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We must check whether KHO is enabled prior to issuing KHO commands,
otherwise KHO internal data structures are not initialized.
Link: https://lkml.kernel.org/r/20251106220635.2608494-1-pasha.tatashin@soleen.com
Fixes: b753522bed0b ("kho: add test for kexec handover")
Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Reported-by: kernel test robot <oliver.sang@intel.com>
Closes: https://lore.kernel.org/oe-lkp/202511061629.e242724-lkp@intel.com
Reviewed-by: Pratyush Yadav <pratyush@kernel.org>
Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Cc: Alexander Graf <graf@amazon.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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KHO test stores physical addresses of the preserved folios directly in
fdt. Use kho_preserve_vmalloc() instead of it and kho_restore_vmalloc()
to retrieve the addresses after kexec.
This makes the test more scalable from one side and adds tests coverage
for kho_preserve_vmalloc() from the other.
Link: https://lkml.kernel.org/r/20250921054458.4043761-5-rppt@kernel.org
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Reviewed-by: Pratyush Yadav <pratyush@kernel.org>
Cc: Alexander Graf <graf@amazon.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Changyuan Lyu <changyuanl@google.com>
Cc: Chris Li <chrisl@kernel.org>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Pasha Tatashin <pasha.tatashin@soleen.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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* Update kho_test_save() so that folios array won't be freed when
returning from the function and the fdt will be freed on error
* Reset state->nr_folios to 0 in kho_test_generate_data() on error
* Simplify allocation of folios info in fdt.
Link: https://lkml.kernel.org/r/20250811082510.4154080-3-rppt@kernel.org
Fixes: b753522bed0b ("kho: add test for kexec handover")
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Reported-by: Pratyush Yadav <pratyush@kernel.org>
Closes: https://lore.kernel.org/all/mafs0zfcjcepf.fsf@kernel.org
Reviewed-by: Pratyush Yadav <pratyush@kernel.org>
Cc: Alexander Graf <graf@amazon.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Changyuan Lyu <changyuanl@google.com>
Cc: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Thomas Weißschuh <linux@weissschuh.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Testing kexec handover requires a kernel driver that will generate some
data and preserve it with KHO on the first boot and then restore that data
and verify it was preserved properly after kexec.
To facilitate such test, along with the kernel driver responsible for data
generation, preservation and restoration add a script that runs a kernel
in a VM with a minimal /init. The /init enables KHO, loads a kernel image
for kexec and runs kexec reboot. After the boot of the kexeced kernel,
the driver verifies that the data was properly preserved.
[rppt@kernel.org: fix section mismatch]
Link: https://lkml.kernel.org/r/aIiRC8fXiOXKbPM_@kernel.org
Link: https://lkml.kernel.org/r/20250727083733.2590139-1-rppt@kernel.org
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Cc: Alexander Graf <graf@amazon.com>
Cc: Changyuan Lyu <changyuanl@google.com>
Cc: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: Pratyush Yadav <pratyush@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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