6.16-stable review patch. If anyone has any objections, please let me know.
------------------
From: Pasha Tatashin pasha.tatashin@soleen.com
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 --- kernel/Kconfig.kexec | 1 + 1 file changed, 1 insertion(+)
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