Re: [Xen-devel] [PATCH v3] new config option vtsc_tolerance_khz to avoid TSC emulation

[Olaf Hering <olaf@xxxxxxxxx>]

Am Tue, 6 Mar 2018 11:07:54 +0000
schrieb Andrew Cooper <andrew.cooper3@xxxxxxxxxx>:

> > Add a new domctl XEN_DOMCTL_set_vtsc_tolerance_khz to adjust the
> > tolerance value of a running domU that is supposed to be migrated.  
> Please can we not proliferate the domctls.
> This looks like it should be part of the set_tsc_info hypercall, not a
> separate hypercall.

How should this approach be implemented? To me it looks like set_tsc_info
should be called only once for a not-yet-active domU, but I'm not familiar
with timekeeping.
If it can be just called once, and there should be a way to adjust the 
tolerance value, then XEN_DOMCTL_settscinfo would need to be changed to 
have subcommands.

Olaf

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