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Message-ID: <ZtnylrkYMwzbpAl2@nvidia.com>
Date: Thu, 5 Sep 2024 11:04:06 -0700
From: Nicolin Chen <nicolinc@...dia.com>
To: Jason Gunthorpe <jgg@...dia.com>
CC: <kevin.tian@...el.com>, <will@...nel.org>, <joro@...tes.org>,
<suravee.suthikulpanit@....com>, <robin.murphy@....com>,
<dwmw2@...radead.org>, <baolu.lu@...ux.intel.com>, <shuah@...nel.org>,
<linux-kernel@...r.kernel.org>, <iommu@...ts.linux.dev>,
<linux-arm-kernel@...ts.infradead.org>, <linux-kselftest@...r.kernel.org>,
<eric.auger@...hat.com>, <jean-philippe@...aro.org>, <mdf@...nel.org>,
<mshavit@...gle.com>, <shameerali.kolothum.thodi@...wei.com>,
<smostafa@...gle.com>, <yi.l.liu@...el.com>
Subject: Re: [PATCH v2 02/19] iommufd/viommu: Add IOMMUFD_OBJ_VIOMMU and
IOMMU_VIOMMU_ALLOC ioctl
On Thu, Sep 05, 2024 at 02:41:00PM -0300, Jason Gunthorpe wrote:
> > > > + * @out_viommu_id: Output virtual IOMMU ID for the allocated object
> > > > + *
> > > > + * Allocate a virtual IOMMU object that holds a (shared) nesting parent HWPT
> > >
> > > Allocate a virtual IOMMU object that represents the underlying
> > > physical IOMMU's virtualization support. The vIOMMU object is a
> > > security isolated slice of the physical IOMMU HW that is unique to a
> > > specific VM. Operations global to the IOMMU are connected to the
> > > vIOMMU, such as:
> > > - Security namespace for guest owned ID, eg guest controlled cache tags
> > > - Virtualization of various platforms IDs like RIDs and others
> > > - direct assigned invalidation queues
> > > - direct assigned interrupts
> > > - non-affiliated event reporting
> > > - Delivery of paravirtualized invalidation
> >
> > Ack.
>
> Also write something about the HWPT..
Assuming it's about sharing parent HWPT, ack.
Nicolin
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