From: Jean-Philippe Brucker <jean-philippe@linaro.org>
To: "Liu, Yi L" <yi.l.liu@intel.com>
Cc: "Tian, Kevin" <kevin.tian@intel.com>,
"alex.williamson@redhat.com" <alex.williamson@redhat.com>,
"eric.auger@redhat.com" <eric.auger@redhat.com>,
"jacob.jun.pan@linux.intel.com" <jacob.jun.pan@linux.intel.com>,
"joro@8bytes.org" <joro@8bytes.org>,
"Raj, Ashok" <ashok.raj@intel.com>,
"Tian, Jun J" <jun.j.tian@intel.com>,
"Sun, Yi Y" <yi.y.sun@intel.com>,
"peterx@redhat.com" <peterx@redhat.com>,
"iommu@lists.linux-foundation.org"
<iommu@lists.linux-foundation.org>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"Wu, Hao" <hao.wu@intel.com>
Subject: Re: [PATCH v1 6/8] vfio/type1: Bind guest page tables to host
Date: Thu, 9 Apr 2020 11:38:39 +0200 [thread overview]
Message-ID: <20200409093839.GH2435@myrica> (raw)
In-Reply-To: <A2975661238FB949B60364EF0F2C25743A228CCA@SHSMSX104.ccr.corp.intel.com>
On Thu, Apr 09, 2020 at 09:15:29AM +0000, Liu, Yi L wrote:
> > From: Jean-Philippe Brucker <jean-philippe@linaro.org>
> > Sent: Thursday, April 9, 2020 4:29 PM
> > To: Liu, Yi L <yi.l.liu@intel.com>
> >
> > On Tue, Apr 07, 2020 at 10:33:25AM +0000, Liu, Yi L wrote:
> > > Hi Jean,
> > >
> > > > From: Jean-Philippe Brucker < jean-philippe@linaro.org >
> > > > Sent: Friday, April 3, 2020 4:35 PM
> > > > Subject: Re: [PATCH v1 6/8] vfio/type1: Bind guest page tables to host
> > > >
> > > > On Thu, Apr 02, 2020 at 08:05:29AM +0000, Liu, Yi L wrote:
> > > > > > > > > static long vfio_iommu_type1_ioctl(void *iommu_data,
> > > > > > > > > default:
> > > > > > > > > return -EINVAL;
> > > > > > > > > }
> > > > > > > > > +
> > > > > > > > > + } else if (cmd == VFIO_IOMMU_BIND) {
> > > > > > > >
> > > > > > > > BIND what? VFIO_IOMMU_BIND_PASID sounds clearer to me.
> > > > > > >
> > > > > > > Emm, it's up to the flags to indicate bind what. It was proposed to
> > > > > > > cover the three cases below:
> > > > > > > a) BIND/UNBIND_GPASID
> > > > > > > b) BIND/UNBIND_GPASID_TABLE
> > > > > > > c) BIND/UNBIND_PROCESS
> > > > > > > <only a) is covered in this patch>
> > > > > > > So it's called VFIO_IOMMU_BIND.
> > > > > >
> > > > > > but aren't they all about PASID related binding?
> > > > >
> > > > > yeah, I can rename it. :-)
> > > >
> > > > I don't know if anyone intends to implement it, but SMMUv2 supports
> > > > nesting translation without any PASID support. For that case the name
> > > > VFIO_IOMMU_BIND_GUEST_PGTBL without "PASID" anywhere makes more
> > sense.
> > > > Ideally we'd also use a neutral name for the IOMMU API instead of
> > > > bind_gpasid(), but that's easier to change later.
> > >
> > > I agree VFIO_IOMMU_BIND is somehow not straight-forward. Especially, it may
> > > cause confusion when thinking about VFIO_SET_IOMMU. How about using
> > > VFIO_NESTING_IOMMU_BIND_STAGE1 to cover a) and b)? And has another
> > > VFIO_BIND_PROCESS in future for the SVA bind case.
> >
> > I think minimizing the number of ioctls is more important than finding the
> > ideal name. VFIO_IOMMU_BIND was fine to me, but if it's too vague then
> > rename it to VFIO_IOMMU_BIND_PASID and we'll just piggy-back on it for
> > non-PASID things (they should be rare enough).
> maybe we can start with VFIO_IOMMU_BIND_PASID. Actually, there is
> also a discussion on reusing the same ioctl and vfio structure for
> pasid_alloc/free, bind/unbind_gpasid. and cache_inv. how about your
> opinion?
Merging bind with unbind and alloc with free makes sense. I'd leave at
least invalidate a separate ioctl, because alloc/bind/unbind/free are
setup functions while invalidate is a runtime thing and performance
sensitive. But I can't see a good reason not to merge them all together,
so either way is fine by me.
Thanks,
Jean
next prev parent reply other threads:[~2020-04-09 9:54 UTC|newest]
Thread overview: 110+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-22 12:31 [PATCH v1 0/8] vfio: expose virtual Shared Virtual Addressing to VMs Liu, Yi L
2020-03-22 12:31 ` [PATCH v1 1/8] vfio: Add VFIO_IOMMU_PASID_REQUEST(alloc/free) Liu, Yi L
2020-03-22 16:21 ` kbuild test robot
2020-03-30 8:32 ` Tian, Kevin
2020-03-30 14:36 ` Liu, Yi L
2020-03-31 5:40 ` Tian, Kevin
2020-03-31 13:22 ` Liu, Yi L
2020-04-01 5:43 ` Tian, Kevin
2020-04-01 5:48 ` Liu, Yi L
2020-03-31 7:53 ` Christoph Hellwig
2020-03-31 8:17 ` Liu, Yi L
2020-03-31 8:32 ` Liu, Yi L
2020-03-31 8:36 ` Liu, Yi L
2020-03-31 9:15 ` Christoph Hellwig
2020-04-02 13:52 ` Jean-Philippe Brucker
2020-04-03 11:56 ` Liu, Yi L
2020-04-03 12:39 ` Jean-Philippe Brucker
2020-04-03 12:44 ` Liu, Yi L
2020-04-02 17:50 ` Alex Williamson
2020-04-03 5:58 ` Tian, Kevin
2020-04-03 15:14 ` Alex Williamson
2020-04-07 4:42 ` Tian, Kevin
2020-04-07 15:14 ` Alex Williamson
2020-04-03 13:12 ` Liu, Yi L
2020-04-03 17:50 ` Alex Williamson
2020-04-07 4:52 ` Tian, Kevin
2020-04-08 0:52 ` Liu, Yi L
2020-03-22 12:31 ` [PATCH v1 2/8] vfio/type1: Add vfio_iommu_type1 parameter for quota tuning Liu, Yi L
2020-03-22 17:20 ` kbuild test robot
2020-03-30 8:40 ` Tian, Kevin
2020-03-30 8:52 ` Liu, Yi L
2020-03-30 9:19 ` Tian, Kevin
2020-03-30 9:26 ` Liu, Yi L
2020-03-30 11:44 ` Tian, Kevin
2020-04-02 17:58 ` Alex Williamson
2020-04-03 8:15 ` Liu, Yi L
2020-03-22 12:32 ` [PATCH v1 3/8] vfio/type1: Report PASID alloc/free support to userspace Liu, Yi L
2020-03-30 9:43 ` Tian, Kevin
2020-04-01 7:46 ` Liu, Yi L
2020-04-01 9:41 ` Auger Eric
2020-04-01 13:13 ` Liu, Yi L
2020-04-02 18:01 ` Alex Williamson
2020-04-03 8:17 ` Liu, Yi L
2020-04-03 17:28 ` Alex Williamson
2020-04-04 11:36 ` Liu, Yi L
2020-03-22 12:32 ` [PATCH v1 4/8] vfio: Check nesting iommu uAPI version Liu, Yi L
2020-03-22 18:30 ` kbuild test robot
2020-03-22 12:32 ` [PATCH v1 5/8] vfio/type1: Report 1st-level/stage-1 format to userspace Liu, Yi L
2020-03-22 16:44 ` kbuild test robot
2020-03-30 11:48 ` Tian, Kevin
2020-04-01 7:38 ` Liu, Yi L
2020-04-01 7:56 ` Tian, Kevin
2020-04-01 8:06 ` Liu, Yi L
2020-04-01 8:08 ` Tian, Kevin
2020-04-01 8:09 ` Liu, Yi L
2020-04-01 8:51 ` Auger Eric
2020-04-01 12:51 ` Liu, Yi L
2020-04-01 13:01 ` Auger Eric
2020-04-03 8:23 ` Jean-Philippe Brucker
2020-04-07 9:43 ` Liu, Yi L
2020-04-08 1:02 ` Liu, Yi L
2020-04-08 10:27 ` Auger Eric
2020-04-09 8:14 ` Jean-Philippe Brucker
2020-04-09 9:01 ` Auger Eric
2020-04-09 12:47 ` Liu, Yi L
2020-04-10 3:28 ` Auger Eric
2020-04-10 3:48 ` Liu, Yi L
2020-04-10 12:30 ` Liu, Yi L
2020-04-02 19:20 ` Alex Williamson
2020-04-03 11:59 ` Liu, Yi L
2020-03-22 12:32 ` [PATCH v1 6/8] vfio/type1: Bind guest page tables to host Liu, Yi L
2020-03-22 18:10 ` kbuild test robot
2020-03-30 12:46 ` Tian, Kevin
2020-04-01 9:13 ` Liu, Yi L
2020-04-02 2:12 ` Tian, Kevin
2020-04-02 8:05 ` Liu, Yi L
2020-04-03 8:34 ` Jean-Philippe Brucker
2020-04-07 10:33 ` Liu, Yi L
2020-04-09 8:28 ` Jean-Philippe Brucker
2020-04-09 9:15 ` Liu, Yi L
2020-04-09 9:38 ` Jean-Philippe Brucker [this message]
2020-04-02 19:57 ` Alex Williamson
2020-04-03 13:30 ` Liu, Yi L
2020-04-03 18:11 ` Alex Williamson
2020-04-04 10:28 ` Liu, Yi L
2020-04-11 5:52 ` Liu, Yi L
2020-03-22 12:32 ` [PATCH v1 7/8] vfio/type1: Add VFIO_IOMMU_CACHE_INVALIDATE Liu, Yi L
2020-03-30 12:58 ` Tian, Kevin
2020-04-01 7:49 ` Liu, Yi L
2020-03-31 7:56 ` Christoph Hellwig
2020-03-31 10:48 ` Liu, Yi L
2020-04-02 20:24 ` Alex Williamson
2020-04-03 6:39 ` Tian, Kevin
2020-04-03 15:31 ` Jacob Pan
2020-04-03 15:34 ` Alex Williamson
2020-04-08 2:28 ` Liu, Yi L
2020-04-16 10:40 ` Liu, Yi L
2020-04-16 12:09 ` Tian, Kevin
2020-04-16 12:42 ` Auger Eric
2020-04-16 13:28 ` Tian, Kevin
2020-04-16 15:12 ` Auger Eric
2020-04-16 14:40 ` Alex Williamson
2020-04-16 14:48 ` Alex Williamson
2020-04-17 6:03 ` Liu, Yi L
2020-03-22 12:32 ` [PATCH v1 8/8] vfio/type1: Add vSVA support for IOMMU-backed mdevs Liu, Yi L
2020-03-30 13:18 ` Tian, Kevin
2020-04-01 7:51 ` Liu, Yi L
2020-04-02 20:33 ` Alex Williamson
2020-04-03 13:39 ` Liu, Yi L
2020-03-26 12:56 ` [PATCH v1 0/8] vfio: expose virtual Shared Virtual Addressing to VMs Liu, Yi L
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