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Re: [Qemu-devel] [PATCH v5 0/1] i386/kvm: TSC page clocksource for Hyper
From: |
Vitaly Kuznetsov |
Subject: |
Re: [Qemu-devel] [PATCH v5 0/1] i386/kvm: TSC page clocksource for Hyper-V-on-KVM fixes |
Date: |
Wed, 02 May 2018 09:34:19 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/25.3 (gnu/linux) |
Vitaly Kuznetsov <address@hidden> writes:
> Changes since v4:
> - Rebase on top of Roman's patches.
> - Drop PATCH2 as it is no longer needed (after adding explicit
> hv_frequencies).
>
> Previously, Ladi was working on enabling TSC page clocksource for nested
> Hyper-V-on-KVM workloads. He found out that if Hyper-V frequency MSRs are
> exposed to L1 as well as INVTSC flag Hyper-V enables TSC page clocksource
> to its guests. Qemu doesn't pass INVTSC by default as it is a migration
> blocker.
>
> I found out there's a different way to make Hyper-V like us: expose
> Reenlightenment MSRs to it. KVM doesn't fully support the feature as
> we're still unable to migrate nested environments but rudimentary support
> we have there is enough.
>
> Enable Hyper-V reenlightenment MSRs to make things work.
>
Gentle ping :-)
With Roman's Reviewed-by:, is there anything else needed from me to get
this accepted?
Thanks!
--
Vitaly
- Re: [Qemu-devel] [PATCH v5 0/1] i386/kvm: TSC page clocksource for Hyper-V-on-KVM fixes,
Vitaly Kuznetsov <=