Re: Device assignment, shared IRQs, uio_pci_generic

[Jan Kiszka <jan.kiszka@web.de>]

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Am 31.10.2010 16:05, Jan Kiszka wrote:
> Still not working here are ehci, ath9k and e1000e when passed through.
> They receive IRQs, but somehow the Linux guest drivers are unhappy about
> the device states (the e1000e detects "Hardware Unit Hang" e.g.). This
> is independent of my patches. Anyone any ideas? Improper configurations
> of the BIOS? I stumbled over this in the kernel log:
> 
>     DMAR: BIOS has allocated no shadow GTT; disabling IOMMU for graphics
> 

Argh, no one told me that there is CONFIG_DMAR_DEFAULT_ON and that you
have to pass "intel_iommu=on" if that config switch is off like here.
Moreover, I somehow assumed "iommu=0" on the command line means "use
IOMMU with index 0" (don't ask me why). Usability deserves some patches
- later.

So it's starting to work, already accessed some devices (ath9k did a
successful scan), but now it's crashing in intel_iommu_attach_device.
Looks like use after release. Sigh.

Jan


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