[Xen-bugs] [Bug 1378] New: [stubdom] cannot restore domain if the domain is created with stubdom on.

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1378

           Summary: [stubdom] cannot restore domain if the domain is created
                    with stubdom on.
           Product: Xen
           Version: unstable
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Unspecified
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: haicheng.li@xxxxxxxxx


Environment:
------------
Service Arch (ia32/ia32e/IA64): 
Guest Arch (ia32/ia32e/IA64): 
Guest OS Type (Linux/Windows):
Change Set: 18533
Hardware: SantaRosa/HP Desktop computer dc7700p


Bug detailed description:
--------------------------
with stubdom on, xm save <Domain> can be successful; but xm restore <Domain> is
failed.


Reproduce steps:
----------------
#
# "xm restore" has different behavior on SantaRosa and HP Desktop computer.


on SantaRosa:
1. [root@vt-sa3 shuang]# xm li
Name                                        ID   Mem VCPUs      State   Time(s)
Domain-0                                     0   670     2     r-----    629.3
hvmachine                                   12   256     2     -b----     24.5
hvmachine-dm                                13    32     1     -b----      2.2
2. [root@vt-sa3 shuang]# xm save hvmachine ./hvmachine.xm.save
3. [root@vt-sa3 shuang]# ls ./hvmachine.xm.save -lh
-rwxr-xr-x 1 root root 257M Oct 17 18:26 ./hvmachine.xm.save
4. [root@vt-sa3 shuang]# xm li
Name                                        ID   Mem VCPUs      State   Time(s)
Domain-0                                     0   670     2     r-----    634.6
5. [root@vt-sa3 shuang]# xm restore hvmachine.xm.save
6. [root@vt-sa3 shuang]# xm li
Name                                        ID   Mem VCPUs      State   Time(s)
Domain-0                                     0   670     2     r-----    652.5
hvmachine                                   14   256     2     -b----      8.9
hvmachine-dm                                15    32     1     -b----      0.2
7. In fact, the guest is not restored properly, it shows error messages in the
domains' screen, see attached picture.

1.[root@localhost simon]# xm save rhel4u1 ./rhel4u1.xm.save

2.[root@localhost simon]# ls ./rhel4u1.xm.save -lh
-rwxr-xr-x 1 root root 257M Oct 17 15:29 ./rhel4u1.xm.save

3.[root@localhost simon]# xm restore ./rhel4u1.xm.save 
Error: invalid device model signature read

Current result:
----------------
"xm restore" is failed to restore the stubdom based guest .


Basic root-causing log:
----------------------
bellow is the guest's config file:
[root@vt-sa3 shuang]# cat hvmachine.hvm
kernel = "/usr/lib/xen/boot/hvmloader"
builder='hvm'
memory =  256
name = "hvmachine"
vcpus=2
vif = [ 'ip=127.0.1.1,mac=aa:00:00:12:23:34' ]
device_model = '/usr/lib/xen/bin/stubdom-dm'
boot="c"
sdl=0
opengl=0
vnc=0
vncpasswd=''
stdvga=0
pae=1

[root@vt-sa3 shuang]# cat /etc/xen/hvmachine-dm
kernel = "/usr/lib/xen/boot/ioemu-stubdom.gz"
vif = [ '', 'ip=127.0.1.1,mac=aa:00:00:12:23:34' ]
disk = [ 'file:/home/shuang/ia32e_fc6.img,hda,w' ]
vfb = [ 'type=sdl' ]


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