From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ingo Molnar Subject: Re: QEMU PIC indirection patch for in-kernel APIC work Date: Thu, 5 Apr 2007 12:55:40 +0200 Message-ID: <20070405105540.GA12124@elte.hu> References: <4613BF07.50606@qumranet.com> <4613C993.9020405@codemonkey.ws> <4613CC01.1090500@qumranet.com> <4613CDB2.4000903@codemonkey.ws> <4613D001.3040606@qumranet.com> <20070404200112.GA6070@elte.hu> <4614098F.2030307@us.ibm.com> <20070404212103.GA19026@elte.hu> <1175728768.12230.593.camel@localhost.localdomain> <20070405093033.GC25448@elte.hu> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org, netdev To: Rusty Russell Return-path: Content-Disposition: inline In-Reply-To: <20070405093033.GC25448-X9Un+BFzKDI@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: netdev.vger.kernel.org * Ingo Molnar wrote: > * Rusty Russell wrote: > > > It's easier to write a kernel-space network driver, but it's not > > obviously the right thing to do until we can show that an efficient > > packet-level userspace interface isn't possible. I don't think > > that's been done, and it would be interesting to try. > > yes, i agree in theory, [...] let me explain my position a bit more verbosely: i agree in terms of 'network driver' (and more generally in terms of 'device', which includes network, storage, console, etc. devices): having a user-space driver option should still be possible and it should be integrated well. Qemu is quite rich and flexible in these areas and we dont want to throw away or isolate that body of code. but i dont agree in terms of PIC code, which is the main argument in this particular thread. There's little precedent for any add-ons for PICs in user-space, nor any particular PIC handling richness in Qemu that we'd like to preserve. Ingo ------------------------------------------------------------------------- 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