diff options
| author | Pasha Tatashin <pasha.tatashin@soleen.com> | 2025-08-08 20:18:03 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-08-28 16:34:34 +0200 |
| commit | 4039ab9bdc72147d6a26d5fb32609df8fe8826f2 (patch) | |
| tree | fa095965daaa4b824e1a5f167dfb0c14473d14b3 | |
| parent | 9a140705f1a0b9e09d46a4fef6fda33a933917d8 (diff) | |
kho: mm: don't allow deferred struct page with KHO
commit 8b66ed2c3f42cc462e05704af6b94e6a7bad2f5e upstream.
KHO uses struct pages for the preserved memory early in boot, however,
with deferred struct page initialization, only a small portion of memory
has properly initialized struct pages.
This problem was detected where vmemmap is poisoned, and illegal flag
combinations are detected.
Don't allow them to be enabled together, and later we will have to teach
KHO to work properly with deferred struct page init kernel feature.
Link: https://lkml.kernel.org/r/20250808201804.772010-3-pasha.tatashin@soleen.com
Fixes: 4e1d010e3bda ("kexec: add config option for KHO")
Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Acked-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: Changyuan Lyu <changyuanl@google.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>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | kernel/Kconfig.kexec | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/Kconfig.kexec b/kernel/Kconfig.kexec index 2ee603a98813..1224dd937df0 100644 --- a/kernel/Kconfig.kexec +++ b/kernel/Kconfig.kexec @@ -97,6 +97,7 @@ config KEXEC_JUMP config KEXEC_HANDOVER bool "kexec handover" depends on ARCH_SUPPORTS_KEXEC_HANDOVER && ARCH_SUPPORTS_KEXEC_FILE + depends on !DEFERRED_STRUCT_PAGE_INIT select MEMBLOCK_KHO_SCRATCH select KEXEC_FILE select DEBUG_FS |