From mboxrd@z Thu Jan  1 00:00:00 1970
From: David F Barrera <dfbp@us.ibm.com>
Subject: Re: Daily Xen Builds
Date: Thu, 18 Aug 2005 16:58:59 -0500
Message-ID: <430504A3.5050100@us.ibm.com>
References: <A95E2296287EAD4EB592B5DEEFCE0E9D282BED@liverpoolst.ad.cl.cam.ac.uk>
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To: Ian Pratt <m+Ian.Pratt@cl.cam.ac.uk>
Cc: Li Ge <lge@us.ibm.com>, xen-devel@lists.xensource.com, xen-devel-bounces@lists.xensource.com
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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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