Xen ARM TODO: Difference between revisions

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== In progress ==
== In progress ==

* Xen 64-bit guests support: http://marc.info/?l=xen-devel&m=136310027317761 by Ian Campbell
* Xen SMP: http://marc.info/?l=xen-devel&m=136256023123214 by Ian Campbell
* Xen guest SMP support: http://marc.info/?l=xen-devel&m=136430925010828 by Stefano Stabellini
* Linux SMP on Xen: http://marc.info/?l=linux-kernel&m=136430893610688&w=2 by Stefano Stabellini
* trap WFI in Xen: http://marc.info/?l=xen-devel&m=136492132108133 by Stefano Stabellini
* Remove hardcoded numbers and addresses in Xen, use device tree for everything. This enables a single Xen binary to boot on multiple platforms (Julien Grall).


== Known Bugs ==
* Hangs on the Arndale boards with multi-vcpu guests: [http://marc.info/?l=xen-devel&m=136510786507930| fix] by Julien Grall



== Open Work Items ==
== Open Work Items ==


{{Open Project
{{Open Project
|Project=IOMMU support in Xen
|Project=Save/restore and migration
|Desc=
|Desc=
⚫
Make VM save/restore and VM migration work on ARM.
write a driver in Xen for the ARM System Memory Management Unit (SMMU), use it to assign devices to Dom0.
|References=An initial prototype was written a couple of years ago for arm32 but never completed: http://lists.xen.org/archives/html/xen-devel/2014-06/msg02076.html
}}
}}


{{Open Project
{{Open Project
|Project=Autogenerate DomU's device trees
|Project=PCI device assignment to DomUs
|Desc=
|Desc=
⚫
Assign one or more devices to an unprivileged guest, re-program the SMMU accordingly.
Xen or the Xen tools (ie. XL) should be able to generate the device tree for the guest automatically.
}}
}}


{{Open Project
{{Open Project
|Project=Linux 64-bit on Xen
|Project=ITS support
|Contact=Stefano Stabellini <stefano.stabellini@eu.citrix.com>
|Desc=
|Desc=
Physical and virtual ITS support for GICv3.
Introduce Xen support for ARMv8 in Linux.
|References=Work underway: http://marc.info/?i=1426775889-29442-1-git-send-email-vijay.kilari%40gmail.com
}}
}}


{{Open Project
{{Open Project
|Project=Save/restore and migration
|Project=More flexible early printk support
|Desc=Allow a single Xen binary to support multiple platforms for early_printk
|Desc=
Rather than parsing the DTB early in asm to get the command line it would probably be sufficient to have a magic hex byte at a specific offset which could be edited by a simple tool.
⚫
Make VM save/restore and VM migration work on ARM.
|References=http://lists.xen.org/archives/html/xen-devel/2014-02/msg01880.html
}}
}}

{{Open Project
{{Open Project
|Project=Device assignment to DomUs
|Project=Investigation on HCR.FB
|Desc=Setting HCR.FB will upgrade local flush instructions (TLB, instruction cache, branch predictor) to innershareable. It would be nice to benchmark the performance impact on a UP-aware kernel and see if this could be reduced by flushing when a vCPU is migrating to another physical CPUs.
|Desc=
|References=http://lists.xen.org/archives/html/xen-devel/2016-04/msg03157.html
⚫
Assign one or more devices to an unprivileged guest, re-program the SMMU accordingly.
}}
}}

[[Category:XenARM]]

Latest revision as of 10:22, 27 April 2016

This is a list of open work items and known bugs for the Xen on ARM with virtualization extension project.


In progress

Open Work Items

Save/restore and migration
Contact: xen-devel@lists.xen.org
Description: Make VM save/restore and VM migration work on ARM.
References: An initial prototype was written a couple of years ago for arm32 but never completed: http://lists.xen.org/archives/html/xen-devel/2014-06/msg02076.html

PCI device assignment to DomUs
Contact: xen-devel@lists.xen.org
Description: Assign one or more devices to an unprivileged guest, re-program the SMMU accordingly.
References: Not specified, useful references.

ITS support
Contact: xen-devel@lists.xen.org
Description: Physical and virtual ITS support for GICv3.
References: Work underway: http://marc.info/?i=1426775889-29442-1-git-send-email-vijay.kilari%40gmail.com

More flexible early printk support
Contact: xen-devel@lists.xen.org
Description: Allow a single Xen binary to support multiple platforms for early_printk Rather than parsing the DTB early in asm to get the command line it would probably be sufficient to have a magic hex byte at a specific offset which could be edited by a simple tool.
References: http://lists.xen.org/archives/html/xen-devel/2014-02/msg01880.html

Investigation on HCR.FB
Contact: xen-devel@lists.xen.org
Description: Setting HCR.FB will upgrade local flush instructions (TLB, instruction cache, branch predictor) to innershareable. It would be nice to benchmark the performance impact on a UP-aware kernel and see if this could be reduced by flushing when a vCPU is migrating to another physical CPUs.
References: http://lists.xen.org/archives/html/xen-devel/2016-04/msg03157.html
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