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

[Eduardo Habkost]

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.

-- 
Eduardo