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[Xen-devel] Re: 2.6.38 (FC15) with PCI passthrough fails mysteriously with iommu=soft..

On 06/01/11 20:13, Konrad Rzeszutek Wilk wrote:

> It probably was panicing b/c it couldn't swizzle out 64MB
> of DMA32 memory. You can find that out if you do 'earlyprintk=xenboot' and
> that should print out the bootlog in your Xen debug console (if you have
> configured guest_loglvl=all).

That seems to be it.

[52124.668662] Kernel panic - not syncing: DMA(-12): Failed to exchange pages 
allocated for DMA with Xen! We either don't have the permission or you do not 
have enoughfree memory under 4GB!
[52124.668677] Pid: 0, comm: swapper Not tainted #1
[52124.668681] Call Trace:
[52124.668691]  [<ffffffff8146c72c>] panic+0x91/0x19c
[52124.668698]  [<ffffffff81006c3f>] ? xen_restore_fl_direct_end+0x0/0x1
[52124.668704]  [<ffffffff81b8f8e6>] xen_swiotlb_init+0xf9/0x131
[52124.668711]  [<ffffffff81b6a040>] ? pci_swiotlb_late_init+0x0/0x29
[52124.668717]  [<ffffffff8147dfae>] ? _etext+0x0/0x2
[52124.668724]  [<ffffffff81b5d6d1>] pci_xen_swiotlb_init+0x17/0x29
[52124.668730]  [<ffffffff81b5fe00>] pci_iommu_alloc+0x57/0x6e
[52124.668736]  [<ffffffff81b6db7e>] mem_init+0x19/0xec
[52124.668741]  [<ffffffff81b58a3d>] start_kernel+0x200/0x3fe
[52124.668746]  [<ffffffff81b582c4>] x86_64_start_reservations+0xaf/0xb3
[52124.668752]  [<ffffffff81b5bd1b>] xen_start_kernel+0x59c/0x5a3


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