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Previously, KHO required a dedicated kho_abort() function to clean up
state before kho_finalize() could be called again. This was necessary to
handle complex unwind paths when using notifiers.
With the shift to direct memory preservation, the explicit abort step is
no longer strictly necessary.
Remove kho_abort() and refactor kho_finalize() to handle re-entry. If
kho_finalize() is called while KHO is already finalized, it will now
automatically clean up the previous memory map and state before generating
a new one. This allows the KHO state to be updated/refreshed simply by
triggering finalize again.
Update debugfs to return -EINVAL if userspace attempts to write 0 to the
finalize attribute, as explicit abort is no longer supported.
Link: https://lkml.kernel.org/r/20251114190002.3311679-10-pasha.tatashin@soleen.com
Suggested-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Reviewed-by: Pratyush Yadav <pratyush@kernel.org>
Cc: Alexander Graf <graf@amazon.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Baoquan He <bhe@redhat.com>
Cc: Coiby Xu <coxu@redhat.com>
Cc: Dave Vasilevsky <dave@vasilevsky.ca>
Cc: Eric Biggers <ebiggers@google.com>
Cc: Kees Cook <kees@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Make pr_xxx() call to use the %pe format specifier instead of %d. The %pe
specifier prints a symbolic error string (e.g., -ENOMEM, -EINVAL) when
given an error pointer created with ERR_PTR(err).
This change enhances the clarity and diagnostic value of the error message
by showing a descriptive error name rather than a numeric error code.
Note, that some err are still printed by value, as those errors might come
from libfdt and not regular errnos.
Link: https://lkml.kernel.org/r/20251101142325.1326536-10-pasha.tatashin@soleen.com
Signed-off-by: Zhu Yanjun <yanjun.zhu@linux.dev>
Co-developed-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Reviewed-by: Pratyush Yadav <pratyush@kernel.org>
Cc: Alexander Graf <graf@amazon.com>
Cc: Changyuan Lyu <changyuanl@google.com>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Miguel Ojeda <ojeda@kernel.org>
Cc: "Mike Rapoport (Microsoft)" <rppt@kernel.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Move KHO to kernel/liveupdate/ in preparation of placing all Live Update
core kernel related files to the same place.
[pasha.tatashin@soleen.com: disable the menu when DEFERRED_STRUCT_PAGE_INIT]
Link: https://lkml.kernel.org/r/CA+CK2bAvh9Oa2SLfsbJ8zztpEjrgr_hr-uGgF1coy8yoibT39A@mail.gmail.com
Link: https://lkml.kernel.org/r/20251101142325.1326536-8-pasha.tatashin@soleen.com
Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Cc: Alexander Graf <graf@amazon.com>
Cc: Changyuan Lyu <changyuanl@google.com>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Miguel Ojeda <ojeda@kernel.org>
Cc: Pratyush Yadav <pratyush@kernel.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Simon Horman <horms@kernel.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Zhu Yanjun <yanjun.zhu@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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