Unable to set coherent dma mask: disabling DMA

[donoban]

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Hi

I noticed this messages on Qubes 3.2, I don't know if they also
appeared on Qubes 3.1.

parport_pc.956: Unable to set coherent dma mask: disabling DMA
parport_pc.888: Unable to set coherent dma mask: disabling DMA
parport_pc.632: Unable to set coherent dma mask: disabling DMA


Any idea?

Regards.
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[raah...@gmail.com]

I get the same exact messages on boot I noticed. and right before that during boot I get

Kernel: Error: Driver 'processor_aggregator' is already registered, aborting...

Also in journalctl I get dom0 Kernel: pnp 00:05: [dma 0 disabled]
dom0 Kernel: pnp 00:06: [dma 0 disabled]

Does this mean iommu is not working right? I don't notice any problems with qubes.

[Marek Marczykowski-Górecki]

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Most likely DMA handling for this particular device (whatever it is) is
incompatible with Xen. If you don't observe any negative effects,
nothing to worry about.

- --
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?

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[raah...@gmail.com]

tks