Re: [RFC 00/18] vfio: Adopt iommufd

Yi Liu
2022-05-10T14:45:49Z

On 2022/5/10 20:45, Jason Gunthorpe wrote:
> On Tue, May 10, 2022 at 08:35:00PM +0800, Zhangfei Gao wrote:
>> Thanks Yi and Eric,
>> Then will wait for the updated iommufd kernel for the PCI MMIO region.
>>
>> Another question,
>> How to get the iommu_domain in the ioctl.
>
> The ID of the iommu_domain (called the hwpt) it should be returned by
> the vfio attach ioctl.

yes, hwpt_id is returned by the vfio attach ioctl and recorded in
qemu. You can query page table related capabilities with this id.

https://lore.kernel.org/kvm/20220414104710.28534-16-yi.l.liu@intel.com/

--
Regards,
Yi Liu