3.9-rc1: crash kernel panic - not syncing: Can not allocate SWIOTLB buffer earlier and can't now provide you with the DMA bounce buffer

[Yinghai Lu]

On Thu, Mar 7, 2013 at 11:20 PM, WANG Chao <chaowang at redhat.com> wrote:
>>
>> looks like your system DO have DMAR table, please enable dmar
>> remapping in your kernel config.
>
> I've already got following config:
> CONFIG_DMAR_TABLE=y
> CONFIG_INTEL_IOMMU=y
> CONFIG_IRQ_REMAP=y
>
> but I don't have intel_iommu=on in kernel cmdline. IIRC, iommu will prevent
> 2nd kernel from booting ...

Did you put intel_iommu=on on first and second cpu both?

Thanks

Yinghai