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

To: sanjay kushwaha <sanjay.kushwaha@xxxxxxxxx>
Subject: Re: [Xen-devel] Live vm migration broken in latest xen-unstable
From: Yoshiaki Tamura <tamura.yoshiaki@xxxxxxxxxxxxx>
Date: Thu, 07 Sep 2006 11:28:26 +0900
Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
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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.


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]
> 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
> memory available so this function should not fail.
> Is there anybody else experiencing the same problem? Could someone
> tell me how to fix it?

I've put some changes into xen-unstable today which might help.  The last
is on its way through testing now.  Look out for xen-unstable changeset
11422, and try that, see how you get on.




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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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Address: 1-1 Hikarinooka, Yokosuka
         Kanagawa 239-0847 JAPAN

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