[PATCH v1 8/8] selftests: kho: add read-only KHO test to vmtest.sh

[sashiko-bot at kernel.org]

> Extend tools/testing/selftests/kho/vmtest.sh and init.c to run a second
> QEMU test verifying read-only KHO ('kho_ro=<fdt_phys>') after the
> standard KHO test on both x86_64 and aarch64:
> 
> - Build a second kernel configured with CONFIG_KEXEC_HANDOVER_READONLY=y
>   (and CONFIG_KEXEC_HANDOVER=n).
> - Pass KHO_RO_CMDLINE ('nokaslr kho_bootmem=64M,64M,64M' on x86_64,
>   'cma=116M at 0x40c00000' on aarch64) to the first kernel in the read-only
>   test run so KHO allocations are placed in predictable physical ranges.
> - When booted with 'kho_ro_test', read /debugfs/kho/out/fdt_phys in
>   init.c and kexec into the read-only kernel with 'kho_ro=<fdt_phys>'
>   and architecture-specific memory parameters
>   ('memmap=792M$16M memmap=24M$1000M' on x86_64,
>   'mem=128M cma=12M at 0x40000000' on aarch64) so the preserved pages are
>   excluded from the boot memory map and mapped via kho_ro_map_folio().
> - Verify 'KHO restore succeeded' from test_kho in read-only mode.
> 
> Signed-off-by: Pasha Tatashin <pasha.tatashin at soleen.com>

Sashiko has reviewed this patch and found no issues.

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Sashiko AI review · https://sashiko.dev/#/patchset/20261019021111.990394-1-pasha.tatashin@soleen.com?part=8