Maxim Levitsky 32f4a5c83c locking/mutex: implement mutex_lock_killable_nest_lock ... JIRA: https://issues.redhat.com/browse/RHEL-95318 commit fb49f07ba1d9d8c9bd8854878ae6b5b21ff9ac45 Author: Maxim Levitsky <mlevitsk@redhat.com> Date: Mon May 12 14:04:03 2025 -0400 locking/mutex: implement mutex_lock_killable_nest_lock KVM's SEV intra-host migration code needs to lock all vCPUs of the source and the target VM, before it proceeds with the migration. The number of vCPUs that belong to each VM is not bounded by anything except a self-imposed KVM limit of CONFIG_KVM_MAX_NR_VCPUS vCPUs which is significantly larger than the depth of lockdep's lock stack. Luckily, the locks in both of the cases mentioned above, are held under the 'kvm->lock' of each VM, which means that we can use the little known lockdep feature called a "nest_lock" to support this use case in a cleaner way, compared to the way it's currently done. Implement and expose 'mutex_lock_killable_nest_lock' for this purpose. Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Message-ID: <20250512180407.659015-3-mlevitsk@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>		2025-07-16 12:16:05 +02:00
..
bpf	bpf: skip non exist keys in generic_map_lookup_batch	2025-07-01 09:49:40 +02:00
cgroup	KVM: TDX: Register TDX host key IDs to cgroup misc controller	2025-07-15 19:12:38 +02:00
configs	mm/slab: rename CONFIG_SLAB to CONFIG_SLAB_DEPRECATED	2024-09-05 20:35:59 -04:00
debug	…
dma	dma-mapping: fix swapped dir/flags arguments to trace_dma_alloc_sgt_err	2025-04-03 09:22:41 -07:00
entry	…
events	perf: Avoid the read if the count is already updated	2025-06-23 14:54:27 +02:00
futex	fault-inject: improve build for CONFIG_FAULT_INJECTION=n	2024-12-17 22:59:23 +01:00
gcov	…
irq	genirq/msi: Silence 'set affinity failed' warning	2025-02-18 09:48:09 -07:00
kcsan	…
livepatch	livepatch: Add stack_order sysfs attribute	2025-04-03 13:23:15 -04:00
locking	locking/mutex: implement mutex_lock_killable_nest_lock	2025-07-16 12:16:05 +02:00
module	module, bpf: Store BTF base pointer in struct module	2024-11-26 15:55:10 +01:00
power	arm64: Use SYSTEM_OFF2 PSCI call to power off for hibernate	2025-04-10 08:35:33 -04:00
printk	Flush console log from kernel_power_off()	2025-05-02 11:11:41 -04:00
rcu	rcu/kvfree: Fix data-race in __mod_timer / kvfree_call_rcu	2025-01-08 17:48:13 -05:00
sched	Merge: Sched: late fixes for 9.7	2025-07-07 16:55:57 -03:00
time	Merge: Scheduler updates for 9.7	2025-03-12 14:53:01 -03:00
trace	bpf: Use preempt_count() directly in bpf_send_signal_common()	2025-07-01 09:49:40 +02:00
.gitignore	…
Kconfig.freezer	…
Kconfig.hz	…
Kconfig.kexec	crash: clean up kdump related config items	2024-12-23 09:35:35 +08:00
Kconfig.locks	…
Kconfig.preempt	…
Makefile	Merge: RHEL9.6 drm backport dependencies	2025-01-06 08:26:14 +00:00
acct.c	acct: perform last write from workqueue	2025-04-16 23:24:17 -04:00
async.c	…
audit.c	audit: Reorganize kerneldoc parameter names	2025-05-21 13:27:22 -03:00
audit.h	…
audit_fsnotify.c	…
audit_tree.c	audit: Annotate struct audit_chunk with __counted_by	2024-07-04 14:52:57 -03:00
audit_watch.c	…
auditfilter.c	audit: fix suffixed '/' filename matching	2025-05-21 13:27:45 -03:00
auditsc.c	audit: Use str_yes_no() helper function	2025-05-21 13:27:26 -03:00
backtracetest.c	…
bounds.c	…
capability.c	fs: port i_{g,u}id_into_vfs{g,u}id() to mnt_idmap	2024-10-16 11:02:01 +08:00
cfi.c	…
compat.c	…
configs.c	…
context_tracking.c	…
cpu.c	lazy tlb: fix hotplug exit race with MMU_LAZY_TLB_SHOOTDOWN	2025-03-13 17:06:59 -03:00
cpu_pm.c	…
crash_core.c	Document/kexec: generalize crash hotplug description	2024-12-23 09:35:36 +08:00
crash_reserve.c	crash: add prefix for crash dumping messages	2024-12-23 09:35:36 +08:00
cred.c	…
delayacct.c	delayacct: track delays from IRQ/SOFTIRQ	2024-07-15 11:12:08 -04:00
dma.c	…
elfcorehdr.c	crash: remove dependency of FA_DUMP on CRASH_DUMP	2024-12-23 09:35:35 +08:00
exec_domain.c	…
exit.c	lazy tlb: introduce lazy tlb mm refcount helper functions	2024-11-04 09:14:17 -05:00
exit.h	exit: add internal include file with helpers	2024-07-02 09:45:34 -04:00
extable.c	…
fail_function.c	…
fork.c	cgroup/cpuset: Remove cpuset_slab_spread_rotor	2025-04-28 10:54:33 +01:00
freezer.c	…
gen_kheaders.sh	…
groups.c	…
hung_task.c	…
iomem.c	mm: move is_ioremap_addr() into new header file	2024-10-01 11:17:52 -04:00
irq_work.c	…
jump_label.c	jump_label: Fix static_key_slow_dec() yet again	2025-04-20 20:01:13 -04:00
kallsyms.c	…
kallsyms_internal.h	…
kallsyms_selftest.c	…
kallsyms_selftest.h	…
kcmp.c	…
kcov.c	…
kexec.c	crash: add a new kexec flag for hotplug support	2024-12-23 09:35:36 +08:00
kexec_core.c	crash: split crash dumping code out from kexec_core.c	2024-12-23 09:35:35 +08:00
kexec_elf.c	…
kexec_file.c	kexec_file: fix elfcorehdr digest exclusion when CONFIG_CRASH_HOTPLUG=y	2024-12-23 09:35:36 +08:00
kexec_internal.h	crash: remove dependency of FA_DUMP on CRASH_DUMP	2024-12-23 09:35:35 +08:00
kheaders.c	…
kprobes.c	fprobe: Pass return address to the handlers	2024-10-25 09:07:32 +02:00
ksyms_common.c	…
ksysfs.c	crash: split crash dumping code out from kexec_core.c	2024-12-23 09:35:35 +08:00
kthread.c	kthread: unpark only parked kthread	2024-11-25 12:31:48 +00:00
latencytop.c	…
module_signature.c	…
notifier.c	…
nsproxy.c	…
padata.c	padata: avoid UAF for reorder_work	2025-02-28 11:00:53 -05:00
panic.c	taint: Add TAINT_FWCTL	2025-06-17 10:30:11 +09:00
params.c	…
pid.c	…
pid_namespace.c	Revert "rcu-tasks: Fix synchronize_rcu_tasks() VS zap_pid_ns_processes()"	2024-08-26 10:57:50 -04:00
pid_sysctl.h	…
profile.c	…
ptrace.c	mm: make __access_remote_vm() static	2024-12-09 12:22:45 -05:00
range.c	…
reboot.c	Flush console log from kernel_power_off()	2025-05-02 11:11:41 -04:00
regset.c	…
relay.c	…
resource.c	resource: fix region_intersects() vs add_memory_driver_managed()	2024-10-29 10:10:23 -06:00
resource_kunit.c	…
rh_messages.c	…
rh_messages.h	message deprecated state in ahci_xgene, ahci_seattle and hisi_sas_main	2025-06-10 15:14:16 +02:00
rh_shadowman.c	…
rseq.c	…
scftorture.c	…
scs.c	…
seccomp.c	…
signal.c	signal: restore the override_rlimit logic	2024-12-20 15:33:02 +00:00
smp.c	smp,csd: Throw an error if a CSD lock is stuck for too long	2025-05-08 14:55:47 -04:00
smpboot.c	kthread: add kthread_stop_put	2024-09-20 12:26:34 -07:00
smpboot.h	…
softirq.c	softirq: Allow raising SCHED_SOFTIRQ from SMP-call-function on RT kernel	2024-12-11 19:37:36 +00:00
stackleak.c	…
stacktrace.c	…
static_call.c	…
static_call_inline.c	x86/static-call: provide a way to do very early static-call updates	2025-02-18 17:58:05 +01:00
stop_machine.c	…
sys.c	Merge: CVE-2024-50271: ucounts: Split rlimit and ucount values and max values	2025-02-03 10:00:41 -05:00
sys_ni.c	x86/shstk: Introduce map_shadow_stack syscall	2024-10-01 11:17:15 -04:00
sysctl-test.c	…
sysctl.c	mm: hugetlb: move hugeltb sysctls to its own file	2024-07-16 09:29:59 -04:00
task_work.c	task_work: Add TWA_NMI_CURRENT as an additional notify mode.	2024-10-14 13:02:40 +02:00
taskstats.c	…
test_kprobes.c	…
torture.c	…
tracepoint.c	…
tsacct.c	…
ucount.c	signal: restore the override_rlimit logic	2024-12-20 15:33:02 +00:00
uid16.c	…
uid16.h	…
umh.c	…
up.c	…
user-return-notifier.c	…
user.c	…
user_namespace.c	Merge: CVE-2024-50271: ucounts: Split rlimit and ucount values and max values	2025-02-03 10:00:41 -05:00
usermode_driver.c	…
utsname.c	…
utsname_sysctl.c	…
vmcore_info.c	crash: split vmcoreinfo exporting code out from crash_core.c	2024-12-23 09:35:35 +08:00
watch_queue.c	watch_queue: fix pipe accounting mismatch	2025-04-02 10:32:41 +02:00
watchdog.c	…
watchdog_hld.c	…
workqueue.c	workqueue: Put the pwq after detaching the rescuer from the pool	2025-02-27 22:46:55 +00:00
workqueue_internal.h	…