[Xen-devel] Re: [PATCH 0/3] xen: Use PM/Hibernate events for save/restore/chkpt

[Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx>]

On Sun, 2011-02-20 at 07:49 +0000, Pavel Machek wrote:
> On Sat 2011-02-19 15:12:35, Shriram Rajagopalan wrote:
> > The current implementation of xen guest save/restore/checkpoint 
> > functionality
> > uses PM_SUSPEND and PM_RESUME events. This is not optimal when taking
> > checkpoints of a virtual machine (where the suspend hypercall returns
> > non-zero, requiring the devices and xenbus to just pickup from where they 
> > left
> > off instead of a complete teardown/reconnect to backend). 
> > 
> > The following set of patches modify this implementation to use Hibernate 
> > style
> > control flow (freeze/restore for save/restore and freeze/thaw for 
> > checkpoint,
> > which is merely a cancelled save akin to failed swsusp() ).
> > 
> > These patches are against Ian Campbell's PVHVM tree at
> > git://xenbits.xen.org/people/ianc/linux-2.6.git for-stefano/pvhvm
> > 
> > at commit 8a8d1bc753c4e2dda5f2890292d60c67d6ebb573
> > kernel version: 2.6.38-rc4
> 
> Series looks ok to me...

Thanks Pavel, may we take that as an Acked-by?

For my part the Xen side is:
Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>

The changes to drivers/xen/manage.c depend on some other cleanups made
on the Xen side (in linux-next soon if not already via Stefano's tree)
so how would you like to handle them? I could point you to a suitable to
apply the pm.h bits to or we could carry them in the Xen tree if you are
happy with them.

Ian.


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