Re: issues with emulated PCI MMIO backed by host memory under KVM

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On 27 June 2016 at 10:47, Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx> wrote:
> As for the USB case, I can't really figure out what is going on here,
> but I am fairly certain it is a different issue. If this is related to
> DMA, I wonder if adding the 'dma-coherent' property to the PCIe root
> complex node fixes anything.

I get the impression dma-coherent is the right thing to advertise
anyway. Do you have the documentation to hand that specifies what
"dma-coherent" means? The Documentation/devicetree docs in the
kernel tree seem to rather unhelpfully define it as "Present if
dma operations are coherent", which doesn't really clarify anything
to me...

thanks
-- PMM
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