kho: always expose output FDT in debugfs

Currently, the output FDT is added to debugfs only when KHO is finalized
and removed when aborted.

There is no need to hide the FDT based on the state.  Always expose it
starting from initialization.  This aids the transition toward removing
the explicit abort functionality and converting KHO to be fully stateless.

Link: https://lkml.kernel.org/r/20251114190002.3311679-7-pasha.tatashin@soleen.com
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>

diff --git a/kernel/liveupdate/kexec_handover.c b/kernel/liveupdate/kexec_handover.c
index bed611b..3e32c61 100644 (file)
--- a/kernel/liveupdate/kexec_handover.c
+++ b/kernel/liveupdate/kexec_handover.c
@@ -1234,8 +1234,6 @@ int kho_abort(void)
        __kho_abort();
        kho_out.finalized = false;
 
-       kho_debugfs_fdt_remove(&kho_out.dbg, kho_out.fdt);
-
        return 0;
 }
 
@@ -1306,9 +1304,6 @@ int kho_finalize(void)
 
        kho_out.finalized = true;
 
-       WARN_ON_ONCE(kho_debugfs_fdt_add(&kho_out.dbg, "fdt",
-                                        kho_out.fdt, true));
-
        return 0;
 }
 
@@ -1425,6 +1420,9 @@ static __init int kho_init(void)
                        init_cma_reserved_pageblock(pfn_to_page(pfn));
        }
 
+       WARN_ON_ONCE(kho_debugfs_fdt_add(&kho_out.dbg, "fdt",
+                                        kho_out.fdt, true));
+
        return 0;
 
 err_free_fdt: