[SeaBIOS] [PATCH] tsc: use kvmclock for calibration

[Gerd Hoffmann]

  Hi,

>> So what do you suggest?  The options I see are:
>>
>>   (1) Use this patch (with alignment issue fixed of course).
>>   (2) Do a full kvmclock implementation.  Feels a bit like overkill.
>>   (3) SeaBIOS can fallback to the PIT for timing on machines which
>>       have no TSC.  We could do that too in case we detect kvm ...
> 
> What sort of timeouts are these?  If seconds, maybe the rtc would be best.

All sorts of timeouts, from a few miliseconds to seconds.

The problematic ones are the longer timeouts, which wait for I/O stuff
like disk reads complete.  The stuff with smaller timeouts (like waiting
for AHCI link become ready) tend to finish instantly in kvm.

cheers,
  Gerd