From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-qa0-f49.google.com ([209.85.216.49]) by merlin.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1TCcHP-0004Rj-6H for kexec@lists.infradead.org; Fri, 14 Sep 2012 20:14:24 +0000 Received: by qafk1 with SMTP id k1so173122qaf.15 for ; Fri, 14 Sep 2012 13:14:20 -0700 (PDT) Date: Fri, 14 Sep 2012 16:03:36 -0400 From: Konrad Rzeszutek Wilk Subject: Re: [RFC][PATCH] Reset PCIe devices to address DMA problem on kdump with iommu Message-ID: <20120914200334.GA9041@phenom.dumpdata.com> References: <501BB4EF.7080909@jp.fujitsu.com> <20120803114643.GA28330@redhat.com> <501F4877.5050605@jp.fujitsu.com> <20120806203902.GH25559@redhat.com> <50473306.1070803@jp.fujitsu.com> <20120910143604.GB639@redhat.com> <504F1343.7030607@jp.fujitsu.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <504F1343.7030607@jp.fujitsu.com> 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: Takao Indoh Cc: martin.wilck@ts.fujitsu.com, linux-pci@vger.kernel.org, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, hbabu@us.ibm.com, ishii.hironobu@jp.fujitsu.com, bhelgaas@google.com, vgoyal@redhat.com > As to the boot parameter to enable this function, you suggested using > reset_devices. I found that on a certain platform resetting devices > caused PCIe error due to a hardware bug. Therefore I think we need > new parameter apart from reset_devices to disable this function on > such a machine. Wouldn't a DMI quirk be better for this? That way the second kernel internally would know not to do this. _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec