Re: [PATCH 12/16] KVM: TDX: Inhibit APICv for TDX guest

[Sean Christopherson <seanjc@google.com>]

On Fri, Jan 17, 2025, Kai Huang wrote:
> On Fri, 2025-01-17 at 09:53 +0000, Huang, Kai wrote:
> > Btw, IIUC, in case of IRQCHIP split, KVM uses KVM_IRQ_ROUTING_MSI for routes of
> > GSIs.  But it seems KVM only allows level-triggered MSI to be signaled (which is
> > a surprising):
> > 
> > int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
> >                 struct kvm *kvm, int irq_source_id, int level, bool line_status)
> > {
> >         struct kvm_lapic_irq irq;
> > 
> >         if (kvm_msi_route_invalid(kvm, e))
> >                 return -EINVAL;
> > 
> >         if (!level)
> >                 return -1;
> > 
> >         kvm_set_msi_irq(kvm, e, &irq);
> > 
> >         return kvm_irq_delivery_to_apic(kvm, NULL, &irq, NULL);
> > }
> 
> Ah sorry this 'level' is not trig_mode.  Please ignore :-)

Yeah :-(  I have misread the use of "level" so, so many times in KVM's IRQ code.