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From: | address@hidden |
Subject: | Re: [RFC 00/18] vfio: Adopt iommufd |
Date: | Wed, 11 May 2022 22:17:25 +0800 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 |
On 2022/5/10 下午10:08, Yi Liu wrote:
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/
Thanks Yi, Do we use iommufd_hw_pagetable_from_id in kernel? The qemu send hwpt_id via ioctl. Currently VFIOIOMMUFDContainer has hwpt_list, Which member is good to save hwpt_id, IOMMUTLBEntry? In kernel ioctl: iommufd_vfio_ioctl @dev: Device to get an iommu_domain foriommufd_hw_pagetable_from_id(struct iommufd_ctx *ictx, u32 pt_id, struct device *dev)
But iommufd_vfio_ioctl seems no para dev? Thanks
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