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Re: [Xen-devel] Re: IOMMU faults

To: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Subject: Re: [Xen-devel] Re: IOMMU faults
From: Tim Deegan <Tim.Deegan@xxxxxxxxxx>
Date: Fri, 17 Jun 2011 09:08:36 +0100
Cc: Wei Wang2 <wei.wang2@xxxxxxx>, Jean, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Allen Kay <allen.m.kay@xxxxxxxxx>, Guyader <Jean.Guyader@xxxxxxxxxx>
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At 10:47 -0400 on 16 Jun (1308221250), Konrad Rzeszutek Wilk wrote:
> Perhaps make something similar to the MCE fault interrupts? As in when
> the error happens, the Dom0 is notified of the offending BDF and
> persuses whatever action it thinks are neccessary. The action would be
> to tell the device driver to turn itself off. But how it would
> interact with the driver.. Well how does Linux deal with this today?
> Is there an extension to the device driver API (similar to the power)
> to notify the driver that it has done bad things and to shut itself
> off?

That sort of interface might be nice too, but I was worried more about
badly-behaved guests or devices.  In the livelock case the guest might
never get to run so can't do anything, and a malicious guest would just
ignore the message anyway.


Tim Deegan <Tim.Deegan@xxxxxxxxxx>
Principal Software Engineer, Xen Platform Team
Citrix Systems UK Ltd.  (Company #02937203, SL9 0BG)

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