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Re: [Qemu-devel] [PATCH v1 RFC 6/6] KVM: s390: add cpu model support
From: |
Christian Borntraeger |
Subject: |
Re: [Qemu-devel] [PATCH v1 RFC 6/6] KVM: s390: add cpu model support |
Date: |
Thu, 22 May 2014 22:36:59 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux i686; rv:24.0) Gecko/20100101 Thunderbird/24.5.0 |
On 22/05/14 10:53, Paolo Bonzini wrote:
> Il 22/05/2014 10:23, Michael Mueller ha scritto:
>> On Wed, 21 May 2014 15:22:35 +0200
>> Alexander Graf <address@hidden> wrote:
>>
>> I have seen the slides from Eduardo which he presented during this years
>> DevConf in Brno and made my comments according the s390x implementation
>> on that. Is you will see, this is mostly overlapping except for the model
>> definition authority that I clearly see on qemu's side.
>>
>> See pdf attachment.
>
> More comments:
>
> - "Only one machine type in s390 case which is -machine s390-virtio-ccw"
>
> This probably should change sooner or later, as soon as the implementation
> becomes stable enough. Versioning is necessary for live migration across
> different QEMU version. Perhaps start versioning in 2.2, i.e. start making
> s390-virtio-ccw-2.1 an alias for s390-virtio-ccw now?
>
> Note that new virtio device features can appear at any time outside the s390
> code, and will take part in versioning as well.
>
> - "No enforce option"
>
> Strongly suggest making enforce the only possible behavior.
>
> - "Not in the s390x case, because the KVM facility mask limits the cpu model
> specific facilities"
>
> What if the KVM facility mask changes? For x86, nowadays new CPUID bits are
> only introduced in KVM when a new processors comes out. But if we introduced
> an older CPUID bit, it would be a huge complication for backwards
> compatibility. Is it different for s390?
>
> Paolo
>
I guess we need to have a full picture here. Would this topic be suitable for
the KVM call?
Christian
- Re: [Qemu-devel] [PATCH v1 RFC 6/6] KVM: s390: add cpu model support, (continued)
- Re: [Qemu-devel] [PATCH v1 RFC 6/6] KVM: s390: add cpu model support, Alexander Graf, 2014/05/19
- Re: [Qemu-devel] [PATCH v1 RFC 6/6] KVM: s390: add cpu model support, Michael Mueller, 2014/05/19
- Re: [Qemu-devel] [PATCH v1 RFC 6/6] KVM: s390: add cpu model support, Alexander Graf, 2014/05/19
- Re: [Qemu-devel] [PATCH v1 RFC 6/6] KVM: s390: add cpu model support, Michael Mueller, 2014/05/20
- Re: [Qemu-devel] [PATCH v1 RFC 6/6] KVM: s390: add cpu model support, Alexander Graf, 2014/05/20
- Re: [Qemu-devel] [PATCH v1 RFC 6/6] KVM: s390: add cpu model support, Michael Mueller, 2014/05/21
- Re: [Qemu-devel] [PATCH v1 RFC 6/6] KVM: s390: add cpu model support, Alexander Graf, 2014/05/21
- Re: [Qemu-devel] [PATCH v1 RFC 6/6] KVM: s390: add cpu model support, Michael Mueller, 2014/05/22
- Re: [Qemu-devel] [PATCH v1 RFC 6/6] KVM: s390: add cpu model support, Paolo Bonzini, 2014/05/22
- Re: [Qemu-devel] [PATCH v1 RFC 6/6] KVM: s390: add cpu model support, Michael Mueller, 2014/05/22
- Re: [Qemu-devel] [PATCH v1 RFC 6/6] KVM: s390: add cpu model support,
Christian Borntraeger <=
- Re: [Qemu-devel] [PATCH v1 RFC 6/6] KVM: s390: add cpu model support, Alexander Graf, 2014/05/22
[Qemu-devel] [PATCH v1 RFC 2/6] KVM: s390: split SIE state guest prefix field, Michael Mueller, 2014/05/13
[Qemu-devel] [PATCH v1 RFC 4/6] KVM: s390: add ibc api, Michael Mueller, 2014/05/13
Re: [Qemu-devel] [PATCH v1 RFC 0/6] KVM: s390: cpu model implementation, Christian Borntraeger, 2014/05/16