Re: [RFC PATCH 0/2] irq destination caching prototype

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On Mon, Aug 13, 2012 at 12:34:32PM +0300, Michael S. Tsirkin wrote:
> On Mon, Aug 13, 2012 at 12:16:46PM +0300, 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.
> 
> I thought this means ID changes need to replace the routing table, no?
> 
Correct. This is missing from the patches, but as I said this is just
prototype to see if it is feasible. What this prototype shows is that we
have problems with IPIs and MSIs from userspace.

> > 
> > Gleb Natapov (2):
> >   Call irq_rt callback under rcu_read_lock()
> >   Cache msi irq destination.
> > 
> >  arch/x86/kvm/lapic.c     |    2 +-
> >  include/linux/kvm_host.h |    1 +
> >  virt/kvm/ioapic.c        |    2 +-
> >  virt/kvm/ioapic.h        |    3 ++-
> >  virt/kvm/irq_comm.c      |   37 ++++++++++++++++++++-----------------
> >  5 files changed, 25 insertions(+), 20 deletions(-)
> > 
> > -- 
> > 1.7.10.4

--
			Gleb.
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