RE: [PATCH v3 0/6] intel_iommu: Enable PRQ support for passthrough device

Hi Clement,

>-----Original Message-----
>From: Clément MATHIEU--DRIF <[email protected]>
>Subject: Re: [PATCH v3 0/6] intel_iommu: Enable PRQ support for passthrough
>device
>
>Hi Zhenzhong,
>
>I will read this series early next week.
>thanks for the respin!
>
>btw, related to this work: have ever seen
>vfio_device_get_aw_bits returning 47 whereas
>the iommu supports 48? This leads the following
>aw test to fail:
>
>```
>ret = hiodc->get_cap(hiod, HOST_IOMMU_DEVICE_CAP_AW_BITS, errp);
>if (ret < 0) {
>    return false;
>}
>if (s->aw_bits > ret) {
>    error_setg(errp, "aw-bits %d > host aw-bits %d", s->aw_bits, ret);
>    return false;
>}
>```
>
>I got this when trying to nest VMs.

I am trying to reproduce, what device did you passthrough?

Thanks
Zhenzhong