From: Jacob Pan <jacob.jun.pan@linux.intel.com>
To: Alex Williamson <alex.williamson@redhat.com>
Cc: iommu@lists.linux-foundation.org,
LKML <linux-kernel@vger.kernel.org>,
"Lu Baolu" <baolu.lu@linux.intel.com>,
Joerg Roedel <joro@8bytes.org>,
David Woodhouse <dwmw2@infradead.org>,
Yi Liu <yi.l.liu@intel.com>, "Tian, Kevin" <kevin.tian@intel.com>,
Raj Ashok <ashok.raj@intel.com>,
"Christoph Hellwig" <hch@infradead.org>,
Jean-Philippe Brucker <jean-philippe@linaro.com>,
Eric Auger <eric.auger@redhat.com>,
Jonathan Corbet <corbet@lwn.net>,
jacob.jun.pan@linux.intel.com
Subject: Re: [PATCH v2 1/3] docs: IOMMU user API
Date: Tue, 16 Jun 2020 08:22:12 -0700 [thread overview]
Message-ID: <20200616082212.0c1611dd@jacob-builder> (raw)
In-Reply-To: <20200611172727.78dbb822@jacob-builder>
On Thu, 11 Jun 2020 17:27:27 -0700
Jacob Pan <jacob.jun.pan@linux.intel.com> wrote:
> >
> > But then I thought it even better if VFIO leaves the entire
> > copy_from_user() to the layer consuming it.
> >
> OK. Sounds good, that was what Kevin suggested also. I just wasn't
> sure how much VFIO wants to inspect, I thought VFIO layer wanted to
> do a sanity check.
>
> Anyway, I will move copy_from_user to iommu uapi layer.
Just one more point brought up by Yi when we discuss this offline.
If we move copy_from_user to iommu uapi layer, then there will be
multiple copy_from_user calls for the same data when a VFIO container
has multiple domains, devices. For bind, it might be OK. But might be
additional overhead for TLB flush request from the guest.
Thoughts?
Jacob
next prev parent reply other threads:[~2020-06-16 15:16 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-11 4:12 [PATCH v2 0/3] IOMMU user API enhancement Jacob Pan
2020-06-11 4:12 ` [PATCH v2 1/3] docs: IOMMU user API Jacob Pan
2020-06-11 6:33 ` Lu Baolu
2020-06-12 22:05 ` Jacob Pan
2020-06-11 9:30 ` Jonathan Cameron
2020-06-12 22:53 ` Jacob Pan
2020-06-11 13:55 ` Jonathan Corbet
2020-06-11 16:38 ` Jacob Pan
2020-06-11 15:47 ` Alex Williamson
2020-06-11 19:52 ` Jacob Pan
2020-06-11 20:40 ` Alex Williamson
2020-06-12 0:27 ` Jacob Pan
2020-06-12 7:38 ` Tian, Kevin
2020-06-12 13:09 ` Jacob Pan
2020-06-16 15:22 ` Jacob Pan [this message]
2020-06-17 6:20 ` Liu, Yi L
2020-06-17 8:28 ` Tian, Kevin
2020-06-18 21:48 ` Alex Williamson
2020-06-19 2:15 ` Liu, Yi L
2020-06-19 2:54 ` Alex Williamson
2020-06-19 3:30 ` Liu, Yi L
2020-06-19 16:37 ` Alex Williamson
2020-06-21 5:46 ` Liu, Yi L
2020-06-11 4:12 ` [PATCH v2 2/3] iommu/uapi: Add argsz for user filled data Jacob Pan
2020-06-11 16:49 ` Alex Williamson
2020-06-12 0:02 ` Jacob Pan
2020-06-11 4:12 ` [PATCH v2 3/3] iommu/vt-d: Sanity check uapi argsz filled by users Jacob Pan
2020-06-11 17:08 ` Alex Williamson
2020-06-11 20:02 ` Jacob Pan
2020-06-11 20:55 ` Alex Williamson
2020-06-11 23:58 ` Jacob Pan
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