Re: [PATCH v3 3/4] vfio: Add VFIO_DEVICE_PASID_[AT|DE]TACH_IOMMUFD_PT

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On 2024/10/1 20:11, Jason Gunthorpe wrote:
On Mon, Sep 30, 2024 at 07:55:08AM +0000, Tian, Kevin wrote:

+struct vfio_device_pasid_attach_iommufd_pt {
+	__u32	argsz;
+	__u32	flags;
+	__u32	pasid;
+	__u32	pt_id;
+};
+
+#define VFIO_DEVICE_PASID_ATTACH_IOMMUFD_PT	_IO(VFIO_TYPE,
VFIO_BASE + 21)

Not sure whether this was discussed before. Does it make sense
to reuse the existing VFIO_DEVICE_ATTACH_IOMMUFD_PT
by introducing a new pasid field and a new flag bit?

Maybe? I don't have a strong feeling either way.

There is somewhat less code if you reuse the ioctl at least

I had a rough memory that I was suggested to add a separate ioctl for
PASID. Let's see Alex's opinion.

@Alex.

--
Regards,
Yi Liu




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