RE: [PATCH 15/17] iommu: remove DOMAIN_ATTR_NESTING

From: Auger Eric
Sent: Monday, March 15, 2021 3:52 PM
To: Christoph Hellwig <hch@lst.de>
Cc: kvm@vger.kernel.org; Will Deacon <will@kernel.org>; linuxppc-
dev@lists.ozlabs.org; dri-devel@lists.freedesktop.org; Li Yang
[off-list ref]; iommu@lists.linux-foundation.org;

Hi Christoph,

On 3/14/21 4:58 PM, Christoph Hellwig wrote:

quoted

On Sun, Mar 14, 2021 at 11:44:52AM +0100, Auger Eric wrote:

quoted

As mentionned by Robin, there are series planning to use
DOMAIN_ATTR_NESTING to get info about the nested caps of the iommu

(ARM

quoted

quoted

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