From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Michael S. Tsirkin" Subject: Re: [RFC PATCH 0/2] irq destination caching prototype Date: Mon, 13 Aug 2012 12:34:32 +0300 Message-ID: <20120813093432.GL14081@redhat.com> References: <1344849408-2697-1-git-send-email-gleb@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: kvm@vger.kernel.org, avi@redhat.com To: Gleb Natapov Return-path: Received: from mx1.redhat.com ([209.132.183.28]:8978 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751256Ab2HMJd1 (ORCPT ); Mon, 13 Aug 2012 05:33:27 -0400 Received: from int-mx12.intmail.prod.int.phx2.redhat.com (int-mx12.intmail.prod.int.phx2.redhat.com [10.5.11.25]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id q7D9XRO8007535 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Mon, 13 Aug 2012 05:33:27 -0400 Content-Disposition: inline In-Reply-To: <1344849408-2697-1-git-send-email-gleb@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: 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? > > 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