Re: [PATCH v8 2/3] x86, apicv: add virtual interrupt delivery support

Marcelo Tosatti
2013-01-07T21:33:03Z

On Mon, Jan 07, 2013 at 07:48:43PM +0200, Gleb Natapov wrote:
> > ioapic_write (or any other ioapic update)
> > lock()
> > perform update
> > make_all_vcpus_request(KVM_REQ_UPDATE_EOI_BITMAP) (*)
> > unlock()
> >
> > (*) Similarly to TLB flush.
> >
> > The advantage is that all work becomes vcpu local. The end result
> > is much simpler code.
> What complexity will it remove?

Synchronization between multiple CPUs (except the KVM_REQ_ bit
processing, which is infrastructure shared by other parts of KVM).

We agreed that performance is non issue here.