On 30/09/21 21:14, Marcelo Tosatti wrote:

quoted

+   new_off_n = t_0 + off_n + (k_1 - k_0) * freq - t_1

Hi Oliver,

This won't advance the TSC values themselves, right?

Why not?  It affects the TSC offset in the vmcs, so the TSC in the VM is 
advanced too.

Paolo

This (advancing the TSC values by the realtime elapsed time) would be
awesome because TSC clock_gettime() vdso is faster, and some
applications prefer to just read from TSC directly.
See "x86: kvmguest: use TSC clocksource if invariant TSC is exposed".

The advancement with this patchset only applies to kvmclock.

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