linux-kernel - Re: [PATCH v1 02/14] iommufd: Add nesting related data structures for ARM SMMUv3

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Message-ID: <ZAq3LJgbo8ApejvU@Asurada-Nvidia>
Date:   Thu, 9 Mar 2023 20:50:52 -0800
From:   Nicolin Chen <nicolinc@...dia.com>
To:     Jason Gunthorpe <jgg@...dia.com>
CC:     Jean-Philippe Brucker <jean-philippe@...aro.org>,
        <robin.murphy@....com>, <will@...nel.org>, <eric.auger@...hat.com>,
        <kevin.tian@...el.com>, <baolu.lu@...ux.intel.com>,
        <joro@...tes.org>, <shameerali.kolothum.thodi@...wei.com>,
        <linux-arm-kernel@...ts.infradead.org>, <iommu@...ts.linux.dev>,
        <linux-kernel@...r.kernel.org>, <yi.l.liu@...el.com>
Subject: Re: [PATCH v1 02/14] iommufd: Add nesting related data structures
 for ARM SMMUv3

On Thu, Mar 09, 2023 at 10:48:50AM -0400, Jason Gunthorpe wrote:

> Nicolin, I think we should tweak the uAPI here so that the
> invalidation opaque data has a format tagged on its own, instead of
> re-using the HWPT tag. Ie you can have a ARM SMMUv3 invalidate type
> tag and also a virtio-viommu invalidate type tag.

The invalidation tage is shared with the hwpt allocation. Does
it mean that virtio-iommu won't have it's own allocation tag?

Thanks
Nic