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Re: [Qemu-devel] [PATCH RFC 4/8] i386/kvm: Implement 'hv-all' pass-throu
From: |
Vitaly Kuznetsov |
Subject: |
Re: [Qemu-devel] [PATCH RFC 4/8] i386/kvm: Implement 'hv-all' pass-through mode |
Date: |
Tue, 29 Jan 2019 16:20:33 +0100 |
"Dr. David Alan Gilbert" <address@hidden> writes:
> I'm not sure what the equivalent bear traps are in the Hyper-V world,
> but I'd be surprised if there weren't any; for example what happens
> when someone upgrades one of their hosts to some minor version that
> adds/removes a feature?
Here we're talking about Hyper-V emulation in KVM, features only get
added there, but even if it gets removed it will be detected by libvirt ...
>
> Also, how does libvirt figure out that the features are actually the
> same - does it need a bunch of detection code?
... as I *think* it compares Feature CPUID words (and all Hyper-V
features which we enable with hv-all are there).
--
Vitaly
- [Qemu-devel] [PATCH RFC 3/8] i386/kvm: move Hyper-V CPUID filling to hyperv_handle_properties(), (continued)
- [Qemu-devel] [PATCH RFC 3/8] i386/kvm: move Hyper-V CPUID filling to hyperv_handle_properties(), Vitaly Kuznetsov, 2019/01/25
- [Qemu-devel] [PATCH RFC 5/8] i386/kvm: hv-evmcs requires hv-vapic, Vitaly Kuznetsov, 2019/01/25
- [Qemu-devel] [PATCH RFC 4/8] i386/kvm: Implement 'hv-all' pass-through mode, Vitaly Kuznetsov, 2019/01/25
- Re: [Qemu-devel] [PATCH RFC 4/8] i386/kvm: Implement 'hv-all' pass-through mode, Roman Kagan, 2019/01/25
- Re: [Qemu-devel] [PATCH RFC 4/8] i386/kvm: Implement 'hv-all' pass-through mode, Vitaly Kuznetsov, 2019/01/25
- Re: [Qemu-devel] [PATCH RFC 4/8] i386/kvm: Implement 'hv-all' pass-through mode, Roman Kagan, 2019/01/28
- Re: [Qemu-devel] [PATCH RFC 4/8] i386/kvm: Implement 'hv-all' pass-through mode, Vitaly Kuznetsov, 2019/01/28
- Re: [Qemu-devel] [PATCH RFC 4/8] i386/kvm: Implement 'hv-all' pass-through mode, Dr. David Alan Gilbert, 2019/01/28
- Re: [Qemu-devel] [PATCH RFC 4/8] i386/kvm: Implement 'hv-all' pass-through mode, Eduardo Habkost, 2019/01/28
- Re: [Qemu-devel] [PATCH RFC 4/8] i386/kvm: Implement 'hv-all' pass-through mode, Vitaly Kuznetsov, 2019/01/29
- Re: [Qemu-devel] [PATCH RFC 4/8] i386/kvm: Implement 'hv-all' pass-through mode,
Vitaly Kuznetsov <=
- Re: [Qemu-devel] [PATCH RFC 4/8] i386/kvm: Implement 'hv-all' pass-through mode, Dr. David Alan Gilbert, 2019/01/29
- Re: [Qemu-devel] [PATCH RFC 4/8] i386/kvm: Implement 'hv-all' pass-through mode, Daniel P . Berrangé, 2019/01/29
[Qemu-devel] [PATCH RFC 6/8] i386/kvm: hv-stimer requires hv-time and hv-synic, Vitaly Kuznetsov, 2019/01/25
[Qemu-devel] [PATCH RFC 7/8] i386/kvm: hv-tlbflush/ipi require hv-vpindex, Vitaly Kuznetsov, 2019/01/25
[Qemu-devel] [PATCH RFC 8/8] i386/kvm: add support for Direct Mode for Hyper-V synthetic timers, Vitaly Kuznetsov, 2019/01/25
[Qemu-devel] [PATCH RFC 1/8] Update linux headers (5.0-rc2), Vitaly Kuznetsov, 2019/01/25
Re: [Qemu-devel] [PATCH RFC 0/8] i386/kvm/hyper-v: refactor and implement 'hv-stimer-direct' and 'hv-all' enlightenments, no-reply, 2019/01/31