Merge tag 'loongarch-6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson

Pull LoongArch updates from Huacai Chen:

- Initialize acpi_gbl_use_global_lock to false

- Al

Merge tag 'loongarch-6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson

Pull LoongArch updates from Huacai Chen:

- Initialize acpi_gbl_use_global_lock to false

- Allow specify SIMD width via kernel parameters

- Add kexec_file (both EFI & ELF format) support

- Add PER_VMA_LOCK for page fault handling support

- Improve BPF trampoline support

- Update the default config file

- Some bug fixes and other small changes

* tag 'loongarch-6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson: (23 commits)
LoongArch: Update Loongson-3 default config file
LoongArch: BPF: Sign-extend struct ops return values properly
LoongArch: BPF: Make error handling robust in arch_prepare_bpf_trampoline()
LoongArch: BPF: Make trampoline size stable
LoongArch: BPF: Don't align trampoline size
LoongArch: BPF: No support of struct argument in trampoline programs
LoongArch: BPF: No text_poke() for kernel text
LoongArch: BPF: Remove duplicated bpf_flush_icache()
LoongArch: BPF: Remove duplicated flags check
LoongArch: BPF: Fix uninitialized symbol 'retval_off'
LoongArch: BPF: Optimize sign-extention mov instructions
LoongArch: Handle new atomic instructions for probes
LoongArch: Try VMA lock-based page fault handling first
LoongArch: Automatically disable kaslr if boot from kexec_file
LoongArch: Add crash dump support for kexec_file
LoongArch: Add ELF binary support for kexec_file
LoongArch: Add EFI binary support for kexec_file
LoongArch: Add preparatory infrastructure for kexec_file
LoongArch: Add struct loongarch_image_header for kernel
LoongArch: Allow specify SIMD width via kernel parameters
...

show more ...

LoongArch: Add crash dump support for kexec_file

Enabling crash dump (kdump) includes:
- Prepare contents of ELF header of a core dump file, /proc/vmcore,
using crash_prepare_elf64_headers().
- Ad

LoongArch: Add crash dump support for kexec_file

Enabling crash dump (kdump) includes:
- Prepare contents of ELF header of a core dump file, /proc/vmcore,
using crash_prepare_elf64_headers().
- Add "mem=size@start" parameter to the command line and pass it to the
capture kernel. Limit the runtime memory area of the captured kernel
to avoid disrupting the production kernel's runtime state.
- Add "elfcorehdr=size@start" parameter to the cmdline.

The basic usage for kdump (add the cmdline parameter crashkernel=512M
to grub.cfg for production kernel):

1) Load capture kernel image (vmlinux.efi or vmlinux can both be used):
# kexec -s -p vmlinuz.efi --initrd=initrd.img --reuse-cmdline

2) Do something to crash, like:
# echo c > /proc/sysrq-trigger

Signed-off-by: Youling Tang <tangyouling@kylinos.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

show more ...

LoongArch: Add ELF binary support for kexec_file

This patch creates kexec_elf_ops to load ELF binary file for
kexec_file_load() syscall.

However, for `kbuf->memsz` and `kbuf->buf_min`, special hand

LoongArch: Add ELF binary support for kexec_file

This patch creates kexec_elf_ops to load ELF binary file for
kexec_file_load() syscall.

However, for `kbuf->memsz` and `kbuf->buf_min`, special handling is
required, and the generic `kexec_elf_load()` cannot be used directly.

$ readelf -l vmlinux
...
Type Offset VirtAddr PhysAddr
FileSiz MemSiz Flags Align
LOAD 0x0000000000010000 0x9000000000200000 0x9000000000200000
0x0000000002747a00 0x000000000287a0d8 RWE 0x10000
NOTE 0x0000000000000000 0x0000000000000000 0x0000000000000000
0x0000000000000000 0x0000000000000000 R 0x8

phdr->p_paddr should have been a physical address, but it is a virtual
address on the current LoongArch. This will cause kexec_file to fail
when loading the kernel and need to be converted to a physical address.

From the above MemSiz, it can be seen that 0x287a0d8 isn't page aligned.
Although kexec_add_buffer() will perform PAGE_SIZE alignment on kbuf->
memsz, there is still a stampeding in the loaded kernel space and initrd
space. The initrd resolution failed when starting the second kernel.

It can be known from the link script vmlinux.lds.S that,
BSS_SECTION(0, SZ_64K, 8)
. = ALIGN(PECOFF_SEGMENT_ALIGN);

It needs to be aligned according to SZ_64K, so that after alignment, its
size is consistent with _kernel_asize.

The basic usage (vmlinux):

1) Load second kernel image:
# kexec -s -l vmlinux --initrd=initrd.img --reuse-cmdline

2) Startup second kernel:
# kexec -e

Signed-off-by: Youling Tang <tangyouling@kylinos.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

show more ...

LoongArch: Add EFI binary support for kexec_file

This patch creates kexec_efi_ops to load EFI binary file for
kexec_file_load() syscall.

The efi_kexec_load() as two parts:
- the first part loads th

LoongArch: Add EFI binary support for kexec_file

This patch creates kexec_efi_ops to load EFI binary file for
kexec_file_load() syscall.

The efi_kexec_load() as two parts:
- the first part loads the kernel image (vmlinuz.efi or vmlinux.efi)
- the second part loads other segments (e.g: initrd, cmdline, etc)

Currently, pez (vmlinuz.efi) and pei (vmlinux.efi) format images are
supported.

The basic usage (vmlinuz.efi or vmlinux.efi):

1) Load second kernel image:
# kexec -s -l vmlinuz.efi --initrd=initrd.img --reuse-cmdline

2) Startup second kernel:
# kexec -e

Signed-off-by: Youling Tang <tangyouling@kylinos.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

show more ...

LoongArch: Add preparatory infrastructure for kexec_file

Add some preparatory infrastructure:
- Add command line processing.
- Add support for loading other segments.
- Other minor modifications.

T

LoongArch: Add preparatory infrastructure for kexec_file

Add some preparatory infrastructure:
- Add command line processing.
- Add support for loading other segments.
- Other minor modifications.

This initrd will be passed to the second kernel via the command line
'initrd=start,size'.

The 'kexec_file' command line parameter indicates that the kernel is
loaded via kexec_file.

Signed-off-by: Youling Tang <tangyouling@kylinos.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

show more ...