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

[Weidong Han <weidong.han@xxxxxxxxx>]

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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