Difference between revisions of "Xen ARM TODO"

From Xen
(vGIC priorities and VCPU virtual time)
(bootwrapper + wallclock)
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Assign one or more devices to an unprivileged guest, re-program the SMMU accordingly.
 
Assign one or more devices to an unprivileged guest, re-program the SMMU accordingly.
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{{Open Project
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|Project=Bootwrapper support for systems with non-HYP mode aware bootloaders and platform quirks
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|Desc=Currently Xen includes (in mode_switch.S, called from head.S) various workarounds for platforms which do not start the hypervisor in HYP mode and to initialise various board level values (either because when running on the model there is no firmware to do this or because the board firmware is buggy). In order to maintain the clean separation of such hacks from the main Xen code base and to achieve the single image goal this platform specific code should be extracted into a separate boot-wrapper project, similar to http://xenbits.xen.org/gitweb/?p=people/ianc/boot-wrapper.git;a=summary which can be used on the Fast Models.
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{{Open Project
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|Project=Expose Wallclock time to guests
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|Desc=Current Xen on ARM does not popular the wallclock time fields of the shared info with anything useful. It should do so...
 
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Revision as of 09:59, 1 May 2013

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


In progress


Known Bugs

Versatile Express

linux v3.8-rc2 boot failed on versatile express
Contact: xen-devel@lists.xen.org
Status: Fixed
Description: Linux v3.8-rc2 fails to change the MMC voltage during boot on Versatile Express.
References: patch is needed to fix the bug.

Arndale Board

Guest hang with multi-vcpu
Contact: xen-devel@lists.xen.org
Status: Fixed
Description: Hangs on the Arndale board with multi-vcpu guests.
References: patch is needed to fix the bug.

Network doesn't work in the guest
Contact: julien.grall@citrix.com
Status: In progress
Description: Network doesn't work in the guest when an ehternet cable is plugged
References: http://pastebin.com/gEP3HdCg

Sometimes Guest can't extract the initramfs
Contact: xen-devel@lists.xen.org
Status: Open
Description: When Xen tries to copy data from the guest, it fails to unmap some page because nobody(?) mapped it.
References: http://pastebin.com/frbeiuxz


Open Work Items

vGIC interrupt prioritisation
Contact: xen-devel@lists.xen.org
Description: Currently the vGIC only implements a very basic form of interrupt priority, in particular it is not able to preempt an inflight lower priority interrupt when a new higher priority one occurs. The emulation needs to consider the vCPUs current IAR as well as the priorities of pending and inflight interrupts.
References: Not specified, useful references.

VCPU virtual time support
Contact: xen-devel@lists.xen.org
Description: Currently the concept of virtual time exposed to the guests is very simplistic and is just a static offset from physical time based on the time when the guest was started. We need to consider if this is actually what is needed/wanted and consider cases such as stolen time etc.
References: Not specified, useful references.

IOMMU support in Xen
Contact: xen-devel@lists.xen.org
Description: write a driver in Xen for the ARM System Memory Management Unit (SMMU), use it to assign devices to Dom0.
References: Not specified, useful references.

Autogenerate DomU's device trees
Contact: xen-devel@lists.xen.org
Description: Xen or the Xen tools (ie. XL) should be able to generate the device tree for the guest automatically.
References: Not specified, useful references.

Linux 64-bit on Xen
Contact: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Description: Introduce Xen support for ARMv8 in Linux.
References: Not specified, useful references.

Save/restore and migration
Contact: xen-devel@lists.xen.org
Description: Make VM save/restore and VM migration work on ARM.
References: Not specified, useful references.

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.

Bootwrapper support for systems with non-HYP mode aware bootloaders and platform quirks
Contact: xen-devel@lists.xen.org
Description: Currently Xen includes (in mode_switch.S, called from head.S) various workarounds for platforms which do not start the hypervisor in HYP mode and to initialise various board level values (either because when running on the model there is no firmware to do this or because the board firmware is buggy). In order to maintain the clean separation of such hacks from the main Xen code base and to achieve the single image goal this platform specific code should be extracted into a separate boot-wrapper project, similar to http://xenbits.xen.org/gitweb/?p=people/ianc/boot-wrapper.git;a=summary which can be used on the Fast Models.
References: Not specified, useful references.

Expose Wallclock time to guests
Contact: xen-devel@lists.xen.org
Description: Current Xen on ARM does not popular the wallclock time fields of the shared info with anything useful. It should do so...
References: Not specified, useful references.