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mirror_ubuntu-kernels/arch/x86/realmode/rm
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Thomas Gleixner 33e20b07be x86/realmode: Make stack lock work in trampoline_compat() 
The stack locking and stack assignment macro LOAD_REALMODE_ESP fails to
work when invoked from the 64bit trampoline entry point:

trampoline_start64
  trampoline_compat
    LOAD_REALMODE_ESP <- lock

Accessing tr_lock is only possible from 16bit mode. For the compat entry
point this needs to be pa_tr_lock so that the required relocation entry is
generated. Otherwise it locks the non-relocated address which is
aside of being wrong never cleared in secondary_startup_64() causing all
but the first CPU to get stuck on the lock.

Make the macro take an argument lock_pa which defaults to 0 and rename it
to LOCK_AND_LOAD_REALMODE_ESP to make it clear what this is about.

Fixes: f6f1ae9128 ("x86/smpboot: Implement a bit spinlock to protect the realmode stack")
Reported-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Link: https://lore.kernel.org/r/87h6rujdvl.ffs@tglx
2023-05-30 14:11:47 +02:00
..
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
bioscall.S x86, realmode: flattened rm hierachy 2012-05-08 11:48:45 -07:00
copy.S x86, realmode: flattened rm hierachy 2012-05-08 11:48:45 -07:00
header.S x86/boot: Add a trampoline for booting APs via firmware handoff 2022-04-07 08:27:52 -07:00
Makefile x86: kmsan: disable instrumentation of unsupported code 2022-10-03 14:03:24 -07:00
realmode.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
realmode.lds.S x86/vmlinux: Drop unneeded linker script discard of .eh_frame 2020-02-25 14:51:29 +01:00
reboot.S x86/asm/64: Add ENDs to some functions and relabel with SYM_CODE_* 2019-10-18 11:58:16 +02:00
regs.c x86, realmode: flattened rm hierachy 2012-05-08 11:48:45 -07:00
stack.S x86/asm/realmode: Use SYM_DATA_* instead of GLOBAL 2019-10-18 11:28:47 +02:00
trampoline_32.S x86/asm/32: Add ENDs to some functions and relabel with SYM_CODE_* 2019-10-18 11:58:33 +02:00
trampoline_64.S x86/realmode: Make stack lock work in trampoline_compat() 2023-05-30 14:11:47 +02:00
trampoline_common.S x86/boot: Add a trampoline for booting APs via firmware handoff 2022-04-07 08:27:52 -07:00
video-bios.c x86, realmode: flattened rm hierachy 2012-05-08 11:48:45 -07:00
video-mode.c x86, realmode: flattened rm hierachy 2012-05-08 11:48:45 -07:00
video-vesa.c x86, realmode: flattened rm hierachy 2012-05-08 11:48:45 -07:00
video-vga.c x86, realmode: flattened rm hierachy 2012-05-08 11:48:45 -07:00
wakemain.c x86/boot: Port I/O: Allow to hook up alternative helpers 2022-04-07 08:27:52 -07:00
wakeup_asm.S x86/asm/64: Add ENDs to some functions and relabel with SYM_CODE_* 2019-10-18 11:58:16 +02:00
wakeup.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00