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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next prev parent 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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