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Re: [Qemu-devel] [PATCH 3/3] kvm-all: notice KVM of vcpu's TSC rate afte


From: Haozhong Zhang
Subject: Re: [Qemu-devel] [PATCH 3/3] kvm-all: notice KVM of vcpu's TSC rate after migration
Date: Tue, 6 Oct 2015 09:20:31 +0800
User-agent: Mutt/1.5.23 (2014-03-12)

On Wed, Sep 30, 2015 at 05:36:11PM -0300, Eduardo Habkost wrote:
> On Wed, Sep 30, 2015 at 08:32:26AM +0800, Haozhong Zhang wrote:
> > > [...]
> > > > > Or maybe we shouldn't treat this as VM state, but as configuration, 
> > > > > and
> > > > > let management configure the TSC frequency explicitly if the user 
> > > > > really
> > > > > needs it to stay the same during migration.
> > > > >
> > > > > (CCing libvir-list to see if they have feedback)
> > > > >
> > > > 
> > > > Thanks for CC. I'll consider to add a command line option to control
> > > > the configuration of guest TSC fequency.
> > > 
> > > It already exists, -cpu has a "tsc-freq" option.
> > >
> > 
> > What I'm considering is to add a "-keep-tsc-freq" option to control
> > whether the TSC frequency should be migrated if "tsc-freq" is not
> > presented. Compared to "tsc-freq", "-keep-tsc-freq" can free users
> > from figuring out the guest TSC frequency manually in the migration.
> 
> If you do that, please make it a property of the CPU object, so it will
> can be set as a "-cpu" option.
>

Yes, I'll do so.

- Haozhong

> -- 
> Eduardo
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