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

[Takao Indoh]

(2013/03/08 16:33), WANG Chao wrote:
> On 03/08/2013 03:27 PM, Yinghai Lu wrote:
> > On Thu, Mar 7, 2013 at 11:20 PM, WANG Chao <chaowang@xxxxxxxxxx> 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?
>
> I tried, 2nd kernel didn't boot and keep splitting errors like these:
> [    2.106939] DMAR: No ATSR found
> [    2.110121] IOMMU 0 0xfed90000: using Queued invalidation
> [    2.115522] IOMMU 1 0xfed91000: using Queued invalidation
> [    2.120919] IOMMU: Setting RMRR:
> [    2.124162] IOMMU: Setting identity map for device 0000:00:02.0 [0xab800000
> - 0xaf9fffff]
> [    2.133099] IOMMU: Setting identity map for device 0000:00:1d.0 [0xaac95000
> - 0xaacb2fff]
> [    2.141305] IOMMU: Setting identity map for device 0000:00:1a.0 [0xaac95000
> - 0xaacb2fff]
> [    2.149503] IOMMU: Setting identity map for device 0000:00:14.0 [0xaac95000
> - 0xaacb2fff]
> [    2.157690] IOMMU: Prepare 0-16MiB unity mapping for LPC
> [    2.163011] IOMMU: Setting identity map for device 0000:00:1f.0 [0x0 - 0xffffff
> [Errors, here we go]
> [    2.170932] dmar: DRHD: handling fault status reg 3
> [    2.170933] PCI-DMA: Intel(R) Virtualization Technology for Directed I/O
> [    2.182486] dmar: DMAR:[DMA Write] Request device [00:02.0] fault addr ffffe000
> [    2.182486] DMAR:[fault reason 05] PTE Write access is not set
> [    2.195705] dmar: DRHD: handling fault status reg 3
> [    2.200570] dmar: DMAR:[DMA Read] Request device [00:02.0] fault addr ff873000
> [    2.200570] DMAR:[fault reason 06] PTE Read access is not set
> [    2.213618] dmar: DRHD: handling fault status reg 3
> [..]

This is the problem I'm working on.
https://lkml.org/lkml/2012/11/26/814

Thansk,
Takao Indoh

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