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Re: [Qemu-devel] X86CPU "feature-words" property on QEMU (was Re: [PATCH
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] X86CPU "feature-words" property on QEMU (was Re: [PATCH v3 1/3] x86: Data structure changes to support MSR based) features |
Date: |
Fri, 17 Aug 2018 19:59:40 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 |
On 17/08/2018 19:48, Eduardo Habkost wrote:
> So let's do what's necessary to remove it. But I don't think the
> removal of "feature-words" should block the inclusion of this
> series.
>
> Now, should QOM properties follow our feature deprecation policy,
> or they were never a supported external API and we can remove it
> immediately?
>
> CCing Jiri and libvir-list, because I just found that there's
> code on libvirt that uses it, but I don't know exactly it does
> with that info.
It is used to check whether the host supports invtsc and pv-unhalt and
avoid changing the guest ABI when migrating: see
https://marc.info/?l=libvir-list&m=152445761414746&w=2 for a patch that
introduces one user.
I think we should extend it to MSRs, not remove it.
Paolo
[Qemu-devel] [PATCH v3 2/3] kvm: Add support to KVM_GET_MSR_FEATURE_INDEX_LIST and KVM_GET_MSRS system ioctl, Robert Hoo, 2018/08/10
- Re: [Qemu-devel] [PATCH v3 2/3] kvm: Add support to KVM_GET_MSR_FEATURE_INDEX_LIST and KVM_GET_MSRS system ioctl, Eduardo Habkost, 2018/08/17
- Re: [Qemu-devel] [PATCH v3 2/3] kvm: Add support to KVM_GET_MSR_FEATURE_INDEX_LIST and KVM_GET_MSRS system ioctl, Robert Hoo, 2018/08/18
- Re: [Qemu-devel] [PATCH v3 2/3] kvm: Add support to KVM_GET_MSR_FEATURE_INDEX_LIST and KVM_GET_MSRS system ioctl, Eduardo Habkost, 2018/08/18
- Re: [Qemu-devel] [PATCH v3 2/3] kvm: Add support to KVM_GET_MSR_FEATURE_INDEX_LIST and KVM_GET_MSRS system ioctl, Robert Hoo, 2018/08/23
- Re: [Qemu-devel] [PATCH v3 2/3] kvm: Add support to KVM_GET_MSR_FEATURE_INDEX_LIST and KVM_GET_MSRS system ioctl, Eduardo Habkost, 2018/08/23
- Re: [Qemu-devel] [PATCH v3 2/3] kvm: Add support to KVM_GET_MSR_FEATURE_INDEX_LIST and KVM_GET_MSRS system ioctl, Paolo Bonzini, 2018/08/23
- Re: [Qemu-devel] [PATCH v3 2/3] kvm: Add support to KVM_GET_MSR_FEATURE_INDEX_LIST and KVM_GET_MSRS system ioctl, Eduardo Habkost, 2018/08/23
- Re: [Qemu-devel] [PATCH v3 2/3] kvm: Add support to KVM_GET_MSR_FEATURE_INDEX_LIST and KVM_GET_MSRS system ioctl, Paolo Bonzini, 2018/08/23