Paolo Bonzini <pbonzini@xxxxxxxxxx> writes: > 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. Given that they can only be omitted when an specific set of conditions is met, I think I'm going to make them optional but enabled by default. I'll also point to this in the documentation. Thanks, Sergio
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