From: Lan Tianyu <tianyu.lan@intel.com>
To: "Edgar E. Iglesias" <edgar.iglesias@gmail.com>,
"Tian, Kevin" <kevin.tian@intel.com>
Cc: "yang.zhang.wz@gmail.com" <yang.zhang.wz@gmail.com>,
"xuquan8@huawei.com" <xuquan8@huawei.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: Thu, 24 Nov 2016 14:49:41 +0800 [thread overview]
Message-ID: <f1f5ffa6-d047-fd20-8bd5-1d5f7aee444e@intel.com> (raw)
In-Reply-To: <20161124040903.GA9606@toto>
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.
>
> Another area that may need change is that on ARM we need the map-query to return
> the memory attributes for the given mapping. Today QEMU or any emulator
> doesn't use it much but in the future things may change.
>
> For SVM, whe will also need to deal with page-table faults by the IOMMU.
> So I think there will need to be a channel from Xen to Guesrt to report these.
Yes, vIOMMU should forward the page-fault event to guest. For VTD side,
we will trigger VTD's interrupt to notify guest about the event.
>
> For example, what happens when a guest assigned DMA unit page-faults?
> Xen needs to know how to forward this fault back to guest for fixup and the
> guest needs to be able to fix it and tell the device that it's OK to contine.
> E.g PCI PRI or similar.
>
>
--
Best regards
Tianyu Lan
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next prev parent reply other threads:[~2016-11-24 6:49 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 [this message]
2016-11-24 13:37 ` Edgar E. Iglesias
2016-11-25 2:01 ` Xuquan (Quan Xu)
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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