Re: [Qemu-devel] [PATCH] s390/kvm_virtio/linux-headers: remove traces of old virtio transport

[Christian Borntraeger <borntraeger@de.ibm.com>]

On 11/15/2017 06:10 PM, Cornelia Huck wrote:
> On Wed, 15 Nov 2017 16:42:23 +0100
> Christian Borntraeger <borntraeger@de.ibm.com> wrote:
> 
>> We no longer support the old s390 transport, neither does the newest
>> Linux kernel. Remove it from the linux header script as well as the
>> s390x virtio code.  We still should handle the VIRTIO_NOTIFY hypercall,
>> to tolerate early printk on older guest kernels without an sclp console.
> 
> Are there any such guests still around? Wouldn't they be unable to run
> because of the missing old transport anyway?

As far as I can see even an 4.13 will do

static int __init s390_virtio_console_init(void)
{
        if (sclp.has_vt220 || sclp.has_linemode)
                return -ENODEV;
        return virtio_cons_early_init(early_put_chars);
}
console_initcall(s390_virtio_console_init);

No matter if there is the old transport or not available.

So as soon as somebody chooses virtio-console you should see the diag500 from the early
printk.


> 
>> We continue to ignore these events.
>>
>> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
>> ---
>>  hw/s390x/s390-virtio-hcall.h                   |  6 ++-
>>  include/standard-headers/asm-s390/kvm_virtio.h | 64 --------------------------
>>  scripts/update-linux-headers.sh                |  1 -
>>  3 files changed, 4 insertions(+), 67 deletions(-)
>>  delete mode 100644 include/standard-headers/asm-s390/kvm_virtio.h
>