From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: [PATCH] interrupt preemption support Date: Mon, 19 Mar 2007 16:03:19 +0200 Message-ID: <45FE9827.5030200@qumranet.com> References: <45F97019.BA47.005A.0@novell.com> <45FA414C.1040703@qumranet.com> <45FA4489.BA47.005A.0@novell.com> <45FCD226.2010603@qumranet.com> <45FE4FB1.BA47.005A.0@novell.com> <45FE9793.3060204@qumranet.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org To: Gregory Haskins Return-path: In-Reply-To: <45FE9793.3060204-atKUWr5tajBWk0Htik3J/w@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: kvm.vger.kernel.org Avi Kivity wrote: > Gregory Haskins wrote: >> Hi Avi, >> You make good points. I will convert to a nest lock design and >> resubmit. Should I use two mutexes, or a mutex and spinlock? >> >> Also, do you have any suggestions on the signum I should use to IPI >> the running guest? Should I use one of the normal signals (SIGUSR) >> or should I start a block of defined signals in the RT range (>32)? >> > > For a short term solution, where the apic is in userspace, we can just > say ipi == signal, and not require any locking. Qemu will catch the > signal and call the appropriate apic function. The signal number > should be set from userspace. > Note that as long as the apic code is in userspace, the sending side is also in userspace, so all the IPI related stuff doesn't touch the kernel. -- error compiling committee.c: too many arguments to function ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV