linux-kernel - Re: [PATCH v2 02/19] iommufd/viommu: Add IOMMUFD_OBJ_VIOMMU and IOMMU_VIOMMU

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Message-ID: <20240904233707.GA1358970@nvidia.com>
Date: Wed, 4 Sep 2024 20:37:07 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Nicolin Chen <nicolinc@...dia.com>
Cc: Baolu Lu <baolu.lu@...ux.intel.com>, kevin.tian@...el.com,
	will@...nel.org, joro@...tes.org, suravee.suthikulpanit@....com,
	robin.murphy@....com, dwmw2@...radead.org, 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 Wed, Sep 04, 2024 at 10:29:26AM -0700, Nicolin Chen wrote:
> On Wed, Sep 04, 2024 at 01:26:21PM -0300, Jason Gunthorpe wrote:
> > On Sun, Sep 01, 2024 at 10:27:09PM -0700, Nicolin Chen wrote:
> > > On Sun, Sep 01, 2024 at 10:39:17AM +0800, Baolu Lu wrote:
> > > > On 2024/8/28 0:59, Nicolin Chen wrote:
> > > > > +int iommufd_viommu_alloc_ioctl(struct iommufd_ucmd *ucmd)
> > > > > +{
> > > > > +     struct iommu_viommu_alloc *cmd = ucmd->cmd;
> > > > > +     struct iommufd_hwpt_paging *hwpt_paging;
> > > > > +     struct iommufd_viommu *viommu;
> > > > > +     struct iommufd_device *idev;
> > > > > +     int rc;
> > > > > +
> > > > > +     if (cmd->flags)
> > > > > +             return -EOPNOTSUPP;
> > > > > +
> > > > > +     idev = iommufd_get_device(ucmd, cmd->dev_id);
> > > > 
> > > > Why does a device reference count is needed here? When is this reference
> > > > count released after the VIOMMU is allocated?
> > > 
> > > Hmm, it was used to get dev->iommu->iommu_dev to pin the VIOMMU to
> > > a physical IOMMU instance (in v1). Jason suggested to remove that,
> > > yet I didn't realize that this idev is now completely useless.
> > > 
> > > With that being said, a parent HWPT could be shared across VIOMUs
> > > allocated for the same VM. So, I think we do need a dev pointer to
> > > know which physical instance the VIOMMU allocates for, especially
> > > for a driver-managed VIOMMU.
> > 
> > Eventually you need a way to pin the physical iommu, without pinning
> > any idevs. Not sure how best to do that
> 
> Just trying to clarify "without pinning any idevs", does it mean
> we shouldn't pass in an idev_id to get dev->iommu->iommu_dev?

>From userspace we have no choice but to use an idev_id to locate the
physical iommu

But since we want to support hotplug it is rather problematic if that
idev is permanently locked down.

> Otherwise, iommu_probe_device_lock and iommu_device_lock in the
> iommu.c are good enough to lock dev->iommu and iommu->list. And
> I think we just need an iommu helper refcounting the dev_iommu
> (or iommu_device) as we previously discussed.

If you have a ref on an idev then the iommu_dev has to be stable, so
you can just incr some refcount and then drop the idev stuff.

Jason