From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Date: Fri, 30 Jul 2010 14:34:46 -0400 From: Vivek Goyal Subject: Re: In place kexec Message-ID: <20100730183446.GC3332@redhat.com> References: <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> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: 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: "Eric W. Biederman" Cc: Randy Dunlap , Neil Horman , "kexec@lists.infradead.org" , Simon Horman , Andrew Vasquez , "H. Peter Anvin" , linux-driver@qlogic.com, David Woodhouse On Fri, Jul 30, 2010 at 11:21:42AM -0700, Eric W. Biederman wrote: > David Woodhouse writes: > > > 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. > > Depends on the IOMMU. There are several dinky IOMMUs that when you > shut them off DMA simply goes around them, and is not stopped. I think last time we were discussing this for AMD IOMMU where if you disable IOMMU, it just kind of become pass through with 1:1 mapping of addresses. Vivek _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec