From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Date: Fri, 14 Sep 2012 16:03:36 -0400 From: Konrad Rzeszutek Wilk To: Takao Indoh Cc: vgoyal@redhat.com, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, bhelgaas@google.com, hbabu@us.ibm.com, ishii.hironobu@jp.fujitsu.com, martin.wilck@ts.fujitsu.com 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-Type: text/plain; charset=us-ascii In-Reply-To: <504F1343.7030607@jp.fujitsu.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: > 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.