# RE: \[PATCH 15/17\] iommu: remove DOMAIN\_ATTR\_NESTING

- From: Tian, Kevin \<kevin.tian@intel.com\>
- Date: 2021-03-25 06:13:55 
- List: netdev
- Page: https://ratatoskr.run/netdev/2021/03/8286139
- Thread: https://ratatoskr.run/kvm/2021/03/8285616/t.md

```text
> From: Auger Eric
> Sent: Monday, March 15, 2021 3:52 PM
> To: Christoph Hellwig <hch@lst.de>
> Cc: <redacted>; Will Deacon <will@kernel.org>; linuxppc-
> dev@lists.ozlabs.org; dri-devel@lists.freedesktop.org; Li Yang
> [ref]; iommu@lists.linux-foundation.org;
> 
> Hi Christoph,
> 
> On 3/14/21 4:58 PM, Christoph Hellwig wrote:
> > On Sun, Mar 14, 2021 at 11:44:52AM +0100, Auger Eric wrote:
> >> As mentionned by Robin, there are series planning to use
> >> DOMAIN_ATTR_NESTING to get info about the nested caps of the iommu
> (ARM
> >> and Intel):
> >>
> >> [Patch v8 00/10] vfio: expose virtual Shared Virtual Addressing to VMs
> >> patches 1, 2, 3
> >>
> >> Is the plan to introduce a new domain_get_nesting_info ops then?
> >
> > The plan as usual would be to add it the series adding that support.
> > Not sure what the merge plans are - if the series is ready to be
> > merged I could rebase on top of it, otherwise that series will need
> > to add the method.
> OK I think your series may be upstreamed first.
> 

Agree. The vSVA series is still undergoing a refactor according to Jason's
comment thus won't be ready in short term. It's better to let this one
go in first.

Thanks
Kevin
```