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Date: Wed, 15 Apr 2015 13:47:02 +0800 From: "Li, ZhenHua" <zhen-hual@...com> To: Dave Young <dyoung@...hat.com> CC: dwmw2@...radead.org, indou.takao@...fujitsu.com, bhe@...hat.com, joro@...tes.org, vgoyal@...hat.com, iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org, kexec@...ts.infradead.org, alex.williamson@...hat.com, ddutile@...hat.com, ishii.hironobu@...fujitsu.com, bhelgaas@...gle.com, doug.hatch@...com, jerry.hoemann@...com, tom.vaden@...com, li.zhang6@...com, lisa.mitchell@...com, billsumnerlinux@...il.com, rwright@...com Subject: Re: [PATCH v10 0/10] iommu/vt-d: Fix intel vt-d faults in kdump kernel On 04/15/2015 08:57 AM, Dave Young wrote: > Again, I think it is bad to use old page table, below issues need consider: > 1) make sure old page table are reliable across crash > 2) do not allow writing oldmem after crash > > Please correct me if I'm wrong, or if above is not doable I think I will vote for > resetting pci bus. > > Thanks > Dave > Hi Dave, When updating the context tables, we have to write their address to root tables, this will cause writing to old mem. Resetting the pci bus has been discussed, please check this: http://lists.infradead.org/pipermail/kexec/2014-October/012752.html https://lkml.org/lkml/2014/10/21/890 Thanks Zhenhua -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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