linux-kernel - [PATCH 1/1] xen/manage: enable C_A

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Date:   Wed, 13 May 2020 16:34:10 -0700
From:   Dongli Zhang <dongli.zhang@...cle.com>
To:     xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Cc:     boris.ostrovsky@...cle.com, jgross@...e.com,
        sstabellini@...nel.org, joe.jin@...cle.com, rose.wang@...cle.com
Subject: [PATCH 1/1] xen/manage: enable C_A_D to force reboot

The systemd may be configured to mask ctrl-alt-del via "systemctl mask
ctrl-alt-del.target". As a result, the pv reboot would not work as signal
is ignored.

This patch always enables C_A_D before the call of ctrl_alt_del() in order
to force the reboot.

Reported-by: Rose Wang <rose.wang@...cle.com>
Cc: Joe Jin <joe.jin@...cle.com>
Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
Signed-off-by: Dongli Zhang <dongli.zhang@...cle.com>
---
 drivers/xen/manage.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/xen/manage.c b/drivers/xen/manage.c
index cd046684e0d1..3190d0ecb52e 100644
--- a/drivers/xen/manage.c
+++ b/drivers/xen/manage.c
@@ -204,6 +204,13 @@ static void do_poweroff(void)
 static void do_reboot(void)
 {
 	shutting_down = SHUTDOWN_POWEROFF; /* ? */
+	/*
+	 * The systemd may be configured to mask ctrl-alt-del via
+	 * "systemctl mask ctrl-alt-del.target". As a result, the pv reboot
+	 * would not work. To enable C_A_D would force the reboot.
+	 */
+	C_A_D = 1;
+
 	ctrl_alt_del();
 }
 
-- 
2.17.1