linux-kernel - Re: [Xen-devel] [PATCH 2/6] ARM: xen: Register with kernel restart handler

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <20160408182011.GA7083@roeck-us.net>
Date:	Fri, 8 Apr 2016 11:20:11 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:	Russell King <linux@....linux.org.uk>,
	Catalin Marinas <catalin.marinas@....com>,
	Stefano Stabellini <sstabellini@...nel.org>,
	Wolfram Sang <wsa@...-dreams.de>, linux-kernel@...r.kernel.org,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	linux-arm-kernel@...ts.infradead.org,
	xen-devel@...ts.xenproject.org
Subject: Re: [Xen-devel] [PATCH 2/6] ARM: xen: Register with kernel restart
 handler

On Fri, Apr 08, 2016 at 11:22:57AM -0400, Konrad Rzeszutek Wilk wrote:
> On Fri, Apr 08, 2016 at 05:53:55AM -0700, Guenter Roeck wrote:
> > Register with kernel restart handler instead of setting arm_pm_restart
> > directly.
> > 
> > Select a high priority of 192 to ensure that default restart handlers
> 
> Is there some macro for that magic value?
> 
No, only guidelines in kernel/reboot.c.

Guenter

> > are replaced if Xen is running.
> > 
> > Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> > ---
> >  arch/arm/xen/enlighten.c | 13 +++++++++++--
> >  1 file changed, 11 insertions(+), 2 deletions(-)
> > 
> > diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
> > index 75cd7345c654..76a1d12fd27e 100644
> > --- a/arch/arm/xen/enlighten.c
> > +++ b/arch/arm/xen/enlighten.c
> > @@ -27,6 +27,7 @@
> >  #include <linux/cpu.h>
> >  #include <linux/console.h>
> >  #include <linux/pvclock_gtod.h>
> > +#include <linux/reboot.h>
> >  #include <linux/time64.h>
> >  #include <linux/timekeeping.h>
> >  #include <linux/timekeeper_internal.h>
> > @@ -193,14 +194,22 @@ after_register_vcpu_info:
> >  	put_cpu();
> >  }
> >  
> > -static void xen_restart(enum reboot_mode reboot_mode, const char *cmd)
> > +static int xen_restart(struct notifier_block *nb, unsigned long action,
> > +		       void *data)
> >  {
> >  	struct sched_shutdown r = { .reason = SHUTDOWN_reboot };
> >  	int rc;
> >  	rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
> >  	BUG_ON(rc);
> > +
> > +	return NOTIFY_DONE;
> >  }
> >  
> > +static struct notifier_block xen_restart_nb = {
> > +	.notifier_call = xen_restart,
> > +	.priority = 192,
> > +};
> > +
> >  static void xen_power_off(void)
> >  {
> >  	struct sched_shutdown r = { .reason = SHUTDOWN_poweroff };
> > @@ -370,7 +379,7 @@ static int __init xen_pm_init(void)
> >  		return -ENODEV;
> >  
> >  	pm_power_off = xen_power_off;
> > -	arm_pm_restart = xen_restart;
> > +	register_restart_handler(&xen_restart_nb);
> >  	if (!xen_initial_domain()) {
> >  		struct timespec64 ts;
> >  		xen_read_wallclock(&ts);
> > -- 
> > 2.5.0
> > 
> > 
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@...ts.xen.org
> > http://lists.xen.org/xen-devel