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4227 commits
| Author | SHA1 | Message | Date | |
|---|---|---|---|---|
Linus Torvalds
|
4ae12d8bd9 |
Second round of Kbuild fixes for 7.0
- Split out .modinfo section from ELF_DETAILS macro, as that macro may be used in other areas that expect to discard .modinfo, breaking certain image layouts - Adjust genksyms parser to handle optional attributes in certain declarations, necessary after commit |
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Nathan Chancellor
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8678591b47
|
kbuild: Split .modinfo out from ELF_DETAILS
Commit |
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Vasily Gorbik
|
1623a554c6 |
s390/kexec: Disable stack protector in s390_reset_system()
s390_reset_system() calls set_prefix(0), which switches back to the
absolute lowcore. At that point the stack protector canary no longer
matches the canary from the lowcore the function was entered with, so
the stack check fails.
Mark s390_reset_system() __no_stack_protector. This is safe here since
its callers (__do_machine_kdump() and __do_machine_kexec()) are
effectively no-return and fall back to disabled_wait() on failure.
Fixes:
|
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Heiko Carstens
|
80f63fd09e |
s390/vtime: Use lockdep_assert_irqs_disabled() instead of BUG_ON()
Use lockdep_assert_irqs_disabled() instead of BUG_ON(). This avoids crashing the kernel, and generates better code if CONFIG_PROVE_LOCKING is disabled. Reviewed-by: Sven Schnelle <svens@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> |
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Heiko Carstens
|
e282ccd308 |
s390/vtime: Use __this_cpu_read() / get rid of READ_ONCE()
do_account_vtime() runs always with interrupts disabled, therefore use __this_cpu_read() instead of this_cpu_read() to get rid of a pointless preempt_disable() / preempt_enable() pair. Also there are no concurrent writers to the cpu time accounting fields in lowcore. Therefore get rid of READ_ONCE() usages. Reviewed-by: Sven Schnelle <svens@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> |
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Heiko Carstens
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d8b5cf9c63 |
s390/irq/idle: Remove psw bits early
Remove wait, io, external interrupt bits early in do_io_irq()/do_ext_irq() when previous context was idle. This saves one conditional branch and is closer to the original old assembly code. Reviewed-by: Sven Schnelle <svens@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> |
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Heiko Carstens
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257c14e5a1 |
s390/idle: Inline update_timer_idle()
Inline update_timer_idle() again to avoid an extra function call. This way the generated code is close to old assembler version again. Reviewed-by: Sven Schnelle <svens@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> |
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Heiko Carstens
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00d8b035eb |
s390/idle: Slightly optimize idle time accounting
Slightly optimize account_idle_time_irq() and update_timer_idle(): - Use fast single instruction __atomic64() primitives to update per cpu idle_time and idle_count, instead of READ_ONCE() / WRITE_ONCE() pairs - stcctm() is an inline assembly with a full memory barrier. This leads to a not necessary extra dereference of smp_cpu_mtid in update_timer_idle(). Avoid this and read smp_cpu_mtid into a variable - Use __this_cpu_add() instead of this_cpu_add() to avoid disabling / enabling of preemption several times in a loop in update_timer_idle(). Reviewed-by: Sven Schnelle <svens@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> |
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Heiko Carstens
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aefa6ec890 |
s390/idle: Add comment for non obvious code
Add a comment to update_timer_idle() which describes why wall time (not steal time) is added to steal_timer. This is not obvious and was reported by Frederic Weisbecker. Reported-by: Frederic Weisbecker <frederic@kernel.org> Closes: https://lore.kernel.org/all/aXEVM-04lj0lntMr@localhost.localdomain/ Reviewed-by: Sven Schnelle <svens@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> |
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Heiko Carstens
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dbc0fb3567 |
s390/vtime: Fix virtual timer forwarding
Since delayed accounting of system time [1] the virtual timer is
forwarded by do_account_vtime() but also vtime_account_kernel(),
vtime_account_softirq(), and vtime_account_hardirq(). This leads
to double accounting of system, guest, softirq, and hardirq time.
Remove accounting from the vtime_account*() family to restore old behavior.
There is only one user of the vtimer interface, which might explain
why nobody noticed this so far.
Fixes:
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Heiko Carstens
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0d785e2c32 |
s390/idle: Fix cpu idle exit cpu time accounting
With the conversion to generic entry [1] cpu idle exit cpu time accounting
was converted from assembly to C. This introduced an reversed order of cpu
time accounting.
On cpu idle exit the current accounting happens with the following call
chain:
-> do_io_irq()/do_ext_irq()
-> irq_enter_rcu()
-> account_hardirq_enter()
-> vtime_account_irq()
-> vtime_account_kernel()
vtime_account_kernel() accounts the passed cpu time since last_update_timer
as system time, and updates last_update_timer to the current cpu timer
value.
However the subsequent call of
-> account_idle_time_irq()
will incorrectly subtract passed cpu time from timer_idle_enter to the
updated last_update_timer value from system_timer. Then last_update_timer
is updated to a sys_enter_timer, which means that last_update_timer goes
back in time.
Subsequently account_hardirq_exit() will account too much cpu time as
hardirq time. The sum of all accounted cpu times is still correct, however
some cpu time which was previously accounted as system time is now
accounted as hardirq time, plus there is the oddity that last_update_timer
goes back in time.
Restore previous behavior by extracting cpu time accounting code from
account_idle_time_irq() into a new update_timer_idle() function and call it
before irq_enter_rcu().
Fixes:
|
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Kees Cook
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189f164e57 |
Convert remaining multi-line kmalloc_obj/flex GFP_KERNEL uses
Conversion performed via this Coccinelle script:
// SPDX-License-Identifier: GPL-2.0-only
// Options: --include-headers-for-types --all-includes --include-headers --keep-comments
virtual patch
@gfp depends on patch && !(file in "tools") && !(file in "samples")@
identifier ALLOC = {kmalloc_obj,kmalloc_objs,kmalloc_flex,
kzalloc_obj,kzalloc_objs,kzalloc_flex,
kvmalloc_obj,kvmalloc_objs,kvmalloc_flex,
kvzalloc_obj,kvzalloc_objs,kvzalloc_flex};
@@
ALLOC(...
- , GFP_KERNEL
)
$ make coccicheck MODE=patch COCCI=gfp.cocci
Build and boot tested x86_64 with Fedora 42's GCC and Clang:
Linux version 6.19.0+ (user@host) (gcc (GCC) 15.2.1 20260123 (Red Hat 15.2.1-7), GNU ld version 2.44-12.fc42) #1 SMP PREEMPT_DYNAMIC 1970-01-01
Linux version 6.19.0+ (user@host) (clang version 20.1.8 (Fedora 20.1.8-4.fc42), LLD 20.1.8) #1 SMP PREEMPT_DYNAMIC 1970-01-01
Signed-off-by: Kees Cook <kees@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Linus Torvalds
|
bf4afc53b7 |
Convert 'alloc_obj' family to use the new default GFP_KERNEL argument
This was done entirely with mindless brute force, using
git grep -l '\<k[vmz]*alloc_objs*(.*, GFP_KERNEL)' |
xargs sed -i 's/\(alloc_objs*(.*\), GFP_KERNEL)/\1)/'
to convert the new alloc_obj() users that had a simple GFP_KERNEL
argument to just drop that argument.
Note that due to the extreme simplicity of the scripting, any slightly
more complex cases spread over multiple lines would not be triggered:
they definitely exist, but this covers the vast bulk of the cases, and
the resulting diff is also then easier to check automatically.
For the same reason the 'flex' versions will be done as a separate
conversion.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
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Kees Cook
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69050f8d6d |
treewide: Replace kmalloc with kmalloc_obj for non-scalar types
This is the result of running the Coccinelle script from scripts/coccinelle/api/kmalloc_objs.cocci. The script is designed to avoid scalar types (which need careful case-by-case checking), and instead replace kmalloc-family calls that allocate struct or union object instances: Single allocations: kmalloc(sizeof(TYPE), ...) are replaced with: kmalloc_obj(TYPE, ...) Array allocations: kmalloc_array(COUNT, sizeof(TYPE), ...) are replaced with: kmalloc_objs(TYPE, COUNT, ...) Flex array allocations: kmalloc(struct_size(PTR, FAM, COUNT), ...) are replaced with: kmalloc_flex(*PTR, FAM, COUNT, ...) (where TYPE may also be *VAR) The resulting allocations no longer return "void *", instead returning "TYPE *". Signed-off-by: Kees Cook <kees@kernel.org> |
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Linus Torvalds
|
9806790115 |
s390 fixes for 7.0 merge window
- Make KEXEC_SIG available again for CONFIG_MODULES=n - The s390 topology code used to call rebuild_sched_domains() before common code scheduling domains were setup. This was silently ignored by common code, but now results in a warning. Address by avoiding the early call - Convert debug area lock from spinlock to raw spinlock to address lockdep warnings - The recent 3490 tape device driver rework resulted in a different device driver name, which is visible via sysfs for user space. This breaks at least one user space application. Change the device driver name back to its old name to fix this -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEECMNfWEw3SLnmiLkZIg7DeRspbsIFAmmYUo8ACgkQIg7DeRsp bsL+rw//f6AadV9X3tCPe/vaNdxQWkVtd1Ov+eKYkIohSFvghBo4+4c6qXlsc4jp Opedqs2+YUdx2/tR3nTPkfG/Nm49rGpB+i4CYAjBUlAjIN1czyUlvICJ6ZVQbpQt zR+I7Ej/QsBR0XMqbUfPNWMwbdZlW395kXNhCAKckbjM1M+Hezp9WZjuaQ1vWCUv wGXAUI+/fTgPKUu3nIQRw2JkG2M+IfFj3jkYMXTW8D8WzoqLXPwtjmjcDtTU/VDr otq97rDUd8MvNsxV5hX+T7nI0JQIFrdb32bCy0mhWhnvc7rHdewLfp5+793vKG/K DcOouXr/vJcPUhAUQI3ksREAwAEJV1phKeILXbbUhpkAZUQAozVG6+YrzMk/4VSW Zm6BGcOLVo0DQtn97I55gKSPFiNoCQwSdU+CcrbzA8aEDBMfxLFKBvh50sAx/0I3 zXbXYDjgPdqOKuyUprB8Y6PJTrCnHebXPGs2Kgl2XU3k4m61h/60EHIXe6w0ErM8 1hl8+Rdn4jmWDcAOFKTBpo8Y/o+WZVcNssPr4F7ArcjJTWmAtxWP3NQAux3UM2HW 3dOV6dcdbmndKSmKwtWrvMVv0GvcgWAp/NhjwKx37EovYLFJg4DqtiioqiOFjWKD 4gwIB8gKxbWjNSGq3cKTiH021iWoRIDoCeAFJWRdrH5xt7rxCWc= =7EJS -----END PGP SIGNATURE----- Merge tag 's390-7.0-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux Pull s390 fixes from Heiko Carstens: - Make KEXEC_SIG available again for CONFIG_MODULES=n - The s390 topology code used to call rebuild_sched_domains() before common code scheduling domains were setup. This was silently ignored by common code, but now results in a warning. Address by avoiding the early call - Convert debug area lock from spinlock to raw spinlock to address lockdep warnings - The recent 3490 tape device driver rework resulted in a different device driver name, which is visible via sysfs for user space. This breaks at least one user space application. Change the device driver name back to its old name to fix this * tag 's390-7.0-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: s390/tape: Fix device driver name s390/debug: Convert debug area lock from a spinlock to a raw spinlock s390/smp: Avoid calling rebuild_sched_domains() early s390/kexec: Make KEXEC_SIG available when CONFIG_MODULES=n |
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Benjamin Block
|
3ce500aac0 |
s390/debug: Convert debug area lock from a spinlock to a raw spinlock
With PREEMPT_RT as potential configuration option, spinlock_t is now considered as a sleeping lock, and thus might cause issues when used in an atomic context. But even with PREEMPT_RT as potential configuration option, raw_spinlock_t remains as a true spinning lock/atomic context. This creates potential issues with the s390 debug/tracing feature. The functions to trace errors are called in various contexts, including under lock of raw_spinlock_t, and thus the used spinlock_t in each debug area is in violation of the locking semantics. Here are two examples involving failing PCI Read accesses that are traced while holding `pci_lock` in `drivers/pci/access.c`: ============================= [ BUG: Invalid wait context ] 6.19.0-devel #18 Not tainted ----------------------------- bash/3833 is trying to lock: 0000027790baee30 (&rc->lock){-.-.}-{3:3}, at: debug_event_common+0xfc/0x300 other info that might help us debug this: context-{5:5} 5 locks held by bash/3833: #0: 0000027efbb29450 (sb_writers#3){.+.+}-{0:0}, at: ksys_write+0x7c/0xf0 #1: 00000277f0504a90 (&of->mutex#2){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x13e/0x260 #2: 00000277beed8c18 (kn->active#339){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x164/0x260 #3: 00000277e9859190 (&dev->mutex){....}-{4:4}, at: pci_dev_lock+0x2e/0x40 #4: 00000383068a7708 (pci_lock){....}-{2:2}, at: pci_bus_read_config_dword+0x4a/0xb0 stack backtrace: CPU: 6 UID: 0 PID: 3833 Comm: bash Kdump: loaded Not tainted 6.19.0-devel #18 PREEMPTLAZY Hardware name: IBM 9175 ME1 701 (LPAR) Call Trace: [<00000383048afec2>] dump_stack_lvl+0xa2/0xe8 [<00000383049ba166>] __lock_acquire+0x816/0x1660 [<00000383049bb1fa>] lock_acquire+0x24a/0x370 [<00000383059e3860>] _raw_spin_lock_irqsave+0x70/0xc0 [<00000383048bbb6c>] debug_event_common+0xfc/0x300 [<0000038304900b0a>] __zpci_load+0x17a/0x1f0 [<00000383048fad88>] pci_read+0x88/0xd0 [<00000383054cbce0>] pci_bus_read_config_dword+0x70/0xb0 [<00000383054d55e4>] pci_dev_wait+0x174/0x290 [<00000383054d5a3e>] __pci_reset_function_locked+0xfe/0x170 [<00000383054d9b30>] pci_reset_function+0xd0/0x100 [<00000383054ee21a>] reset_store+0x5a/0x80 [<0000038304e98758>] kernfs_fop_write_iter+0x1e8/0x260 [<0000038304d995da>] new_sync_write+0x13a/0x180 [<0000038304d9c5d0>] vfs_write+0x200/0x330 [<0000038304d9c88c>] ksys_write+0x7c/0xf0 [<00000383059cfa80>] __do_syscall+0x210/0x500 [<00000383059e4c06>] system_call+0x6e/0x90 INFO: lockdep is turned off. ============================= [ BUG: Invalid wait context ] 6.19.0-devel #3 Not tainted ----------------------------- bash/6861 is trying to lock: 0000009da05c7430 (&rc->lock){-.-.}-{3:3}, at: debug_event_common+0xfc/0x300 other info that might help us debug this: context-{5:5} 5 locks held by bash/6861: #0: 000000acff404450 (sb_writers#3){.+.+}-{0:0}, at: ksys_write+0x7c/0xf0 #1: 000000acff41c490 (&of->mutex#2){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x13e/0x260 #2: 0000009da36937d8 (kn->active#75){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x164/0x260 #3: 0000009dd15250d0 (&zdev->state_lock){+.+.}-{4:4}, at: enable_slot+0x2e/0xc0 #4: 000001a19682f708 (pci_lock){....}-{2:2}, at: pci_bus_read_config_byte+0x42/0xa0 stack backtrace: CPU: 16 UID: 0 PID: 6861 Comm: bash Kdump: loaded Not tainted 6.19.0-devel #3 PREEMPTLAZY Hardware name: IBM 9175 ME1 701 (LPAR) Call Trace: [<000001a194837ec2>] dump_stack_lvl+0xa2/0xe8 [<000001a194942166>] __lock_acquire+0x816/0x1660 [<000001a1949431fa>] lock_acquire+0x24a/0x370 [<000001a19596b810>] _raw_spin_lock_irqsave+0x70/0xc0 [<000001a194843b6c>] debug_event_common+0xfc/0x300 [<000001a194888b0a>] __zpci_load+0x17a/0x1f0 [<000001a194882d88>] pci_read+0x88/0xd0 [<000001a195453b88>] pci_bus_read_config_byte+0x68/0xa0 [<000001a195457bc2>] pci_setup_device+0x62/0xad0 [<000001a195458e70>] pci_scan_single_device+0x90/0xe0 [<000001a19488a0f6>] zpci_bus_scan_device+0x46/0x80 [<000001a19547f958>] enable_slot+0x98/0xc0 [<000001a19547f134>] power_write_file+0xc4/0x110 [<000001a194e20758>] kernfs_fop_write_iter+0x1e8/0x260 [<000001a194d215da>] new_sync_write+0x13a/0x180 [<000001a194d245d0>] vfs_write+0x200/0x330 [<000001a194d2488c>] ksys_write+0x7c/0xf0 [<000001a195957a30>] __do_syscall+0x210/0x500 [<000001a19596cbb6>] system_call+0x6e/0x90 INFO: lockdep is turned off. Since it is desired to keep it possible to create trace records in most situations, including this particular case (failing PCI config space accesses are relevant), convert the used spinlock_t in `struct debug_info` to raw_spinlock_t. The impact is small, as the debug area lock only protects bounded memory access without external dependencies, apart from one function debug_set_size() where kfree() is implicitly called with the lock held. Move debug_info_free() out of this lock, to keep remove this external dependency. Acked-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Benjamin Block <bblock@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> |
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Heiko Carstens
|
3ee5333fee |
s390/smp: Avoid calling rebuild_sched_domains() early
Since a recent cpuset code change [1] the kernel emits warnings like this:
WARNING: kernel/cgroup/cpuset.c:966 at rebuild_sched_domains_locked+0xe0/0x120, CPU#0: kworker/0:0/9
Modules linked in:
CPU: 0 UID: 0 PID: 9 Comm: kworker/0:0 Not tainted 6.20.0-20260215.rc0.git3.bb7a3fc2c976.300.fc43.s390x+git #1 PREEMPTLAZY
Hardware name: IBM 3931 A01 703 (KVM/Linux)
Workqueue: events topology_work_fn
Krnl PSW : 0704c00180000000 000002922e7af5c4 (rebuild_sched_domains_locked+0xe4/0x120)
...
Call Trace:
[<000002922e7af5c4>] rebuild_sched_domains_locked+0xe4/0x120
[<000002922e7af634>] rebuild_sched_domains+0x34/0x50
[<000002922e6ba232>] process_one_work+0x1b2/0x490
[<000002922e6bc4b8>] worker_thread+0x1f8/0x3b0
[<000002922e6c6a98>] kthread+0x148/0x170
[<000002922e645ffc>] __ret_from_fork+0x3c/0x240
[<000002922f51f492>] ret_from_fork+0xa/0x30
Reason for this is that the s390 specific smp initialization code schedules
a work which rebuilds scheduling domains way before the scheduler is smp
aware. With the mentioned commit the (invalid) rebuild request is not
anymore silently discarded but instead leads to warning.
Address this by avoiding the early rebuild request.
Reported-by: Marc Hartmayer <marc@linux.ibm.com>
Tested-by: Marc Hartmayer <marc@linux.ibm.com>
Fixes:
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Linus Torvalds
|
cb5573868e |
Loongarch:
- Add more CPUCFG mask bits. - Improve feature detection. - Add lazy load support for FPU and binary translation (LBT) register state. - Fix return value for memory reads from and writes to in-kernel devices. - Add support for detecting preemption from within a guest. - Add KVM steal time test case to tools/selftests. ARM: - Add support for FEAT_IDST, allowing ID registers that are not implemented to be reported as a normal trap rather than as an UNDEF exception. - Add sanitisation of the VTCR_EL2 register, fixing a number of UXN/PXN/XN bugs in the process. - Full handling of RESx bits, instead of only RES0, and resulting in SCTLR_EL2 being added to the list of sanitised registers. - More pKVM fixes for features that are not supposed to be exposed to guests. - Make sure that MTE being disabled on the pKVM host doesn't give it the ability to attack the hypervisor. - Allow pKVM's host stage-2 mappings to use the Force Write Back version of the memory attributes by using the "pass-through' encoding. - Fix trapping of ICC_DIR_EL1 on GICv5 hosts emulating GICv3 for the guest. - Preliminary work for guest GICv5 support. - A bunch of debugfs fixes, removing pointless custom iterators stored in guest data structures. - A small set of FPSIMD cleanups. - Selftest fixes addressing the incorrect alignment of page allocation. - Other assorted low-impact fixes and spelling fixes. RISC-V: - Fixes for issues discoverd by KVM API fuzzing in kvm_riscv_aia_imsic_has_attr(), kvm_riscv_aia_imsic_rw_attr(), and kvm_riscv_vcpu_aia_imsic_update() - Allow Zalasr, Zilsd and Zclsd extensions for Guest/VM - Transparent huge page support for hypervisor page tables - Adjust the number of available guest irq files based on MMIO register sizes found in the device tree or the ACPI tables - Add RISC-V specific paging modes to KVM selftests - Detect paging mode at runtime for selftests s390: - Performance improvement for vSIE (aka nested virtualization) - Completely new memory management. s390 was a special snowflake that enlisted help from the architecture's page table management to build hypervisor page tables, in particular enabling sharing the last level of page tables. This however was a lot of code (~3K lines) in order to support KVM, and also blocked several features. The biggest advantages is that the page size of userspace is completely independent of the page size used by the guest: userspace can mix normal pages, THPs and hugetlbfs as it sees fit, and in fact transparent hugepages were not possible before. It's also now possible to have nested guests and guests with huge pages running on the same host. - Maintainership change for s390 vfio-pci - Small quality of life improvement for protected guests x86: - Add support for giving the guest full ownership of PMU hardware (contexted switched around the fastpath run loop) and allowing direct access to data MSRs and PMCs (restricted by the vPMU model). KVM still intercepts access to control registers, e.g. to enforce event filtering and to prevent the guest from profiling sensitive host state. This is more accurate, since it has no risk of contention and thus dropped events, and also has significantly less overhead. For more information, see the commit message for merge commit |
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Linus Torvalds
|
136114e0ab |
mm.git review status for linus..mm-nonmm-stable
Total patches: 107 Reviews/patch: 1.07 Reviewed rate: 67% - The 2 patch series "ocfs2: give ocfs2 the ability to reclaim suballocator free bg" from Heming Zhao saves disk space by teaching ocfs2 to reclaim suballocator block group space. - The 4 patch series "Add ARRAY_END(), and use it to fix off-by-one bugs" from Alejandro Colomar adds the ARRAY_END() macro and uses it in various places. - The 2 patch series "vmcoreinfo: support VMCOREINFO_BYTES larger than PAGE_SIZE" from Pnina Feder makes the vmcore code future-safe, if VMCOREINFO_BYTES ever exceeds the page size. - The 7 patch series "kallsyms: Prevent invalid access when showing module buildid" from Petr Mladek cleans up kallsyms code related to module buildid and fixes an invalid access crash when printing backtraces. - The 3 patch series "Address page fault in ima_restore_measurement_list()" from Harshit Mogalapalli fixes a kexec-related crash that can occur when booting the second-stage kernel on x86. - The 6 patch series "kho: ABI headers and Documentation updates" from Mike Rapoport updates the kexec handover ABI documentation. - The 4 patch series "Align atomic storage" from Finn Thain adds the __aligned attribute to atomic_t and atomic64_t definitions to get natural alignment of both types on csky, m68k, microblaze, nios2, openrisc and sh. - The 2 patch series "kho: clean up page initialization logic" from Pratyush Yadav simplifies the page initialization logic in kho_restore_page(). - The 6 patch series "Unload linux/kernel.h" from Yury Norov moves several things out of kernel.h and into more appropriate places. - The 7 patch series "don't abuse task_struct.group_leader" from Oleg Nesterov removes the usage of ->group_leader when it is "obviously unnecessary". - The 5 patch series "list private v2 & luo flb" from Pasha Tatashin adds some infrastructure improvements to the live update orchestrator. -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQTTMBEPP41GrTpTJgfdBJ7gKXxAjgUCaY4giAAKCRDdBJ7gKXxA jgusAQDnKkP8UWTqXPC1jI+OrDJGU5ciAx8lzLeBVqMKzoYk9AD/TlhT2Nlx+Ef6 0HCUHUD0FMvAw/7/Dfc6ZKxwBEIxyww= =mmsH -----END PGP SIGNATURE----- Merge tag 'mm-nonmm-stable-2026-02-12-10-48' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Pull non-MM updates from Andrew Morton: - "ocfs2: give ocfs2 the ability to reclaim suballocator free bg" saves disk space by teaching ocfs2 to reclaim suballocator block group space (Heming Zhao) - "Add ARRAY_END(), and use it to fix off-by-one bugs" adds the ARRAY_END() macro and uses it in various places (Alejandro Colomar) - "vmcoreinfo: support VMCOREINFO_BYTES larger than PAGE_SIZE" makes the vmcore code future-safe, if VMCOREINFO_BYTES ever exceeds the page size (Pnina Feder) - "kallsyms: Prevent invalid access when showing module buildid" cleans up kallsyms code related to module buildid and fixes an invalid access crash when printing backtraces (Petr Mladek) - "Address page fault in ima_restore_measurement_list()" fixes a kexec-related crash that can occur when booting the second-stage kernel on x86 (Harshit Mogalapalli) - "kho: ABI headers and Documentation updates" updates the kexec handover ABI documentation (Mike Rapoport) - "Align atomic storage" adds the __aligned attribute to atomic_t and atomic64_t definitions to get natural alignment of both types on csky, m68k, microblaze, nios2, openrisc and sh (Finn Thain) - "kho: clean up page initialization logic" simplifies the page initialization logic in kho_restore_page() (Pratyush Yadav) - "Unload linux/kernel.h" moves several things out of kernel.h and into more appropriate places (Yury Norov) - "don't abuse task_struct.group_leader" removes the usage of ->group_leader when it is "obviously unnecessary" (Oleg Nesterov) - "list private v2 & luo flb" adds some infrastructure improvements to the live update orchestrator (Pasha Tatashin) * tag 'mm-nonmm-stable-2026-02-12-10-48' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (107 commits) watchdog/hardlockup: simplify perf event probe and remove per-cpu dependency procfs: fix missing RCU protection when reading real_parent in do_task_stat() watchdog/softlockup: fix sample ring index wrap in need_counting_irqs() kcsan, compiler_types: avoid duplicate type issues in BPF Type Format kho: fix doc for kho_restore_pages() tests/liveupdate: add in-kernel liveupdate test liveupdate: luo_flb: introduce File-Lifecycle-Bound global state liveupdate: luo_file: Use private list list: add kunit test for private list primitives list: add primitives for private list manipulations delayacct: fix uapi timespec64 definition panic: add panic_force_cpu= parameter to redirect panic to a specific CPU netclassid: use thread_group_leader(p) in update_classid_task() RDMA/umem: don't abuse current->group_leader drm/pan*: don't abuse current->group_leader drm/amd: kill the outdated "Only the pthreads threading model is supported" checks drm/amdgpu: don't abuse current->group_leader android/binder: use same_thread_group(proc->tsk, current) in binder_mmap() android/binder: don't abuse current->group_leader kho: skip memoryless NUMA nodes when reserving scratch areas ... |
||
|
Linus Torvalds
|
4cff5c05e0 |
mm.git review status for linus..mm-stable
Everything:
Total patches: 325
Reviews/patch: 1.39
Reviewed rate: 72%
Excluding DAMON:
Total patches: 262
Reviews/patch: 1.63
Reviewed rate: 82%
Excluding DAMON and zram:
Total patches: 248
Reviews/patch: 1.72
Reviewed rate: 86%
- The 14 patch series "powerpc/64s: do not re-activate batched TLB
flush" from Alexander Gordeev makes arch_{enter|leave}_lazy_mmu_mode()
nest properly.
It adds a generic enter/leave layer and switches architectures to use
it. Various hacks were removed in the process.
- The 7 patch series "zram: introduce compressed data writeback" from
Richard Chang and Sergey Senozhatsky implements data compression for
zram writeback.
- The 8 patch series "mm: folio_zero_user: clear page ranges" from David
Hildenbrand adds clearing of contiguous page ranges for hugepages.
Large improvements during demand faulting are demonstrated.
- The 2 patch series "memcg cleanups" from Chen Ridong tideis up some
memcg code.
- The 12 patch series "mm/damon: introduce {,max_}nr_snapshots and
tracepoint for damos stats" from SeongJae Park improves DAMOS stat's
provided information, deterministic control, and readability.
- The 3 patch series "selftests/mm: hugetlb cgroup charging: robustness
fixes" from Li Wang fixes a few issues in the hugetlb cgroup charging
selftests.
- The 5 patch series "Fix va_high_addr_switch.sh test failure - again"
from Chunyu Hu addresses several issues in the va_high_addr_switch test.
- The 5 patch series "mm/damon/tests/core-kunit: extend existing test
scenarios" from Shu Anzai improves the KUnit test coverage for DAMON.
- The 2 patch series "mm/khugepaged: fix dirty page handling for
MADV_COLLAPSE" from Shivank Garg fixes a glitch in khugepaged which was
causing madvise(MADV_COLLAPSE) to transiently return -EAGAIN.
- The 29 patch series "arch, mm: consolidate hugetlb early reservation"
from Mike Rapoport reworks and consolidates a pile of straggly code
related to reservation of hugetlb memory from bootmem and creation of
CMA areas for hugetlb.
- The 9 patch series "mm: clean up anon_vma implementation" from Lorenzo
Stoakes cleans up the anon_vma implementation in various ways.
- The 3 patch series "tweaks for __alloc_pages_slowpath()" from
Vlastimil Babka does a little streamlining of the page allocator's
slowpath code.
- The 8 patch series "memcg: separate private and public ID namespaces"
from Shakeel Butt cleans up the memcg ID code and prevents the
internal-only private IDs from being exposed to userspace.
- The 6 patch series "mm: hugetlb: allocate frozen gigantic folio" from
Kefeng Wang cleans up the allocation of frozen folios and avoids some
atomic refcount operations.
- The 11 patch series "mm/damon: advance DAMOS-based LRU sorting" from
SeongJae Park improves DAMOS's movement of memory betewwn the active and
inactive LRUs and adds auto-tuning of the ratio-based quotas and of
monitoring intervals.
- The 18 patch series "Support page table check on PowerPC" from Andrew
Donnellan makes CONFIG_PAGE_TABLE_CHECK_ENFORCED work on powerpc.
- The 3 patch series "nodemask: align nodes_and{,not} with underlying
bitmap ops" from Yury Norov makes nodes_and() and nodes_andnot()
propagate the return values from the underlying bit operations, enabling
some cleanup in calling code.
- The 5 patch series "mm/damon: hide kdamond and kdamond_lock from API
callers" from SeongJae Park cleans up some DAMON internal interfaces.
- The 4 patch series "mm/khugepaged: cleanups and scan limit fix" from
Shivank Garg does some cleanup work in khupaged and fixes a scan limit
accounting issue.
- The 24 patch series "mm: balloon infrastructure cleanups" from David
Hildenbrand goes to town on the balloon infrastructure and its page
migration function. Mainly cleanups, also some locking simplification.
- The 2 patch series "mm/vmscan: add tracepoint and reason for
kswapd_failures reset" from Jiayuan Chen adds additional tracepoints to
the page reclaim code.
- The 3 patch series "Replace wq users and add WQ_PERCPU to
alloc_workqueue() users" from Marco Crivellari is part of Marco's
kernel-wide migration from the legacy workqueue APIs over to the
preferred unbound workqueues.
- The 9 patch series "Various mm kselftests improvements/fixes" from
Kevin Brodsky provides various unrelated improvements/fixes for the mm
kselftests.
- The 5 patch series "mm: accelerate gigantic folio allocation" from
Kefeng Wang greatly speeds up gigantic folio allocation, mainly by
avoiding unnecessary work in pfn_range_valid_contig().
- The 5 patch series "selftests/damon: improve leak detection and wss
estimation reliability" from SeongJae Park improves the reliability of
two of the DAMON selftests.
- The 8 patch series "mm/damon: cleanup kdamond, damon_call(), damos
filter and DAMON_MIN_REGION" from SeongJae Park does some cleanup work
in the core DAMON code.
- The 8 patch series "Docs/mm/damon: update intro, modules, maintainer
profile, and misc" from SeongJae Park performs maintenance work on the
DAMON documentation.
- The 10 patch series "mm: add and use vma_assert_stabilised() helper"
from Lorenzo Stoakes refactors and cleans up the core VMA code. The
main aim here is to be able to use the mmap write lock's lockdep state
to perform various assertions regarding the locking which the VMA code
requires.
- The 19 patch series "mm, swap: swap table phase II: unify swapin use"
from Kairui Song removes some old swap code (swap cache bypassing and
swap synchronization) which wasn't working very well. Various other
cleanups and simplifications were made. The end result is a 20% speedup
in one benchmark.
- The 8 patch series "enable PT_RECLAIM on more 64-bit architectures"
from Qi Zheng makes PT_RECLAIM available on 64-bit alpha, loongarch,
mips, parisc, um, Various cleanups were performed along the way.
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Merge tag 'mm-stable-2026-02-11-19-22' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull MM updates from Andrew Morton:
- "powerpc/64s: do not re-activate batched TLB flush" makes
arch_{enter|leave}_lazy_mmu_mode() nest properly (Alexander Gordeev)
It adds a generic enter/leave layer and switches architectures to use
it. Various hacks were removed in the process.
- "zram: introduce compressed data writeback" implements data
compression for zram writeback (Richard Chang and Sergey Senozhatsky)
- "mm: folio_zero_user: clear page ranges" adds clearing of contiguous
page ranges for hugepages. Large improvements during demand faulting
are demonstrated (David Hildenbrand)
- "memcg cleanups" tidies up some memcg code (Chen Ridong)
- "mm/damon: introduce {,max_}nr_snapshots and tracepoint for damos
stats" improves DAMOS stat's provided information, deterministic
control, and readability (SeongJae Park)
- "selftests/mm: hugetlb cgroup charging: robustness fixes" fixes a few
issues in the hugetlb cgroup charging selftests (Li Wang)
- "Fix va_high_addr_switch.sh test failure - again" addresses several
issues in the va_high_addr_switch test (Chunyu Hu)
- "mm/damon/tests/core-kunit: extend existing test scenarios" improves
the KUnit test coverage for DAMON (Shu Anzai)
- "mm/khugepaged: fix dirty page handling for MADV_COLLAPSE" fixes a
glitch in khugepaged which was causing madvise(MADV_COLLAPSE) to
transiently return -EAGAIN (Shivank Garg)
- "arch, mm: consolidate hugetlb early reservation" reworks and
consolidates a pile of straggly code related to reservation of
hugetlb memory from bootmem and creation of CMA areas for hugetlb
(Mike Rapoport)
- "mm: clean up anon_vma implementation" cleans up the anon_vma
implementation in various ways (Lorenzo Stoakes)
- "tweaks for __alloc_pages_slowpath()" does a little streamlining of
the page allocator's slowpath code (Vlastimil Babka)
- "memcg: separate private and public ID namespaces" cleans up the
memcg ID code and prevents the internal-only private IDs from being
exposed to userspace (Shakeel Butt)
- "mm: hugetlb: allocate frozen gigantic folio" cleans up the
allocation of frozen folios and avoids some atomic refcount
operations (Kefeng Wang)
- "mm/damon: advance DAMOS-based LRU sorting" improves DAMOS's movement
of memory betewwn the active and inactive LRUs and adds auto-tuning
of the ratio-based quotas and of monitoring intervals (SeongJae Park)
- "Support page table check on PowerPC" makes
CONFIG_PAGE_TABLE_CHECK_ENFORCED work on powerpc (Andrew Donnellan)
- "nodemask: align nodes_and{,not} with underlying bitmap ops" makes
nodes_and() and nodes_andnot() propagate the return values from the
underlying bit operations, enabling some cleanup in calling code
(Yury Norov)
- "mm/damon: hide kdamond and kdamond_lock from API callers" cleans up
some DAMON internal interfaces (SeongJae Park)
- "mm/khugepaged: cleanups and scan limit fix" does some cleanup work
in khupaged and fixes a scan limit accounting issue (Shivank Garg)
- "mm: balloon infrastructure cleanups" goes to town on the balloon
infrastructure and its page migration function. Mainly cleanups, also
some locking simplification (David Hildenbrand)
- "mm/vmscan: add tracepoint and reason for kswapd_failures reset" adds
additional tracepoints to the page reclaim code (Jiayuan Chen)
- "Replace wq users and add WQ_PERCPU to alloc_workqueue() users" is
part of Marco's kernel-wide migration from the legacy workqueue APIs
over to the preferred unbound workqueues (Marco Crivellari)
- "Various mm kselftests improvements/fixes" provides various unrelated
improvements/fixes for the mm kselftests (Kevin Brodsky)
- "mm: accelerate gigantic folio allocation" greatly speeds up gigantic
folio allocation, mainly by avoiding unnecessary work in
pfn_range_valid_contig() (Kefeng Wang)
- "selftests/damon: improve leak detection and wss estimation
reliability" improves the reliability of two of the DAMON selftests
(SeongJae Park)
- "mm/damon: cleanup kdamond, damon_call(), damos filter and
DAMON_MIN_REGION" does some cleanup work in the core DAMON code
(SeongJae Park)
- "Docs/mm/damon: update intro, modules, maintainer profile, and misc"
performs maintenance work on the DAMON documentation (SeongJae Park)
- "mm: add and use vma_assert_stabilised() helper" refactors and cleans
up the core VMA code. The main aim here is to be able to use the mmap
write lock's lockdep state to perform various assertions regarding
the locking which the VMA code requires (Lorenzo Stoakes)
- "mm, swap: swap table phase II: unify swapin use" removes some old
swap code (swap cache bypassing and swap synchronization) which
wasn't working very well. Various other cleanups and simplifications
were made. The end result is a 20% speedup in one benchmark (Kairui
Song)
- "enable PT_RECLAIM on more 64-bit architectures" makes PT_RECLAIM
available on 64-bit alpha, loongarch, mips, parisc, and um. Various
cleanups were performed along the way (Qi Zheng)
* tag 'mm-stable-2026-02-11-19-22' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (325 commits)
mm/memory: handle non-split locks correctly in zap_empty_pte_table()
mm: move pte table reclaim code to memory.c
mm: make PT_RECLAIM depends on MMU_GATHER_RCU_TABLE_FREE
mm: convert __HAVE_ARCH_TLB_REMOVE_TABLE to CONFIG_HAVE_ARCH_TLB_REMOVE_TABLE config
um: mm: enable MMU_GATHER_RCU_TABLE_FREE
parisc: mm: enable MMU_GATHER_RCU_TABLE_FREE
mips: mm: enable MMU_GATHER_RCU_TABLE_FREE
LoongArch: mm: enable MMU_GATHER_RCU_TABLE_FREE
alpha: mm: enable MMU_GATHER_RCU_TABLE_FREE
mm: change mm/pt_reclaim.c to use asm/tlb.h instead of asm-generic/tlb.h
mm/damon/stat: remove __read_mostly from memory_idle_ms_percentiles
zsmalloc: make common caches global
mm: add SPDX id lines to some mm source files
mm/zswap: use %pe to print error pointers
mm/vmscan: use %pe to print error pointers
mm/readahead: fix typo in comment
mm: khugepaged: fix NR_FILE_PAGES and NR_SHMEM in collapse_file()
mm: refactor vma_map_pages to use vm_insert_pages
mm/damon: unify address range representation with damon_addr_range
mm/cma: replace snprintf with strscpy in cma_new_area
...
|
||
Paolo Bonzini
|
b1195183ed |
- gmap rewrite: completely new memory management for kvm/s390
- vSIE improvement - maintainership change for s390 vfio-pci - small quality of life improvement for protected guests -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEoWuZBM6M3lCBSfTnuARItAMU6BMFAmmLOKAACgkQuARItAMU 6BOkhQ/9G0Sr1bfkcSQvbszvjSoDsOCSm+oAm39679Dr4v+7SsItknTutYK0M7dM n6oY2kU1dveFsF0FwBAALh4LC0lYNEmz34eHxaFPFfgqQ9lX2fBAQuBSPq8uOz1L Pk6IIlqTls8TAvKF/KqTXCEULnPGVXD2KP4WaSir+T2vZr6N/mqB7cZPR23/rMAi +PF/UtmgbfG+eRjqA8QRdm8nnzTrM5cWe9roZXYsAXDLZh+EYYeG4d96GFTV8udY /6mV1YKP0Aa+youC5p4oIh1Iv7p/Yjv6RxPoEbW1O31M9yBDJmFpz4W5C/rdkzwI nOjQj9i7ZINXf83kAZMvFb8MdXlJzaw8rBUlWzxNfrsL4ga8Rp3xMNEdufWd3T5x zNFXr0ANuBifi0B0EasBWlYDRbK4WGAC4vnkgmxqP5t2JiAN+d0FXB8LaRyZvgs/ tiwEDenCk1eDWEBcWbLnX7fGGDKDUNXVMAFTrGM1BMNZe6/IL/h/sypLuYSJ/d3Y VXDgZZyAWUVqjidDxrwurdjyzvbPd69GDbKjhTuUu4OdqUMucjjQf74w6m857Wn/ 9oLoR0p+8deb1SQ2RuB8sujcJiO9YHczwL8PLDa+bGw3jH6TRiMVVrt1HOw5QmfG QpwhKvrF2yPTgv5VZbFvYEvtITnBBfaepQe97pDDEfsHqPeStmI= =2eiy -----END PGP SIGNATURE----- Merge tag 'kvm-s390-next-7.0-1' of https://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD - gmap rewrite: completely new memory management for kvm/s390 - vSIE improvement - maintainership change for s390 vfio-pci - small quality of life improvement for protected guests |
||
|
Linus Torvalds
|
f1c538ca81 |
Updates for the VDSO subsystem:
- Provide the missing 64-bit variant of clock_getres()
This allows the extension of CONFIG_COMPAT_32BIT_TIME to the vDSO and
finally the removal of 32-bit time types from the kernel and UAPI.
- Remove the useless and broken getcpu_cache from the VDSO
The intention was to provide a trivial way to retrieve the CPU number from
the VDSO, but as the VDSO data is per process there is no way to make it
work.
- Switch get/put_unaligned() from packed struct to memcpy()
The packed struct violates strict aliasing rules which requires to pass
-fno-strict-aliasing to the compiler. As this are scalar values
__builtin_memcpy() turns them into simple loads and stores
- Use __typeof_unqual__() for __unqual_scalar_typeof()
The get/put_unaligned() changes triggered a new sparse warning when __beNN
types are used with get/put_unaligned() as sparse builds add a special
'bitwise' attribute to them which prevents sparse to evaluate the Generic
in __unqual_scalar_typeof().
Newer sparse versions support __typeof_unqual__() which avoids the problem,
but requires a recent sparse install. So this adds a sanity check to sparse
builds, which validates that sparse is available and capable of handling it.
- Force inline __cvdso_clock_getres_common()
Compilers sometimes un-inline agressively, which results in function call
overhead and problems with automatic stack variable initialization.
Interestingly enough the force inlining results in smaller code than the
un-inlined variant produced by GCC when optimizing for size.
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Merge tag 'timers-vdso-2026-02-09' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull VDSO updates from Thomas Gleixner:
- Provide the missing 64-bit variant of clock_getres()
This allows the extension of CONFIG_COMPAT_32BIT_TIME to the vDSO and
finally the removal of 32-bit time types from the kernel and UAPI.
- Remove the useless and broken getcpu_cache from the VDSO
The intention was to provide a trivial way to retrieve the CPU number
from the VDSO, but as the VDSO data is per process there is no way to
make it work.
- Switch get/put_unaligned() from packed struct to memcpy()
The packed struct violates strict aliasing rules which requires to
pass -fno-strict-aliasing to the compiler. As this are scalar values
__builtin_memcpy() turns them into simple loads and stores
- Use __typeof_unqual__() for __unqual_scalar_typeof()
The get/put_unaligned() changes triggered a new sparse warning when
__beNN types are used with get/put_unaligned() as sparse builds add a
special 'bitwise' attribute to them which prevents sparse to evaluate
the Generic in __unqual_scalar_typeof().
Newer sparse versions support __typeof_unqual__() which avoids the
problem, but requires a recent sparse install. So this adds a sanity
check to sparse builds, which validates that sparse is available and
capable of handling it.
- Force inline __cvdso_clock_getres_common()
Compilers sometimes un-inline agressively, which results in function
call overhead and problems with automatic stack variable
initialization.
Interestingly enough the force inlining results in smaller code than
the un-inlined variant produced by GCC when optimizing for size.
* tag 'timers-vdso-2026-02-09' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
vdso/gettimeofday: Force inlining of __cvdso_clock_getres_common()
x86/percpu: Make CONFIG_USE_X86_SEG_SUPPORT work with sparse
compiler: Use __typeof_unqual__() for __unqual_scalar_typeof()
powerpc/vdso: Provide clock_getres_time64()
tools headers: Remove unneeded ignoring of warnings in unaligned.h
tools headers: Update the linux/unaligned.h copy with the kernel sources
vdso: Switch get/put_unaligned() from packed struct to memcpy()
parisc: Inline a type punning version of get_unaligned_le32()
vdso: Remove struct getcpu_cache
MIPS: vdso: Provide getres_time64() for 32-bit ABIs
arm64: vdso32: Provide clock_getres_time64()
ARM: VDSO: Provide clock_getres_time64()
ARM: VDSO: Patch out __vdso_clock_getres() if unavailable
x86/vdso: Provide clock_getres_time64() for x86-32
selftests: vDSO: vdso_test_abi: Add test for clock_getres_time64()
selftests: vDSO: vdso_test_abi: Use UAPI system call numbers
selftests: vDSO: vdso_config: Add configurations for clock_getres_time64()
vdso: Add prototype for __vdso_clock_getres_time64()
|
||
|
Linus Torvalds
|
36ae1c45b2 |
Scheduler changes for v7.0:
Scheduler Kconfig space updates:
- Further consolidate configurable preemption modes: reduce
the number of architectures that are allowed to offer
PREEMPT_NONE and PREEMPT_VOLUNTARY, reducing the number
of preemption models from four to just two: 'full' and 'lazy'
on up-to-date architectures (arm64, loongarch, powerpc,
riscv, s390, x86).
None and voluntary are only available as legacy features
on platforms that don't implement lazy preemption yet,
or which don't even support preemption.
The goal is to eventually remove cond_resched() and
voluntary preemption altogether.
(Peter Zijlstra)
RSEQ based 'scheduler time slice extension' support:
This allows a thread to request a time slice extension when it
enters a critical section to avoid contention on a resource when
the thread is scheduled out inside of the critical section.
- Add fields and constants for time slice extension
- Provide static branch for time slice extensions
- Add statistics for time slice extensions
- Add prctl() to enable time slice extensions
- Implement sys_rseq_slice_yield()
- Implement syscall entry work for time slice extensions
- Implement time slice extension enforcement timer
- Reset slice extension when scheduled
- Implement rseq_grant_slice_extension()
- entry: Hook up rseq time slice extension
- selftests: Implement time slice extension test
(Thomas Gleixner)
- Allow registering RSEQ with slice extension
- Move slice_ext_nsec to debugfs
- Lower default slice extension
- selftests/rseq: Add rseq slice histogram script
(Peter Zijlstra)
Scheduler performance/scalability improvements:
- Update rq->avg_idle when a task is moved to an idle CPU,
which improves the scalability of various workloads.
(Shubhang Kaushik)
- Reorder fields in 'struct rq' for better caching
(Blake Jones)
- Fair scheduler SMP NOHZ balancing code speedups:
- Move checking for nohz cpus after time check
- Change likelyhood of nohz.nr_cpus
- Remove nohz.nr_cpus and use weight of cpumask instead
(Shrikanth Hegde)
- Avoid false sharing for sched_clock_irqtime (Wangyang Guo)
- Drop useless cpumask_empty() in find_energy_efficient_cpu()
- Simplify task_numa_find_cpu()
- Use cpumask_weight_and() in sched_balance_find_dst_group()
(Yury Norov)
DL scheduler updates:
- Add a deadline server for sched_ext tasks (by Andrea Righi and
Joel Fernandes, with fixes by Peter Zijlstra)
RT scheduler updates:
- Skip currently executing CPU in rto_next_cpu() (Chen Jinghuang)
Entry code updates and performance improvements, which is part of the
scheduler tree in this cycle due to interdependencies with the RSEQ
based time slice extension work:
- Remove unused syscall argument from syscall_trace_enter()
- Rework syscall_exit_to_user_mode_work() for architecture reuse
- Add arch_ptrace_report_syscall_entry/exit()
- Inline syscall_exit_work() and syscall_trace_enter()
(Jinjie Ruan)
Scheduler core updates:
- Rework sched_class::wakeup_preempt() and rq_modified_*()
- Avoid rq->lock bouncing in sched_balance_newidle()
- Rename rcu_dereference_check_sched_domain() =>
rcu_dereference_sched_domain()
- <linux/compiler_types.h>: Add the __signed_scalar_typeof() helper
(Peter Zijlstra)
Fair scheduler updates/refactoring:
- Fold the sched_avg update
- Change rcu_dereference_check_sched_domain() to rcu-sched
- Switch to rcu_dereference_all()
- Remove superfluous rcu_read_lock()
- Limit hrtick work
(Peter Zijlstra)
- Join two #ifdef CONFIG_FAIR_GROUP_SCHED blocks
- Clean up comments in 'struct cfs_rq'
- Separate se->vlag from se->vprot
- Rename cfs_rq::avg_load to cfs_rq::sum_weight
- Rename cfs_rq::avg_vruntime to ::sum_w_vruntime & helper functions
- Introduce and use the vruntime_cmp() and vruntime_op() wrappers
for wrapped-signed aritmetics
- Sort out 'blocked_load*' namespace noise
(Ingo Molnar)
Scheduler debugging code updates:
- Export hidden tracepoints to modules (Gabriele Monaco)
- Convert copy_from_user() + kstrtouint() to kstrtouint_from_user()
(Fushuai Wang)
- Add assertions to QUEUE_CLASS (Peter Zijlstra)
- hrtimer: Fix tracing oddity (Thomas Gleixner)
Misc fixes and cleanups:
- Re-evaluate scheduling when migrating queued tasks out of
throttled cgroups (Zicheng Qu)
- Remove task_struct->faults_disabled_mapping (Christoph Hellwig)
- Fix math notation errors in avg_vruntime comment (Zhan Xusheng)
- sched/cpufreq: Use %pe format for PTR_ERR() printing (zenghongling)
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'sched-core-2026-02-09' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull scheduler updates from Ingo Molnar:
"Scheduler Kconfig space updates:
- Further consolidate configurable preemption modes (Peter Zijlstra)
Reduce the number of architectures that are allowed to offer
PREEMPT_NONE and PREEMPT_VOLUNTARY, reducing the number of
preemption models from four to just two: 'full' and 'lazy' on
up-to-date architectures (arm64, loongarch, powerpc, riscv, s390,
x86).
None and voluntary are only available as legacy features on
platforms that don't implement lazy preemption yet, or which don't
even support preemption.
The goal is to eventually remove cond_resched() and voluntary
preemption altogether.
RSEQ based 'scheduler time slice extension' support (Thomas Gleixner
and Peter Zijlstra):
This allows a thread to request a time slice extension when it enters
a critical section to avoid contention on a resource when the thread
is scheduled out inside of the critical section.
- Add fields and constants for time slice extension
- Provide static branch for time slice extensions
- Add statistics for time slice extensions
- Add prctl() to enable time slice extensions
- Implement sys_rseq_slice_yield()
- Implement syscall entry work for time slice extensions
- Implement time slice extension enforcement timer
- Reset slice extension when scheduled
- Implement rseq_grant_slice_extension()
- entry: Hook up rseq time slice extension
- selftests: Implement time slice extension test
- Allow registering RSEQ with slice extension
- Move slice_ext_nsec to debugfs
- Lower default slice extension
- selftests/rseq: Add rseq slice histogram script
Scheduler performance/scalability improvements:
- Update rq->avg_idle when a task is moved to an idle CPU, which
improves the scalability of various workloads (Shubhang Kaushik)
- Reorder fields in 'struct rq' for better caching (Blake Jones)
- Fair scheduler SMP NOHZ balancing code speedups (Shrikanth Hegde):
- Move checking for nohz cpus after time check
- Change likelyhood of nohz.nr_cpus
- Remove nohz.nr_cpus and use weight of cpumask instead
- Avoid false sharing for sched_clock_irqtime (Wangyang Guo)
- Cleanups (Yury Norov):
- Drop useless cpumask_empty() in find_energy_efficient_cpu()
- Simplify task_numa_find_cpu()
- Use cpumask_weight_and() in sched_balance_find_dst_group()
DL scheduler updates:
- Add a deadline server for sched_ext tasks (by Andrea Righi and Joel
Fernandes, with fixes by Peter Zijlstra)
RT scheduler updates:
- Skip currently executing CPU in rto_next_cpu() (Chen Jinghuang)
Entry code updates and performance improvements (Jinjie Ruan)
This is part of the scheduler tree in this cycle due to inter-
dependencies with the RSEQ based time slice extension work:
- Remove unused syscall argument from syscall_trace_enter()
- Rework syscall_exit_to_user_mode_work() for architecture reuse
- Add arch_ptrace_report_syscall_entry/exit()
- Inline syscall_exit_work() and syscall_trace_enter()
Scheduler core updates (Peter Zijlstra):
- Rework sched_class::wakeup_preempt() and rq_modified_*()
- Avoid rq->lock bouncing in sched_balance_newidle()
- Rename rcu_dereference_check_sched_domain() =>
rcu_dereference_sched_domain()
- <linux/compiler_types.h>: Add the __signed_scalar_typeof() helper
Fair scheduler updates/refactoring (Peter Zijlstra and Ingo Molnar):
- Fold the sched_avg update
- Change rcu_dereference_check_sched_domain() to rcu-sched
- Switch to rcu_dereference_all()
- Remove superfluous rcu_read_lock()
- Limit hrtick work
- Join two #ifdef CONFIG_FAIR_GROUP_SCHED blocks
- Clean up comments in 'struct cfs_rq'
- Separate se->vlag from se->vprot
- Rename cfs_rq::avg_load to cfs_rq::sum_weight
- Rename cfs_rq::avg_vruntime to ::sum_w_vruntime & helper functions
- Introduce and use the vruntime_cmp() and vruntime_op() wrappers for
wrapped-signed aritmetics
- Sort out 'blocked_load*' namespace noise
Scheduler debugging code updates:
- Export hidden tracepoints to modules (Gabriele Monaco)
- Convert copy_from_user() + kstrtouint() to kstrtouint_from_user()
(Fushuai Wang)
- Add assertions to QUEUE_CLASS (Peter Zijlstra)
- hrtimer: Fix tracing oddity (Thomas Gleixner)
Misc fixes and cleanups:
- Re-evaluate scheduling when migrating queued tasks out of throttled
cgroups (Zicheng Qu)
- Remove task_struct->faults_disabled_mapping (Christoph Hellwig)
- Fix math notation errors in avg_vruntime comment (Zhan Xusheng)
- sched/cpufreq: Use %pe format for PTR_ERR() printing
(zenghongling)"
* tag 'sched-core-2026-02-09' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (64 commits)
sched: Re-evaluate scheduling when migrating queued tasks out of throttled cgroups
sched/cpufreq: Use %pe format for PTR_ERR() printing
sched/rt: Skip currently executing CPU in rto_next_cpu()
sched/clock: Avoid false sharing for sched_clock_irqtime
selftests/sched_ext: Add test for DL server total_bw consistency
selftests/sched_ext: Add test for sched_ext dl_server
sched/debug: Fix dl_server (re)start conditions
sched/debug: Add support to change sched_ext server params
sched_ext: Add a DL server for sched_ext tasks
sched/debug: Stop and start server based on if it was active
sched/debug: Fix updating of ppos on server write ops
sched/deadline: Clear the defer params
entry: Inline syscall_exit_work() and syscall_trace_enter()
entry: Add arch_ptrace_report_syscall_entry/exit()
entry: Rework syscall_exit_to_user_mode_work() for architecture reuse
entry: Remove unused syscall argument from syscall_trace_enter()
sched: remove task_struct->faults_disabled_mapping
sched: Update rq->avg_idle when a task is moved to an idle CPU
selftests/rseq: Add rseq slice histogram script
hrtimer: Fix trace oddity
...
|
||
|
Linus Torvalds
|
c48953d819 |
s390 updates for 7.0 merge window
- Drop support for outdated 3590/3592 and 3480 tape devices, and limit support to virtualized 3490E types devices - Implement exception based WARN() and WARN_ONCE() similar to x86 - Slightly optimize preempt primitives like __preempt_count_add() and __preempt_count_dec_and_test() - A couple of small fixes and improvements -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEECMNfWEw3SLnmiLkZIg7DeRspbsIFAmmHePIACgkQIg7DeRsp bsIQeA//ZBOWwSlIkGhdH/qn7F2RMxq/FkvYN28YvCo1VFdAiqRXjDBH8yXE9Px4 MghsDY1GzmW3M56Qq/rYZ2UhK0dIgpu9l8SJa5uxRaIzhIUxjmNJa+f3LhtCTZZH 9timoL5zL+n8QwwLPo9DgKy+m/BOodKBeI9cHFYoia64eJqo1xDVg8tYzW+vlVZT LZt0kT6Nz/Hrkg/uOhsz40IGzR/fcsNeDGTF+JIjqcfpdMSAeDMeleWVRacw/0BZ q1gifRXxe04N8bjS7c98RiKX7CD3xQzzibH2ert2Mupu+yir6pvAlgYHOif3Z8gi 6trcSWaxZCCslS2U7O1g/hyz1WXEFC+iDwajGiqT0XRSjuQ2FeVmfqcmaE0CekyY 5mpdtwfLrNSZJL422a3lckqz73gkge5hC46wgvhpvx7lb4IF6paYsk6FPDZlxw+/ THxbrYufs71VACvcfRs5MXSS94qkzkdgo5jhnS/m5zhblIrdkBUz29c5g24qUWo1 ihyzkqtwMFHpKXE9rHK/Z80uZXr4/cLPpMq8XYXRQHZ6vFyZFfu4QpLHWTQ0VMyp ZBijhRqzlN/nAItAfBsgJ5QipHk2WL7V8zoi5xu7QeH+lrZ+7+koSVxGJAZbG4OO 3fv6Nucjr/zCbyRKrjEaWaXzdMCVSdfrtfTQgftgFHTO8IxVLjc= =xeBU -----END PGP SIGNATURE----- Merge tag 's390-7.0-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux Pull s390 updates from Heiko Carstens: - Drop support for outdated 3590/3592 and 3480 tape devices, and limit support to virtualized 3490E types devices - Implement exception based WARN() and WARN_ONCE() similar to x86 - Slightly optimize preempt primitives like __preempt_count_add() and __preempt_count_dec_and_test() - A couple of small fixes and improvements * tag 's390-7.0-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (35 commits) s390/tape: Consolidate tape config options and modules s390/cio: Fix device lifecycle handling in css_alloc_subchannel() s390/tape: Rename tape_34xx.c to tape_3490.c s390/tape: Cleanup sense data analysis and error handling s390/tape: Remove 3480 tape device type s390/tape: Remove unused command definitions s390/tape: Remove special block id handling s390/tape: Remove tape load display support s390/tape: Remove support for 3590/3592 models s390/kexec: Emit an error message when cmdline is too long s390/configs: Enable BLK_DEV_NULL_BLK as module s390: Document s390 stackprotector support s390/perf: Disable register readout on sampling events s390/Kconfig: Define non-zero ILLEGAL_POINTER_VALUE s390/bug: Prevent tail-call optimization s390/bug: Skip __WARN_trap() in call traces s390/bug: Implement WARN_ONCE() s390/bug: Implement __WARN_printf() s390/traps: Copy monitor code to pt_regs s390/bug: Introduce and use monitor code macro ... |
||
Claudio Imbrenda
|
e38c884df9 |
KVM: s390: Switch to new gmap
Switch KVM/s390 to use the new gmap code. Remove includes to <gmap.h> and include "gmap.h" instead; fix all the existing users of the old gmap functions to use the new ones instead. Fix guest storage key access functions to work with the new gmap. Acked-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com> |
||
|
Claudio Imbrenda
|
3ddee7e651 |
KVM: s390: Export two functions
Export __make_folio_secure() and s390_wiggle_split_folio(), as they will be needed to be used by KVM. Acked-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com> |
||
|
Claudio Imbrenda
|
21401ce497 |
s390: Make UV folio operations work on whole folio
uv_destroy_folio() and uv_convert_from_secure_folio() should work on all pages in the folio, not just the first one. This was fine until now, but it will become a problem with upcoming patches. Acked-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com> |
||
|
Vasily Gorbik
|
f8a9c11000 |
s390/kexec: Emit an error message when cmdline is too long
Currently, if the command line passed to kexec_file_load() exceeds the supported limit of the kernel being kexec'd, -EINVAL is returned to userspace, which is consistent across architectures. Since -EINVAL is not specific to this case, the kexec tool cannot provide a specific reason for the failure. Many architectures emit an error message in this case. Add a similar error message, including the effective limit, since the command line length is configurable. Acked-by: Alexander Gordeev <agordeev@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> |
||
Peter Zijlstra
|
3e4067169c |
Linux 6.19-rc8
-----BEGIN PGP SIGNATURE----- iQFSBAABCgA8FiEEq68RxlopcLEwq+PEeb4+QwBBGIYFAml/zSkeHHRvcnZhbGRz QGxpbnV4LWZvdW5kYXRpb24ub3JnAAoJEHm+PkMAQRiG+bwIAJ0jbbeKDyeJJxPo 8PgScnPJx9vBL3hGpphZrhbV3GOe9bDhKM/0Xk9qMDbpAm9C6qiBMTiDWyvWv5Qi qzDlZfoymMaDLPMxw9WHjJ++i1Z2StNdrz57Vze98C3/iG6gBcKnUEUzvF9nigri HIoxoOKlbSXLPUIzt49xE7YX+CRJhLF/kXmfoauZn5ghpv+uqSpWvRbUQJa3dmc0 S4Ie/nbPtdVHmy1Fz9LJFDOzsdhGyjzHF4kc4shDkjAs8RAr8fJh74mQHO5a3MWA 3WZ7GAAAc4XXNqj76X2dnVlMWpQNJ4p2e+OalsuXGA6VQ7OgbrJGMX8P6dMFn5AF 8hFsXn4= =IdZ1 -----END PGP SIGNATURE----- Merge branch 'v6.19-rc8' Update to avoid conflicts with /urgent patches. Signed-off-by: Peter Zijlstra <peterz@infradead.org> |
||
Thomas Richter
|
b2c04fc123 |
s390/perf: Disable register readout on sampling events
Running commands # ./perf record -IR0,R1 -a sleep 1 extracts and displays register value of general purpose register r1 and r0. However the value displayed of any register is random and does not reflect the register value recorded at the time of the sample interrupt. The sampling device driver on s390 creates a very large buffer for the hardware to store the samples. Only when that large buffer gets full an interrupt is generated and many hundreds of sample entries are processed and copied to the kernel ring buffer and eventually get copied to the perf tool. It is during the copy to the kernel ring buffer that each sample is processed (on s390) and at that time the register values are extracted. This is not the original goal, the register values should be read when the samples are created not when the samples are copied to the kernel ring buffer. Prevent this event from being installed in the first place and return -EOPNOTSUPP. This is already the case for PERF_SAMPLE_REGS_USER. Signed-off-by: Thomas Richter <tmricht@linux.ibm.com> Reviewed-by: Jan Polensky <japo@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> |
||
|
Heiko Carstens
|
79996065cf |
s390/bug: Skip __WARN_trap() in call traces
In order to avoid rather pointless warning disassemblies of __WARN_trap()
set the PSW address to the return address of the function which called
__WARN_trap(). This is the address to which __WARN_trap() would return
in any case.
The result is a disassembly of the function which called __WARN_trap(),
which is much more helpful.
Before:
WARNING: arch/s390/kernel/setup.c:1017 at foobar+0x2c/0x20, CPU#0: swapper/0/0
...
Krnl PSW : 0704c00180000000 000003ffe0f675f4 (__WARN_trap+0x4/0x10)
...
Krnl Code: 000003ffe0f675ec: 0707 bcr 0,%r7
000003ffe0f675ee: 0707 bcr 0,%r7
*000003ffe0f675f0: af000001 mc 1,0
>000003ffe0f675f4: 07fe bcr 15,%r14
000003ffe0f675f6: 47000700 bc 0,1792
000003ffe0f675fa: 0707 bcr 0,%r7
000003ffe0f675fc: 0707 bcr 0,%r7
000003ffe0f675fe: 0707 bcr 0,%r7
Call Trace:
[<000003ffe0f675f4>] __WARN_trap+0x4/0x10
[<000003ffe185bc2e>] arch_cpu_finalize_init+0x26/0x60
[<000003ffe185654c>] start_kernel+0x53c/0x5d8
[<000003ffe010002e>] startup_continue+0x2e/0x40
Afterwards:
WARNING: arch/s390/kernel/setup.c:1017 at foobar+0x12/0x30, CPU#0: swapper/0/0
...
Krnl PSW : 0704c00180000000 000003ffe185bc2e (arch_cpu_finalize_init+0x26/0x60)
...
Krnl Code: 000003ffe185bc1c: e3f0ff98ff71 lay %r15,-104(%r15)
000003ffe185bc22: e3e0f0980024 stg %r14,152(%r15)
*000003ffe185bc28: c0e5ff45ed94 brasl %r14,000003ffe0119750
>000003ffe185bc2e: c0e5ffa052b9 brasl %r14,000003ffe0c661a0
000003ffe185bc34: c020fffe86d6 larl %r2,000003ffe182c9e0
000003ffe185bc3a: e548f0a80006 mvghi 168(%r15),6
000003ffe185bc40: e548f0a00005 mvghi 160(%r15),5
000003ffe185bc46: a7690004 lghi %r6,4
Call Trace:
[<000003ffe185bc2e>] arch_cpu_finalize_init+0x26/0x60
[<000003ffe185654c>] start_kernel+0x53c/0x5d8
[<000003ffe010002e>] startup_continue+0x2e/0x40
Reviewed-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
|
||
|
Heiko Carstens
|
04dabb4261 |
s390/bug: Implement __WARN_printf()
This is the s390 variant of commit
|
||
|
Heiko Carstens
|
ee44f4e7eb |
s390/traps: Copy monitor code to pt_regs
In case of a monitor call program check the CPU stores the monitor code to lowcore. Let the program check handler copy it to the pt_regs structure so it can be used by the monitor call exception handler. Instead of increasing the pt_regs size add a union which contains both orig_gpr2 and monitor_code, since orig_gpr2 is not used in case of a program check. Reviewed-by: Sven Schnelle <svens@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> |
||
|
Heiko Carstens
|
8cbfd13601 |
s390/bug: Introduce and use monitor code macro
The first operand address of the monitor call (mc) instruction is the monitor code. Currently the monitor code is ignored, but this will change. Therefore add and use MONCODE_BUG instead of a hardcoded zero. Reviewed-by: Sven Schnelle <svens@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> |
||
Mike Rapoport (Microsoft)
|
9fac145b6d |
mm, arch: consolidate hugetlb CMA reservation
Every architecture that supports hugetlb_cma command line parameter reserves CMA areas for hugetlb during setup_arch(). This obfuscates the ordering of hugetlb CMA initialization with respect to the rest initialization of the core MM. Introduce arch_hugetlb_cma_order() callback to allow architectures report the desired order-per-bit of CMA areas and provide a week implementation of arch_hugetlb_cma_order() for architectures that don't support hugetlb with CMA. Use this callback in hugetlb_cma_reserve() instead if passing the order as parameter and call hugetlb_cma_reserve() from mm_core_init_early() rather than have it spread over architecture specific code. Link: https://lkml.kernel.org/r/20260111082105.290734-28-rppt@kernel.org Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org> Cc: Alexander Gordeev <agordeev@linux.ibm.com> Cc: Alex Shi <alexs@kernel.org> Cc: Andreas Larsson <andreas@gaisler.com> Cc: "Borislav Petkov (AMD)" <bp@alien8.de> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: David Hildenbrand <david@kernel.org> Cc: David S. Miller <davem@davemloft.net> Cc: Dinh Nguyen <dinguyen@kernel.org> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Guo Ren <guoren@kernel.org> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Helge Deller <deller@gmx.de> Cc: Huacai Chen <chenhuacai@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Johannes Berg <johannes@sipsolutions.net> Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Klara Modin <klarasmodin@gmail.com> Cc: Liam Howlett <liam.howlett@oracle.com> Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Cc: Magnus Lindholm <linmag7@gmail.com> Cc: Matt Turner <mattst88@gmail.com> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Hocko <mhocko@suse.com> Cc: Michal Simek <monstr@monstr.eu> Cc: Muchun Song <muchun.song@linux.dev> Cc: Oscar Salvador <osalvador@suse.de> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Pratyush Yadav <pratyush@kernel.org> Cc: Richard Weinberger <richard@nod.at> Cc: "Ritesh Harjani (IBM)" <ritesh.list@gmail.com> Cc: Russell King <linux@armlinux.org.uk> Cc: Stafford Horne <shorne@gmail.com> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Vineet Gupta <vgupta@kernel.org> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
||
Thomas Gleixner
|
99d2592023 |
rseq: Implement sys_rseq_slice_yield()
Provide a new syscall which has the only purpose to yield the CPU after the kernel granted a time slice extension. sched_yield() is not suitable for that because it unconditionally schedules, but the end of the time slice extension is not required to schedule when the task was already preempted. This also allows to have a strict check for termination to catch user space invoking random syscalls including sched_yield() from a time slice extension region. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Link: https://patch.msgid.link/20251215155708.929634896@linutronix.de |
||
Randy Dunlap
|
24c776355f |
kernel.h: drop hex.h and update all hex.h users
Remove <linux/hex.h> from <linux/kernel.h> and update all users/callers of hex.h interfaces to directly #include <linux/hex.h> as part of the process of putting kernel.h on a diet. Removing hex.h from kernel.h means that 36K C source files don't have to pay the price of parsing hex.h for the roughly 120 C source files that need it. This change has been build-tested with allmodconfig on most ARCHes. Also, all users/callers of <linux/hex.h> in the entire source tree have been updated if needed (if not already #included). Link: https://lkml.kernel.org/r/20251215005206.2362276-1-rdunlap@infradead.org Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Yury Norov (NVIDIA) <yury.norov@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
||
|
Heiko Carstens
|
576b1b7b11 |
s390/vdso: Disable kstack erase
For some reason gcc 8, 9, 10, and 11 generate a dynamic relocation in
vdso.so.dbg if CONFIG_KSTACK_ERASE is enabled:
>> arch/s390/kernel/vdso/vdso.so.dbg: dynamic relocations are not supported
make[3]: *** [arch/s390/kernel/vdso/Makefile:54: arch/s390/kernel/vdso/vdso.so.dbg] Error 1
$ readelf -rW arch/s390/kernel/vdso/vdso.so.dbg
Relocation section '.rela.dyn' at offset 0x15c0 contains 1 entry:
Offset Info Type Symbol's Value Symbol's Name + Addend
00000000000015f0 000000010000000b R_390_JMP_SLOT 0000000000000000 __sanitizer_cov_stack_depth + 0
Add $(DISABLE_KSTACK_ERASE) to vdso compile flags to fix this.
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/r/202601070505.xQcLr5KV-lkp@intel.com/
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
|
||
Thomas Weißschuh
|
7158fc54b2 |
vdso: Remove struct getcpu_cache
The cache parameter of getcpu() is useless nowadays for various reasons. * It is never passed by userspace for either the vDSO or syscalls. * It is never used by the kernel. * It could not be made to work on the current vDSO architecture. * The structure definition is not part of the UAPI headers. * vdso_getcpu() is superseded by restartable sequences in any case. Remove the struct and its header. As a side-effect this gets rid of an unwanted inclusion of the linux/ header namespace from vDSO code. [ tglx: Adapt to s390 upstream changes */ Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@kernel.org> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Heiko Carstens <hca@linux.ibm.com> # s390 Link: https://patch.msgid.link/20251230-getcpu_cache-v3-1-fb9c5f880ebe@linutronix.de |
||
Jens Remus
|
489e96651d |
s390/stacktrace: Do not fallback to RA register
The logic to fallback to the return address (RA) register value in the topmost frame when stack tracing using back chain is broken in multiple ways: When assuming the RA register 14 has not been saved yet one must assume that a new user stack frame has not been allocated either. Therefore the back chain would not contain the stack pointer (SP) at entry, but the caller's SP at its entry instead. Therefore when falling back to the RA register 14 value it would also be necessary to fallback to the SP register 15 value. Otherwise an invalid combination of RA register 14 and caller's SP at its entry (from the back chain) is used. In the topmost frame the back chain contains either the caller's SP at its entry (before having allocated a new stack frame in the prologue), the SP at entry (after having allocated a new stack frame), or an uninitialized value (during static/dynamic stack allocation). In both cases where the back chain is valid either the caller or prologue must have saved its respective RA to the respective frame. Therefore, if the RA obtained from the frame pointed to by the back chain is invalid, this does not indicate that the IP in the topmost frame is still early in the prologue and the RA has not been saved. Reviewed-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Jens Remus <jremus@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> |
||
Sven Schnelle
|
b1aa01d312 |
s390/ipl: Clear SBP flag when bootprog is set
With z16 a new flag 'search boot program' was introduced for list-directed IPL (SCSI, NVMe, ECKD DASD). If this flag is set, e.g. via selecting the "Automatic" value for the "Boot program selector" control on an HMC load panel, it is copied to the reipl structure from the initial ipl structure. When a user now sets a boot prog via sysfs, the flag is not cleared and the bootloader will again automatically select the boot program, ignoring user configuration. To avoid that, clear the SBP flag when a bootprog sysfs file is written. Cc: stable@vger.kernel.org Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com> Reviewed-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Sven Schnelle <svens@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> |
||
|
Linus Torvalds
|
51d90a15fe |
ARM:
- Support for userspace handling of synchronous external aborts (SEAs),
allowing the VMM to potentially handle the abort in a non-fatal
manner.
- Large rework of the VGIC's list register handling with the goal of
supporting more active/pending IRQs than available list registers in
hardware. In addition, the VGIC now supports EOImode==1 style
deactivations for IRQs which may occur on a separate vCPU than the
one that acked the IRQ.
- Support for FEAT_XNX (user / privileged execute permissions) and
FEAT_HAF (hardware update to the Access Flag) in the software page
table walkers and shadow MMU.
- Allow page table destruction to reschedule, fixing long need_resched
latencies observed when destroying a large VM.
- Minor fixes to KVM and selftests
Loongarch:
- Get VM PMU capability from HW GCFG register.
- Add AVEC basic support.
- Use 64-bit register definition for EIOINTC.
- Add KVM timer test cases for tools/selftests.
RISC/V:
- SBI message passing (MPXY) support for KVM guest
- Give a new, more specific error subcode for the case when in-kernel
AIA virtualization fails to allocate IMSIC VS-file
- Support KVM_DIRTY_LOG_INITIALLY_SET, enabling dirty log gradually
in small chunks
- Fix guest page fault within HLV* instructions
- Flush VS-stage TLB after VCPU migration for Andes cores
s390:
- Always allocate ESCA (Extended System Control Area), instead of
starting with the basic SCA and converting to ESCA with the
addition of the 65th vCPU. The price is increased number of
exits (and worse performance) on z10 and earlier processor;
ESCA was introduced by z114/z196 in 2010.
- VIRT_XFER_TO_GUEST_WORK support
- Operation exception forwarding support
- Cleanups
x86:
- Skip the costly "zap all SPTEs" on an MMIO generation wrap if MMIO SPTE
caching is disabled, as there can't be any relevant SPTEs to zap.
- Relocate a misplaced export.
- Fix an async #PF bug where KVM would clear the completion queue when the
guest transitioned in and out of paging mode, e.g. when handling an SMI and
then returning to paged mode via RSM.
- Leave KVM's user-return notifier registered even when disabling
virtualization, as long as kvm.ko is loaded. On reboot/shutdown, keeping
the notifier registered is ok; the kernel does not use the MSRs and the
callback will run cleanly and restore host MSRs if the CPU manages to
return to userspace before the system goes down.
- Use the checked version of {get,put}_user().
- Fix a long-lurking bug where KVM's lack of catch-up logic for periodic APIC
timers can result in a hard lockup in the host.
- Revert the periodic kvmclock sync logic now that KVM doesn't use a
clocksource that's subject to NTP corrections.
- Clean up KVM's handling of MMIO Stale Data and L1TF, and bury the latter
behind CONFIG_CPU_MITIGATIONS.
- Context switch XCR0, XSS, and PKRU outside of the entry/exit fast path;
the only reason they were handled in the fast path was to paper of a bug
in the core #MC code, and that has long since been fixed.
- Add emulator support for AVX MOV instructions, to play nice with emulated
devices whose guest drivers like to access PCI BARs with large multi-byte
instructions.
x86 (AMD):
- Fix a few missing "VMCB dirty" bugs.
- Fix the worst of KVM's lack of EFER.LMSLE emulation.
- Add AVIC support for addressing 4k vCPUs in x2AVIC mode.
- Fix incorrect handling of selective CR0 writes when checking intercepts
during emulation of L2 instructions.
- Fix a currently-benign bug where KVM would clobber SPEC_CTRL[63:32] on
VMRUN and #VMEXIT.
- Fix a bug where KVM corrupt the guest code stream when re-injecting a soft
interrupt if the guest patched the underlying code after the VM-Exit, e.g.
when Linux patches code with a temporary INT3.
- Add KVM_X86_SNP_POLICY_BITS to advertise supported SNP policy bits to
userspace, and extend KVM "support" to all policy bits that don't require
any actual support from KVM.
x86 (Intel):
- Use the root role from kvm_mmu_page to construct EPTPs instead of the
current vCPU state, partly as worthwhile cleanup, but mostly to pave the
way for tracking per-root TLB flushes, and elide EPT flushes on pCPU
migration if the root is clean from a previous flush.
- Add a few missing nested consistency checks.
- Rip out support for doing "early" consistency checks via hardware as the
functionality hasn't been used in years and is no longer useful in general;
replace it with an off-by-default module param to WARN if hardware fails
a check that KVM does not perform.
- Fix a currently-benign bug where KVM would drop the guest's SPEC_CTRL[63:32]
on VM-Enter.
- Misc cleanups.
- Overhaul the TDX code to address systemic races where KVM (acting on behalf
of userspace) could inadvertantly trigger lock contention in the TDX-Module;
KVM was either working around these in weird, ugly ways, or was simply
oblivious to them (though even Yan's devilish selftests could only break
individual VMs, not the host kernel)
- Fix a bug where KVM could corrupt a vCPU's cpu_list when freeing a TDX vCPU,
if creating said vCPU failed partway through.
- Fix a few sparse warnings (bad annotation, 0 != NULL).
- Use struct_size() to simplify copying TDX capabilities to userspace.
- Fix a bug where TDX would effectively corrupt user-return MSR values if the
TDX Module rejects VP.ENTER and thus doesn't clobber host MSRs as expected.
Selftests:
- Fix a math goof in mmu_stress_test when running on a single-CPU system/VM.
- Forcefully override ARCH from x86_64 to x86 to play nice with specifying
ARCH=x86_64 on the command line.
- Extend a bunch of nested VMX to validate nested SVM as well.
- Add support for LA57 in the core VM_MODE_xxx macro, and add a test to
verify KVM can save/restore nested VMX state when L1 is using 5-level
paging, but L2 is not.
- Clean up the guest paging code in anticipation of sharing the core logic for
nested EPT and nested NPT.
guest_memfd:
- Add NUMA mempolicy support for guest_memfd, and clean up a variety of
rough edges in guest_memfd along the way.
- Define a CLASS to automatically handle get+put when grabbing a guest_memfd
from a memslot to make it harder to leak references.
- Enhance KVM selftests to make it easer to develop and debug selftests like
those added for guest_memfd NUMA support, e.g. where test and/or KVM bugs
often result in hard-to-debug SIGBUS errors.
- Misc cleanups.
Generic:
- Use the recently-added WQ_PERCPU when creating the per-CPU workqueue for
irqfd cleanup.
- Fix a goof in the dirty ring documentation.
- Fix choice of target for directed yield across different calls to
kvm_vcpu_on_spin(); the function was always starting from the first
vCPU instead of continuing the round-robin search.
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Pull KVM updates from Paolo Bonzini:
"ARM:
- Support for userspace handling of synchronous external aborts
(SEAs), allowing the VMM to potentially handle the abort in a
non-fatal manner
- Large rework of the VGIC's list register handling with the goal of
supporting more active/pending IRQs than available list registers
in hardware. In addition, the VGIC now supports EOImode==1 style
deactivations for IRQs which may occur on a separate vCPU than the
one that acked the IRQ
- Support for FEAT_XNX (user / privileged execute permissions) and
FEAT_HAF (hardware update to the Access Flag) in the software page
table walkers and shadow MMU
- Allow page table destruction to reschedule, fixing long
need_resched latencies observed when destroying a large VM
- Minor fixes to KVM and selftests
Loongarch:
- Get VM PMU capability from HW GCFG register
- Add AVEC basic support
- Use 64-bit register definition for EIOINTC
- Add KVM timer test cases for tools/selftests
RISC/V:
- SBI message passing (MPXY) support for KVM guest
- Give a new, more specific error subcode for the case when in-kernel
AIA virtualization fails to allocate IMSIC VS-file
- Support KVM_DIRTY_LOG_INITIALLY_SET, enabling dirty log gradually
in small chunks
- Fix guest page fault within HLV* instructions
- Flush VS-stage TLB after VCPU migration for Andes cores
s390:
- Always allocate ESCA (Extended System Control Area), instead of
starting with the basic SCA and converting to ESCA with the
addition of the 65th vCPU. The price is increased number of exits
(and worse performance) on z10 and earlier processor; ESCA was
introduced by z114/z196 in 2010
- VIRT_XFER_TO_GUEST_WORK support
- Operation exception forwarding support
- Cleanups
x86:
- Skip the costly "zap all SPTEs" on an MMIO generation wrap if MMIO
SPTE caching is disabled, as there can't be any relevant SPTEs to
zap
- Relocate a misplaced export
- Fix an async #PF bug where KVM would clear the completion queue
when the guest transitioned in and out of paging mode, e.g. when
handling an SMI and then returning to paged mode via RSM
- Leave KVM's user-return notifier registered even when disabling
virtualization, as long as kvm.ko is loaded. On reboot/shutdown,
keeping the notifier registered is ok; the kernel does not use the
MSRs and the callback will run cleanly and restore host MSRs if the
CPU manages to return to userspace before the system goes down
- Use the checked version of {get,put}_user()
- Fix a long-lurking bug where KVM's lack of catch-up logic for
periodic APIC timers can result in a hard lockup in the host
- Revert the periodic kvmclock sync logic now that KVM doesn't use a
clocksource that's subject to NTP corrections
- Clean up KVM's handling of MMIO Stale Data and L1TF, and bury the
latter behind CONFIG_CPU_MITIGATIONS
- Context switch XCR0, XSS, and PKRU outside of the entry/exit fast
path; the only reason they were handled in the fast path was to
paper of a bug in the core #MC code, and that has long since been
fixed
- Add emulator support for AVX MOV instructions, to play nice with
emulated devices whose guest drivers like to access PCI BARs with
large multi-byte instructions
x86 (AMD):
- Fix a few missing "VMCB dirty" bugs
- Fix the worst of KVM's lack of EFER.LMSLE emulation
- Add AVIC support for addressing 4k vCPUs in x2AVIC mode
- Fix incorrect handling of selective CR0 writes when checking
intercepts during emulation of L2 instructions
- Fix a currently-benign bug where KVM would clobber SPEC_CTRL[63:32]
on VMRUN and #VMEXIT
- Fix a bug where KVM corrupt the guest code stream when re-injecting
a soft interrupt if the guest patched the underlying code after the
VM-Exit, e.g. when Linux patches code with a temporary INT3
- Add KVM_X86_SNP_POLICY_BITS to advertise supported SNP policy bits
to userspace, and extend KVM "support" to all policy bits that
don't require any actual support from KVM
x86 (Intel):
- Use the root role from kvm_mmu_page to construct EPTPs instead of
the current vCPU state, partly as worthwhile cleanup, but mostly to
pave the way for tracking per-root TLB flushes, and elide EPT
flushes on pCPU migration if the root is clean from a previous
flush
- Add a few missing nested consistency checks
- Rip out support for doing "early" consistency checks via hardware
as the functionality hasn't been used in years and is no longer
useful in general; replace it with an off-by-default module param
to WARN if hardware fails a check that KVM does not perform
- Fix a currently-benign bug where KVM would drop the guest's
SPEC_CTRL[63:32] on VM-Enter
- Misc cleanups
- Overhaul the TDX code to address systemic races where KVM (acting
on behalf of userspace) could inadvertantly trigger lock contention
in the TDX-Module; KVM was either working around these in weird,
ugly ways, or was simply oblivious to them (though even Yan's
devilish selftests could only break individual VMs, not the host
kernel)
- Fix a bug where KVM could corrupt a vCPU's cpu_list when freeing a
TDX vCPU, if creating said vCPU failed partway through
- Fix a few sparse warnings (bad annotation, 0 != NULL)
- Use struct_size() to simplify copying TDX capabilities to userspace
- Fix a bug where TDX would effectively corrupt user-return MSR
values if the TDX Module rejects VP.ENTER and thus doesn't clobber
host MSRs as expected
Selftests:
- Fix a math goof in mmu_stress_test when running on a single-CPU
system/VM
- Forcefully override ARCH from x86_64 to x86 to play nice with
specifying ARCH=x86_64 on the command line
- Extend a bunch of nested VMX to validate nested SVM as well
- Add support for LA57 in the core VM_MODE_xxx macro, and add a test
to verify KVM can save/restore nested VMX state when L1 is using
5-level paging, but L2 is not
- Clean up the guest paging code in anticipation of sharing the core
logic for nested EPT and nested NPT
guest_memfd:
- Add NUMA mempolicy support for guest_memfd, and clean up a variety
of rough edges in guest_memfd along the way
- Define a CLASS to automatically handle get+put when grabbing a
guest_memfd from a memslot to make it harder to leak references
- Enhance KVM selftests to make it easer to develop and debug
selftests like those added for guest_memfd NUMA support, e.g. where
test and/or KVM bugs often result in hard-to-debug SIGBUS errors
- Misc cleanups
Generic:
- Use the recently-added WQ_PERCPU when creating the per-CPU
workqueue for irqfd cleanup
- Fix a goof in the dirty ring documentation
- Fix choice of target for directed yield across different calls to
kvm_vcpu_on_spin(); the function was always starting from the first
vCPU instead of continuing the round-robin search"
* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (260 commits)
KVM: arm64: at: Update AF on software walk only if VM has FEAT_HAFDBS
KVM: arm64: at: Use correct HA bit in TCR_EL2 when regime is EL2
KVM: arm64: Document KVM_PGTABLE_PROT_{UX,PX}
KVM: arm64: Fix spelling mistake "Unexpeced" -> "Unexpected"
KVM: arm64: Add break to default case in kvm_pgtable_stage2_pte_prot()
KVM: arm64: Add endian casting to kvm_swap_s[12]_desc()
KVM: arm64: Fix compilation when CONFIG_ARM64_USE_LSE_ATOMICS=n
KVM: arm64: selftests: Add test for AT emulation
KVM: arm64: nv: Expose hardware access flag management to NV guests
KVM: arm64: nv: Implement HW access flag management in stage-2 SW PTW
KVM: arm64: Implement HW access flag management in stage-1 SW PTW
KVM: arm64: Propagate PTW errors up to AT emulation
KVM: arm64: Add helper for swapping guest descriptor
KVM: arm64: nv: Use pgtable definitions in stage-2 walk
KVM: arm64: Handle endianness in read helper for emulated PTW
KVM: arm64: nv: Stop passing vCPU through void ptr in S2 PTW
KVM: arm64: Call helper for reading descriptors directly
KVM: arm64: nv: Advertise support for FEAT_XNX
KVM: arm64: Teach ptdump about FEAT_XNX permissions
KVM: s390: Use generic VIRT_XFER_TO_GUEST_WORK functions
...
|
||
|
Linus Torvalds
|
2547f79b0b |
s390 updates for 6.19 merge window
- Provide a new interface for dynamic configuration and deconfiguration of hotplug memory, allowing with and without memmap_on_memory support. This makes the way memory hotplug is handled on s390 much more similar to other architectures - Remove compat support. There shouldn't be any compat user space around anymore, therefore get rid of a lot of code which also doesn't need to be tested anymore - Add stackprotector support. GCC 16 will get new compiler options, which allow to generate code required for kernel stackprotector support - Merge pai_crypto and pai_ext PMU drivers into a new driver. This removes a lot of duplicated code. The new driver is also extendable and allows to support new PMUs - Add driver override support for AP queues - Rework and extend zcrypt and AP trace events to allow for tracing of crypto requests - Support block sizes larger than 65535 bytes for CCW tape devices - Since the rework of the virtual kernel address space the module area and the kernel image are within the same 4GB area. This eliminates the need of weak per cpu variables. Get rid of ARCH_MODULE_NEEDS_WEAK_PER_CPU - Various other small improvements and fixes -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEECMNfWEw3SLnmiLkZIg7DeRspbsIFAmktZioACgkQIg7DeRsp bsK4Rw//VzkvHyzOtGKZ8Hb4S+Sh/PFlaZQXNhj+Xt5gWoOhP1uPmmhBe6LxjYaB J9Ns3hpONQ1dTHV7VVkds8FvM/SBcGe8m5RpefmChC/bjm5UEOV/MppKtA0aLnEH hJmdubIrrRAXKggxlHEfRLzBsFvV/rJ9Xf16FhRxGDc4pgmgkI1NPQ41/dyCHklQ dB3YrFVPIETywVYYVB/G3h11JgF5Z6CKtjYCdSx72Fkbj65+6JPfcPgLKMpcJuPd UxUXtCo1FCXlP70jsz8JQI8cdieG0KDQTtnZP4P/pqjQ3wirOqvMewNa9t9xmQ2e p6Rc1Vx5DESkq9bRWtQEaprTVVzK7DDLH3RuZwB+uLrcLGD8JvVS6/m9n9CgzBMT BnJXG2sLZH+gdQy+DSD/fVDD7OvIk8TGrH+OFwVIKhrT/J3B2E7ZSYyZZCNIS7VG yiuypoDGYg3ZpYjH9+qOXWB3nc0vQWrlFzb1bsQu1omJGmunLv4jtTjAKGN82C33 auBsIYAlQW20X7DV0vZa59PwqwtBqtdQQcTidwtSztzKogRXAdK8KKHtN60JM4S2 7sWFOFCQaTChAeDNw6MF5EtULb551nwH2RtJ9x3CrJj+OGK6clbQNcxIA7Oy0veR Sl9v1lMfeKOgDrPdDy3ArQBJ8WLlF9qX9wLKbiaNyIKmkz2ymkg= =CNrb -----END PGP SIGNATURE----- Merge tag 's390-6.19-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux Pull s390 updates from Heiko Carstens: - Provide a new interface for dynamic configuration and deconfiguration of hotplug memory, allowing with and without memmap_on_memory support. This makes the way memory hotplug is handled on s390 much more similar to other architectures - Remove compat support. There shouldn't be any compat user space around anymore, therefore get rid of a lot of code which also doesn't need to be tested anymore - Add stackprotector support. GCC 16 will get new compiler options, which allow to generate code required for kernel stackprotector support - Merge pai_crypto and pai_ext PMU drivers into a new driver. This removes a lot of duplicated code. The new driver is also extendable and allows to support new PMUs - Add driver override support for AP queues - Rework and extend zcrypt and AP trace events to allow for tracing of crypto requests - Support block sizes larger than 65535 bytes for CCW tape devices - Since the rework of the virtual kernel address space the module area and the kernel image are within the same 4GB area. This eliminates the need of weak per cpu variables. Get rid of ARCH_MODULE_NEEDS_WEAK_PER_CPU - Various other small improvements and fixes * tag 's390-6.19-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (92 commits) watchdog: diag288_wdt: Remove KMSG_COMPONENT macro s390/entry: Use lay instead of aghik s390/vdso: Get rid of -m64 flag handling s390/vdso: Rename vdso64 to vdso s390: Rename head64.S to head.S s390/vdso: Use common STABS_DEBUG and DWARF_DEBUG macros s390: Add stackprotector support s390/modules: Simplify module_finalize() slightly s390: Remove KMSG_COMPONENT macro s390/percpu: Get rid of ARCH_MODULE_NEEDS_WEAK_PER_CPU s390/ap: Restrict driver_override versus apmask and aqmask use s390/ap: Rename mutex ap_perms_mutex to ap_attr_mutex s390/ap: Support driver_override for AP queue devices s390/ap: Use all-bits-one apmask/aqmask for vfio in_use() checks s390/debug: Update description of resize operation s390/syscalls: Switch to generic system call table generation s390/syscalls: Remove system call table pointer from thread_struct s390/uapi: Remove 31 bit support from uapi header files s390: Remove compat support tools: Remove s390 compat support ... |
||
|
Linus Torvalds
|
63e6995005 |
objtool updates for v6.19:
- klp-build livepatch module generation (Josh Poimboeuf)
Introduce new objtool features and a klp-build
script to generate livepatch modules using a
source .patch as input.
This builds on concepts from the longstanding out-of-tree
kpatch project which began in 2012 and has been used for
many years to generate livepatch modules for production kernels.
However, this is a complete rewrite which incorporates
hard-earned lessons from 12+ years of maintaining kpatch.
Key improvements compared to kpatch-build:
- Integrated with objtool: Leverages objtool's existing control-flow
graph analysis to help detect changed functions.
- Works on vmlinux.o: Supports late-linked objects, making it
compatible with LTO, IBT, and similar.
- Simplified code base: ~3k fewer lines of code.
- Upstream: No more out-of-tree #ifdef hacks, far less cruft.
- Cleaner internals: Vastly simplified logic for symbol/section/reloc
inclusion and special section extraction.
- Robust __LINE__ macro handling: Avoids false positive binary diffs
caused by the __LINE__ macro by introducing a fix-patch-lines script
which injects #line directives into the source .patch to preserve
the original line numbers at compile time.
- Disassemble code with libopcodes instead of running objdump
(Alexandre Chartre)
- Disassemble support (-d option to objtool) by Alexandre Chartre,
which supports the decoding of various Linux kernel code generation
specials such as alternatives:
17ef: sched_balance_find_dst_group+0x62f mov 0x34(%r9),%edx
17f3: sched_balance_find_dst_group+0x633 | <alternative.17f3> | X86_FEATURE_POPCNT
17f3: sched_balance_find_dst_group+0x633 | call 0x17f8 <__sw_hweight64> | popcnt %rdi,%rax
17f8: sched_balance_find_dst_group+0x638 cmp %eax,%edx
... jump table alternatives:
1895: sched_use_asym_prio+0x5 test $0x8,%ch
1898: sched_use_asym_prio+0x8 je 0x18a9 <sched_use_asym_prio+0x19>
189a: sched_use_asym_prio+0xa | <jump_table.189a> | JUMP
189a: sched_use_asym_prio+0xa | jmp 0x18ae <sched_use_asym_prio+0x1e> | nop2
189c: sched_use_asym_prio+0xc mov $0x1,%eax
18a1: sched_use_asym_prio+0x11 and $0x80,%ecx
... exception table alternatives:
native_read_msr:
5b80: native_read_msr+0x0 mov %edi,%ecx
5b82: native_read_msr+0x2 | <ex_table.5b82> | EXCEPTION
5b82: native_read_msr+0x2 | rdmsr | resume at 0x5b84 <native_read_msr+0x4>
5b84: native_read_msr+0x4 shl $0x20,%rdx
.... x86 feature flag decoding (also see the X86_FEATURE_POPCNT
example in sched_balance_find_dst_group() above):
2faaf: start_thread_common.constprop.0+0x1f jne 0x2fba4 <start_thread_common.constprop.0+0x114>
2fab5: start_thread_common.constprop.0+0x25 | <alternative.2fab5> | X86_FEATURE_ALWAYS | X86_BUG_NULL_SEG
2fab5: start_thread_common.constprop.0+0x25 | jmp 0x2faba <.altinstr_aux+0x2f4> | jmp 0x4b0 <start_thread_common.constprop.0+0x3f> | nop5
2faba: start_thread_common.constprop.0+0x2a mov $0x2b,%eax
... NOP sequence shortening:
1048e2: snapshot_write_finalize+0xc2 je 0x104917 <snapshot_write_finalize+0xf7>
1048e4: snapshot_write_finalize+0xc4 nop6
1048ea: snapshot_write_finalize+0xca nop11
1048f5: snapshot_write_finalize+0xd5 nop11
104900: snapshot_write_finalize+0xe0 mov %rax,%rcx
104903: snapshot_write_finalize+0xe3 mov 0x10(%rdx),%rax
... and much more.
- Function validation tracing support (Alexandre Chartre)
- Various -ffunction-sections fixes (Josh Poimboeuf)
- Clang AutoFDO (Automated Feedback-Directed Optimizations) support (Josh Poimboeuf)
- Misc fixes and cleanups (Borislav Petkov, Chen Ni,
Dylan Hatch, Ingo Molnar, John Wang, Josh Poimboeuf,
Pankaj Raghav, Peter Zijlstra, Thorsten Blum)
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'objtool-core-2025-12-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull objtool updates from Ingo Molnar:
- klp-build livepatch module generation (Josh Poimboeuf)
Introduce new objtool features and a klp-build script to generate
livepatch modules using a source .patch as input.
This builds on concepts from the longstanding out-of-tree kpatch
project which began in 2012 and has been used for many years to
generate livepatch modules for production kernels. However, this is a
complete rewrite which incorporates hard-earned lessons from 12+
years of maintaining kpatch.
Key improvements compared to kpatch-build:
- Integrated with objtool: Leverages objtool's existing control-flow
graph analysis to help detect changed functions.
- Works on vmlinux.o: Supports late-linked objects, making it
compatible with LTO, IBT, and similar.
- Simplified code base: ~3k fewer lines of code.
- Upstream: No more out-of-tree #ifdef hacks, far less cruft.
- Cleaner internals: Vastly simplified logic for
symbol/section/reloc inclusion and special section extraction.
- Robust __LINE__ macro handling: Avoids false positive binary diffs
caused by the __LINE__ macro by introducing a fix-patch-lines
script which injects #line directives into the source .patch to
preserve the original line numbers at compile time.
- Disassemble code with libopcodes instead of running objdump
(Alexandre Chartre)
- Disassemble support (-d option to objtool) by Alexandre Chartre,
which supports the decoding of various Linux kernel code generation
specials such as alternatives:
17ef: sched_balance_find_dst_group+0x62f mov 0x34(%r9),%edx
17f3: sched_balance_find_dst_group+0x633 | <alternative.17f3> | X86_FEATURE_POPCNT
17f3: sched_balance_find_dst_group+0x633 | call 0x17f8 <__sw_hweight64> | popcnt %rdi,%rax
17f8: sched_balance_find_dst_group+0x638 cmp %eax,%edx
... jump table alternatives:
1895: sched_use_asym_prio+0x5 test $0x8,%ch
1898: sched_use_asym_prio+0x8 je 0x18a9 <sched_use_asym_prio+0x19>
189a: sched_use_asym_prio+0xa | <jump_table.189a> | JUMP
189a: sched_use_asym_prio+0xa | jmp 0x18ae <sched_use_asym_prio+0x1e> | nop2
189c: sched_use_asym_prio+0xc mov $0x1,%eax
18a1: sched_use_asym_prio+0x11 and $0x80,%ecx
... exception table alternatives:
native_read_msr:
5b80: native_read_msr+0x0 mov %edi,%ecx
5b82: native_read_msr+0x2 | <ex_table.5b82> | EXCEPTION
5b82: native_read_msr+0x2 | rdmsr | resume at 0x5b84 <native_read_msr+0x4>
5b84: native_read_msr+0x4 shl $0x20,%rdx
.... x86 feature flag decoding (also see the X86_FEATURE_POPCNT
example in sched_balance_find_dst_group() above):
2faaf: start_thread_common.constprop.0+0x1f jne 0x2fba4 <start_thread_common.constprop.0+0x114>
2fab5: start_thread_common.constprop.0+0x25 | <alternative.2fab5> | X86_FEATURE_ALWAYS | X86_BUG_NULL_SEG
2fab5: start_thread_common.constprop.0+0x25 | jmp 0x2faba <.altinstr_aux+0x2f4> | jmp 0x4b0 <start_thread_common.constprop.0+0x3f> | nop5
2faba: start_thread_common.constprop.0+0x2a mov $0x2b,%eax
... NOP sequence shortening:
1048e2: snapshot_write_finalize+0xc2 je 0x104917 <snapshot_write_finalize+0xf7>
1048e4: snapshot_write_finalize+0xc4 nop6
1048ea: snapshot_write_finalize+0xca nop11
1048f5: snapshot_write_finalize+0xd5 nop11
104900: snapshot_write_finalize+0xe0 mov %rax,%rcx
104903: snapshot_write_finalize+0xe3 mov 0x10(%rdx),%rax
... and much more.
- Function validation tracing support (Alexandre Chartre)
- Various -ffunction-sections fixes (Josh Poimboeuf)
- Clang AutoFDO (Automated Feedback-Directed Optimizations) support
(Josh Poimboeuf)
- Misc fixes and cleanups (Borislav Petkov, Chen Ni, Dylan Hatch, Ingo
Molnar, John Wang, Josh Poimboeuf, Pankaj Raghav, Peter Zijlstra,
Thorsten Blum)
* tag 'objtool-core-2025-12-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (129 commits)
objtool: Fix segfault on unknown alternatives
objtool: Build with disassembly can fail when including bdf.h
objtool: Trim trailing NOPs in alternative
objtool: Add wide output for disassembly
objtool: Compact output for alternatives with one instruction
objtool: Improve naming of group alternatives
objtool: Add Function to get the name of a CPU feature
objtool: Provide access to feature and flags of group alternatives
objtool: Fix address references in alternatives
objtool: Disassemble jump table alternatives
objtool: Disassemble exception table alternatives
objtool: Print addresses with alternative instructions
objtool: Disassemble group alternatives
objtool: Print headers for alternatives
objtool: Preserve alternatives order
objtool: Add the --disas=<function-pattern> action
objtool: Do not validate IBT for .return_sites and .call_sites
objtool: Improve tracing of alternative instructions
objtool: Add functions to better name alternatives
objtool: Identify the different types of alternatives
...
|
||
|
Heiko Carstens
|
d0139059e3 |
KVM: s390: Enable and disable interrupts in entry code
Move enabling and disabling of interrupts around the SIE instruction to entry code. Enabling interrupts only after the __TI_sie flag has been set guarantees that the SIE instruction is not executed if an interrupt happens between enabling interrupts and the execution of the SIE instruction. Interrupt handlers and machine check handler forward the PSW to the sie_exit label in such cases. This is a prerequisite for VIRT_XFER_TO_GUEST_WORK to prevent that guest context is entered when e.g. a scheduler IPI, indicating that a reschedule is required, happens right before the SIE instruction, which could lead to long delays. Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Tested-by: Andrew Donnellan <ajd@linux.ibm.com> Signed-off-by: Andrew Donnellan <ajd@linux.ibm.com> Reviewed-by: Janosch Frank <frankja@linux.ibm.com> Signed-off-by: Janosch Frank <frankja@linux.ibm.com> |
||
|
Heiko Carstens
|
1c93edfd50 |
s390/entry: Use lay instead of aghik
Use the lay instruction instead of aghik. aghik is only available since
z196, therefore compiling the kernel for z10 results in this error:
arch/s390/kernel/entry.S: Assembler messages:
arch/s390/kernel/entry.S:165: Error: Unrecognized opcode: `aghik'
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202511261518.nBbQN5h7-lkp@intel.com/
Fixes:
|
||
|
Heiko Carstens
|
509c34924d |
s390/vdso: Get rid of -m64 flag handling
The compiler/assembler flag -m64 is added and removed at two locations. This pointless exercise is a leftover to keep the 31 and 64 bit vdso Makefiles as symmetrical as possible. Given that the 31 bit vdso code does not exist anymore, remove the -m64 flag handling. Suggested-by: Jens Remus <jremus@linux.ibm.com> Reviewed-by: Jens Remus <jremus@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> |
||
|
Heiko Carstens
|
c0087d807a |
s390/vdso: Rename vdso64 to vdso
Since compat is gone there is only a 64 bit vdso left. Remove the superfluous "64" suffix everywhere. Reviewed-by: Jens Remus <jremus@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> |
||
|
Heiko Carstens
|
b3bdfdf1f9 |
s390: Rename head64.S to head.S
All the code is 64 bit, therefore remove the superfluous suffix. Reviewed-by: Jens Remus <jremus@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> |
||
|
Jens Remus
|
5e811b922e |
s390/vdso: Use common STABS_DEBUG and DWARF_DEBUG macros
This simplifies the vDSO linker script. The ELF_DETAILS macro was not used in addition, as done on arm64 and powerpc, as that would introduce an empty .modinfo section. Note that this rearranges the .comment section to follow after all of the debug sections. Signed-off-by: Jens Remus <jremus@linux.ibm.com> Reviewed-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> |