linux/include/asm-generic
Jork Loeser 5170a82e89 x86/hyperv: Skip LP/VP creation on kexec
After a kexec the logical processors and virtual processors already
exist in the hypervisor because they were created by the previous
kernel. Attempting to add them again causes either a BUG_ON or
corrupted VP state leading to MCEs in the new kernel.

Add hv_lp_exists() to probe whether an LP is already present by
calling HVCALL_GET_LOGICAL_PROCESSOR_RUN_TIME. When it succeeds the
LP exists and we skip the add-LP and create-VP loops entirely.

Also add hv_call_notify_all_processors_started() which informs the
hypervisor that all processors are online. This is required after
adding LPs (fresh boot) and is a no-op on kexec since we skip that
path.

Co-developed-by: Anirudh Rayabharam <anrayabh@linux.microsoft.com>
Signed-off-by: Anirudh Rayabharam <anrayabh@linux.microsoft.com>
Co-developed-by: Stanislav Kinsburskii <stanislav.kinsburskii@gmail.com>
Signed-off-by: Stanislav Kinsburskii <stanislav.kinsburskii@gmail.com>
Co-developed-by: Mukesh Rathor <mrathor@linux.microsoft.com>
Signed-off-by: Mukesh Rathor <mrathor@linux.microsoft.com>
Signed-off-by: Jork Loeser <jloeser@linux.microsoft.com>
Reviewed-by: Stanislav Kinsburskii <skinsburskii@linux.microsoft.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
2026-04-22 06:23:25 +00:00
..
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
access_ok.h uaccess: remove CONFIG_SET_FS 2022-02-25 09:36:06 +01:00
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 atomic: specify alignment for atomic_t and atomic64_t 2026-01-26 19:07:14 -08:00
audit_change_attr.h audit: add fchmodat2() to change attributes class 2025-12-15 14:27:18 -05:00
audit_dir_write.h
audit_read.h audit: add missing syscalls to read class 2026-01-06 16:42:29 -05:00
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 include: move find.h from asm_generic to linux 2022-01-15 08:47:31 -08:00
bitsperlong.h lib: extend the scope of small_const_nbits() macro 2021-05-06 19:24:11 -07:00
bug.h x86/bug: Implement WARN_ONCE() 2025-11-24 20:23:25 +01:00
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 futex: Fix additional regressions 2021-12-11 23:31:51 +01:00
getorder.h
hardirq.h
hugetlb.h mm: correctly handle UFFD PTE markers 2025-11-24 15:08:50 -08:00
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_regs.h
irq_work.h
irq.h
irqflags.h
Kbuild perf: Use EXPORT_SYMBOL_FOR_KVM() for the mediated APIs 2025-12-19 08:54:59 +01:00
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 logic_io instance of iounmap() needs volatile on argument 2021-12-21 21:31:08 +01:00
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_types.h
mmiowb.h
mmu_context.h
mmu.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 x86/hyperv: Skip LP/VP creation on kexec 2026-04-22 06:23:25 +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_iomap.h PCI: Stub __pci_ioport_map() for arches that don't support it at all 2022-07-29 12:01:00 -05:00
pci.h asm-generic: Add new pci.h and use it 2022-07-22 17:34:57 -05:00
percpu.h asm-generic: percpu: Add assembly guard 2025-10-27 16:41:53 +01:00
pgalloc.h mm: remove unnecessary __GFP_HIGHMEM in __p*d_alloc_one_*() 2025-11-20 13:43:59 -08:00
pgtable_uffd.h mm: userfaultfd: add pgtable_supports_uffd_wp() 2025-11-24 15:08:54 -08:00
pgtable-nop4d.h mm: rename p4d_page_vaddr to p4d_pgtable and make it return pud_t * 2021-07-08 11:48:22 -07:00
pgtable-nopmd.h mm: recover pud_leaf() definitions in nopmd case 2024-03-13 12:12:21 -07:00
pgtable-nopud.h mm: rename p4d_page_vaddr to p4d_pgtable and make it return pud_t * 2021-07-08 11:48:22 -07:00
preempt.h riscv: support PREEMPT_DYNAMIC with static keys 2023-08-31 00:18:34 -07:00
qrwlock_types.h locking/qrwlock: Change "queue rwlock" to "queued rwlock" 2022-05-11 16:27:04 +02:00
qrwlock.h asm-generic changes for 5.19 2022-05-26 10:50:30 -07:00
qspinlock_types.h
qspinlock.h riscv: Add qspinlock support 2024-11-11 07:33:20 -08:00
resource.h
rqspinlock.h mm.git review status for linus..mm-nonmm-stable 2026-02-12 12:13:01 -08:00
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_types.h asm-generic: ticket-lock: Reuse arch_spinlock_t of qspinlock 2024-11-11 07:33:16 -08:00
spinlock.h asm-generic: ticket-lock: Add separate ticket-lock.h 2024-11-11 07:33:17 -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 mm: convert __HAVE_ARCH_TLB_REMOVE_TABLE to CONFIG_HAVE_ARCH_TLB_REMOVE_TABLE config 2026-02-06 15:47:19 -08:00
tlbflush.h
topology.h include/asm-generic/topology.h: Remove unused definition of cpumask_of_node() 2026-01-30 16:44:38 +01:00
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: Split .modinfo out from ELF_DETAILS 2026-02-26 11:50:19 -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 lib/xor: make xor prototypes more friendly to compiler vectorization 2022-02-11 20:39:39 +11:00