Xen devel - Aug 2007 - HVM Live Migration: Failed to populate physmap

Hi Folks,
I am trying to do Live HVM migration on Intel VT (x86_64) platforms. The HVM
save on the source machine completes without error but the destination
machine restore fails with the following error in the qemu-dm.log file. the
xend.log doesn''t contain any errors. Below are the details. Is this a
known
problem? Does anyone know how to fix this?

I really appreciate your help.

[root@vt1 xen]# cat qemu-dm-5.log

<snip>
shift keysym 003f keycode 53
char device redirected to /dev/pts/1
cirrus_vga_load:re-enable vga acc.lfb_addr=0xf0000000, lfb_end=0xf0800000.
Failed allocation for dom 5: 2048 extents of order 0
Failed to populate physmap
[root@vt1 xen]#

I am trying with the latest xen tree that I pulled yesterday. Here is the xm
info.

[root@vt1 ~]# xm info
host                   : vt1
release                : 2.6.18-xen
version                : #2 SMP Tue Aug 21 14:42:35 EDT 2007
machine                : x86_64
nr_cpus                : 2
nr_nodes               : 1
sockets_per_node       : 1
cores_per_socket       : 2
threads_per_core       : 1
cpu_mhz                : 3000
hw_caps                :
bfebfbff:20100800:00000000:00000180:0000e4f5:00000000:00000001
total_memory           : 1011
free_memory            : 0
node_to_cpu            : node0:0-1
xen_major              : 3
xen_minor              : 0
xen_extra              : -unstable
xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32
hvm-3.0-x86_32p hvm-3.0-x86_64
xen_scheduler          : credit
xen_pagesize           : 4096
platform_params        : virt_start=0xffff800000000000
xen_changeset          : Thu Aug 16 13:27:59 2007 +0100 15730:256160ff19b7
cc_compiler            : gcc version 3.4.5 20051201 (Red Hat 3.4.5-2)
cc_compile_by          : ksanjay
cc_compile_domain      :
cc_compile_date        : Tue Aug 21 14:27:23 EDT 2007
xend_config_format     : 4
[root@vt1 ~]#


Here is the guest configuration:
[ksanjay@vt2 ~]$ cat xmexample.hvm
#  -*- mode: python; -*-

import os, re
arch = os.uname()[4]
if re.search(''64'', arch):
    arch_libdir = ''lib64''
else:
    arch_libdir = ''lib''

kernel = "/usr/lib/xen/boot/hvmloader"

builder=''hvm''
memory = 128

shadow_memory = 8

name = "vm"

vcpus=1
vif = [ ''type=ioemu, bridge=eth0'' ]

disk = [ ''file:/home/ksanjay/images/hd.img,ioemu:hda,w'' ]

device_model = ''/usr/'' + arch_libdir +
''/xen/bin/qemu-dm''

sdl=0

vnc=1

#vncdisplay=1

#vncunused=1

#vncconsole=0

nographic=0
stdvga=0
serial=''pty''
[ksanjay@vt2 ~]$

The guest VM is a linux 2.6.16.13.
-- 
----------------------
PhD Candidate, Georgia Tech
http://www.cc.gatech.edu/~ksanjay/


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> I am trying to do Live HVM migration on Intel VT (x86_64) platforms. The 
> HVM
> save on the source machine completes without error but the destination
> machine restore fails with the following error in the qemu-dm.log file. 
> the
> xend.log doesn''t contain any errors. Below are the details. Is
this a
> known
> problem? Does anyone know how to fix this?
This is just an kinda unhelpful version of "Out of memory" ;-)
> Failed allocation for dom 5: 2048 extents of order 0
> Failed to populate physmap
[snip]
> total_memory           : 1011
> free_memory            : 0

cheers,

S.


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