linux-kernel - [PATCH v6 03/20] kexec: call liveupdate

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Message-ID: <20251115233409.768044-4-pasha.tatashin@soleen.com>
Date: Sat, 15 Nov 2025 18:33:49 -0500
From: Pasha Tatashin <pasha.tatashin@...een.com>
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Subject: [PATCH v6 03/20] kexec: call liveupdate_reboot() before kexec

Modify the kernel_kexec() to call liveupdate_reboot().

This ensures that the Live Update Orchestrator is notified just
before the kernel executes the kexec jump. The liveupdate_reboot()
function triggers the final freeze event, allowing participating
FDs perform last-minute check or state saving within the blackout
window.

If liveupdate_reboot() returns an error (indicating a failure during
LUO finalization), the kexec operation is aborted to prevent proceeding
with an inconsistent state. An error is returned to user.

Signed-off-by: Pasha Tatashin <pasha.tatashin@...een.com>
---
 kernel/kexec_core.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c
index a8890dd03a1d..3122235c225b 100644
--- a/kernel/kexec_core.c
+++ b/kernel/kexec_core.c
@@ -15,6 +15,7 @@
 #include <linux/kexec.h>
 #include <linux/mutex.h>
 #include <linux/list.h>
+#include <linux/liveupdate.h>
 #include <linux/highmem.h>
 #include <linux/syscalls.h>
 #include <linux/reboot.h>
@@ -1145,6 +1146,10 @@ int kernel_kexec(void)
 		goto Unlock;
 	}
 
+	error = liveupdate_reboot();
+	if (error)
+		goto Unlock;
+
 #ifdef CONFIG_KEXEC_JUMP
 	if (kexec_image->preserve_context) {
 		/*
-- 
2.52.0.rc1.455.g30608eb744-goog