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

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 21/01/2010 12:46, "Weidong Han" <weidong.han@xxxxxxxxx> wrote:

>> If DRHD does not have existent devices, ignore it.
>> If DRHD has both existent and non-existent devices, consider it invalid
>> and not register.
>>   
> 
> Although you patch workarounds your buggy BIOS, but we still need to
> enable it for security purpose as I mentioned in previous mail. We
> needn't workaround / fix all BIOS issues in software. I think security
> is more important for this specific BIOS issue. Did you report the BIOS
> issue to your OEM vendor? maybe it's better to get it fixed in BIOS.

If VT-d cannot be correctly enabled on a particualr system, should we not
warn-and-disable (partially disable or completely disable) rather than fail
to boot? If we want to fail to boot, that is what the iommu=force option is
there for.

 -- Keir



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