Re: [Xen-devel] Re: [PATCH] xen: register timer interrupt with IRQF_TIMER

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Tue, 2009-11-24 at 12:51 +0000, Valtteri Kiviniemi wrote:
> Hi,
> 
> This is not still working, when I try to save a domain:
> 
> file:
> 
> root@xen:/# du -h db.save
> 64K     db.save
> 
> domU console.
> 
> Ignoring shutdown request: suspend

As I said before - enable CONFIG_PM_SLEEP, you won't get anywhere
without it.

Ian.

> 
> xend.log:
> 
> [2009-11-24 14:47:57 2131] DEBUG (XendCheckpoint:124) [xc_save]: 
> /usr/lib/xen/bin/xc_save 54 1 0 0 0
> [2009-11-24 14:47:57 2131] INFO (XendCheckpoint:424) xc_save: failed to 
> get the suspend evtchn port
> 
> domU config:
> 
> kernel = "/boot/bzImage-domU"
> builder = "linux"
> memory = "1024"
> name = "db"
> vcpus = "8"
> cpus = [ "0", "1", "2", "3", "4", "5", "6", "7" ]
> tsc_native="1"
> vif = [ "mac=00:50:56:13:27:d9, bridge=eth0" ]
> disk = [ "phy:/dev/virtuals/db,xvda1,w" ]
> root = "/dev/xvda1 ro"
> extra = "console=hvc0"
> on_poweroff = "destroy"
> on_reboot = "restart"
> on_crash = "restart"
> 
> Latest xen-unstable (compiled 1 hour ago) latest 2.6.31.6 kernel with 
> this patch applied.
> 
> - Valtteri Kiviniemi
> 
> Ian Campbell kirjoitti:
> > On Tue, 2009-11-24 at 10:16 +0000, Ian Campbell wrote:
> >> Otherwise the timer is disabled by dpm_suspend_noirq() which in turn 
> >> prevents
> >> correct operation of stop_machine on multi-processor systems and breaks
> >> suspend.
> > 
> > This appears to have been broken since after 2.6.29 sometime (I see
> > failures with 2.6.30). I suspect this commit, or one related to it, made
> > IRQF_TIMER a hard requirement:
> > 
> >         commit 0a0c5168df270a50e3518e4f12bddb31f8f5f38f
> >         Author: Rafael J. Wysocki <rjw@xxxxxxx>
> >         Date:   Mon Mar 16 22:33:49 2009 +0100
> >         
> >             PM: Introduce functions for suspending and resuming device 
> > interrupts
> >             
> >             Introduce helper functions allowing us to prevent device 
> > drivers from
> >             getting any interrupts (without disabling interrupts on the CPU)
> >             during suspend (or hibernation) and to make them start to 
> > receive
> >             interrupts again during the subsequent resume.  These functions 
> > make it
> >             possible to keep timer interrupts enabled while the "late" 
> > suspend and
> >             "early" resume callbacks provided by device drivers are being
> >             executed.  In turn, this allows device drivers' "late" suspend 
> > and
> >             "early" resume callbacks to sleep, execute ACPI callbacks etc.
> >             
> >             The functions introduced here will be used to rework the 
> > handling of
> >             interrupts during suspend (hibernation) and resume.  Namely,
> >             interrupts will only be disabled on the CPU right before 
> > suspending
> >             sysdevs, while device drivers will be prevented from receiving
> >             interrupts, with the help of the new helper function, before 
> > their
> >             "late" suspend callbacks run (and analogously during resume).
> > 
> > Ian.
> > 
> > 
> > 
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-devel



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