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Re: [Qemu-devel] TSC frequency configuration & invtsc migration (was Re:

From: Marcelo Tosatti
Subject: Re: [Qemu-devel] TSC frequency configuration & invtsc migration (was Re: [PATCH 4/4] kvm: Allow migration with invtsc)
Date: Thu, 5 Jan 2017 08:50:48 -0200
User-agent: Mutt/1.5.21 (2010-09-15)

On Thu, Jan 05, 2017 at 08:48:32AM -0200, Marcelo Tosatti wrote:
> > Note that even if we follow your suggestion and implement an
> > alternative version of patch 4/4 to cover your use case, I will
> > strongly recommend libvirt developers to support configuring TSC
> > frequency if they want to support invtsc + migration without
> > surprising/unpredictable restrictions on migratability.
> Well, alright. If you make the TSC frequency of the host
> available to mgmt software as you describe, and write the steps mgmt
> software should take, i'm good.
> Thanks for the help Eduardo.

I'll be happy to not have to add a weird script to 

1. Query the host TSC frequency.
2. Pass that to -cpu xxx,tsc-frequency=ZZZ

To my migration scripts. 

Probably easy to make that the default behaviour...

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