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Re: [Xen-devel] Critical bug: VT-d fault causes disk corruption orDom0 k

To: Akio Takebe <takebe_akio@xxxxxxxxxxxxxx>, "Li, Xin" <xin.li@xxxxxxxxx>, "Li, Haicheng" <haicheng.li@xxxxxxxxx>, "'xen-devel@xxxxxxxxxxxxxxxxxxx'" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] Critical bug: VT-d fault causes disk corruption orDom0 kernel panic.
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Thu, 22 Jan 2009 09:47:45 +0000
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On 22/01/2009 09:40, "Akio Takebe" <takebe_akio@xxxxxxxxxxxxxx> wrote:

> Is compute_dom0_nr_pages() OK?
> The number of available pages seems to be increase.
> What do you think?

Now that the heaps are unified, the old Xen heap pages are visible to dom0
and available to be allocated. Is this a problem? Probably not since we
already by default prevent dom0 from allocating all memory up front. There
are similar concerns regarding the auto-ballooner by the way, which are more
likely to need addressing. If you run with dom0_mem= and no auto-ballooner
then there is no worry at all.

Btw these concerns should have nothing to do with the reported VT-d faults.

 -- Keir



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