From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from 8bytes.org ([88.198.83.132]) by bombadil.infradead.org with esmtp (Exim 4.69 #1 (Red Hat Linux)) id 1NyLaO-0001L6-5x for kexec@lists.infradead.org; Sun, 04 Apr 2010 08:53:40 +0000 Date: Sun, 4 Apr 2010 10:53:38 +0200 From: Joerg Roedel Subject: Re: [PATCH 3/4] Revert "x86: disable IOMMUs on kernel crash" Message-ID: <20100404085338.GU24846@8bytes.org> References: <20100403012751.834020949@sous-sol.org> <20100403012820.229410717@sous-sol.org> <20100403174128.GQ24846@8bytes.org> <4BB83EAE.5090609@bwalle.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <4BB83EAE.5090609@bwalle.de> 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: Bernhard Walle Cc: nhorman@redhat.com, nhorman@tuxdriver.com, Joerg Roedel , kexec@lists.infradead.org, linux-kernel@vger.kernel.org, Chris Wright , hbabu@us.ibm.com, iommu@lists.linux-foundation.org, "Eric W. Biederman" , vgoyal@redhat.com On Sun, Apr 04, 2010 at 09:24:30AM +0200, Bernhard Walle wrote: > Am 03.04.10 19:49, schrieb Eric W. Biederman: > > Not a problem. We require a lot of things of the kdump kernel, > > and it is immediately apparent in a basic sanity test. > > Also, in most cases (for example: distribution kernels), the kdump > kernel nowadays is identical to the running kernel. So, if the running > kernel has IOMMU support, the kdump kernel also has. Yes, I know. But is that a requirement for kexec? If not we still potentially have this problem. It is a smaller problem than data-corruption caused by in-flight dma because most people^Wdistributions indeed use the same kernel for normal boot and kexec, thats true. Joerg _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec