Re: KVM Nested L2 guest startup problems

[Paolo Bonzini]

Il 04/05/2014 18:33, Hu Yaohui ha scritto:
> > I experienced a similar problem that was related to nested code
> > having some bugs related to apicv and other new vmx features.
> >
> > For example, the code enabled posted interrupts to run L2 even when the
> > feature was not exposed to L1 and L1 didn't use it.
> >
> > Try changing prepare_vmcs02  to force disabling posted_interrupts,
> > code should looks like:
> >
> > ....
> > ....
> > exec_control = vmcs12->pin_based_vm_exec_control;
> > exec_control |= vmcs_config.pin_based_exec_ctrl;
> > exec_control &= ~(PIN_BASED_VMX_PREEMPTION_TIMER|PIN_BASED_POSTED_INTR);
> > vmcs_write32(PIN_BASED_VM_EXEC_CONTROL, exec_control);
> > ....
> > ...
> >
> > and also
> >
> > ...
> > ...
> > exec_control &= ~(SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES |
> >      SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY |
> >      SECONDARY_EXEC_APIC_REGISTER_VIRT |
> >      SECONDARY_EXEC_PAUSE_LOOP_EXITING);

PLE should be left enabled, I think.

Apart from that, I'll change the suggestion into a patch.

Thanks!

Paolo

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