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From: Dave Young <dyoung@redhat.com>
To: "Li, Zhen-Hua" <zhen-hual@hp.com>
Cc: alex.williamson@redhat.com, indou.takao@jp.fujitsu.com,
	bhe@redhat.com, tom.vaden@hp.com, rwright@hp.com,
	linux-pci@vger.kernel.org, joro@8bytes.org,
	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,
	bhelgaas@google.com, billsumnerlinux@gmail.com, li.zhang6@hp.com,
	dwmw2@infradead.org, vgoyal@redhat.com
Subject: Re: [PATCH v9 0/10] iommu/vt-d: Fix intel vt-d faults in kdump kernel
Date: Fri, 3 Apr 2015 16:40:31 +0800	[thread overview]
Message-ID: <20150403084031.GF22579@dhcp-128-53.nay.redhat.com> (raw)
In-Reply-To: <1426743388-26908-1-git-send-email-zhen-hual@hp.com>

> To fix this problem, we modifies the behaviors of the intel vt-d in the 
> crashdump kernel:
> 
> For DMA Remapping:
> 1. To accept the vt-d hardware in an active state,
> 2. Do not disable and re-enable the translation, keep it enabled.
> 3. Use the old root entry table, do not rewrite the RTA register.
> 4. Malloc and use new context entry table, copy data from the old ones that
>    used by the old kernel.

Have not read all the patches, but I have a question, not sure this has been
answered before. Old memory is not reliable, what if the old memory get corrupted
before panic? Is it safe to continue using it in 2nd kernel, I worry that it will
cause problems.

Hope I'm wrong though.

Thanks
Dave



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  parent reply	other threads:[~2015-04-03  8:41 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-19  5:36 [PATCH v9 0/10] iommu/vt-d: Fix intel vt-d faults in kdump kernel Li, Zhen-Hua
2015-03-19  5:36 ` [PATCH v9 01/10] iommu/vt-d: New function to attach domain with id Li, Zhen-Hua
2015-03-19  5:36 ` [PATCH v9 02/10] iommu/vt-d: Items required for kdump Li, Zhen-Hua
2015-03-19  5:36 ` [PATCH v9 03/10] iommu/vt-d: Function to get old context entry Li, Zhen-Hua
2015-03-19  5:36 ` [PATCH v9 04/10] iommu/vt-d: functions to copy data from old mem Li, Zhen-Hua
2015-03-19  5:36 ` [PATCH v9 05/10] iommu/vt-d: Add functions to load and save old re Li, Zhen-Hua
2015-03-19  5:36 ` [PATCH v9 06/10] iommu/vt-d: datatypes and functions used for kdump Li, Zhen-Hua
2015-03-19  5:36 ` [PATCH v9 07/10] iommu/vt-d: enable kdump support in iommu module Li, Zhen-Hua
     [not found]   ` <20150402110608.GL4441@8bytes.org>
2015-04-03  7:45     ` Li, ZhenHua
2015-03-19  5:36 ` [PATCH v9 08/10] iommu/vt-d: assign new page table for dma_map Li, Zhen-Hua
2015-03-19  5:36 ` [PATCH v9 09/10] iommu/vt-d: Copy functions for irte Li, Zhen-Hua
2015-03-19  5:36 ` [PATCH v9 10/10] iommu/vt-d: Use old irte in kdump kernel Li, Zhen-Hua
     [not found] ` <20150402111133.GM4441@8bytes.org>
2015-04-03  7:54   ` [PATCH v9 0/10] iommu/vt-d: Fix intel vt-d faults " Li, ZhenHua
2015-04-03  8:28 ` Dave Young
2015-04-03  8:31   ` Li, ZhenHua
2015-04-03  8:40 ` Dave Young [this message]
2015-04-03  9:01   ` Li, ZhenHua
2015-04-03  9:21     ` Dave Young
2015-04-03 14:05       ` Li, Zhen-Hua
2015-04-07  3:49         ` Dave Young
2015-04-05  1:54       ` Baoquan He
2015-04-07  3:46         ` Dave Young
2015-04-07  9:08           ` Dave Young
2015-04-07  9:55             ` Li, ZhenHua
2015-04-08  3:33               ` Dave Young
2015-04-07 14:12           ` Don Dutile
2015-05-07 14:00             ` Dave Young
2015-05-07 14:25               ` Don Dutile
2015-05-08  1:21                 ` Dave Young
2015-05-10 21:37                   ` Don Dutile
2015-05-10 21:31               ` Don Dutile
     [not found]   ` <20150504110551.GD15736@8bytes.org>
2015-05-04 15:21     ` Don Dutile
2015-05-05  6:09     ` Dave Young
     [not found]       ` <20150505152343.GP15736@8bytes.org>
2015-05-06  1:46         ` Dave Young
     [not found]           ` <20150506081617.GB20611@8bytes.org>
2015-05-07 13:25             ` Dave Young
2015-05-07 13:56     ` Dave Young
     [not found]       ` <20150511101124.GG20611@8bytes.org>
2015-05-12  5:57         ` Dave Young
2015-05-12  6:41           ` Dave Young

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