linux-kernel - [PATCH v2 6/7] kexec, kstate: save kstate data before kexec'ing

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Message-ID: <20250310120318.2124-7-arbn@yandex-team.com>
Date: Mon, 10 Mar 2025 13:03:17 +0100
From: Andrey Ryabinin <arbn@...dex-team.com>
To: linux-kernel@...r.kernel.org
Cc: Alexander Graf <graf@...zon.com>,
	James Gowans <jgowans@...zon.com>,
	Mike Rapoport <rppt@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm@...ck.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	x86@...nel.org,
	"H . Peter Anvin" <hpa@...or.com>,
	Eric Biederman <ebiederm@...ssion.com>,
	kexec@...ts.infradead.org,
	Pratyush Yadav <ptyadav@...zon.de>,
	Jason Gunthorpe <jgg@...dia.com>,
	Pasha Tatashin <pasha.tatashin@...een.com>,
	David Rientjes <rientjes@...gle.com>,
	Andrey Ryabinin <arbn@...dex-team.com>
Subject: [PATCH v2 6/7] kexec, kstate: save kstate data before kexec'ing

Call kstate_save_state() to serialize all the required data
into the kstate data stream.

Signed-off-by: Andrey Ryabinin <arbn@...dex-team.com>
---
 kernel/kexec_core.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c
index 5d001b7a9e44..7dcdaee14bfa 100644
--- a/kernel/kexec_core.c
+++ b/kernel/kexec_core.c
@@ -1017,11 +1017,14 @@ int kernel_kexec(void)
 		error = -EINVAL;
 		goto Unlock;
 	}
+	error = kstate_save_state();
+	if (error)
+		goto Unlock;
 
 	if (kexec_late_load(kexec_image)) {
 		error = kexec_file_load_segments(kexec_image);
 		if (error)
-			goto Unlock;
+			goto Free_kstate;
 	}
 
 #ifdef CONFIG_KEXEC_JUMP
@@ -1104,6 +1107,8 @@ int kernel_kexec(void)
 	}
 #endif
 
+ Free_kstate:
+	free_kstate_stream();
  Unlock:
 	kexec_unlock();
 	return error;
-- 
2.45.3