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Re: [Qemu-devel] [PATCH/RFC 0/3] ais fixups for 2.11


From: Christian Borntraeger
Subject: Re: [Qemu-devel] [PATCH/RFC 0/3] ais fixups for 2.11
Date: Fri, 22 Sep 2017 13:27:16 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.0

On 09/22/2017 10:38 AM, Christian Borntraeger wrote:
> Conny, this seem to work on KVM (needs more testing and review).
> Can you check what happens with TCG?
> 
> Patch 1 is the known base patch,
> Patch 2 fixes the ais detection to be based on the flic interfaces
> Patch 3 disables ais for all compat machines <= 2.10
> 
> 
> 
> Christian Borntraeger (3):
>   s390x/ais: disable ais facility as it is broken
>   s390x/ais: enable ais when migration is available
>   s390x/ais: disable ais for compat machines
> 
>  hw/intc/s390_flic.c                | 11 +++++++++--
>  hw/intc/s390_flic_kvm.c            | 10 +++++++++-
>  hw/s390x/s390-virtio-ccw.c         | 18 ++++++++++++++++--
>  include/hw/s390x/s390-virtio-ccw.h |  3 +++
>  include/hw/s390x/s390_flic.h       |  1 +
>  target/s390x/cpu_models.c          |  6 ++++++
>  target/s390x/kvm.c                 |  3 +--
>  7 files changed, 45 insertions(+), 7 deletions(-)
> 

FWIW, with patch 1 backported to 2.10 and patches 1,2,3 on top of current 
master (as 211)
I started some crossmigration test and successfully tested
the following combinations with KVM and -cpu host on an 4.13 kernel

Machine s390-ccw-virtio-2.11
211-->211       

Machine s390-ccw-virtio-2.10
211-->210,211   
210-->210,211   

Machine s390-ccw-virtio-2.9
211-->29,210,211
210-->29,210,211
29--->29,210,211

Machine s390-ccw-virtio-2.8
211-->28,29,210,211
210-->28,29,210,211
29--->28,29,210,211
28--->28,29,210,211

Machine s390-ccw-virtio-2.7
211-->27,28,29,210,211
210-->27,28,29,210,211
29--->27,28,29,210,211
28--->27,28,29,210,211
27--->27,28,29,210,211

Machine s390-ccw-virtio-2.6
211-->26 27 28 29 210 211
210-->26 27 28 29 210 211
29--->26 27 28 29 210 211
28--->26 27 28 29 210 211
27--->26 27 28 29 210 211
26--->26 27 28 29 210 211




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