Re: [PATCH v4 7/8] docs/microvm.txt: document the new microvm machine type

[Paolo Bonzini]

On 26/09/19 08:23, Sergio Lopez wrote:
> 
> There's still one problem. If the Guest doesn't have TSC_DEADLINE_TIME,
> Linux hangs on APIC timer calibration. I'm looking for a way to work
> around this. Worst case scenario, we can check for that feature and add
> both PIC and PIT if is missing.
> 

Huh, that's a silly thing that Linux is doing!  If KVM is in use, the
LAPIC timer frequency is known to be 1 GHz.

arch/x86/kernel/kvm.c can just set

        lapic_timer_period = 1000000000 / HZ;

and that should disabled LAPIC calibration if TSC deadline is absent.

Paolo

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