Re: [Xen-devel] Live vm migration broken in latest xen-unstable

[Yoshiaki Tamura <tamura.yoshiaki@xxxxxxxxxxxxx>]

sanjay kushwaha wrote:
> Hi Ewan,
> I did a "hg pull -u" on my tree which also got the changeset 11422. but 
> I am
> still facing the same problem. btw this changeset seems to be specific to
> hvm domain while I am facing this problem with paravirtualized domain.
>
> Thanks,
> Sanjay
I've tested live migration with paravirt domain for changeset 11429,
but didn't have such a problem.
Did you also rebuild xen and dom0 kernel after you updated the repository?
If not, I would recommend to do so.

Yoshi Tamura

> On 9/5/06, Ewan Mellor <ewan@xxxxxxxxxxxxx> wrote:
> > On Fri, Sep 01, 2006 at 05:36:00PM -0400, sanjay kushwaha wrote:
> >
> > > Folks,
> > > I am experiencing that live migration is not working in latest
> > > xen-unstable. I get the following message during migration
> > >
> > > [root@pc5 ksanjay]# xm migrate --live 1 [1]199.77.138.23
> > > Error: /usr/lib/xen/bin/xc_save 18 1 0 0 1 failed
> > > [root@pc5 ksanjay]#
> > >
> > > I traced the problem to a function in xen named set_sh_allocation() in
> > > file xen/arch/x86/mm/shadow/common.c
> > >
> > > tools/libxc/xc_linux_save.c:xc_linux_save() is called from the python
> > > script which makes the following hypercall
> > >
> > >     if (live) {
> > >         if (xc_shadow_control(xc_handle, dom,
> > >                               XEN_DOMCTL_SHADOW_OP_ENABLE_LOGDIRTY,
> > >                               NULL, 0, NULL, 0, NULL) < 0) {
> > >             ERR("Couldn't enable shadow mode");
> > >             goto out;
> > >         }
> > >         last_iter = 0;
> > >     } else {
> > > -----------
> > >
> > > this particular hypercall leads to the call of set_sh_allocation which
> > > fails in the following code
> > >
> > >         if ( d-> arch.shadow.total_pages < pages )
> > >         {
> > >             /* Need to allocate more memory from domheap */
> > >             pg = alloc_domheap_pages(NULL, SHADOW_MAX_ORDER, 0);
> > >             if ( pg == NULL )
> > >             {
> > >                 SHADOW_PRINTK("failed to allocate shadow pages.\n");
> > >                 return -ENOMEM;
> > >             }
> > >
> > > alloc_domheap_pages fails and returns NULL. however I think I have
> > enough
> > > memory available so this function should not fail.
> > >
> > > Is there anybody else experiencing the same problem? Could someone
> > please
> > > tell me how to fix it?
> >
> > I've put some changes into xen-unstable today which might help.  The last
> > fix
> > is on its way through testing now.  Look out for xen-unstable changeset
> > 11422, and try that, see how you get on.
> >
> > Cheers,
> >
> > Ewan.
>
>
>
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--
TAMURA, Yoshiaki

NTT Cyber Space Labs
OSS Computing Project
Kernel Group
E-mail: tamura.yoshiaki@xxxxxxxxxxxxx
TEL: (046)-859-2771
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