linux-kernel - [RFC PATCH 4/4] x86: Invoke pre

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Date: Tue, 18 Jun 2024 11:41:57 -0400
From: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To: Dan Williams <dan.j.williams@...el.com>,
	Steven Rostedt <rostedt@...dmis.org>
Cc: linux-kernel@...r.kernel.org,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Vishal Verma <vishal.l.verma@...el.com>,
	Dave Jiang <dave.jiang@...el.com>,
	Ira Weiny <ira.weiny@...el.com>,
	nvdimm@...ts.linux.dev,
	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>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: [RFC PATCH 4/4] x86: Invoke pre_restart notifiers

Invoke the pre_restart notifiers after shutdown, before machine restart.
This allows preserving pmem memory across warm reboots.

Invoke the pre_restart notifiers on emergency_machine_restart to cover
the panic() scenario.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Vishal Verma <vishal.l.verma@...el.com>
Cc: Dave Jiang <dave.jiang@...el.com>
Cc: Ira Weiny <ira.weiny@...el.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: nvdimm@...ts.linux.dev
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: x86@...nel.org
Cc: "H. Peter Anvin" <hpa@...or.com>
---
 arch/x86/kernel/reboot.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
index f3130f762784..222619fa63c6 100644
--- a/arch/x86/kernel/reboot.c
+++ b/arch/x86/kernel/reboot.c
@@ -631,8 +631,10 @@ static void native_machine_emergency_restart(void)
 	int orig_reboot_type = reboot_type;
 	unsigned short mode;
 
-	if (reboot_emergency)
+	if (reboot_emergency) {
+		do_kernel_pre_restart(NULL);
 		emergency_reboot_disable_virtualization();
+	}
 
 	tboot_shutdown(TB_SHUTDOWN_REBOOT);
 
@@ -760,12 +762,13 @@ static void __machine_emergency_restart(int emergency)
 	machine_ops.emergency_restart();
 }
 
-static void native_machine_restart(char *__unused)
+static void native_machine_restart(char *cmd)
 {
 	pr_notice("machine restart\n");
 
 	if (!reboot_force)
 		machine_shutdown();
+	do_kernel_pre_restart(cmd);
 	__machine_emergency_restart(0);
 }
 
-- 
2.39.2