Re: [PATCH v7 00/16] vfio: expose virtual Shared Virtual Addressing to VMs

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On Wed, Sep 16, 2020 at 12:07:54PM -0300, Jason Gunthorpe wrote:
> On Tue, Sep 15, 2020 at 05:22:26PM -0700, Jacob Pan (Jun) wrote:
> > > If user space wants to bind page tables, create the PASID with
> > > /dev/sva, use ioctls there to setup the page table the way it wants,
> > > then pass the now configured PASID to a driver that can use it. 
> > 
> > Are we talking about bare metal SVA? 
> 
> What a weird term.

Glad you noticed it at v7 :-) 

Any suggestions on something less weird than 
Shared Virtual Addressing? There is a reason why we moved from SVM to SVA.
> 
> > If so, I don't see the need for userspace to know there is a
> > PASID. All user space need is that my current mm is bound to a
> > device by the driver. So it can be a one-step process for user
> > instead of two.
> 
> You've missed the entire point of the conversation, VDPA already needs
> more than "my current mm is bound to a device"

You mean current version of vDPA? or a potential future version of vDPA?

Cheers,
Ashok



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