Re: [Xen-devel] Daily Xen Builds

[David F Barrera <dfbp@xxxxxxxxxx>]

Ian Pratt wrote:

> What happens if you don't have swiotlb=force and hammer the IO devices
> in domain 0?
>  
I am running LTP on dom0 and copied a couple of  500MB files over nfs to 
the host machine as well as some other files.  Dom0 still up.
> I can't see why creating a domU would be helped by a swiotlb.
>  
Without it, dom0 crashes. I reported on Bugzilla #168 a couple of days 
ago the following crash when creating a domU on machines built with PAE:
Fatal DMA error! Please use 'swiotlb=force'
kernel BUG at arch/xen/i386/kernel/pci-dma.c:30 (iommu_bug)!
[<c010ea0b>] iommu_bug+0x3b/0x50
[<c010eb6a>] dma_map_sg+0x14a/0x170
[<c02f5023>] ide_map_sg+0xa3/0xb0
[<c02fe86c>] ide_build_sglist+0x7c/0xd0
[<c02fe8ff>] ide_build_dmatable+0x3f/0x190
[<c02fedda>] ide_dma_setup+0x3a/0xe0
[<c0301120>] __ide_do_rw_disk+0x3d0/0x5a0
[<c02f6f00>] ide_wait_stat+0+30/0x230
[<c02837fc>] as_move_to_dispatch+0xec/0x220
[<c02f5550>] start_request+0x270/0x290
[<c02f581c>] ide_do_request+0x27c/0x470
[<c027940c>] elv_next_request+0x3c/0x1b0
[<c02f5a34>] do_ide_request+0x24/0x30
[<c027c62a>] generic_unplug_device+0x2a/0x70
[<c027c600>] generic_unplug_device+0x0/0x70
[<c02e74b6>] blkio_schedule+0x186/0x190
[<c011e070>] default_wake_function+0x0/0x20
[<c010a662>] ret_from_fork+0x6/0x14
[<c011e070>] default_wake_function+0x0/0x20
[<c02e7330>] blkio_schedule+0x0/0x190
[<c0108615>] kernel_thread_helper+0x5/0x10
Kernel panic - not syncing: BUG!

> Precisely which adaptec card is it, what driver?
>  
SCSI storage controller: Adaptec AIC-7901 U320 (rev 10)

> Thanks,
> Ian
>
>
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>
>  

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