Re: [Xen-users] 64 bit dom0 and 32 bit HVM

[Jason Solan <jsolan@xxxxxxxxxxxxxxxxxxxx>]

Another followup.
I played around with my domU and its initrd for about an hour or so and
could not get it to boot.  This was a fedora 7 domU.  I then tried to
install a 32-bit F7 HVM and could not even get the DVD to boot on either
RHEL 5 (3.0.3) or F7 (3.1) 64-bit dom0's that I have running.  I feel
there is something wrong with either my download of 32-bit or installing
32-bit F7 on a 64-bit dom0.  I've used the actual download to install a
system though so I'm leaning towards the latter.  Thats an issue for
another time though.

Anyway, once i realized that F7 was the issue, i installed the standard
kernel on one of my FC6 domU's running PV.  I then modified my config to
be the same as posted before.  I did not change the fstab this time.

The FC6 domU booted straight up on RHEL 5 64-bit dom0 when choosing the
standard kernel in grub.


On Tue, 2007-08-07 at 09:03 -0400, Jason Solan wrote:
> Ok, i just tried this on RHEL 5 (3.0.3) to see what the issue is.
> 
> I installed the normal kernel on domU, like you did.
> Adjusted the config to go off of the HVM and 64 bit device_model.
> 
> It still just hung.  Then I realized the key difference between that
> file and my other HVM's.  Its the vif line.  I had to specify the type
> of "ioemu"
> 
> vif = [ 'mac=00:16:3e:3f:a9:f5, type=ioemu, bridge=xenbr1', ]
> 
> I ran into partition problems though and get a kernel panic immediately
> after boot because the PV domU was using xvda not hda.  I'm running into
> more and more issues because the domU guest is fedora which uses labels
> for disks.  It looks like my initrd is not pointing to the correct
> devices and I'll need to change my fstab and grub.conf.
> 
> Its still not working, but it at least gets you passed the step that
> your on.  I don't know if i'll have time today to work through the
> partition issues or not, but if you are running a non redhat flavor on
> your domU you might not even have these problems.
> 
> my config:
> 
> name = "test"
> memory = "256"
> vcpus=1
> apic=1
> acpi=1
> pae=1
> builder = "hvm"
> device_model = "/usr/lib64/xen/bin/qemu-dm"
> kernel = "/usr/lib/xen/boot/hvmloader"
> disk = [ 'file:/xen/linux/f7/test/test.img,hda,w', ]
> vif = [ 'mac=00:16:3e:4f:04:01, type=ioemu, bridge=xenbr3', ]
> #vfb = ["type=vnc,vncunused=1,vnclisten=0.0.0.0"]
> vnc=1
> vncunused=1
> #vncdisplay=7
> on_reboot   = 'restart'
> on_crash    = 'restart'
> 
> 
> 
> On Tue, 2007-08-07 at 08:59 +0200, Riccardo Veraldi wrote:
> > Yes it hangs anyway...
> > 
> > I think on Fedora 7 Xen is version 3.1 while on my distribution
> > I still have Xen 3.0.3
> > 
> > thanks anyway.
> > 
> > Riccardo
> > 
> > 
> > Jason Solan wrote:
> > > I can't say that I've tried moving a PV 32 bit to HVM 32 bit on RHEL 5
> > > 64 bit, but i have done it on fedora 7.  I feel pretty comfortable
> > > saying that it should work the same on RHEL 5.
> > >
> > > With a 64 bit dom0 I've found that the device_model has to be the lib64
> > > version or it hangs (similar to the issue you're seeing).  Do you have
> > > any fully virtualized domU's on this system?
> > >
> > > I suggest trying:
> > >
> > > device_model = "/usr/lib64/xen/bin/qemu-dm"
> > >
> > >
> > >
> > > On Mon, 2007-08-06 at 19:57 +0200, Riccardo Veraldi wrote:
> > >   
> > >> Hello,
> > >> I have a 64 bit dom0 with RHEL5
> > >>
> > >> I have a 32 bit domU para virtualized
> > >>
> > >> I want to bring it on my new dom0
> > >>
> > >> so I installed a non xen kernel on the domU
> > >> and I copyed the image file on hte dom0
> > >>
> > >> I changed the /etc/xen/myhost accordingly
> > >>
> > >> but when I start the domain it hangs and nothing happens
> > >>
> > >> here is
> > >>
> > >> /etc/xen/sympa5_3_2
> > >>
> > >> name = "sympa5_3_2"
> > >> builder = "hvm"
> > >> memory = "1024"
> > >> disk = [ 'file:/xen/domU/sympa5_3_2,hda,w', ]
> > >> vif = [ 'mac=00:16:3e:3f:a9:f5, bridge=xenbr1', ]
> > >> vfb = ["type=vnc,vncunused=1"]
> > >> uuid = "ffc68565-354a-32da-7302-72a1bd5ff1af"
> > >> device_model = "/usr/lib/xen/bin/qemu-dm"
> > >> kernel = "/usr/lib/xen/boot/hvmloader"
> > >> vcpus=1
> > >> on_reboot   = 'restart'
> > >> on_crash    = 'restart'
> > >>
> > >>
> > >> I Also took a qemu-dm and used it insted of the default one which is 
> > >> 64bit
> > >>
> > >> [root@xenserver2 xen]# xm create /etc/xen/sympa5_3_2 -c
> > >> Using config file "/etc/xen/sympa5_3_2".
> > >>
> > >>
> > >> nothing happens:
> > >> [root@xenserver2 ~]# xm list
> > >> Name                                      ID Mem(MiB) VCPUs State   
> > >> Time(s)
> > >> Domain-0                                   0     2976     4 r-----    
> > >> 605.2
> > >> sympa5_3_2                                10     1030     1 --p---      
> > >> 0.0
> > >>
> > >> [root@xenserver2 ~]# xm unpause sympa5_3_2
> > >>
> > >> [root@xenserver2 ~]# xm list
> > >> Name                                      ID Mem(MiB) VCPUs State   
> > >> Time(s)
> > >> Domain-0                                   0     2976     4 r-----    
> > >> 605.5
> > >> sympa5_3_2                                10     1030     1 ------      
> > >> 0.0
> > >>
> > >> bit nothing happens.
> > >>
> > >> is there a way so that I Can bring my domU running on a 32 bit dom0
> > >> para virtualized on my new 64 bit xen fully virtualized dom0 ?
> > >>
> > >> thanks a lot
> > >>
> > >> Rick
> > >>
> > >>
> > >> _______________________________________________
> > >> Xen-users mailing list
> > >> Xen-users@xxxxxxxxxxxxxxxxxxx
> > >> http://lists.xensource.com/xen-users
> > >>     
> > >
> > >
> > > _______________________________________________
> > > Xen-users mailing list
> > > Xen-users@xxxxxxxxxxxxxxxxxxx
> > > http://lists.xensource.com/xen-users
> > >   
> > 
> 
> 
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