Xen ARM TODO: Difference between revisions
From Xen
Jump to navigationJump to search
(Removed fixed bgu) |
Juliengrall (talk | contribs) No edit summary |
||
| (12 intermediate revisions by 5 users not shown) | |||
| Line 3: | Line 3: | ||
== In progress == |
== In progress == |
||
== Known Bugs == |
|||
=== Versatile Express === |
|||
=== Arndale Board === |
|||
== Open Work Items == |
== Open Work Items == |
||
{{Open Project |
{{Open Project |
||
|Project= |
|Project=Save/restore and migration |
||
|Desc= |
|Desc= |
||
| ⚫ | |||
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=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= |
|Project=PCI device assignment to DomUs |
||
| ⚫ | |||
|Desc=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. |
|||
| ⚫ | |||
}} |
}} |
||
{{Open Project |
{{Open Project |
||
|Project= |
|Project=ITS support |
||
|Desc= |
|Desc= |
||
Physical and virtual ITS support for GICv3. |
|||
write a driver in Xen for the ARM System Memory Management Unit (SMMU), use it to assign devices to Dom0. |
|||
|References=Work underway: http://marc.info/?i=1426775889-29442-1-git-send-email-vijay.kilari%40gmail.com |
|||
}} |
}} |
||
{{Open Project |
{{Open Project |
||
|Project= |
|Project=More flexible early printk support |
||
|Desc=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= |
|References=http://lists.xen.org/archives/html/xen-devel/2014-02/msg01880.html |
||
}} |
}} |
||
{{Open Project |
{{Open Project |
||
|Project= |
|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 |
|||
Currently we use 4K pages everywhere. Xen should attempt to use 2MB mappings in the P2M wherever possible. |
|||
This will have significant performance benefits. |
|||
Need to do 2MB ballooning too. |
|||
}} |
|||
{{Open Project |
|||
|Project=Device assignment to DomUs |
|||
|Desc= |
|||
| ⚫ | |||
}} |
}} |
||
[[Category:XenARM]] |
|||
{{Open Project |
|||
|Project=Expose Wallclock time to guests |
|||
|Desc=Current Xen on ARM does not popular the wallclock time fields of the shared info with anything useful. It should do so... |
|||
}} |
|||
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 |
