From: Nicolin Chen <nicolinc@nvidia.com>
To: Jason Gunthorpe <jgg@nvidia.com>, "Tian, Kevin" <kevin.tian@intel.com>
Cc: "robin.murphy@arm.com" <robin.murphy@arm.com>,
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Subject: Re: [PATCH v2 5/5] vfio/iommu_type1: Simplify group attachment
Date: Tue, 21 Jun 2022 13:59:55 -0700 [thread overview]
Message-ID: <YrIxG616H5Pi0Qod@Asurada-Nvidia> (raw)
In-Reply-To: <20220620040317.GD5219@nvidia.com>
On Mon, Jun 20, 2022 at 01:03:17AM -0300, Jason Gunthorpe wrote:
> On Fri, Jun 17, 2022 at 04:07:20PM -0700, Nicolin Chen wrote:
>
> > > > > > + vfio_iommu_aper_expand(iommu, &iova_copy);
> > > > >
> > > > > but now it's done for every group detach. The aperture is decided
> > > > > by domain geometry which is not affected by attached groups.
> > > >
> > > > Yea, I've noticed this part. Actually Jason did this change for
> > > > simplicity, and I think it'd be safe to do so?
> > >
> > > Perhaps detach_destroy() can return a Boolean to indicate whether
> > > a domain is destroyed.
> >
> > It could be a solution but doesn't feel that common for a clean
> > function to have a return value indicating a special case. Maybe
> > passing in "&domain" so that we can check if it's NULL after?
>
> It is harmless to do every time, it just burns a few CPU cycles on a
> slow path. We don't need complexity to optmize it.
OK. I will keep it simple then. If Kevin or other has a further
objection, please let us know.
Thanks
Nic
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next prev parent reply other threads:[~2022-06-21 21:08 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-16 0:02 [PATCH v2 0/5] Simplify vfio_iommu_type1 attach/detach routine Nicolin Chen
2022-06-16 0:03 ` [PATCH v2 1/5] iommu: Return -EMEDIUMTYPE for incompatible domain and device/group Nicolin Chen
2022-06-16 2:09 ` Baolu Lu
2022-06-16 2:40 ` Nicolin Chen
2022-06-16 6:28 ` Tian, Kevin
2022-06-16 0:03 ` [PATCH v2 2/5] vfio/iommu_type1: Prefer to reuse domains vs match enforced cache coherency Nicolin Chen
2022-06-16 6:29 ` Tian, Kevin
2022-06-21 22:46 ` Alex Williamson
2022-06-21 23:47 ` Nicolin Chen
2022-06-16 0:03 ` [PATCH v2 3/5] vfio/iommu_type1: Remove the domain->ops comparison Nicolin Chen
2022-06-16 6:40 ` Tian, Kevin
2022-06-16 22:23 ` Nicolin Chen
2022-06-22 7:54 ` Robin Murphy
2022-06-23 3:50 ` Tian, Kevin
2022-06-23 7:47 ` Nicolin Chen
2022-06-24 13:16 ` Jason Gunthorpe
2022-06-24 18:31 ` Robin Murphy
2022-06-24 18:46 ` Jason Gunthorpe
2022-06-16 0:03 ` [PATCH v2 4/5] vfio/iommu_type1: Clean up update_dirty_scope in detach_group() Nicolin Chen
2022-06-16 6:45 ` Tian, Kevin
2022-06-16 22:26 ` Nicolin Chen
2022-06-16 0:03 ` [PATCH v2 5/5] vfio/iommu_type1: Simplify group attachment Nicolin Chen
2022-06-16 7:08 ` Tian, Kevin
2022-06-16 22:40 ` Nicolin Chen
2022-06-17 2:53 ` Tian, Kevin
2022-06-17 23:07 ` Nicolin Chen
2022-06-20 4:03 ` Jason Gunthorpe
2022-06-21 20:59 ` Nicolin Chen [this message]
2022-06-20 10:11 ` Robin Murphy
2022-06-21 21:08 ` Nicolin Chen
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