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From: Paul Durrant <Paul.Durrant@citrix.com>
To: 'Jan Beulich' <JBeulich@suse.com>
Cc: xen-devel <xen-devel@lists.xenproject.org>,
	Kevin Tian <kevin.tian@intel.com>,
	George Dunlap <George.Dunlap@citrix.com>
Subject: Re: [PATCH v6 08/14] vtd: add lookup_page method to iommu_ops
Date: Fri, 7 Sep 2018 15:24:15 +0000	[thread overview]
Message-ID: <5fcf07dd87514ac0a1f0142f604adbd3@AMSPEX02CL03.citrite.net> (raw)
In-Reply-To: <5B92919402000078001E66D9@prv1-mh.provo.novell.com>

> -----Original Message-----
> From: Jan Beulich [mailto:JBeulich@suse.com]
> Sent: 07 September 2018 15:56
> To: Paul Durrant <Paul.Durrant@citrix.com>
> Cc: George Dunlap <George.Dunlap@citrix.com>; Kevin Tian
> <kevin.tian@intel.com>; xen-devel <xen-devel@lists.xenproject.org>
> Subject: RE: [PATCH v6 08/14] vtd: add lookup_page method to iommu_ops
> 
> >>> On 07.09.18 at 14:36, <Paul.Durrant@citrix.com> wrote:
> >>  -----Original Message-----
> >> From: Jan Beulich [mailto:JBeulich@suse.com]
> >> Sent: 07 September 2018 12:11
> >> To: Paul Durrant <Paul.Durrant@citrix.com>
> >> Cc: George Dunlap <George.Dunlap@citrix.com>; Kevin Tian
> >> <kevin.tian@intel.com>; xen-devel <xen-devel@lists.xenproject.org>
> >> Subject: Re: [PATCH v6 08/14] vtd: add lookup_page method to
> iommu_ops
> >>
> >> >>> On 23.08.18 at 11:47, <paul.durrant@citrix.com> wrote:
> >> > This patch adds a new method to the VT-d IOMMU implementation to
> find
> >> the
> >> > MFN currently mapped by the specified BFN along with a wrapper
> function
> >> in
> >> > generic IOMMU code to call the implementation if it exists.
> >>
> >> For this to go in, I think the AMD side of it wants to also be implemented.
> >
> > Why? It can be done later. Nothing existing is going to break if it is not
> > implemented.
> 
> If it was something that's terribly difficult to implement, I'd
> probably agree. But introducing PV IOMMU for Intel only (and
> hence once again making AMD a second class citizen) I don't
> really like. Another thing would be if you had the implementation
> ready, but the maintainer(s) don't respond...
> 

It's all time though. The fact is that, in XenServer, we've never had PV-IOMMU for AMD. It would be wonderful to have it for AMD too and indeed I may find the time to do it, but is that really a reason to block integration of these patches when no actual regression will be caused by of the lack of AMD support?

  Paul

> Jan
> 


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  reply	other threads:[~2018-09-07 15:24 UTC|newest]

Thread overview: 111+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-23  9:46 [PATCH v6 00/14] paravirtual IOMMU interface Paul Durrant
2018-08-23  9:46 ` [PATCH v6 01/14] iommu: introduce the concept of BFN Paul Durrant
2018-08-30 15:59   ` Jan Beulich
2018-09-03  8:23     ` Paul Durrant
2018-09-03 11:46       ` Jan Beulich
2018-09-04  6:48         ` Tian, Kevin
2018-09-04  8:32           ` Jan Beulich
2018-09-04  8:37             ` Tian, Kevin
2018-09-04  8:47               ` Jan Beulich
2018-09-04  8:49                 ` Paul Durrant
2018-09-04  9:08                   ` Jan Beulich
2018-09-05  0:42                     ` Tian, Kevin
2018-09-05  6:48                       ` Jan Beulich
2018-09-05  6:56                         ` Tian, Kevin
2018-09-05  7:11                           ` Jan Beulich
2018-09-05  9:13                             ` Paul Durrant
2018-09-05  9:38                               ` Jan Beulich
2018-09-06 10:36                                 ` Paul Durrant
2018-09-06 13:13                                   ` Jan Beulich
2018-09-06 14:54                                     ` Paul Durrant
2018-09-07  1:47                                       ` Tian, Kevin
2018-09-07  6:24                                         ` Jan Beulich
2018-09-07  8:13                                           ` Paul Durrant
2018-09-07  8:16                                             ` Tian, Kevin
2018-09-07  8:25                                               ` Paul Durrant
2018-08-23  9:46 ` [PATCH v6 02/14] iommu: make use of type-safe BFN and MFN in exported functions Paul Durrant
2018-09-04 10:29   ` Jan Beulich
2018-08-23  9:47 ` [PATCH v6 03/14] iommu: push use of type-safe BFN and MFN into iommu_ops Paul Durrant
2018-09-04 10:32   ` Jan Beulich
2018-08-23  9:47 ` [PATCH v6 04/14] iommu: don't domain_crash() inside iommu_map/unmap_page() Paul Durrant
2018-09-04 10:38   ` Jan Beulich
2018-09-04 10:39     ` Paul Durrant
2018-08-23  9:47 ` [PATCH v6 05/14] public / x86: introduce __HYPERCALL_iommu_op Paul Durrant
2018-09-04 11:50   ` Jan Beulich
2018-09-04 12:23     ` Paul Durrant
2018-09-04 12:55       ` Jan Beulich
2018-09-04 13:17         ` Paul Durrant
2018-09-07 10:52   ` Jan Beulich
2018-08-23  9:47 ` [PATCH v6 06/14] iommu: track reserved ranges using a rangeset Paul Durrant
2018-09-07 10:40   ` Jan Beulich
2018-09-11  9:28     ` Paul Durrant
2018-08-23  9:47 ` [PATCH v6 07/14] x86: add iommu_op to query reserved ranges Paul Durrant
2018-09-07 11:01   ` Jan Beulich
2018-09-11  9:34     ` Paul Durrant
2018-09-11  9:43       ` Jan Beulich
2018-09-13  6:11     ` Tian, Kevin
2018-08-23  9:47 ` [PATCH v6 08/14] vtd: add lookup_page method to iommu_ops Paul Durrant
2018-09-07 11:11   ` Jan Beulich
2018-09-07 12:36     ` Paul Durrant
2018-09-07 14:56       ` Jan Beulich
2018-09-07 15:24         ` Paul Durrant [this message]
2018-09-07 15:52           ` Jan Beulich
2018-09-12  8:31     ` Paul Durrant
2018-09-12  8:43       ` Jan Beulich
2018-09-12  8:45         ` Paul Durrant
2018-09-12  8:51           ` Paul Durrant
2018-09-12  8:53             ` Paul Durrant
2018-09-12  9:03               ` Jan Beulich
2018-09-12  9:05                 ` Paul Durrant
2018-09-12  9:12                   ` Jan Beulich
2018-09-12  9:15                     ` Paul Durrant
2018-09-12  9:21                       ` Jan Beulich
2018-09-12  9:30                         ` Paul Durrant
2018-09-12 10:07                           ` Jan Beulich
2018-09-12 10:09                             ` Paul Durrant
2018-09-12 12:15                               ` Jan Beulich
2018-09-12 12:22                                 ` Paul Durrant
2018-09-12 12:39                                   ` Jan Beulich
2018-09-12 12:53                                     ` Paul Durrant
2018-09-12 13:19                                       ` Jan Beulich
2018-09-12 13:25                                         ` Paul Durrant
2018-09-12 13:39                                           ` Jan Beulich
2018-09-12 13:43                                             ` Paul Durrant
2018-09-12  8:59           ` Jan Beulich
2018-08-23  9:47 ` [PATCH v6 09/14] mm / iommu: include need_iommu() test in iommu_use_hap_pt() Paul Durrant
2018-09-07 11:20   ` Jan Beulich
2018-09-11  9:39     ` Paul Durrant
2018-09-11  9:47       ` Jan Beulich
2018-09-13  6:23         ` Tian, Kevin
2018-09-13  8:34           ` Paul Durrant
2018-08-23  9:47 ` [PATCH v6 10/14] mm / iommu: split need_iommu() into has_iommu_pt() and need_iommu_pt_sync() Paul Durrant
2018-08-23 11:10   ` Razvan Cojocaru
2018-09-11 14:31   ` Jan Beulich
2018-09-11 15:40     ` Paul Durrant
2018-09-12  6:45       ` Jan Beulich
2018-09-12  8:07         ` Paul Durrant
2018-08-23  9:47 ` [PATCH v6 11/14] x86: add iommu_op to enable modification of IOMMU mappings Paul Durrant
2018-09-11 14:48   ` Jan Beulich
2018-09-11 15:52     ` Paul Durrant
2018-09-12  6:53       ` Jan Beulich
2018-09-12  8:04         ` Paul Durrant
2018-08-23  9:47 ` [PATCH v6 12/14] memory: add get_paged_gfn() as a wrapper Paul Durrant
2018-08-23 10:24   ` Julien Grall
2018-08-23 10:30     ` Paul Durrant
2018-09-11 14:56   ` Jan Beulich
2018-09-12  9:10     ` Paul Durrant
2018-09-12  9:15       ` Jan Beulich
2018-09-12 10:01         ` George Dunlap
2018-09-12 10:08           ` Paul Durrant
2018-09-12 10:10           ` Jan Beulich
2018-08-23  9:47 ` [PATCH v6 13/14] x86: add iommu_ops to modify and flush IOMMU mappings Paul Durrant
2018-09-11 15:15   ` Jan Beulich
2018-09-12  7:03   ` Jan Beulich
2018-09-12  8:02     ` Paul Durrant
2018-09-12  8:27       ` Jan Beulich
2018-09-13  6:41       ` Tian, Kevin
2018-09-13  8:32         ` Paul Durrant
2018-09-13  8:49         ` Jan Beulich
2018-08-23  9:47 ` [PATCH v6 14/14] x86: extend the map and unmap iommu_ops to support grant references Paul Durrant
2018-09-12 14:12   ` Jan Beulich
2018-09-12 16:28     ` Paul Durrant

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