Re: [PATCH v5 3/9] mshv: Introduce basic mshv bridge device for VFIO to build upon

[Jason Gunthorpe]

On Thu, Sep 03, 2026 at 11:46:47AM -0700, Jacob Pan wrote:
> Hi Jason,
> 
> On Thu, 3 Sep 2026 14:40:14 -0300
> Jason Gunthorpe <jgg@xxxxxxxxxx> wrote:
> 
> > On Thu, Sep 03, 2026 at 09:13:28AM -0700, Wei Liu wrote:
> > > > Does mshv use KVM at all? Can a kvm fd describe the partition?  
> > > 
> > > No. MSHV doesn't use KVM. We don't have a kvm fd. We have an mshv
> > > fd to describe the partition. They are different virtualization
> > > solutions.
> > > 
> > > In the ideal world, the fd should be hypervisor agnostic, not tied
> > > to kvm.  
> > 
> > There is a patch generalizing vfio to work on FDs instead of KVM
> > structures:
> > 
> >  https://patch.msgid.link/20260903-vfio-v2-1-ef4cd4190ae7@xxxxxxxxxxxxx 
> > 
> > That's probably a good step long that line.
> Yeah, ideally, it would be removing/rename device/group->kvm to
> something like group/device->vm_file?

Maybe it could? Do you need the file in VFIO land or is what you
showed in the other message OK?

I think it should be broadly fine to pass in the file that way and
hold a reference on it in the viommu object..

Jason