup() is
called with a wrong ordering of arguments from Zhang Rui.
- A bunch of intel_pstate driver fixes (all -stable candidates) from
Dirk Brandewie, Gabriele Mazzotta and Pali Rohár.
- Fixes for a rather long-standing problem with the OOM killer and
the freezer that frozen processes killed by the OOM do not actually
release any memory until they are thawed, so OOM-killing them is
rather pointless, with a couple of cleanups on top (Michal Hocko,
Cong Wang, Rafael J Wysocki).
- ACPICA update to upstream release 20140926, inlcuding mostly
cleanups reducing differences between the upstream ACPICA and the
kernel code, tools changes (acpidump, acpiexec) and support for the
_DDN object (Bob Moore, Lv Zheng).
- New PM QoS class for memory bandwidth from Tomeu Vizoso.
- Default 32-bit DMA mask for platform devices enumerated by ACPI
(this change is mostly needed for some drivers development in
progress targeted at 3.19) from Heikki Krogerus.
- ACPI EC driver cleanups, mostly related to debugging, from Lv
Zheng.
- cpufreq-dt driver updates from Thomas Petazzoni.
- powernv cpuidle driver update from Preeti U Murthy"
* tag 'pm+acpi-3.18-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (34 commits)
intel_pstate: Correct BYT VID values.
intel_pstate: Fix BYT frequency reporting
intel_pstate: Don't lose sysfs settings during cpu offline
cpufreq: intel_pstate: Reflect current no_turbo state correctly
cpufreq: expose scaling_cur_freq sysfs file for set_policy() drivers
cpufreq: intel_pstate: Fix setting max_perf_pct in performance policy
PCI / PM: handle failure to enable wakeup on PCIe PME
ACPI: invoke acpi_device_wakeup() with correct parameters
PM / freezer: Clean up code after recent fixes
PM: convert do_each_thread to for_each_process_thread
OOM, PM: OOM killed task shouldn't escape PM suspend
freezer: remove obsolete comments in __thaw_task()
freezer: Do not freeze tasks killed by OOM killer
ACPI / platform: provide default DMA mask
cpuidle: powernv: Populate cpuidle state details by querying the device-tree
cpufreq: cpufreq-dt: adjust message related to regulators
cpufreq: cpufreq-dt: extend with platform_data
cpufreq: allow driver-specific data
ACPI / EC: Cleanup coding style.
ACPI / EC: Refine event/query debugging messages.
...
Linus Torvalds [Fri, 24 Oct 2014 18:21:43 +0000 (11:21 -0700)]
Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux
Pull thermal management updates from Zhang Rui:
"Sorry that I missed the merge window as there is a bug found in the
last minute, and I have to fix it and wait for the code to be tested
in linux-next tree for a few days. Now the buggy patch has been
dropped entirely from my next branch. Thus I hope those changes can
still be merged in 3.18-rc2 as most of them are platform thermal
driver changes.
Specifics:
- introduce ACPI INT340X thermal drivers.
Newer laptops and tablets may have thermal sensors and other
devices with thermal control capabilities that are exposed for the
OS to use via the ACPI INT340x device objects. Several drivers are
introduced to expose the temperature information and cooling
ability from these objects to user-space via the normal thermal
framework.
From: Lu Aaron, Lan Tianyu, Jacob Pan and Zhang Rui.
- introduce a new thermal governor, which just uses a hysteresis to
switch abruptly on/off a cooling device. This governor can be used
to control certain fan devices that can not be throttled but just
switched on or off. From: Peter Feuerer.
- introduce support for some new thermal interrupt functions on
i.MX6SX, in IMX thermal driver. From: Anson, Huang.
- introduce tracing support on thermal framework. From: Punit
Agrawal.
- small fixes in OF thermal and thermal step_wise governor"
* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux: (25 commits)
Thermal: int340x thermal: select ACPI fan driver
Thermal: int3400_thermal: use acpi_thermal_rel parsing APIs
Thermal: int340x_thermal: expose acpi thermal relationship tables
Thermal: introduce int3403 thermal driver
Thermal: introduce INT3402 thermal driver
Thermal: move the KELVIN_TO_MILLICELSIUS macro to thermal.h
ACPI / Fan: support INT3404 thermal device
ACPI / Fan: add ACPI 4.0 style fan support
ACPI / fan: convert to platform driver
ACPI / fan: use acpi_device_xxx_power instead of acpi_bus equivelant
ACPI / fan: remove no need check for device pointer
ACPI / fan: remove unused macro
Thermal: int3400 thermal: register to thermal framework
Thermal: int3400 thermal: add capability to detect supporting UUIDs
Thermal: introduce int3400 thermal driver
ACPI: add ACPI_TYPE_LOCAL_REFERENCE support to acpi_extract_package()
ACPI: make acpi_create_platform_device() an external API
thermal: step_wise: fix: Prevent from binary overflow when trend is dropping
ACPI: introduce ACPI int340x thermal scan handler
thermal: Added Bang-bang thermal governor
...
Catalin Marinas [Fri, 24 Oct 2014 17:16:47 +0000 (18:16 +0100)]
arm64: Fix memblock current_limit with 64K pages and 48-bit VA
With 48-bit VA space, the 64K page configuration uses 3 levels instead
of 2 and PUD_SIZE != PMD_SIZE. Since with 64K pages we only cover
PMD_SIZE with the initial swapper_pg_dir populated in head.S, the
memblock current_limit needs to be set accordingly in map_mem() to avoid
allocating unmapped memory. The memblock current_limit is progressively
increased as more blocks are mapped.
David S. Miller [Fri, 24 Oct 2014 16:59:02 +0000 (09:59 -0700)]
sparc64: Implement __get_user_pages_fast().
It is not sufficient to only implement get_user_pages_fast(), you
must also implement the atomic version __get_user_pages_fast()
otherwise you end up using the weak symbol fallback implementation
which simply returns zero.
This is dangerous, because it causes the futex code to loop forever
if transparent hugepages are supported (see get_futex_key()).
Signed-off-by: David S. Miller <davem@davemloft.net>
David S. Miller [Thu, 23 Oct 2014 19:58:13 +0000 (12:58 -0700)]
sparc64: Fix register corruption in top-most kernel stack frame during boot.
Meelis Roos reported that kernels built with gcc-4.9 do not boot, we
eventually narrowed this down to only impacting machines using
UltraSPARC-III and derivitive cpus.
The crash happens right when the first user process is spawned:
[ 54.451346] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000004
[ 54.451346]
[ 54.571516] CPU: 1 PID: 1 Comm: init Not tainted 3.16.0-rc2-00211-gd7933ab #96
[ 54.666431] Call Trace:
[ 54.698453] [0000000000762f8c] panic+0xb0/0x224
[ 54.759071] [000000000045cf68] do_exit+0x948/0x960
[ 54.823123] [000000000042cbc0] fault_in_user_windows+0xe0/0x100
[ 54.902036] [0000000000404ad0] __handle_user_windows+0x0/0x10
[ 54.978662] Press Stop-A (L1-A) to return to the boot prom
[ 55.050713] ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000004
Further investigation showed that compiling only per_cpu_patch() with
an older compiler fixes the boot.
Detailed analysis showed that the function is not being miscompiled by
gcc-4.9, but it is using a different register allocation ordering.
With the gcc-4.9 compiled function, something during the code patching
causes some of the %i* input registers to get corrupted. Perhaps
we have a TLB miss path into the firmware that is deep enough to
cause a register window spill and subsequent restore when we get
back from the TLB miss trap.
Let's plug this up by doing two things:
1) Stop using the firmware stack for client interface calls into
the firmware. Just use the kernel's stack.
2) As soon as we can, call into a new function "start_early_boot()"
to put a one-register-window buffer between the firmware's
deepest stack frame and the top-most initial kernel one.
Reported-by: Meelis Roos <mroos@linux.ee> Tested-by: Meelis Roos <mroos@linux.ee> Signed-off-by: David S. Miller <davem@davemloft.net>
Arun Chandran [Fri, 10 Oct 2014 11:31:24 +0000 (12:31 +0100)]
arm64: ASLR: Don't randomise text when randomise_va_space == 0
When user asks to turn off ASLR by writing "0" to
/proc/sys/kernel/randomize_va_space there should not be
any randomization to mmap base, stack, VDSO, libs, text and heap
Currently arm64 violates this behavior by randomising text.
Fix this by defining a constant ELF_ET_DYN_BASE. The randomisation of
mm->mmap_base is done by setup_new_exec -> arch_pick_mmap_layout ->
mmap_base -> mmap_rnd.
Wanpeng Li [Thu, 9 Oct 2014 10:30:08 +0000 (18:30 +0800)]
kvm: vfio: fix unregister kvm_device_ops of vfio
After commit 80ce163 (KVM: VFIO: register kvm_device_ops dynamically),
kvm_device_ops of vfio can be registered dynamically. Commit 3c3c29fd
(kvm-vfio: do not use module_init) move the dynamic register invoked by
kvm_init in order to fix broke unloading of the kvm module. However,
kvm_device_ops of vfio is unregistered after rmmod kvm-intel module
which lead to device type collision detection warning after kvm-intel
module reinsmod.
without rmmod/insmod kvm.ko
This patch fixes the bug by unregistering kvm_device_ops of vfio when the
kvm-intel module is removed.
Reported-by: Liu Rongrong <rongrongx.liu@intel.com> Fixes: 3c3c29fd0d7cddc32862c350d0700ce69953e3bd Signed-off-by: Wanpeng Li <wanpeng.li@linux.intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Nadav Amit [Tue, 30 Sep 2014 17:49:18 +0000 (20:49 +0300)]
KVM: x86: Wrong assertion on paging_tmpl.h
Even after the recent fix, the assertion on paging_tmpl.h is triggered.
Apparently, the assertion wants to check that the PAE is always set on
long-mode, but does it in incorrect way. Note that the assertion is not
enabled unless the code is debugged by defining MMU_DEBUG.
Signed-off-by: Nadav Amit <namit@cs.technion.ac.il> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
kvm: fix excessive pages un-pinning in kvm_iommu_map error path.
The third parameter of kvm_unpin_pages() when called from
kvm_iommu_map_pages() is wrong, it should be the number of pages to un-pin
and not the page size.
This error was facilitated with an inconsistent API: kvm_pin_pages() takes
a size, but kvn_unpin_pages() takes a number of pages, so fix the problem
by matching the two.
This was introduced by commit 350b8bd ("kvm: iommu: fix the third parameter
of kvm_iommu_put_pages (CVE-2014-3601)"), which fixes the lack of
un-pinning for pages intended to be un-pinned (i.e. memory leak) but
unfortunately potentially aggravated the number of pages we un-pin that
should have stayed pinned. As far as I understand though, the same
practical mitigations apply.
This issue was found during review of Red Hat 6.6 patches to prepare
Ksplice rebootless updates.
Thanks to Vegard for his time on a late Friday evening to help me in
understanding this code.
Nadav Amit [Mon, 13 Oct 2014 10:04:14 +0000 (13:04 +0300)]
KVM: x86: PREFETCH and HINT_NOP should have SrcMem flag
The decode phase of the x86 emulator assumes that every instruction with the
ModRM flag, and which can be used with RIP-relative addressing, has either
SrcMem or DstMem. This is not the case for several instructions - prefetch,
hint-nop and clflush.
Adding SrcMem|NoAccess for prefetch and hint-nop and SrcMem for clflush.
This fixes CVE-2014-8480.
Fixes: 41061cdb98a0bec464278b4db8e894a3121671f5 Cc: stable@vger.kernel.org Signed-off-by: Nadav Amit <namit@cs.technion.ac.il> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Nadav Amit [Mon, 13 Oct 2014 10:04:13 +0000 (13:04 +0300)]
KVM: x86: Emulator does not decode clflush well
Currently, all group15 instructions are decoded as clflush (e.g., mfence,
xsave). In addition, the clflush instruction requires no prefix (66/f2/f3)
would exist. If prefix exists it may encode a different instruction (e.g.,
clflushopt).
Creating a group for clflush, and different group for each prefix.
This has been the case forever, but the next patch needs the cflush group
in order to fix a bug introduced in 3.17.
Fixes: 41061cdb98a0bec464278b4db8e894a3121671f5 Cc: stable@vger.kernel.org Signed-off-by: Nadav Amit <namit@cs.technion.ac.il> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Paolo Bonzini [Thu, 23 Oct 2014 12:54:14 +0000 (14:54 +0200)]
KVM: emulate: avoid accessing NULL ctxt->memopp
A failure to decode the instruction can cause a NULL pointer access.
This is fixed simply by moving the "done" label as close as possible
to the return.
This fixes CVE-2014-8481.
Reported-by: Andy Lutomirski <luto@amacapital.net> Cc: stable@vger.kernel.org Fixes: 41061cdb98a0bec464278b4db8e894a3121671f5 Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Ralf Baechle [Fri, 24 Oct 2014 11:27:37 +0000 (13:27 +0200)]
MIPS: SEAD3: Nuke PIC32 I2C driver.
A platform driver for which nothing ever registers the corresponding
platform device.
Also it was driving the same hardware as sead3-i2c-drv.c so redundant
anyway and couldn't co-exist with that driver because each of them was
using a private spinlock to protect access to the same hardware
resources.
This also fixes a randconfig problem:
arch/mips/mti-sead3/sead3-pic32-i2c-drv.c: In function 'i2c_platform_probe':
arch/mips/mti-sead3/sead3-pic32-i2c-drv.c:345:2: error: implicit declaration of
function 'i2c_add_numbered_adapter' [-Werror=implicit-function-declaration]
ret = i2c_add_numbered_adapter(&priv->adap);
^
arch/mips/mti-sead3/sead3-pic32-i2c-drv.c: In function
'i2c_platform_remove':
arch/mips/mti-sead3/sead3-pic32-i2c-drv.c:361:2: error: implicit declaration
of function 'i2c_del_adapter' [-Werror=implicit-function-declaration]
i2c_del_adapter(&priv->adap);
Nadav Amit [Thu, 2 Oct 2014 22:10:04 +0000 (01:10 +0300)]
KVM: x86: Decoding guest instructions which cross page boundary may fail
Once an instruction crosses a page boundary, the size read from the second page
disregards the common case that part of the operand resides on the first page.
As a result, fetch of long insturctions may fail, and thereby cause the
decoding to fail as well.
Cc: stable@vger.kernel.org Fixes: 5cfc7e0f5e5e1adf998df94f8e36edaf5d30d38e Signed-off-by: Nadav Amit <namit@cs.technion.ac.il> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
KVM_EXIT_UNKNOWN is a kvm bug, we don't really know whether it was
triggered by a priveledged application. Let's not kill the guest: WARN
and inject #UD instead.
Cc: stable@vger.kernel.org Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Petr Matousek [Tue, 23 Sep 2014 18:22:30 +0000 (20:22 +0200)]
kvm: vmx: handle invvpid vm exit gracefully
On systems with invvpid instruction support (corresponding bit in
IA32_VMX_EPT_VPID_CAP MSR is set) guest invocation of invvpid
causes vm exit, which is currently not handled and results in
propagation of unknown exit to userspace.
Fix this by installing an invvpid vm exit handler.
This is CVE-2014-3646.
Cc: stable@vger.kernel.org Signed-off-by: Petr Matousek <pmatouse@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Nadav Amit [Thu, 18 Sep 2014 19:39:39 +0000 (22:39 +0300)]
KVM: x86: Handle errors when RIP is set during far jumps
Far jmp/call/ret may fault while loading a new RIP. Currently KVM does not
handle this case, and may result in failed vm-entry once the assignment is
done. The tricky part of doing so is that loading the new CS affects the
VMCS/VMCB state, so if we fail during loading the new RIP, we are left in
unconsistent state. Therefore, this patch saves on 64-bit the old CS
descriptor and restores it if loading RIP failed.
This fixes CVE-2014-3647.
Cc: stable@vger.kernel.org Signed-off-by: Nadav Amit <namit@cs.technion.ac.il> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Nadav Amit [Thu, 18 Sep 2014 19:39:38 +0000 (22:39 +0300)]
KVM: x86: Emulator fixes for eip canonical checks on near branches
Before changing rip (during jmp, call, ret, etc.) the target should be asserted
to be canonical one, as real CPUs do. During sysret, both target rsp and rip
should be canonical. If any of these values is noncanonical, a #GP exception
should occur. The exception to this rule are syscall and sysenter instructions
in which the assigned rip is checked during the assignment to the relevant
MSRs.
This patch fixes the emulator to behave as real CPUs do for near branches.
Far branches are handled by the next patch.
This fixes CVE-2014-3647.
Cc: stable@vger.kernel.org Signed-off-by: Nadav Amit <namit@cs.technion.ac.il> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Andy Honig [Wed, 27 Aug 2014 21:42:54 +0000 (14:42 -0700)]
KVM: x86: Improve thread safety in pit
There's a race condition in the PIT emulation code in KVM. In
__kvm_migrate_pit_timer the pit_timer object is accessed without
synchronization. If the race condition occurs at the wrong time this
can crash the host kernel.
This fixes CVE-2014-3611.
Cc: stable@vger.kernel.org Signed-off-by: Andrew Honig <ahonig@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Andy Honig [Wed, 27 Aug 2014 18:16:44 +0000 (11:16 -0700)]
KVM: x86: Prevent host from panicking on shared MSR writes.
The previous patch blocked invalid writes directly when the MSR
is written. As a precaution, prevent future similar mistakes by
gracefulling handle GPs caused by writes to shared MSRs.
Cc: stable@vger.kernel.org Signed-off-by: Andrew Honig <ahonig@google.com>
[Remove parts obsoleted by Nadav's patch. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Nadav Amit [Tue, 16 Sep 2014 00:24:05 +0000 (03:24 +0300)]
KVM: x86: Check non-canonical addresses upon WRMSR
Upon WRMSR, the CPU should inject #GP if a non-canonical value (address) is
written to certain MSRs. The behavior is "almost" identical for AMD and Intel
(ignoring MSRs that are not implemented in either architecture since they would
anyhow #GP). However, IA32_SYSENTER_ESP and IA32_SYSENTER_EIP cause #GP if
non-canonical address is written on Intel but not on AMD (which ignores the top
32-bits).
Accordingly, this patch injects a #GP on the MSRs which behave identically on
Intel and AMD. To eliminate the differences between the architecutres, the
value which is written to IA32_SYSENTER_ESP and IA32_SYSENTER_EIP is turned to
canonical value before writing instead of injecting a #GP.
Some references from Intel and AMD manuals:
According to Intel SDM description of WRMSR instruction #GP is expected on
WRMSR "If the source register contains a non-canonical address and ECX
specifies one of the following MSRs: IA32_DS_AREA, IA32_FS_BASE, IA32_GS_BASE,
IA32_KERNEL_GS_BASE, IA32_LSTAR, IA32_SYSENTER_EIP, IA32_SYSENTER_ESP."
According to AMD manual instruction manual:
LSTAR/CSTAR (SYSCALL): "The WRMSR instruction loads the target RIP into the
LSTAR and CSTAR registers. If an RIP written by WRMSR is not in canonical
form, a general-protection exception (#GP) occurs."
IA32_GS_BASE and IA32_FS_BASE (WRFSBASE/WRGSBASE): "The address written to the
base field must be in canonical form or a #GP fault will occur."
IA32_KERNEL_GS_BASE (SWAPGS): "The address stored in the KernelGSbase MSR must
be in canonical form."
This patch fixes CVE-2014-3610.
Cc: stable@vger.kernel.org Signed-off-by: Nadav Amit <namit@cs.technion.ac.il> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Olof Johansson [Fri, 24 Oct 2014 04:05:45 +0000 (21:05 -0700)]
Merge tag 'socfpga_fixes_for_3.18' of git://git.rocketboards.org/linux-socfpga-next into fixes
Merge "SOCFPGA fixes for 3.18" from Dinh Nguyen:
These patches fixes an SMP and SDMMC driver hang during boot up on the
SOCFPGA platform.
Patch "arm: socfpga: fix fetching cpu1start_addr for SMP" fixes the SMP
trampoline code in order for CPU1 to correctly fetch it's cpu1start_addr.
Patch "ARM: dts: socfpga: rename gpio nodes" renames that GPIO node in order
to allow a standard way of specifying status="okay" in the board DTS file.
Patch "ARM: dts: socfpga: Fix SD card detect" fixes a SDMMC driver hang
during boot. The reason for the hang was the deferred probe of the SDMMC
driver was waiting for the GPIO resource that would never come.
Patch "ARM: dts: socfpga: Add a 3.3V fixed regulator node" adds a fixed
regulator node for the SDMMC driver to use.
* tag 'socfpga_fixes_for_3.18' of git://git.rocketboards.org/linux-socfpga-next:
ARM: dts: socfpga: Add a 3.3V fixed regulator node
ARM: dts: socfpga: Fix SD card detect
ARM: dts: socfpga: rename gpio nodes
arm: socfpga: fix fetching cpu1start_addr for SMP
Olof Johansson [Fri, 24 Oct 2014 04:02:49 +0000 (21:02 -0700)]
Merge tag 'at91-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nferre/linux-at91 into fixes
Merge "at91: fixes for v3.18 #1" from Nicholas Ferre:
First AT91 fixes for 3.18:
- one more MAINTAINERS entry for the SSC driver
- a fix for the newly introduced power/reset driver
- a fix on at91sam9263 USB due to PLLB misconfiguration
* tag 'at91-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nferre/linux-at91:
ARM: at91/dt: sam9263: fix PLLB frequencies
power: reset: at91-reset: fix power down register
MAINTAINERS: add atmel ssc driver maintainer entry
Al Viro [Thu, 23 Oct 2014 17:26:21 +0000 (13:26 -0400)]
fix inode leaks on d_splice_alias() failure exits
d_splice_alias() callers expect it to either stash the inode reference
into a new alias, or drop the inode reference. That makes it possible
to just return d_splice_alias() result from ->lookup() instance, without
any extra housekeeping required.
Unfortunately, that should include the failure exits. If d_splice_alias()
returns an error, it leaves the dentry it has been given negative and
thus it *must* drop the inode reference. Easily fixed, but it goes way
back and will need backporting.
Cc: stable@vger.kernel.org Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Markos Chandras [Mon, 20 Oct 2014 08:39:31 +0000 (09:39 +0100)]
MIPS: ftrace: Fix a microMIPS build problem
Code before the .fixup section needs to have the .insn directive.
This has no side effects on MIPS32/64 but it affects the way microMIPS
loads the address for the return label.
Fixes the following build problem:
mips-linux-gnu-ld: arch/mips/built-in.o: .fixup+0x4a0: Unsupported jump between
ISA modes; consider recompiling with interlinking enabled.
mips-linux-gnu-ld: final link failed: Bad value
Makefile:819: recipe for target 'vmlinux' failed
The fix is similar to 1658f914ff91c3bf ("MIPS: microMIPS:
Disable LL/SC and fix linker bug.")
Miklos Szeredi [Thu, 23 Oct 2014 22:14:39 +0000 (00:14 +0200)]
fs: limit filesystem stacking depth
Add a simple read-only counter to super_block that indicates how deep this
is in the stack of filesystems. Previously ecryptfs was the only stackable
filesystem and it explicitly disallowed multiple layers of itself.
Overlayfs, however, can be stacked recursively and also may be stacked
on top of ecryptfs or vice versa.
To limit the kernel stack usage we must limit the depth of the
filesystem stack. Initially the limit is set to 2.
Erez Zadok [Thu, 23 Oct 2014 22:14:38 +0000 (00:14 +0200)]
overlayfs: implement show_options
This is useful because of the stacking nature of overlayfs. Users like to
find out (via /proc/mounts) which lower/upper directory were used at mount
time.
AV: even failing ovl_parse_opt() could've done some kstrdup()
AV: failure of ovl_alloc_entry() should end up with ENOMEM, not EINVAL
Andy Whitcroft [Thu, 23 Oct 2014 22:14:38 +0000 (00:14 +0200)]
overlayfs: add statfs support
Add support for statfs to the overlayfs filesystem. As the upper layer
is the target of all write operations assume that the space in that
filesystem is the space in the overlayfs. There will be some inaccuracy as
overwriting a file will copy it up and consume space we were not expecting,
but it is better than nothing.
Use the upper layer dentry and mount from the overlayfs root inode,
passing the statfs call to that filesystem.
Signed-off-by: Andy Whitcroft <apw@canonical.com> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Miklos Szeredi [Thu, 23 Oct 2014 22:14:38 +0000 (00:14 +0200)]
overlay filesystem
Overlayfs allows one, usually read-write, directory tree to be
overlaid onto another, read-only directory tree. All modifications
go to the upper, writable layer.
This type of mechanism is most often used for live CDs but there's a
wide variety of other uses.
The implementation differs from other "union filesystem"
implementations in that after a file is opened all operations go
directly to the underlying, lower or upper, filesystems. This
simplifies the implementation and allows native performance in these
cases.
The dentry tree is duplicated from the underlying filesystems, this
enables fast cached lookups without adding special support into the
VFS. This uses slightly more memory than union mounts, but dentries
are relatively small.
Currently inodes are duplicated as well, but it is a possible
optimization to share inodes for non-directories.
Opening non directories results in the open forwarded to the
underlying filesystem. This makes the behavior very similar to union
mounts (with the same limitations vs. fchmod/fchown on O_RDONLY file
descriptors).
Usage:
mount -t overlayfs overlayfs -olowerdir=/lower,upperdir=/upper/upper,workdir=/upper/work /overlay
The following cotributions have been folded into this patch:
Neil Brown <neilb@suse.de>:
- minimal remount support
- use correct seek function for directories
- initialise is_real before use
- rename ovl_fill_cache to ovl_dir_read
Felix Fietkau <nbd@openwrt.org>:
- fix a deadlock in ovl_dir_read_merged
- fix a deadlock in ovl_remove_whiteouts
Erez Zadok <ezk@fsl.cs.sunysb.edu>
- fix cleanup after WARN_ON
Sedat Dilek <sedat.dilek@googlemail.com>
- fix up permission to confirm to new API
Robin Dong <hao.bigrat@gmail.com>
- fix possible leak in ovl_new_inode
- create new inode in ovl_link
Andy Whitcroft <apw@canonical.com>
- switch to __inode_permission()
- copy up i_uid/i_gid from the underlying inode
AV:
- ovl_copy_up_locked() - dput(ERR_PTR(...)) on two failure exits
- ovl_clear_empty() - one failure exit forgetting to do unlock_rename(),
lack of check for udir being the parent of upper, dropping and regaining
the lock on udir (which would require _another_ check for parent being
right).
- bogus d_drop() in copyup and rename [fix from your mail]
- copyup/remove and copyup/rename races [fix from your mail]
- ovl_dir_fsync() leaving ERR_PTR() in ->realfile
- ovl_entry_free() is pointless - it's just a kfree_rcu()
- fold ovl_do_lookup() into ovl_lookup()
- manually assigning ->d_op is wrong. Just use ->s_d_op.
[patches picked from Miklos]:
* copyup/remove and copyup/rename races
* bogus d_drop() in copyup and rename
Also thanks to the following people for testing and reporting bugs:
Jordi Pujol <jordipujolp@gmail.com>
Andy Whitcroft <apw@canonical.com>
Michal Suchanek <hramrach@centrum.cz>
Felix Fietkau <nbd@openwrt.org>
Erez Zadok <ezk@fsl.cs.sunysb.edu>
Randy Dunlap <rdunlap@xenotime.net>
Miklos Szeredi [Thu, 23 Oct 2014 22:14:37 +0000 (00:14 +0200)]
shmem: support RENAME_WHITEOUT
Allocate a dentry, initialize it with a whiteout and hash it in the place
of the old dentry. Later the old dentry will be moved away and the
whiteout will remain.
Miklos Szeredi [Thu, 23 Oct 2014 22:14:37 +0000 (00:14 +0200)]
ext4: support RENAME_WHITEOUT
Add whiteout support to ext4_rename(). A whiteout inode (chrdev/0,0) is
created before the rename takes place. The whiteout inode is added to the
old entry instead of deleting it.
Linus Torvalds [Thu, 23 Oct 2014 22:04:27 +0000 (15:04 -0700)]
Merge tag 'remove-weak-declarations' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci
Pull weak function declaration removal from Bjorn Helgaas:
"The "weak" attribute is commonly used for the default version of a
function, where an architecture can override it by providing a strong
version.
Some header file declarations included the "weak" attribute. That's
error-prone because it causes every implementation to be weak, with no
strong version at all, and the linker chooses one based on link order.
What we want is the "weak" attribute only on the *definition* of the
default implementation. These changes remove "weak" from the
declarations, leaving it on the default definitions"
* tag 'remove-weak-declarations' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci:
uprobes: Remove "weak" from function declarations
memory-hotplug: Remove "weak" from memory_block_size_bytes() declaration
kgdb: Remove "weak" from kgdb_arch_pc() declaration
ARC: kgdb: generic kgdb_arch_pc() suffices
vmcore: Remove "weak" from function declarations
clocksource: Remove "weak" from clocksource_default_clock() declaration
x86, intel-mid: Remove "weak" from function declarations
audit: Remove "weak" from audit_classify_compat_syscall() declaration
Linus Torvalds [Thu, 23 Oct 2014 21:45:09 +0000 (14:45 -0700)]
Merge branch 'x86-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 EFI updates from Peter Anvin:
"This patchset falls under the "maintainers that grovel" clause in the
v3.18-rc1 announcement. We had intended to push it late in the merge
window since we got it into the -tip tree relatively late.
Many of these are relatively simple things, but there are a couple of
key bits, especially Ard's and Matt's patches"
* 'x86-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (24 commits)
rtc: Disable EFI rtc for x86
efi: rtc-efi: Export platform:rtc-efi as module alias
efi: Delete the in_nmi() conditional runtime locking
efi: Provide a non-blocking SetVariable() operation
x86/efi: Adding efi_printks on memory allocationa and pci.reads
x86/efi: Mark initialization code as such
x86/efi: Update comment regarding required phys mapped EFI services
x86/efi: Unexport add_efi_memmap variable
x86/efi: Remove unused efi_call* macros
efi: Resolve some shadow warnings
arm64: efi: Format EFI memory type & attrs with efi_md_typeattr_format()
ia64: efi: Format EFI memory type & attrs with efi_md_typeattr_format()
x86: efi: Format EFI memory type & attrs with efi_md_typeattr_format()
efi: Introduce efi_md_typeattr_format()
efi: Add macro for EFI_MEMORY_UCE memory attribute
x86/efi: Clear EFI_RUNTIME_SERVICES if failing to enter virtual mode
arm64/efi: Do not enter virtual mode if booting with efi=noruntime or noefi
arm64/efi: uefi_init error handling fix
efi: Add kernel param efi=noruntime
lib: Add a generic cmdline parse function parse_option_str
...
* pm-cpuidle:
cpuidle: powernv: Populate cpuidle state details by querying the device-tree
* pm-cpufreq:
intel_pstate: Correct BYT VID values.
intel_pstate: Fix BYT frequency reporting
intel_pstate: Don't lose sysfs settings during cpu offline
cpufreq: intel_pstate: Reflect current no_turbo state correctly
cpufreq: expose scaling_cur_freq sysfs file for set_policy() drivers
cpufreq: intel_pstate: Fix setting max_perf_pct in performance policy
cpufreq: cpufreq-dt: adjust message related to regulators
cpufreq: cpufreq-dt: extend with platform_data
cpufreq: allow driver-specific data
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