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From: "Xuquan (Quan Xu)" <xuquan8@huawei.com>
To: "Edgar E. Iglesias" <edgar.iglesias@gmail.com>,
	Lan Tianyu <tianyu.lan@intel.com>
Cc: "yang.zhang.wz@gmail.com" <yang.zhang.wz@gmail.com>,
	"Tian, Kevin" <kevin.tian@intel.com>,
	Stefano Stabellini <sstabellini@kernel.org>,
	Jan Beulich <JBeulich@suse.com>,
	Andrew Cooper <andrew.cooper3@citrix.com>,
	"ian.jackson@eu.citrix.com" <ian.jackson@eu.citrix.com>,
	Julien Grall <julien.grall@arm.com>,
	"xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>,
	"Nakajima, Jun" <jun.nakajima@intel.com>,
	"anthony.perard@citrix.com" <anthony.perard@citrix.com>,
	Roger Pau Monne <roger.pau@citrix.com>
Subject: Re: Xen virtual IOMMU high level design doc
Date: Fri, 25 Nov 2016 02:01:10 +0000	[thread overview]
Message-ID: <E0A769A898ADB6449596C41F51EF62C6AD2346@SZXEMI506-MBX.china.huawei.com> (raw)
In-Reply-To: <20161124133749.GC9606@toto>

On November 24, 2016 9:38 PM, <edgar.iglesias@gmail.com>
>On Thu, Nov 24, 2016 at 02:49:41PM +0800, Lan Tianyu wrote:
>> On 2016年11月24日 12:09, Edgar E. Iglesias wrote:
>> >>>> Hi,
>> >>>> > > >
>> >>>> > > > I have a few questions.
>> >>>> > > >
>> >>>> > > > If I understand correctly, you'll be emulating an Intel IOMMU in
>Xen.
>> >>>> > > > So guests will essentially create intel iommu style page-tables.
>> >>>> > > >
>> >>>> > > > If we were to use this on Xen/ARM, we would likely be
>> >>>> > > > modelling an ARM SMMU as a vIOMMU. Since Xen on ARM
>does
>> >>>> > > > not use QEMU for emulation, the hypervisor OPs for QEMUs
>xen dummy IOMMU queries would not really be used.
>> >>>> > > > Do I understand this correctly?
>> >>> > >
>> >>> > > I think they could be called from the toolstack. This is why I
>> >>> > > was saying in the other thread that the hypercalls should be
>> >>> > > general enough that QEMU is not the only caller.
>> >>> > >
>> >>> > > For PVH and ARM guests, the toolstack should be able to setup
>> >>> > > the vIOMMU on behalf of the guest without QEMU intervention.
>> > OK, I see. Or, I think I understand, not sure :-)
>> >
>> > In QEMU when someone changes mappings in an IOMMU there will be
>a
>> > notifier to tell caches upstream that mappings have changed. I think
>> > we will need to prepare for that. I.e when TCG CPUs sit behind an
>IOMMU.
>>
>> For Xen side, we may notify pIOMMU driver about mapping change via
>> calling pIOMMU driver's API in vIOMMU.
>
>I was refering to the other way around. When a guest modifies the
>mappings for a vIOMMU, the driver domain with QEMU and vDevices needs
>to be notified.
>
>I couldn't find any mention of this in the document...
>
>

Edgar,
As mentioned it supports VFIO-based user space driver (e.g. DPDK) in the guest.
I am afraid all of guest memory is pinned.. Lan, right?

Quan


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  reply	other threads:[~2016-11-25  2:01 UTC|newest]

Thread overview: 86+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-05-26  8:29 Discussion about virtual iommu support for Xen guest Lan Tianyu
2016-05-26  8:42 ` Dong, Eddie
2016-05-27  2:26   ` Lan Tianyu
2016-05-27  8:11     ` Tian, Kevin
2016-05-26 11:35 ` Andrew Cooper
2016-05-27  8:19   ` Lan Tianyu
2016-06-02 15:03     ` Lan, Tianyu
2016-06-02 18:58       ` Andrew Cooper
2016-06-03 11:01         ` Current PVH/HVMlite work and planning (was :Re: Discussion about virtual iommu support for Xen guest) Roger Pau Monne
2016-06-03 11:21           ` Tian, Kevin
2016-06-03 11:52             ` Roger Pau Monne
2016-06-03 12:11               ` Tian, Kevin
2016-06-03 16:56                 ` Stefano Stabellini
2016-06-07  5:48                   ` Tian, Kevin
2016-06-03 11:17         ` Discussion about virtual iommu support for Xen guest Tian, Kevin
2016-06-03 13:09           ` Lan, Tianyu
2016-06-03 14:00             ` Andrew Cooper
2016-06-03 13:51           ` Andrew Cooper
2016-06-03 14:31             ` Jan Beulich
2016-06-03 17:14             ` Stefano Stabellini
2016-06-07  5:14               ` Tian, Kevin
2016-06-07  7:26                 ` Jan Beulich
2016-06-07 10:07                 ` Stefano Stabellini
2016-06-08  8:11                   ` Tian, Kevin
2016-06-26 13:42                     ` Lan, Tianyu
2016-06-29  3:04                       ` Tian, Kevin
2016-07-05 13:37                         ` Lan, Tianyu
2016-07-05 13:57                           ` Jan Beulich
2016-07-05 14:19                             ` Lan, Tianyu
2016-08-17 12:05                             ` Xen virtual IOMMU high level design doc Lan, Tianyu
2016-08-17 12:42                               ` Paul Durrant
2016-08-18  2:57                                 ` Lan, Tianyu
2016-08-25 11:11                               ` Jan Beulich
2016-08-31  8:39                                 ` Lan Tianyu
2016-08-31 12:02                                   ` Jan Beulich
2016-09-01  1:26                                     ` Tian, Kevin
2016-09-01  2:35                                     ` Lan Tianyu
2016-09-15 14:22                               ` Lan, Tianyu
2016-10-05 18:36                                 ` Konrad Rzeszutek Wilk
2016-10-11  1:52                                   ` Lan Tianyu
2016-11-23 18:19                               ` Edgar E. Iglesias
2016-11-23 19:09                                 ` Stefano Stabellini
2016-11-24  2:00                                   ` Tian, Kevin
2016-11-24  4:09                                     ` Edgar E. Iglesias
2016-11-24  6:49                                       ` Lan Tianyu
2016-11-24 13:37                                         ` Edgar E. Iglesias
2016-11-25  2:01                                           ` Xuquan (Quan Xu) [this message]
2016-11-25  5:53                                           ` Lan, Tianyu
2016-10-18 14:14                             ` Xen virtual IOMMU high level design doc V2 Lan Tianyu
2016-10-18 19:17                               ` Andrew Cooper
2016-10-20  9:53                                 ` Tian, Kevin
2016-10-20 18:10                                   ` Andrew Cooper
2016-10-20 14:17                                 ` Lan Tianyu
2016-10-20 20:36                                   ` Andrew Cooper
2016-10-22  7:32                                     ` Lan, Tianyu
2016-10-26  9:39                                       ` Jan Beulich
2016-10-26 15:03                                         ` Lan, Tianyu
2016-11-03 15:41                                         ` Lan, Tianyu
2016-10-28 15:36                                     ` Lan Tianyu
2016-10-18 20:26                               ` Konrad Rzeszutek Wilk
2016-10-20 10:11                                 ` Tian, Kevin
2016-10-20 14:56                                 ` Lan, Tianyu
2016-10-26  9:36                               ` Jan Beulich
2016-10-26 14:53                                 ` Lan, Tianyu
2016-11-17 15:36                             ` Xen virtual IOMMU high level design doc V3 Lan Tianyu
2016-11-18 19:43                               ` Julien Grall
2016-11-21  2:21                                 ` Lan, Tianyu
2016-11-21 13:17                                   ` Julien Grall
2016-11-21 18:24                                     ` Stefano Stabellini
2016-11-21  7:05                               ` Tian, Kevin
2016-11-23  1:36                                 ` Lan Tianyu
2016-11-21 13:41                               ` Andrew Cooper
2016-11-22  6:02                                 ` Tian, Kevin
2016-11-22  8:32                                 ` Lan Tianyu
2016-11-22 10:24                               ` Jan Beulich
2016-11-24  2:34                                 ` Lan Tianyu
2016-06-03 19:51             ` Is: 'basic pci bridge and root device support. 'Was:Re: Discussion about virtual iommu support for Xen guest Konrad Rzeszutek Wilk
2016-06-06  9:55               ` Jan Beulich
2016-06-06 17:25                 ` Konrad Rzeszutek Wilk
2016-08-02 15:15     ` Lan, Tianyu
2016-05-27  8:35   ` Tian, Kevin
2016-05-27  8:46     ` Paul Durrant
2016-05-27  9:39       ` Tian, Kevin
2016-05-31  9:43   ` George Dunlap
2016-05-27  2:26 ` Yang Zhang
2016-05-27  8:13   ` Tian, Kevin

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