From: David Woodhouse <dwmw2@infradead.org>
To: Don Dutile <ddutile@redhat.com>
Cc: indou.takao@jp.fujitsu.com, bhe@redhat.com,
linux-pci@vger.kernel.org, joro@8bytes.org,
kexec@lists.infradead.org, alex.williamson@redhat.com,
linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org,
doug.hatch@hp.com, ishii.hironobu@jp.fujitsu.com,
bhelgaas@google.com, zhenhua@hp.com,
Bill Sumner <bill.sumner@hp.com>
Subject: Re: [PATCHv3 0/6] Crashdump Accepting Active IOMMU
Date: Tue, 08 Apr 2014 17:14:46 +0100 [thread overview]
Message-ID: <1396973686.25235.36.camel@i7.infradead.org> (raw)
In-Reply-To: <53430DE9.9080303@redhat.com>
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On Mon, 2014-04-07 at 16:43 -0400, Don Dutile wrote:
>
> Additionally, a tidbit of information like "some servers force NMI's
> on DMAR faults,
> and cause a system reset, thereby, preventing a kdump to occur"
> should have been included as one reason to stop DMAR faults from
> occurring on kexec-boot,
> in addition to the fact that a flood of them can lock up a system.
How about allocating a physical scratch page, and setting up a mapping
for each device such that *every* virtual address (apart from those
listed in RMRRs, perhaps) is mapped to that same scratch page?
That way you avoid the faults, but you also avoid stray DMA to parts of
the system that you don't want to get corrupted.
--
David Woodhouse Open Source Technology Centre
David.Woodhouse@intel.com Intel Corporation
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next prev parent reply other threads:[~2014-04-08 16:14 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-10 22:07 [PATCHv3 0/6] Crashdump Accepting Active IOMMU Bill Sumner
2014-01-10 22:07 ` [PATCHv3 1/6] Crashdump-Accepting-Active-IOMMU-Flags-and-Prototype Bill Sumner
2014-01-10 22:07 ` [PATCHv3 2/6] Crashdump-Accepting-Active-IOMMU-Utility-functions Bill Sumner
2014-01-10 22:07 ` [PATCHv3 3/6] Crashdump-Accepting-Active-IOMMU-Domain-Interfaces Bill Sumner
2014-03-04 14:59 ` Joerg Roedel
2014-03-10 19:23 ` Sumner, William
2014-01-10 22:07 ` [PATCHv3 4/6] Crashdump-Accepting-Active-IOMMU-Copy-Translations Bill Sumner
2014-01-10 22:07 ` [PATCHv3 5/6] Crashdump-Accepting-Active-IOMMU-Debug-Print-IOMMU Bill Sumner
2014-01-10 22:07 ` [PATCHv3 6/6] Crashdump-Accepting-Active-IOMMU-Call-From-Mainline Bill Sumner
2014-01-25 2:44 ` [PATCHv3 0/6] Crashdump Accepting Active IOMMU Baoquan He
2014-03-04 15:06 ` Joerg Roedel
2014-03-10 19:10 ` Sumner, William
2014-03-10 21:43 ` Vivek Goyal
2014-04-07 20:43 ` Don Dutile
2014-04-08 16:14 ` David Woodhouse [this message]
2014-04-08 18:42 ` Don Dutile
2014-04-25 18:11 ` Sumner, William
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