Thomas Gleixner 32034df66b rseq: Switch to TIF_RSEQ if supported ... TIF_NOTIFY_RESUME is a multiplexing TIF bit, which is suboptimal especially with the RSEQ fast path depending on it, but not really handling it. Define a separate TIF_RSEQ in the generic TIF space and enable the full separation of fast and slow path for architectures which utilize that. That avoids the hassle with invocations of resume_user_mode_work() from hypervisors, which clear TIF_NOTIFY_RESUME. It makes the therefore required re-evaluation at the end of vcpu_run() a NOOP on architectures which utilize the generic TIF space and have a separate TIF_RSEQ. The hypervisor TIF handling does not include the separate TIF_RSEQ as there is no point in doing so. The guest does neither know nor care about the VMM host applications RSEQ state. That state is only relevant when the ioctl() returns to user space. The fastpath implementation still utilizes TIF_NOTIFY_RESUME for failure handling, but this only happens within exit_to_user_mode_loop(), so arguably the hypervisor ioctl() code is long done when this happens. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Link: https://patch.msgid.link/20251027084307.903622031@linutronix.de		2025-11-04 08:35:37 +01:00
..
bitops	bitops: Add __attribute_const__ to generic ffs()-family implementations	2025-09-08 14:58:50 -07:00
vdso	vdso: Drop Kconfig GENERIC_VDSO_DATA_STORE	2025-09-04 11:23:50 +02:00
Kbuild	unwind_user: Add user space unwinding API with frame pointer support	2025-07-29 14:46:07 -04:00
access_ok.h	…
agp.h	char/agp: introduce asm-generic/agp.h	2023-02-13 22:13:29 +01:00
archrandom.h	random: handle archrandom with multiple longs	2022-07-25 13:26:14 +02:00
asm-offsets.h	…
asm-prototypes.h	…
atomic.h	locking/atomic: make atomic*_{cmp,}xchg optional	2023-06-05 09:57:14 +02:00
atomic64.h	…
audit_change_attr.h	fs/xattr: add *at family syscalls	2024-11-06 12:59:44 -05:00
audit_dir_write.h	…
audit_read.h	…
audit_signal.h	…
audit_write.h	…
barrier.h	sched: Add missing memory barrier in switch_mm_cid	2024-04-16 13:59:45 +02:00
bitops.h	…
bitsperlong.h	…
bug.h	bug: Improve comment	2024-05-07 14:20:48 +02:00
cache.h	…
cacheflush.h	mm: Introduce flush_cache_vmap_early()	2023-12-14 00:23:17 -08:00
cfi.h	cfi: Flip headers	2023-12-15 16:25:55 -08:00
checksum.h	asm-generic: Improve csum_fold	2024-01-17 17:52:29 -08:00
cmpxchg-local.h	asm-generic: Fix 32 bit __generic_cmpxchg_local	2024-01-05 23:19:14 +01:00
cmpxchg.h	asm-generic: avoid __generic_cmpxchg_local warnings	2023-04-04 17:58:11 +02:00
codetag.lds.h	codetag: avoid unused alloc_tags sections/symbols	2025-07-09 22:42:14 -07:00
compat.h	asm-generic: compat: fix compat_arg_u64() and compat_arg_u64_dual()	2022-11-01 10:20:11 +11:00
current.h	asm-generic: current: Don't include thread-info.h if building asm	2023-08-26 22:38:49 +02:00
delay.h	delay: Fix ndelay() spuriously treated as udelay()	2024-11-29 11:40:22 +01:00
device.h	…
div64.h	__arch_xprod64(): make __always_inline when optimizing for performance	2024-10-28 21:44:28 +00:00
dma-mapping.h	dma-mapping: no need to pass a bus_type into get_arch_dma_ops()	2023-02-15 12:35:20 +01:00
dma.h	…
early_ioremap.h	mm/early_ioremap: add null pointer checks to prevent NULL-pointer dereference	2025-01-13 22:40:59 -08:00
emergency-restart.h	…
error-injection.h	docs: fault-injection: add requirements of error injectable functions	2023-02-02 22:50:00 -08:00
exec.h	…
extable.h	…
fixmap.h	fixmap: Remove unused set_fixmap_offset_io()	2024-07-11 17:41:23 +02:00
flat.h	…
fprobe.h	fprobe: Add fprobe_header encoding feature	2024-12-26 10:50:05 -05:00
ftrace.h	…
futex.h	…
getorder.h	…
hardirq.h	…
hugetlb.h	mm: drop hugetlb_free_pgd_range()	2025-07-24 19:12:32 -07:00
hw_irq.h	…
int-ll64.h	…
io.h	asm-generic/io.h: Skip trace helpers if rwmmio events are disabled	2025-09-24 16:21:13 +02:00
ioctl.h	…
iomap.h	asm-generic/io.h: rework split ioread64/iowrite64 helpers	2025-03-01 21:00:22 +01:00
irq.h	…
irq_regs.h	…
irq_work.h	…
irqflags.h	…
kdebug.h	…
kmap_size.h	…
kprobes.h	…
kvm_para.h	…
kvm_types.h	…
linkage.h	…
local.h	locking/generic: Wire up local{,64}_try_cmpxchg()	2023-04-29 09:09:09 +02:00
local64.h	locking/generic: Wire up local{,64}_try_cmpxchg()	2023-04-29 09:09:09 +02:00
logic_io.h	…
mcs_spinlock.h	locking: Move MCS struct definition to public header	2025-03-18 10:28:21 -07:00
memory_model.h	mm: convert page_to_section() to memdesc_section()	2025-09-13 16:55:07 -07:00
mm_hooks.h	mm: remove arch_unmap()	2024-09-01 20:26:13 -07:00
mmiowb.h	…
mmiowb_types.h	…
mmu.h	…
mmu_context.h	…
mmzone.h	arch, mm: move definition of node_data to generic code	2024-09-03 21:15:28 -07:00
module.h	asm-generic: Always define Elf_Rel and Elf_Rela	2025-03-26 15:56:43 -07:00
module.lds.h	…
mshyperv.h	Drivers: hv: Add CONFIG_HYPERV_VMBUS option	2025-10-01 00:00:42 +00:00
msi.h	irqchip/gic-v5: Add GICv5 IWB support	2025-07-08 18:35:52 +01:00
nommu_context.h	…
numa.h	arch_numa: switch over to numa_memblks	2024-09-03 21:15:32 -07:00
param.h	alpha: regularize the situation with asm/param.h	2025-06-24 22:02:05 -04:00
parport.h	…
pci.h	asm-generic: Add new pci.h and use it	2022-07-22 17:34:57 -05:00
pci_iomap.h	PCI: Stub __pci_ioport_map() for arches that don't support it at all	2022-07-29 12:01:00 -05:00
percpu.h	percpu: repurpose __percpu tag as a named address space qualifier	2025-03-16 22:05:53 -07:00
pgalloc.h	mm: call ctor/dtor for kernel PTEs	2025-05-11 17:48:21 -07:00
pgtable-nop4d.h	…
pgtable-nopmd.h	mm: recover pud_leaf() definitions in nopmd case	2024-03-13 12:12:21 -07:00
pgtable-nopud.h	…
pgtable_uffd.h	…
preempt.h	riscv: support PREEMPT_DYNAMIC with static keys	2023-08-31 00:18:34 -07:00
qrwlock.h	asm-generic changes for 5.19	2022-05-26 10:50:30 -07:00
qrwlock_types.h	…
qspinlock.h	riscv: Add qspinlock support	2024-11-11 07:33:20 -08:00
qspinlock_types.h	…
resource.h	…
rqspinlock.h	bpf: Introduce rqspinlock kfuncs	2025-03-19 08:03:06 -07:00
runtime-const.h	runtime constants: add default dummy infrastructure	2024-06-19 12:34:34 -07:00
rwonce.h	rwonce: fix crash by removing READ_ONCE() for unaligned read	2025-03-26 22:16:50 +01:00
seccomp.h	…
sections.h	percpu: Remove __per_cpu_load	2025-02-18 10:16:00 +01:00
serial.h	…
set_memory.h	…
shmparam.h	…
signal.h	asm-generic: Remove empty #ifdef SA_RESTORER	2022-09-10 09:56:53 +02:00
simd.h	asm-generic: Add sched.h inclusion in simd.h	2025-05-30 20:56:48 +08:00
softirq_stack.h	asm-generic: Conditionally enable do_softirq_own_stack() via Kconfig.	2022-09-05 17:20:55 +02:00
spinlock.h	asm-generic: ticket-lock: Add separate ticket-lock.h	2024-11-11 07:33:17 -08:00
spinlock_types.h	asm-generic: ticket-lock: Reuse arch_spinlock_t of qspinlock	2024-11-11 07:33:16 -08:00
statfs.h	…
string.h	…
switch_to.h	…
syscall.h	syscall.h: introduce syscall_set_nr()	2025-05-11 17:48:15 -07:00
syscalls.h	syscalls: mmap(): use unsigned offset type consistently	2024-06-25 15:57:38 +02:00
text-patching.h	asm-generic: introduce text-patching.h	2024-11-07 14:25:15 -08:00
thread_info_tif.h	rseq: Switch to TIF_RSEQ if supported	2025-11-04 08:35:37 +01:00
ticket_spinlock.h	riscv: Add qspinlock support	2024-11-11 07:33:20 -08:00
timex.h	…
tlb.h	mmu_gather: move tlb flush for VM_PFNMAP/VM_MIXEDMAP vmas into free_pgtables()	2025-05-31 22:46:12 -07:00
tlbflush.h	…
topology.h	…
trace_clock.h	…
uaccess.h	move asm/unaligned.h to linux/unaligned.h	2024-10-02 17:23:23 -04:00
unwind_user.h	unwind_user: Add user space unwinding API with frame pointer support	2025-07-29 14:46:07 -04:00
user.h	…
vermagic.h	…
vga.h	empty include/asm-generic/vga.h	2024-11-11 21:51:42 +01:00
video.h	arch: Rename fbdev header and source files	2024-05-03 17:07:50 +02:00
vmlinux.lds.h	kbuild: align modinfo section for Secureboot Authenticode EDK2 compat	2025-10-27 16:21:24 -07:00
word-at-a-time.h	kernel.h: removed REPEAT_BYTE from kernel.h	2024-02-01 09:47:59 -08:00
xor.h	…