Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752671Ab2FKKB7 (ORCPT ); Mon, 11 Jun 2012 06:01:59 -0400 Received: from mx1.redhat.com ([209.132.183.28]:46258 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750991Ab2FKKB5 (ORCPT ); Mon, 11 Jun 2012 06:01:57 -0400 Message-ID: <4FD5C205.5070901@redhat.com> Date: Mon, 11 Jun 2012 13:01:41 +0300 From: Avi Kivity User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:12.0) Gecko/20120430 Thunderbird/12.0.1 MIME-Version: 1.0 To: Jan Kiszka CC: "Michael S. Tsirkin" , Thomas Gleixner , Alex Williamson , "kvm@vger.kernel.org" , "mtosatti@redhat.com" , "linux-kernel@vger.kernel.org" , "yongjie.ren@intel.com" Subject: Re: [PATCH] KVM: Use IRQF_ONESHOT for assigned device MSI interrupts References: <20120601161521.26935.25606.stgit@bling.home> <4FC8F042.5050600@siemens.com> <1338570192.23475.25.camel@bling.home> <4FC8F867.7080103@siemens.com> <1338573558.23475.41.camel@bling.home> <4FC90961.8030701@siemens.com> <4FCB2359.9020505@redhat.com> <4FCC9EAC.9090007@siemens.com> <20120608143927.GA4949@redhat.com> <4FD21151.9090608@siemens.com> In-Reply-To: <4FD21151.9090608@siemens.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 868 Lines: 23 On 06/08/2012 05:50 PM, Jan Kiszka wrote: > >> >> Pls correct me if I'm wrong. > > Well, IIRC, the "don't loop over all vcpus with IRQs or preemption > disabled" was one argument against direct legacy interrupt injection as > well. That's what I kept in mind from those discussions. Maybe Avi can > comment on the current position. It's still my position. IMO we need something like struct gfn_to_hva_cache for interrupts. If it's in the cache, we fast-path it from the interrupt handler. If not, fall back to a workqueue and let it refill the cache. -- error compiling committee.c: too many arguments to function -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/