RE: [PATCH v4 5/5] vfio: Support IO page table replacement

[Tian, Kevin]

> From: Nicolin Chen <nicolinc@xxxxxxxxxx>
> Sent: Saturday, March 11, 2023 7:38 AM
> 
> On Fri, Mar 10, 2023 at 11:53:56AM +0000, Tian, Kevin wrote:
> > External email: Use caution opening links or attachments
> >
> >
> > > From: Nicolin Chen <nicolinc@xxxxxxxxxx>
> > > Sent: Wednesday, March 8, 2023 10:26 PM
> > >
> > > Now both the physical path and the emulated path should support an IO
> > > page
> > > table replacement.
> > >
> > > Call iommufd_device_replace() when vdev->iommufd_attached is true.
> > >
> >
> > why is replace enabled only in physical path in this patch?
> 
> The emulated pathway does not call iommufd_device_attach() but
> iommufd_access_set_ioas() in the other patch, which internally
> takes care of the replacement for the access pointer.
> 

I thought there is a similar check as in physical path which should
be removed:

	if (vdev->iommufd_attached)
-		return -EBUSY;

but looks it's not the case for the emulated path.