[vfio-users] issues about igd-passthrough using vfio-pci

[Alex Williamson]

On Wed, Sep 14, 2016 at 3:02 AM, fulaiyang <fulaiyang at 163.com> wrote:

> Hi Alex,
>  The DMAR show that  '*DMAR:[fault reason 02] Present bit in context
> entry is clear*'. I read from a book,it shows that DMA data transmission
> of IGD device is invalid. That is to say,GPA can't convert to HPA. Could
> I confirm that my GPU platform has some problems?
>

As noted in the documentation, this is not unexpected for IGD assignment:

http://git.qemu.org/?p=qemu.git;a=blob;f=docs/igd-assign.txt

So long as it coincides with VM startup and does not persist, it's likely
normal.
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