linux/arch
Linus Torvalds fbe1bf1e5f Revert "x86/smp: Put CPUs into INIT on shutdown if possible"
This reverts commit 45e34c8af5, and the
two subsequent fixes to it:

  3f874c9b2a ("x86/smp: Don't send INIT to non-present and non-booted CPUs")
  b1472a60a5 ("x86/smp: Don't send INIT to boot CPU")

because it seems to result in hung machines at shutdown.  Particularly
some Dell machines, but Thomas says

 "The rest seems to be Lenovo and Sony with Alderlake/Raptorlake CPUs -
  at least that's what I could figure out from the various bug reports.

  I don't know which CPUs the DELL machines have, so I can't say it's a
  pattern.

  I agree with the revert for now"

Ashok Raj chimes in:

 "There was a report (probably this same one), and it turns out it was a
  bug in the BIOS SMI handler.

  The client BIOS's were waiting for the lowest APICID to be the SMI
  rendevous master. If this is MeteorLake, the BSP wasn't the one with
  the lowest APIC and it triped here.

  The BIOS change is also being pushed to others for assimilation :)

  Server BIOS's had this correctly for a while now"

and it does look likely to be some bad interaction between SMI and the
non-BSP cores having put into INIT (and thus unresponsive until reset).

Link: https://bbs.archlinux.org/viewtopic.php?pid=2124429
Link: https://www.reddit.com/r/openSUSE/comments/16qq99b/tumbleweed_shutdown_did_not_finish_completely/
Link: https://forum.artixlinux.org/index.php/topic,5997.0.html
Link: https://bugzilla.redhat.com/show_bug.cgi?id=2241279
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2023-10-15 12:02:02 -07:00
..
alpha Kbuild updates for v6.6 2023-09-05 11:01:47 -07:00
arc ARC updates for v6.6 2023-09-04 15:38:24 -07:00
arm ARM: SoC fixes for 6.6 2023-09-30 18:41:37 -07:00
arm64 Including fixes from CAN and BPF. 2023-10-12 13:07:00 -07:00
csky arch/csky 2nd patches for 6.6 2023-09-01 08:02:45 -07:00
hexagon Add x86 shadow stack support 2023-08-31 12:20:12 -07:00
ia64 cpu-hotplug: Provide prototypes for arch CPU registration 2023-10-11 14:27:37 +02:00
loongarch LoongArch: Add support for 64_PCREL relocation type 2023-09-27 16:19:13 +08:00
m68k ata changes for 6.6 2023-09-05 12:37:28 -07:00
microblaze Microblaze patches for 6.6-rc1 2023-09-05 10:15:22 -07:00
mips MIPS: Alchemy: only build mmc support helpers if au1xmmc is enabled 2023-09-25 11:43:55 +02:00
nios2 Add x86 shadow stack support 2023-08-31 12:20:12 -07:00
openrisc OpenRISC updates for 6.6 2023-09-05 10:09:31 -07:00
parisc parisc architecture fixes for kernel v6.6-rc5: 2023-10-07 13:05:43 -07:00
powerpc powerpc fixes for 6.6 #4 2023-10-15 08:48:53 -07:00
riscv RISC-V Fixes for 6.6-rc6 2023-10-13 09:17:48 -07:00
s390 s390/bpf: Fix unwinding past the trampoline 2023-10-11 00:08:46 +02:00
sh sh: mm: re-add lost __ref to ioremap_prot() to fix modpost warning 2023-09-19 13:21:32 -07:00
sparc mm: hugetlb: add huge page size param to set_huge_pte_at() 2023-09-29 17:20:47 -07:00
um This pull request contains the following changes for UML: 2023-09-04 11:32:21 -07:00
x86 Revert "x86/smp: Put CPUs into INIT on shutdown if possible" 2023-10-15 12:02:02 -07:00
xtensa xtensa: boot/lib: fix function prototypes 2023-09-20 05:03:30 -07:00
.gitignore
Kconfig Add x86 shadow stack support 2023-08-31 12:20:12 -07:00