On Mon, Aug 13, 2012 at 01:12:46PM +0300, Michael S. Tsirkin wrote:
> On Mon, Aug 13, 2012 at 12:36:41PM +0300, Avi Kivity wrote:
> > On 08/13/2012 12:16 PM, Gleb Natapov wrote:
> > > Here is a quick prototype of what we discussed yesterday. This one
> > > caches only MSI interrupts for now. The obvious problem is that not
> > > all interrupts (namely IPIs and MSIs using KVM_CAP_SIGNAL_MSI) use irq
> > > routing table, so they cannot be cached.
> >
> > We can have a small rcu-managed hash table to look those up.
>
> Yes but how small? We probably need at least one entry
> per vcpu, no?
>
One entry? We will spend more time managing it than injecting interrupts
:) ideally we need entry for each IPI sent and for each potential MSI
from userspace. What happens when hash table is full? We stop caching or
invalidate old entries? If later then cache can go valid->invalid which
may complicate the code.
--
Gleb.
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