Re: [PATCH v2 0/9] qemu-kvm: Clean up and enhance MSI irqchip support

[Avi Kivity <avi@redhat.com>]

On 04/27/2011 12:06 PM, Jan Kiszka wrote:
> >
> >  We can simply drop all route entries that are used exclusively in qemu
> >  (i.e. not bound to an irqfd) and let the cache rebuild itself.
>
> When should they be dropped?

Whenever we need to allocate a new routing entry, but cannot because it 
is full.

def kvm_send_msi_message(addr, val):
       gsi = route_cache.get((addr, val), None)
       if gsi is None:
           expire_volatile_route_cache_entries_if_full()
           gsi = alloc_gsi_cache_entry()
           route_cache[(addr, val)] = gsi
           update_route_cache()
        kvm_irq_line(gsi, 1)
        kvm_irq_line(gsi, 0)

The code would have to be in kvm.c, where it can track whether an entry 
is volatile or persistent.

-- 
error compiling committee.c: too many arguments to function