Re: [Xen-devel] [PATCH v9] new config option vtsc_tolerance_khz to avoid TSC emulation

[Olaf Hering <olaf@xxxxxxxxx>]

Am Thu, 07 Jun 2018 07:31:26 -0600
schrieb "Jan Beulich" <JBeulich@xxxxxxxx>:

> Hmm, I find this description concerning. Is the field reliably zero when
> coming from older Xen, or is it not?

It depends on how old.
If the other sending side has write_tsc_info from 4.6+, then _res1 is zero.
If it is older, the XC_SAVE_ID_TSC_INFO is eventually not handled anymore.
At least I could not find the relevant code, even in staging-4.6.
But then, it is unlikely that migration from 4.5 to 4.6 did not work.

Also, in general the input comes from "remote". So it is untrusted.

Olaf

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