Re: [Qemu-devel] [qemu-s390x] [PATCH v6 00/16] s390: vfio-ccw dasd ipl support

[Thomas Huth]

On 05/04/2019 08.58, Thomas Huth wrote:
> On 04/04/2019 16.34, Jason J. Herne wrote:
>> This is to support booting from vfio-ccw dasd devices. We basically implement
>> the real hardware ipl procedure. This allows for booting Linux guests on
>> vfio-ccw devices.
>>
>> vfio-ccw's channel program prefetch algorithm complicates ipl because most 
>> ipl
>> channel programs dynamically modify themselves. Details on the ipl process 
>> and
>> how we worked around this issue can be found in docs/devel/s390-dasd-ipl.txt.
> 
>  Hi Jason,
> 
> while running my s390-ccw bios tests, I noticed that network booting
> seems to be broken now. This used to work before:
> 
> s390x-softmmu/qemu-system-s390x -nographic -accel kvm \
>  -bios pc-bios/s390-ccw/s390-ccw.img \
>  -global s390-ipl.netboot_fw=pc-bios/s390-ccw/s390-netboot.img \
>  -netdev user,id=n1,tftp=/boot,bootfile=vmlinuz-4.18.0 \
>  -device virtio-net-ccw,netdev=n1,bootindex=1
> 
> Now it simply fails with "! No IPL device available !".
> 
> Could you have a look at it, please?

FWIW: The problem seems to be in the last patch: virtio_is_supported()
is now not called anymore, and so virtio_get_device_type() now returns
the wrong type.

 Thomas