Re: [RFC PATCH v2 38/69] KVM: x86: Add option to force LAPIC expiration wait

[Sean Christopherson]

On Tue, Jul 06, 2021, Paolo Bonzini wrote:
> On 03/07/21 00:04, isaku.yamahata@xxxxxxxxx wrote:
> > From: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
> > 
> > Add an option to skip the IRR check in kvm_wait_lapic_expire().  This
> > will be used by TDX to wait if there is an outstanding notification for
> > a TD, i.e. a virtual interrupt is being triggered via posted interrupt
> > processing.  KVM TDX doesn't emulate PI processing, i.e. there will
> > never be a bit set in IRR/ISR, so the default behavior for APICv of
> > querying the IRR doesn't work as intended.
> > 
> > Signed-off-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
> > Signed-off-by: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
> 
> Is there a better (existing after the previous patches) flag to test, or
> possibly can it use vm_type following the suggestion I gave for patch 28?

Not sure if there's a "better" flag, but there's most definitely a flag somewhere
that will suffice :-)