From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Message-ID: <4C533922.10901@zytor.com> Date: Fri, 30 Jul 2010 13:42:10 -0700 From: "H. Peter Anvin" MIME-Version: 1.0 Subject: Re: In place kexec References: <4C50A7AD.8040902@zytor.com> <20100729134343.GA31490@shamino.rdu.redhat.com> <4C519853.2040206@zytor.com> <20100729150640.GF31490@shamino.rdu.redhat.com> <4C51BFA5.60507@zytor.com> <4C51C878.2090102@zytor.com> <20100729191654.GB28704@redhat.com> <20100729125535.85dfd7da.randy.dunlap@oracle.com> <4C524934.5070806@zytor.com> <1280508817.28006.0.camel@macbook.infradead.org> In-Reply-To: <1280508817.28006.0.camel@macbook.infradead.org> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: kexec-bounces@lists.infradead.org Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: David Woodhouse Cc: Randy Dunlap , Neil Horman , "kexec@lists.infradead.org" , Simon Horman , "Eric W. Biederman" , linux-driver@qlogic.com, Vivek Goyal , Andrew Vasquez On 07/30/2010 09:53 AM, David Woodhouse wrote: > On Thu, 2010-07-29 at 21:41 -0700, Eric W. Biederman wrote: >> There isn't a bus master shut off at the core level. > > Effectively, there is if you have an IOMMU. With the "core level" I meant Linux kernel code, as opposed to hardware level which is slightly different; I meant it would make sense to at least set the bus master control bit (PCI_COMMAND_MASTER) to zero before kexec. I also agree that reboot and kexec are different; the requirements for kexec are really much more strict. -hpa _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec