From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hollis Blanchard Subject: Re: [kvm-ppc-devel] [PATCH 1 of 3] Move x86 kvmcallback structure to kvmctl-x86.h header Date: Sun, 28 Oct 2007 23:14:42 -0500 Message-ID: <1193631282.17368.63.camel@basalt> References: <3bf072e498768885ab96.1193618567@thinkpad> <4725415B.4020601@codemonkey.ws> <1193627660.17368.55.camel@basalt> <47255892.2090308@codemonkey.ws> Reply-To: Hollis Blanchard Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org, kvm-ppc-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org, Jerone Young To: Anthony Liguori Return-path: In-Reply-To: <47255892.2090308-rdkfGonbjUSkNkDKm+mE6A@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 On Sun, 2007-10-28 at 22:50 -0500, Anthony Liguori wrote: > > You could certainly get even more clever and have the arch backend > register the appropriate tables based on the as type but that's merely > an implementation detail. The key observation, that I believe is > correct, is that all architectures have one or more IO "address > spaces" that have at max a 64-bit address space and support at max > 64-bit input/output operations. Once that assumption is made, almost > all IO code becomes common. Just FYI, some PowerPC have "load/store quad", which are 128-bit memory accesses. For that matter, I suppose one could do IO loads into Altivec registers (which are also 128 bits), though that sounds like an extreme case. I wonder if the same is true for x86 vector registers. Also, can't x86 "rep" instructions go beyond 64 bits? I guess that must be handled in the arch-specific caller of io_write(), which would call it multiple times. -- Hollis Blanchard IBM Linux Technology Center ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/