linux-kernel - Re: 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

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Date:	Thu, 7 Mar 2013 23:27:12 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	WANG Chao <chaowang@...hat.com>
Cc:	CAI Qian <caiqian@...hat.com>, LKML <linux-kernel@...r.kernel.org>,
	kexec <kexec@...ts.infradead.org>,
	Dave Young <dyoung@...hat.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	"H. Peter Anvin" <hpa@...ux.intel.com>
Subject: Re: 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

On Thu, Mar 7, 2013 at 11:20 PM, WANG Chao <chaowang@...hat.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
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