| Commit message (Collapse) | Author | Age |
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versions
The core and the cluster sleep state entry latencies can't be same as
cluster sleep involves more work compared to core level e.g. shared
cache maintenance.
Experiments have shown on an average about 100us more latency for the
cluster sleep state compared to the core level sleep. This patch fixes
the entry latency for the cluster sleep state.
Fixes: 28e10a8f3a03 ("arm64: dts: juno: Add idle-states to device tree")
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: "Jon Medhurst (Tixy)" <tixy@linaro.org>
Reviewed-by: Liviu Dudau <Liviu.Dudau@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: Change-Id: I7b2d81fa66f8ce8b229457cfefff06e9edd545c7
(arm64: dts: juno: Add idle-states to device tree)
(cherry picked from commit 909e481e2467f202b97d42beef246e8829416a85)
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
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By default appended kernel image is Image.gz-dtb.
New config option BUILD_ARM64_APPENDED_KERNEL_IMAGE_NAME
allows to choose between Image.gz-dtb and Image-dtb.
Change-Id: I1c71b85136f1beeb61782e4646820718c1ccd7e4
Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>
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(cherry pick from commit b6d081bddf397026575a437b603b118dff2606ff)
The vm_special_mapping spec which is used for aarch32 vectors page is
never modified, so mark it as const.
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Bug: 20045882
Bug: 19198045
Change-Id: If1afd11bfeefee45a2b96634b18143937a773a14
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(cherry pick from commit 1aed28f94ce6c1f6c24bcbbd5fcd749b55f65e9e)
It is not needed after booting, this patch moves the alloc_vectors_page
function to the __init section.
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Bug: 20045882
Bug: 19198045
Change-Id: I1d7b89f9e20890b18e77c8752f1eef33d721ea81
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(cherry pick from commit 49eea433b326a0ac5c7c941a011b2c65990bd19b)
So far the arm64 clock_gettime() vDSO implementation only supported
the following clocks, falling back to the syscall for the others:
- CLOCK_REALTIME{,_COARSE}
- CLOCK_MONOTONIC{,_COARSE}
This patch adds support for the CLOCK_MONOTONIC_RAW clock, taking
advantage of the recent refactoring of the vDSO time functions. Like
the non-_COARSE clocks, this only works when the "arch_sys_counter"
clocksource is in use (allowing us to read the current time from the
virtual counter register), otherwise we also have to fall back to the
syscall.
Most of the data is shared with CLOCK_MONOTONIC, and the algorithm is
similar. The reference implementation in kernel/time/timekeeping.c
shows that:
- CLOCK_MONOTONIC = tk->wall_to_monotonic + tk->xtime_sec +
timekeeping_get_ns(&tk->tkr_mono)
- CLOCK_MONOTONIC_RAW = tk->raw_time + timekeeping_get_ns(&tk->tkr_raw)
- tkr_mono and tkr_raw are identical (in particular, same
clocksource), except these members:
* mult (only mono's multiplier is NTP-adjusted)
* xtime_nsec (always 0 for raw)
Therefore, tk->raw_time and tkr_raw->mult are now also stored in the
vDSO data page.
Cc: Ali Saidi <ali.saidi@arm.com>
Signed-off-by: Kevin Brodsky <kevin.brodsky@arm.com>
Reviewed-by: Dave Martin <dave.martin@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Bug: 20045882
Bug: 19198045
Change-Id: I854adcc1192757a1ac40662e85d466ca709d0682
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(cherry pick from commit b33f491f5a9aaf171b7de0f905362eb0314af478)
Time functions are directly implemented in assembly in arm64, and it
is desirable to keep it this way for performance reasons (everything
fits in registers, so that the stack is not used at all). However, the
current implementation is quite difficult to read and understand (even
considering it's assembly). Additionally, due to the structure of
__kernel_clock_gettime, which heavily uses conditional branches to
share code between the different clocks, it is difficult to support a
new clock without making the branches even harder to follow.
This commit completely refactors the structure of clock_gettime (and
gettimeofday along the way) while keeping exactly the same algorithms.
We no longer try to share code; instead, macros provide common
operations. This new approach comes with a number of advantages:
- In clock_gettime, clock implementations are no longer interspersed,
making them much more readable. Additionally, macros only use
registers passed as arguments or reserved with .req, this way it is
easy to make sure that registers are properly allocated. To avoid a
large number of branches in a given execution path, a jump table is
used; a normal execution uses 3 unconditional branches.
- __do_get_tspec has been replaced with 2 macros (get_ts_clock_mono,
get_clock_shifted_nsec) and explicit loading of data from the vDSO
page. Consequently, clock_gettime and gettimeofday are now leaf
functions, and saving x30 (lr) is no longer necessary.
- Variables protected by tb_seq_count are now loaded all at once,
allowing to merge the seqcnt_read macro into seqcnt_check.
- For CLOCK_REALTIME_COARSE, removed an unused load of the wall to
monotonic timespec.
- For CLOCK_MONOTONIC_COARSE, removed a few shift instructions.
Obviously, the downside of sharing less code is an increase in code
size. However since the vDSO has its own code page, this does not
really matter, as long as the size of the DSO remains below 4 kB. For
now this should be all right:
Before After
vdso.so size (B) 2776 3000
Signed-off-by: Kevin Brodsky <kevin.brodsky@arm.com>
Reviewed-by: Dave Martin <dave.martin@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Bug: 20045882
Bug: 19198045
Change-Id: I0a0036c54419ee561efe3aad97489e7748ddc59e
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(cherry pick from commit a66649dab35033bd67988670fa60c268b0444cda)
arm64/kernel/{vdso,signal}.c include vdso-offsets.h, as well as any
file that includes asm/vdso.h. Therefore, vdso-offsets.h must be
generated before these files are compiled.
The current rules in arm64/kernel/Makefile do not actually enforce
this, because even though $(obj)/vdso is listed as a prerequisite for
vdso-offsets.h, this does not result in the intended effect of
building the vdso subdirectory (before all the other objects). As a
consequence, depending on the order in which the rules are followed,
vdso-offsets.h is updated or not before arm64/kernel/{vdso,signal}.o
are built. The current rules also impose an unnecessary dependency on
vdso-offsets.h for all arm64/kernel/*.o, resulting in unnecessary
rebuilds. This is made obvious when using make -j:
touch arch/arm64/kernel/vdso/gettimeofday.S && make -j$NCPUS arch/arm64/kernel
will sometimes result in none of arm64/kernel/*.o being
rebuilt, sometimes all of them, or even just some of them.
It is quite difficult to ensure that a header is generated before it
is used with recursive Makefiles by using normal rules. Instead,
arch-specific generated headers are normally built in the archprepare
recipe in the arch Makefile (see for instance arch/ia64/Makefile).
Unfortunately, asm-offsets.h is included in gettimeofday.S, and must
therefore be generated before vdso-offsets.h, which is not the case if
archprepare is used. For this reason, a rule run after archprepare has
to be used.
This commit adds rules in arm64/Makefile to build vdso-offsets.h
during the prepare step, ensuring that vdso-offsets.h is generated
before building anything. It also removes the now-unnecessary
dependencies on vdso-offsets.h in arm64/kernel/Makefile. Finally, it
removes the duplication of asm-offsets.h between arm64/kernel/vdso/
and include/generated/ and makes include/generated/vdso-offsets.h a
target in arm64/kernel/vdso/Makefile.
Cc: Will Deacon <will.deacon@arm.com>
Cc: Michal Marek <mmarek@suse.com>
Signed-off-by: Kevin Brodsky <kevin.brodsky@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Bug: 20045882
Bug: 19198045
Change-Id: Iaaf1c6d3c98287617fc7f63a736752f6597bc8d0
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EAS expects the energy model for the CPUs and cluster states to be
available in the DTB. The energy model data comes from previous versions.
Change-Id: I87535c8d802797361333929d809b43383bc8954b
(cherry picked from commit bf137f205f312a1814ae38f908ec7bdbdddeaa3e (LSK 4.4))
Signed-off-by: Chris Redpath <chris.redpath@arm.com>
Signed-off-by: Punit Agrawal <punit.agrawal@arm.com>
Signed-off-by: Jon Medhurst <tixy@linaro.org>
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This patch adds idle-states bindings data collected through a set of
benchmarking experiments (latency and energy consumption) on Juno
boards. Latencies data represents the worst case scenarios as required
by the DT idle-states bindings.
Change-Id: I7b2d81fa66f8ce8b229457cfefff06e9edd545c7
(cherry picked from commit 286896f43b0248960f69660159b507b23751b38a)
Signed-off-by: Jon Medhurst <tixy@linaro.org>
Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
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am: e83a28c521
Change-Id: I0e1de5d2d64401624e0cb37b9b92cb9941081869
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Change-Id: Icf907f5067fb6da5935ab0d3271df54b8d5df405
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poly_hash is part of the HEH (Hash-Encrypt-Hash) encryption mode,
proposed in Internet Draft
https://tools.ietf.org/html/draft-cope-heh-01. poly_hash is very
similar to GHASH; besides the swapping of the last two coefficients
which we opted to handle in the HEH template, poly_hash just uses a
different finite field representation. As with GHASH, poly_hash becomes
much faster and more secure against timing attacks when implemented
using carryless multiplication instructions instead of tables. This
patch adds an ARMv8-CE optimized version of poly_hash, based roughly on
the existing ARMv8-CE optimized version of GHASH.
Benchmark results are shown below, but note that the resistance to
timing attacks may be even more important than the performance gain.
poly_hash only:
poly_hash-generic:
1,000,000 setkey() takes 1185 ms
hashing is 328 MB/s
poly_hash-ce:
1,000,000 setkey() takes 8 ms
hashing is 1756 MB/s
heh(aes) with 4096-byte inputs (this is the ideal case, as the
improvement is less significant with smaller inputs):
encryption with "heh_base(cmac(aes-ce),poly_hash-generic,ecb-aes-ce)": 118 MB/s
decryption with "heh_base(cmac(aes-ce),poly_hash-generic,ecb-aes-ce)": 120 MB/s
encryption with "heh_base(cmac(aes-ce),poly_hash-ce,ecb-aes-ce)": 291 MB/s
decryption with "heh_base(cmac(aes-ce),poly_hash-ce,ecb-aes-ce)": 293 MB/s
Bug: 32508661
Signed-off-by: Eric Biggers <ebiggers@google.com>
Change-Id: I621ec0e1115df7e6f5cbd7e864a4a9d8d2e94cf2
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ECB modes don't use an initialization vector. The kernel
/proc/crypto interface doesn't reflect this properly.
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
(cherry picked from bee038a4bd2efe8188cc80dfdad706a9abe568ad)
Signed-off-by: Eric Biggers <ebiggers@google.com>
Change-Id: Ief9558d2b41be58a2d845d2033a141b5ef7b585f
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(cherry picked from commit 0ddb8e0b784ba034f3096d5a54684d0d73155e2a)
Since, arm64 can support all offset within a double word limit. Therefore,
now support other lengths within that range as well.
Signed-off-by: Pratyush Anand <panand@redhat.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Pavel Labath <labath@google.com>
Change-Id: Ibcb263a3903572336ccbf96e0180d3990326545a
Bug: 30919905
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(cherry picked from commit fdfeff0f9e3d9be2b68fa02566017ffc581ae17b)
Arm64 hardware does not always report a watchpoint hit address that
matches one of the watchpoints set. It can also report an address
"near" the watchpoint if a single instruction access both watched and
unwatched addresses. There is no straight-forward way, short of
disassembling the offending instruction, to map that address back to
the watchpoint.
Previously, when the hardware reported a watchpoint hit on an address
that did not match our watchpoint (this happens in case of instructions
which access large chunks of memory such as "stp") the process would
enter a loop where we would be continually resuming it (because we did
not recognise that watchpoint hit) and it would keep hitting the
watchpoint again and again. The tracing process would never get
notified of the watchpoint hit.
This commit fixes the problem by looking at the watchpoints near the
address reported by the hardware. If the address does not exactly match
one of the watchpoints we have set, it attributes the hit to the
nearest watchpoint we have. This heuristic is a bit dodgy, but I don't
think we can do much more, given the hardware limitations.
Signed-off-by: Pavel Labath <labath@google.com>
[panand: reworked to rebase on his patches]
Signed-off-by: Pratyush Anand <panand@redhat.com>
[will: use __ffs instead of ffs - 1]
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Pavel Labath <labath@google.com>
[pavel: trivial fixup in hw_breakpoint.c:watchpoint_handler]
Change-Id: I714dfaa3947d89d89a9e9a1ea84914d44ba0faa3
Bug: 30919905
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ARM64 hardware supports watchpoint at any double word aligned address.
However, it can select any consecutive bytes from offset 0 to 7 from that
base address. For example, if base address is programmed as 0x420030 and
byte select is 0x1C, then access of 0x420032,0x420033 and 0x420034 will
generate a watchpoint exception.
Currently, we do not have such modularity. We can only program byte,
halfword, word and double word access exception from any base address.
This patch adds support to overcome above limitations.
Signed-off-by: Pratyush Anand <panand@redhat.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Pavel Labath <labath@google.com>
Change-Id: I28b1ca63f63182c10c3d6b6b3bacf6c56887ddbe
Bug: 30919905
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This is the 4.4.48 stable release
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This is the 4.4.45 stable release
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This is the 4.4.43 stable release
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* Issue: After da643dc .enable expects an int
-> Change cpu_enable_uao protype to int
Change-Id: I581a1afd13cd90637e6a7a315ede2af8950b401f
Signed-off-by: Luca Stefani <luca.stefani.ge1@gmail.com>
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Commit 4b65a5db3627 ("arm64: Introduce uaccess_{disable,enable}
functionality based on TTBR0_EL1") added conditional user access
enable/disable. Unfortunately, a typo prevents the PAN bit from being
cleared for user access functions.
Restore the PAN functionality by adding the missing '!'.
Fixes: b65a5db3627 ("arm64: Introduce uaccess_{disable,enable} functionality based on TTBR0_EL1")
Reported-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Bug: 31432001
Change-Id: If61cb6cc756affc7df7fa06213723a8b96eb1e80
(cherry picked from commit 75037120e62b58c536999eb23d70cfcb6d6c0bcc)
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
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This patch adds the Kconfig option to enable support for TTBR0 PAN
emulation. The option is default off because of a slight performance hit
when enabled, caused by the additional TTBR0_EL1 switching during user
access operations or exception entry/exit code.
Cc: Will Deacon <will.deacon@arm.com>
Cc: James Morse <james.morse@arm.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Bug: 31432001
Change-Id: I2f0b5f332e3c56ea0453ff69826525dec49f034b
(cherry picked from commit ba42822af1c287f038aa550f3578c61c212a892e)
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
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Privcmd calls are issued by the userspace. The kernel needs to enable
access to TTBR0_EL1 as the hypervisor would issue stage 1 translations
to user memory via AT instructions. Since AT instructions are not
affected by the PAN bit (ARMv8.1), we only need the explicit
uaccess_enable/disable if the TTBR0 PAN option is enabled.
Reviewed-by: Julien Grall <julien.grall@arm.com>
Acked-by: Stefano Stabellini <sstabellini@kernel.org>
Cc: Will Deacon <will.deacon@arm.com>
Cc: James Morse <james.morse@arm.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Bug: 31432001
Change-Id: I64d827923d869c1868702c8a18efa99ea91d3151
(cherry picked from commit 9cf09d68b89ae5fe0261dcc69464bcc676900af6)
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
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enabled
When TTBR0_EL1 is set to the reserved page, an erroneous kernel access
to user space would generate a translation fault. This patch adds the
checks for the software-set PSR_PAN_BIT to emulate a permission fault
and report it accordingly.
Cc: Will Deacon <will.deacon@arm.com>
Cc: James Morse <james.morse@arm.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Bug: 31432001
Change-Id: I87e48f6075f84878e4d26d4fadf6eaac49d2cb4e
(cherry picked from commit 786889636ad75296c213547d1ca656af4c59f390)
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
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When the TTBR0 PAN feature is enabled, the kernel entry points need to
disable access to TTBR0_EL1. The PAN status of the interrupted context
is stored as part of the saved pstate, reusing the PSR_PAN_BIT (22).
Restoring access to TTBR0_EL1 is done on exception return if returning
to user or returning to a context where PAN was disabled.
Context switching via switch_mm() must defer the update of TTBR0_EL1
until a return to user or an explicit uaccess_enable() call.
Special care needs to be taken for two cases where TTBR0_EL1 is set
outside the normal kernel context switch operation: EFI run-time
services (via efi_set_pgd) and CPU suspend (via cpu_(un)install_idmap).
Code has been added to avoid deferred TTBR0_EL1 switching as in
switch_mm() and restore the reserved TTBR0_EL1 when uninstalling the
special TTBR0_EL1.
User cache maintenance (user_cache_maint_handler and
__flush_cache_user_range) needs the TTBR0_EL1 re-instated since the
operations are performed by user virtual address.
This patch also removes a stale comment on the switch_mm() function.
Cc: Will Deacon <will.deacon@arm.com>
Cc: James Morse <james.morse@arm.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Bug: 31432001
Change-Id: I85a49f70e13b153b9903851edf56f6531c14e6de
(cherry picked from commit 39bc88e5e38e9b213bd7d833ce0df6ec029761ad)
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
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TTBR0_EL1
This patch adds the uaccess macros/functions to disable access to user
space by setting TTBR0_EL1 to a reserved zeroed page. Since the value
written to TTBR0_EL1 must be a physical address, for simplicity this
patch introduces a reserved_ttbr0 page at a constant offset from
swapper_pg_dir. The uaccess_disable code uses the ttbr1_el1 value
adjusted by the reserved_ttbr0 offset.
Enabling access to user is done by restoring TTBR0_EL1 with the value
from the struct thread_info ttbr0 variable. Interrupts must be disabled
during the uaccess_ttbr0_enable code to ensure the atomicity of the
thread_info.ttbr0 read and TTBR0_EL1 write. This patch also moves the
get_thread_info asm macro from entry.S to assembler.h for reuse in the
uaccess_ttbr0_* macros.
Cc: Will Deacon <will.deacon@arm.com>
Cc: James Morse <james.morse@arm.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Bug: 31432001
Change-Id: I54ada623160cb47f5762e0e39a5e84a75252dbfd
(cherry picked from commit 4b65a5db362783ab4b04ca1c1d2ad70ed9b0ba2a)
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
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asm macro
This patch takes the errata workaround code out of cpu_do_switch_mm into
a dedicated post_ttbr0_update_workaround macro which will be reused in a
subsequent patch.
Cc: Will Deacon <will.deacon@arm.com>
Cc: James Morse <james.morse@arm.com>
Cc: Kees Cook <keescook@chromium.org>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Bug: 31432001
Change-Id: I2b45b11ab7390c3545b9e162532109c1526bef14
(cherry picked from commit f33bcf03e6079668da6bf4eec4a7dcf9289131d0)
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
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macros
This patch moves the directly coded alternatives for turning PAN on/off
into separate uaccess_{enable,disable} macros or functions. The asm
macros take a few arguments which will be used in subsequent patches.
Note that any (unlikely) access that the compiler might generate between
uaccess_enable() and uaccess_disable(), other than those explicitly
specified by the user access code, will not be protected by PAN.
Cc: Will Deacon <will.deacon@arm.com>
Cc: James Morse <james.morse@arm.com>
Cc: Kees Cook <keescook@chromium.org>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Bug: 31432001
Change-Id: I75a410139d0756edab3210ee091fa5d047a22e04
(cherry picked from commit bd38967d406fb4f9fca67d612db71b5d74cfb0f5)
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
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In some cases, one side of an alternative sequence is simply a number of
NOPs used to balance the other side. Keeping track of this manually is
tedious, and the presence of large chains of NOPs makes the code more
painful to read than necessary.
To ameliorate matters, this patch adds a new alternative_else_nop_endif,
which automatically balances an alternative sequence with a trivial NOP
sled.
In many cases, we would like a NOP-sled in the default case, and
instructions patched in in the presence of a feature. To enable the NOPs
to be generated automatically for this case, this patch also adds a new
alternative_if, and updates alternative_else and alternative_endif to
work with either alternative_if or alternative_endif.
Cc: Andre Przywara <andre.przywara@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dave Martin <dave.martin@arm.com>
Cc: James Morse <james.morse@arm.com>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
[will: use new nops macro to generate nop sequences]
Signed-off-by: Will Deacon <will.deacon@arm.com>
Bug: 31432001
Change-Id: I28d8aae073e113048577c41cfe27c91215fb4cf3
(cherry picked from commit 792d47379f4d4c76692f1795f33d38582f8907fa)
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
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NOP sequences tend to get used for padding out alternative sections
and uarch-specific pipeline flushes in errata workarounds.
This patch adds macros for generating these sequences as both inline
asm blocks, but also as strings suitable for embedding in other asm
blocks directly.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Bug: 31432001
Change-Id: I7f82b677a065ede302a763d39ffcc3fef83f8fbe
(cherry picked from commit f99a250cb6a3b301b101b4c0f5fcb80593bba6dc)
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
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uaccess_* macros"
This reverts commit 23368b642deb01ac6ce668ec1dedfcc0cab25c71.
Bug: 31432001
Change-Id: Ia59e5fc75ef905b89d5f9194f1e762c1e5eff5bf
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
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specific asm macro"
This reverts commit 3b66929169de053042d47e482dd5748794756153.
Bug: 31432001
Change-Id: Ib38fcf553ca2077531cbf550fbaa75378a8723c5
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
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based on TTBR0_EL1"
This reverts commit 1911d36b27ba58ee18592df25b7ee636d4d4c41d.
Bug: 31432001
Change-Id: Iee77eed8454f379b948dbbaf65c105952ea30bef
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
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This reverts commit 5775ca34829caf0664c8ccc02fd0e93cb6022e0f.
Bug: 31432001
Change-Id: I9b07c2f01bc2bcfed51f60ab487034639f5e1960
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
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with PAN enabled"
This reverts commit 5dc2b7c7bb33138270ff9494be6cf334bd3d20e1.
Bug: 31432001
Change-Id: I384a9af199f502f8fa3ae3733db67a4c547dbd55
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
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This reverts commit 4dbc88bd2b6a74fd33483ee2593dcf2bd858eabe.
Bug: 31432001
Change-Id: I2c3d591a2c631e7ff02c0bcb91624735e8c12f0a
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
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This reverts commit 67cd3bda54dadba4f8892105adf9c2f3982bfa0a.
Bug: 31432001
Change-Id: I1e5836ce0b41b2262d95c5c4c49ace3b96ae0b1f
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
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ptep_set_access_flags
(Cherry picked from commit 0106d456c4cb1770253fefc0ab23c9ca760b43f7)
Commit 66dbd6e61a52 ("arm64: Implement ptep_set_access_flags() for
hardware AF/DBM") ensured that pte flags are updated atomically in the
face of potential concurrent, hardware-assisted updates. However, Alex
reports that:
| This patch breaks swapping for me.
| In the broken case, you'll see either systemd cpu time spike (because
| it's stuck in a page fault loop) or the system hang (because the
| application owning the screen is stuck in a page fault loop).
It turns out that this is because the 'dirty' argument to
ptep_set_access_flags is always 0 for read faults, and so we can't use
it to set PTE_RDONLY. The failing sequence is:
1. We put down a PTE_WRITE | PTE_DIRTY | PTE_AF pte
2. Memory pressure -> pte_mkold(pte) -> clear PTE_AF
3. A read faults due to the missing access flag
4. ptep_set_access_flags is called with dirty = 0, due to the read fault
5. pte is then made PTE_WRITE | PTE_DIRTY | PTE_AF | PTE_RDONLY (!)
6. A write faults, but pte_write is true so we get stuck
The solution is to check the new page table entry (as would be done by
the generic, non-atomic definition of ptep_set_access_flags that just
calls set_pte_at) to establish the dirty state.
Cc: <stable@vger.kernel.org> # 4.3+
Fixes: 66dbd6e61a52 ("arm64: Implement ptep_set_access_flags() for hardware AF/DBM")
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Reported-by: Alexander Graf <agraf@suse.de>
Tested-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Fixes: Change-Id: Id2a0b0d8eb6e7df6325ecb48b88b8401a5dd09e5
("UPSTREAM: arm64: Implement ptep_set_access_flags() for hardware AF/DBM")
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
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(Cherry picked from commit 282aa7051b0169991b34716f0f22d9c2f59c46c4)
The update to the accessed or dirty states for block mappings must be
done atomically on hardware with support for automatic AF/DBM. The
ptep_set_access_flags() function has been fixed as part of commit
66dbd6e61a52 ("arm64: Implement ptep_set_access_flags() for hardware
AF/DBM"). This patch brings pmdp_set_access_flags() in line with the pte
counterpart.
Fixes: 2f4b829c625e ("arm64: Add support for hardware updates of the access and dirty pte bits")
Cc: <stable@vger.kernel.org> # 4.4.x: 66dbd6e61a52: arm64: Implement ptep_set_access_flags() for hardware AF/DBM
Cc: <stable@vger.kernel.org> # 4.3+
Reviewed-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
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(Cherry picked from commit 911f56eeb87ee378f5e215469268a7a2f68a5a8a)
With hardware AF/DBM support, pmd modifications (transparent huge pages)
should be performed atomically using load/store exclusive. The initial
patches defined the get-and-clear function and __HAVE_ARCH_* macro
without the "huge" word, leaving the pmdp_huge_get_and_clear() to the
default, non-atomic implementation.
Fixes: 2f4b829c625e ("arm64: Add support for hardware updates of the access and dirty pte bits")
Cc: <stable@vger.kernel.org> # 4.3+
Reviewed-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
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(Cherry picked from commit 57efac2f7108e3255d0dfe512290c9896f4ed55f)
In spite of its name, CONFIG_DEBUG_RODATA is an important hardening feature
for production kernels, and distros all enable it by default in their
kernel configs. However, since enabling it used to result in more granular,
and thus less efficient kernel mappings, it is not enabled by default for
performance reasons.
However, since commit 2f39b5f91eb4 ("arm64: mm: Mark .rodata as RO"), the
various kernel segments (.text, .rodata, .init and .data) are already
mapped individually, and the only effect of setting CONFIG_DEBUG_RODATA is
that the existing .text and .rodata mappings are updated late in the boot
sequence to have their read-only attributes set, which means that any
performance concerns related to enabling CONFIG_DEBUG_RODATA are no longer
valid.
So from now on, make CONFIG_DEBUG_RODATA default to 'y'
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
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Bug: 31648368
Change-Id: I3715cc6474129ba2176be62ed2c0a7d09a6f2ac7
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This is the 4.4.37 stable release
Change-Id: Ic6753a5a223abc02c4fe5205642d4f904de2e5b8
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Change-Id: Ib7cd1ef722167905957623f65c3cc064e9d5c357
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Change-Id: I8c5ec371d8b612f6880b2428893bec89d7da71f6
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