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

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

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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