linux-kernel - Re: [PATCH v7 13/13] Documentation: userspace-api: iommufd: Update vIOMMU

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Message-ID: <Zyw8OUTLrG3Yx+Yx@Asurada-Nvidia>
Date: Wed, 6 Nov 2024 20:04:09 -0800
From: Nicolin Chen <nicolinc@...dia.com>
To: Bagas Sanjaya <bagasdotme@...il.com>
CC: <jgg@...dia.com>, <kevin.tian@...el.com>, <corbet@....net>,
	<joro@...tes.org>, <suravee.suthikulpanit@....com>, <will@...nel.org>,
	<robin.murphy@....com>, <dwmw2@...radead.org>, <shuah@...nel.org>,
	<iommu@...ts.linux.dev>, <linux-doc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-kselftest@...r.kernel.org>,
	<baolu.lu@...ux.intel.com>, <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>, <aik@....com>, <zhangfei.gao@...aro.org>,
	<patches@...ts.linux.dev>
Subject: Re: [PATCH v7 13/13] Documentation: userspace-api: iommufd: Update
 vIOMMU

On Thu, Nov 07, 2024 at 10:20:49AM +0700, Bagas Sanjaya wrote:
> On Wed, Nov 06, 2024 at 05:35:45PM -0800, Nicolin Chen wrote:
> > On Thu, Nov 07, 2024 at 07:56:31AM +0700, Bagas Sanjaya wrote:
> > > On Tue, Nov 05, 2024 at 12:04:29PM -0800, Nicolin Chen wrote:
> > > > With the introduction of the new object and its infrastructure, update the
> > > > doc to reflect that and add a new graph.
> > > > 
> > > > Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
> > > > Reviewed-by: Kevin Tian <kevin.tian@...el.com>
> > > > Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
> > > > ---
> > > >  Documentation/userspace-api/iommufd.rst | 69 ++++++++++++++++++++++++-
> > > >  1 file changed, 68 insertions(+), 1 deletion(-)
> > > > 
> > > > diff --git a/Documentation/userspace-api/iommufd.rst b/Documentation/userspace-api/iommufd.rst
> > > > index 2deba93bf159..a8b7766c2849 100644
> > > > --- a/Documentation/userspace-api/iommufd.rst
> > > > +++ b/Documentation/userspace-api/iommufd.rst
> > > > @@ -63,6 +63,37 @@ Following IOMMUFD objects are exposed to userspace:
> > > >    space usually has mappings from guest-level I/O virtual addresses to guest-
> > > >    level physical addresses.
> > > >  
> > > > +- IOMMUFD_OBJ_VIOMMU, representing a slice of the physical IOMMU instance,
> > > > +  passed to or shared with a VM. It may be some HW-accelerated virtualization
> > > > +  features and some SW resources used by the VM. For examples:
> > > > +  * Security namespace for guest owned ID, e.g. guest-controlled cache tags
> > > > +  * Non-device-affiliated event reporting, e.g. invalidation queue errors
> > > > +  * Access to a sharable nesting parent pagetable across physical IOMMUs
> > > > +  * Virtualization of various platforms IDs, e.g. RIDs and others
> > > > +  * Delivery of paravirtualized invalidation
> > > > +  * Direct assigned invalidation queues
> > > > +  * Direct assigned interrupts
> > > 
> > > The bullet list above is outputted in htmldocs build as long-running paragraph
> > > instead.
> > 
> > Oh, I overlooked this list.
> > 
> > Would the following change be okay?
> > 
> > -------------------------------------------------
> > diff --git a/Documentation/userspace-api/iommufd.rst b/Documentation/userspace-api/iommufd.rst
> > index 0ef22b3ca30b..011cbc71b6f5 100644
> > --- a/Documentation/userspace-api/iommufd.rst
> > +++ b/Documentation/userspace-api/iommufd.rst
> > @@ -68,2 +68,3 @@ Following IOMMUFD objects are exposed to userspace:
> >    features and some SW resources used by the VM. For examples:
> > +
> >    * Security namespace for guest owned ID, e.g. guest-controlled cache tags
> > @@ -75,2 +76,3 @@ Following IOMMUFD objects are exposed to userspace:
> >    * Direct assigned interrupts
> > +
> >    Such a vIOMMU object generally has the access to a nesting parent pagetable
> > -------------------------------------------------
> > 
> > The outputted html is showing a list with this.
> 
> Yup, that's right!

Thank you! Would it be possible for you to give a Reviewed-by,
given the condition of squashing this diff?

Likely, Jason will help squash it when taking this v7 via his
iommufd tree. So, we might not respin a v8.

Nicolin