Re: [Xen-devel] [PATCH] VT-d: improve RMRR validity checking

[Noboru Iwamatsu <n_iwamatsu@xxxxxxxxxxxxxx>]

Weidong, Keir,

I agree your suggestions.

Noboru.

> Keir Fraser wrote:
> > On 25/01/2010 10:45, "Sander Eikelenboom" <linux@xxxxxxxxxxxxxx> wrote:
> >
> > > a) Could be discussed if panic should be default instead of disabling
> > > iommu or
> > > not, although there seem to be a lot of broken bioses, so that would
> > > lead to a
> > > lot of machines not booting.
> > Absolutely not acceptable. Warn and completely disable IOMMU is the
> > correct
> > default causing least pain to the most end users.
> >
> > -- Keir
> Agree. It should not crash Xen by default due to BIOS issues.
> warn-and-disable is better. It won't impact common Xen users, and if a
> user really wants to use VT-d, he can try iommu=workaround_bogus_bios,
> or directly report to OEM vendor to get it fixed in BIOS. As VT-d is
> used more and more widely, I think the BIOS issues will be found and
> fixed more quickly than before, thus the situation should be better.
>
> Regards,
> Weidong

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