Re: [PATCH 2/2] xen/manage: Poweroff forcefully if user-space is not yet up.
From: Konrad Rzeszutek Wilk
Date: Mon Apr 07 2014 - 13:26:44 EST
On Mon, Apr 07, 2014 at 06:19:32PM +0100, David Vrabel wrote:
> On 04/04/14 19:53, Konrad Rzeszutek Wilk wrote:
> > The user can launch the guest in this sequence:
> > xl create -p /vm.cfg [launch, but pause it]
> > xl shutdown latest [sets control/shutdown=poweroff]
> > xl unpause latest
> > xl console latest [and see that the guest has completely
> > ignored the shutdown request]
> > In reality the guest hasn't ignored it. It registers a watch
> > and gets a notification that there is value. It then calls
> > the shutdown_handler which ends up calling orderly_shutdown.
> > Unfortunately that is so early in the bootup that there
> > are no user-space. Which means that the orderly_shutdown fails.
> > But since the force flag was set to false it continues on without
> > reporting.
> > What we really want to is to use the force when we are in the
> > SYSTEM_BOOTING state and not use the 'force' when SYSTEM_RUNNING.
> > However, if we are in the running state - and the shutdown command
> > has been given before the user-space has been setup, there is nothing
> > we can do. Worst yet, we stop ignoring the 'xl shutdown' requests!
> > As such, the other part of this patch is to only stop ignoring
> > the 'xl shutdown' when we are truly in the power off sequence.
> > That means the user can do multiple 'xl shutdown' and we will try
> > to act on them instead of ignoring them.
> Applied to devel/for-linus-3.15
> > Fixes-Bug: http://bugs.xenproject.org/xen/bug/6
> > Reported-by: Alex Bligh <alex@xxxxxxxxxxx>
> > Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> > [v2: Add switch statement]
> > [v3: Add a reboot notifier]
> Can you put this version information after the --- in future?
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