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Re: [Qemu-devel] VFIO VGA test branches
From: |
Alex Williamson |
Subject: |
Re: [Qemu-devel] VFIO VGA test branches |
Date: |
Tue, 28 May 2013 07:53:45 -0600 |
On Tue, 2013-05-28 at 07:33 +0200, Knut Omang wrote:
>
> I noticed this warning in the host log - I suppose it is unrelated but
> thought I'd mention it just in case there is some side effect I do not
> understand here:
>
> [ 0.538124] IOMMU: Setting identity map for device 0000:00:1f.0 [0x0 -
> 0xffffff]
> [ 0.538619] PCI-DMA: Intel(R) Virtualization Technology for Directed I/O
> [ 0.538676] ------------[ cut here ]------------
> [ 0.538681] WARNING: at drivers/pci/search.c:46
> pci_find_upstream_pcie_bridge+0x58/0x80()
> [ 0.538683] Hardware name: To be filled by O.E.M.
> [ 0.538685] Modules linked in:
> [ 0.538687] Pid: 1, comm: swapper/0 Not tainted 3.9.0+ #1
> [ 0.538689] Call Trace:
> [ 0.538694] [<ffffffff8105ed2f>] warn_slowpath_common+0x7f/0xc0
> [ 0.538697] [<ffffffff8105ed8a>] warn_slowpath_null+0x1a/0x20
> [ 0.538699] [<ffffffff8132dc28>] pci_find_upstream_pcie_bridge+0x58/0x80
> [ 0.538703] [<ffffffff8152e26b>] intel_iommu_add_device+0x4b/0x1f0
> [ 0.538706] [<ffffffff81525b30>] ? bus_set_iommu+0x60/0x60
> [ 0.538708] [<ffffffff81525b63>] add_iommu_group+0x33/0x60
> [ 0.538712] [<ffffffff813f38fd>] bus_for_each_dev+0x5d/0xa0
> [ 0.538714] [<ffffffff81525b1b>] bus_set_iommu+0x4b/0x60
> [ 0.538718] [<ffffffff81d47d61>] intel_iommu_init+0xa72/0xb9a
> [ 0.538722] [<ffffffff81d0db94>] ? memblock_find_dma_reserve+0x13d/0x13d
> [ 0.538724] [<ffffffff81d0dba7>] pci_iommu_init+0x13/0x3e
> [ 0.538727] [<ffffffff8100215a>] do_one_initcall+0x12a/0x180
> [ 0.538730] [<ffffffff81d0603b>] kernel_init_freeable+0x150/0x1df
> [ 0.538732] [<ffffffff81d0588d>] ? do_early_param+0x8c/0x8c
> [ 0.538736] [<ffffffff81646580>] ? rest_init+0x80/0x80
> [ 0.538738] [<ffffffff8164658e>] kernel_init+0xe/0xf0
> [ 0.538742] [<ffffffff8166af6c>] ret_from_fork+0x7c/0xb0
> [ 0.538744] [<ffffffff81646580>] ? rest_init+0x80/0x80
> [ 0.538749] ---[ end trace f4e8b5168095f9c1 ]---
There's a bug for this:
https://bugzilla.kernel.org/show_bug.cgi?id=44881
Chances are your system includes one of the non-compliant PCIe-to-PCI
bridges that doesn't include a PCIe capability. So long as you're not
assigning anything behind that bridge, it shouldn't matter, but I think
we'll setup the wrong grouping and use the wrong source ID for devices
behind it. Thanks,
Alex
- Re: [Qemu-devel] VFIO VGA test branches, (continued)
- Re: [Qemu-devel] VFIO VGA test branches, Knut Omang, 2013/05/19
- Re: [Qemu-devel] VFIO VGA test branches, Maik Broemme, 2013/05/19
- Re: [Qemu-devel] VFIO VGA test branches, Alex Williamson, 2013/05/19
- Re: [Qemu-devel] VFIO VGA test branches, Maik Broemme, 2013/05/20
- Re: [Qemu-devel] VFIO VGA test branches, Maik Broemme, 2013/05/27
- Re: [Qemu-devel] VFIO VGA test branches, Alex Williamson, 2013/05/27
- Re: [Qemu-devel] VFIO VGA test branches, Knut Omang, 2013/05/20
- Re: [Qemu-devel] VFIO VGA test branches, Alex Williamson, 2013/05/20
- Re: [Qemu-devel] VFIO VGA test branches, Knut Omang, 2013/05/20
- Re: [Qemu-devel] VFIO VGA test branches, Knut Omang, 2013/05/28
- Re: [Qemu-devel] VFIO VGA test branches,
Alex Williamson <=
Re: [Qemu-devel] VFIO VGA test branches, Justin Gottula, 2013/05/11