Re: qemu install

On 18/05/2020 18:17, Viktor Mihajlovski wrote:
> On 5/17/20 8:57 PM, Valentin Vidić wrote:
>> Hi,
>>
>> I'm trying to install a s390x VM using qemu:
>>
>> $ qemu-system-s390x -machine s390-ccw-virtio -nographic \
>>    --cdrom debian-10.4.0-s390x-netinst.iso \
>>    -kernel boot/linux_vm -initrd boot/root.bin -append init=/bin/sh
>>
>> but it doesn't seem to work - there is no network, cdrom or disk.
>> Should this work or is this usecase not supported?
>>
>
> I'd recommend to try virt-install, see 
> http://kvmonz.blogspot.com/p/knowledge-use-virt-install-for-kvm.html. 
> virt-install will set up the VM in a proper way.
>
> You will need to invoke virt-install with --arch=s390x if your running 
> on an x86 box and make sure you have the qemu-system-s390x package 
> installed.
>
> Chance for success will probably increase with the currency of the 
> QEMU used.
>
> The invocation you've reported above doesn't instantiate a virtio disk 
> and network interface (which are the only device types supported for 
> s390x. Similary virtual CD/DVD must be on virtio-scsi for s390x. 
> Again, virt-install and virsh are your friends here 


I mounted the s390x installation media/iso (debian stretch) on 
'loopdir'. Installed straight to hd (eckd), should work like this on 
image files, too.

Network script:

<code>

$ cat qemu-ifup

#!/bin/sh

set -x

switch=inst0

if [ -n "$1" ];then

         # tunctl -u `whoami` -t $1 (use ip tuntap instead!)

         ip tuntap add $1 mode tap user `whoami`

         ip link set $1 up

         sleep 0.5s

         # brctl addif $switch $1 (use ip link instead!)

         ip link set $1 master $switch

         exit 0

else

         echo "Error: no interface specified"

         exit 1

fi

</code>

Call to qemu:

<code>

$ qemu-system-s390x -M s390-ccw-virtio -m 1G -smp 1 -enable-kvm 
-nographic -device virtio-net-ccw,netdev=mynet0 -netdev 
tap,id=mynet0,script=qemu-ifup -drive 
file=/dev/disk/by-path/ccw-0.0.xxxx -kernel loopdir/boot/linux_vm 
-initrd loopdir/boot/root.bin -append 
'debian-installer/allow_unauthenticated=true'

This works on a z13 and z14. Works also fine with clefOS (CentOS clone).


Best,

Ben.