From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from g2t2353.austin.hp.com ([15.217.128.52]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1XvKXT-0007pM-CD for kexec@lists.infradead.org; Mon, 01 Dec 2014 06:32:52 +0000 Message-ID: <547C0B4A.4060303@hp.com> Date: Mon, 01 Dec 2014 14:31:38 +0800 From: "Li, ZhenHua" MIME-Version: 1.0 Subject: Re: [PATCH 0/5] iommu/vt-d: Fix crash dump failure caused by legacy DMA/IO References: <1413878659-1383-1-git-send-email-zhen-hual@hp.com> <20141022100525.GD9060@dhcp-16-116.nay.redhat.com> <545ACF66.9050509@jp.fujitsu.com> <545AD061.4000102@hp.com> <545AD353.8060207@jp.fujitsu.com> <545AD8D3.90709@hp.com> <545B2885.8070009@jp.fujitsu.com> <545B2C07.1070701@hp.com> <5465A0E0.4020001@hp.com> <20141117133858.GA31920@8bytes.org> In-Reply-To: <20141117133858.GA31920@8bytes.org> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "kexec" Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: Joerg Roedel Cc: alex.williamson@redhat.com, Takao Indoh , bhe@redhat.com, tom.vaden@hp.com, dyoung@redhat.com, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, lisa.mitchell@hp.com, jerry.hoemann@hp.com, iommu@lists.linux-foundation.org, ddutile@redhat.com, doug.hatch@hp.com, ishii.hironobu@jp.fujitsu.com, linux-pci@vger.kernel.org, bhelgaas@google.com, li.zhang6@hp.com, dwmw2@infradead.org, vgoyal@redhat.com Joerg, After I implement these two steps, there comes a new fault: [1.594890] dmar: DRHD: handling fault status reg 2 [1.594894] dmar: INTR-REMAP: Request device [[41:00.0] fault index 4d [1.594894] INTR-REMAP:[fault reason 34] Present field in the IRTE entry is clear It is caused by similar reason, so I will fix it like fixing the DMAR faults: Do NOT disable and re-enable the interrupt remapping, try to use data from old kernel. Thanks Zhenhua On 11/17/2014 09:38 PM, Joerg Roedel wrote: > On Fri, Nov 14, 2014 at 02:27:44PM +0800, Li, ZhenHua wrote: >> I am working following your directions: >> >> 1. If the VT-d driver finds the IOMMU enabled, it reuses its root entry >> table, and do NOT disable-enable iommu. Other data will be copied. >> >> 2. When a device driver issues the first dma_map command for a >> device, we assign a new and empty page-table, thus removing all >> mappings from the old kernel for the device. >> >> Please let me know if I get something wrong. > > Yes, this sounds right. Happily waiting for patches :) > > > Joerg > _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec