On Thu, Nov 18, 2010 at 03:48:43PM +0200, Michael S. Tsirkin wrote:
> On Thu, Nov 18, 2010 at 03:35:01PM +0200, Gleb Natapov wrote:
> > On Thu, Nov 18, 2010 at 03:20:27PM +0200, Michael S. Tsirkin wrote:
> > > On Thu, Nov 18, 2010 at 03:14:53PM +0200, Gleb Natapov wrote:
> > > > On Thu, Nov 18, 2010 at 03:03:37PM +0200, Michael S. Tsirkin wrote:
> > > > > > >+static inline void kvm_irq_routing_update(struct kvm *kvm,
> > > > > > >+ struct kvm_irq_routing_table *irq_rt)
> > > > > > >+{
> > > > > > >+ rcu_assign_pointer(kvm->irq_routing, irq_rt);
> > > > > > >+}
> > > > > > >+
> > > > > > > static inline int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
> > > > > > > {
> > > > > > > return -ENOSYS;
> > > > > >
> > > > > > Apart from these minor issues, looks good.
> > > > >
> > > > >
> > > > > Something we should consider improving is the loop over all VCPUs that
> > > > > kvm_irq_delivery_to_apic invokes. I think that (for non-broadcast
> > > > > interrupts) it should be possible to precompute an store the CPU
> > > > > in question as part of the routing entry.
> > > > >
> > > > > Something for a separate patch ... comments?
> > > > >
> > > > I do not think this info should be part of routing entry. Routing entry
> > > > is more about describing wires on the board.
> > >
> > > Not for msi. kvm_kernel_irq_routing_entry seems to just keep an
> > > address/data pair in that case. So
> > >
> > Yeah. Using routing_entry for MSI was miss design. We discussed that too :)
> >
> > > union {
> > > struct {
> > > unsigned irqchip;
> > > unsigned pin;
> > > } irqchip;
> > > struct msi_msg msi;
> > > };
> > >
> > > would become
> > >
> > > union {
> > > struct {
> > > unsigned irqchip;
> > > unsigned pin;
> > > } irqchip;
> > > struct {
> > > struct msi_msg msi;
> > > struct kvm_vpcu *dest;
> > > } msi;
> > > };
> > >
> > > or something like this.
> > Ah so you want to do it only for MSI? For MSI it makes sense. Remember
> > though that sometimes destination depend on message itself (specifically
> > on delivery mode).
>
> Of course. We'll take message/data and precompute destination.
> Set to NULL for e.g. broadcast and recompute at injection time
> in that case. BTW SELF doesn't work for MSI at the moment, not sure
> whether it's relevant or when is it used.
>
Yes, only lowest prio is defined for MSI. Self or all but self has
not meaning for MSI.
--
Gleb.
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