Xen ARM TODO: Difference between revisions
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|Desc= |
|Desc= |
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Make VM save/restore and VM migration work on ARM. |
Make VM save/restore and VM migration work on ARM. |
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|References=An initial prototype was written a couple of years ago for arm32 but never completed: http://lists.xen.org/archives/html/xen-devel/ |
|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 |
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Physical and virtual ITS support for GICv3. |
Physical and virtual ITS support for GICv3. |
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|References=Work underway: http://marc.info/?i=1426775889-29442-1-git-send-email-vijay.kilari%40gmail.com |
|References=Work underway: http://marc.info/?i=1426775889-29442-1-git-send-email-vijay.kilari%40gmail.com |
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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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|References=Partial/incomplete code http://article.gmane.org/gmane.comp.emulators.xen.devel/220265 |
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{{Open Project |
{{Open Project |
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|Project= |
|Project=Investigation on HCR.FB |
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|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. |
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|Desc=ePAPR 1.1 3.5 defines the /chosen/stdout-path property which contains the path to the serial device as a string. |
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|References=http://lists.xen.org/archives/html/xen-devel/2016-04/msg03157.html |
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We could potentially make two uses of this: |
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* ''DONE'' Xen itself could use this property if it is present to set the default dtuart= option, saving users the hassle. |
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* We could pass a suitable /chosen/stdout-path to dom0 to cause it to use hvc0 by default. This needs thinking through since hvc0 doesn't itself have a dt node. |
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** Probably not necessary for Linux after http://article.gmane.org/gmane.linux.ports.arm.kernel/393828 happens, although perhaps useful for other OSes |
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|References=https://www.power.org/documentation/epapr-version-1-1/ https://git.kernel.org/linus/a208ffd251d08ed7ba6bdf3ae1e423373fb12d3d https://git.kernel.org/linus/3482f2c52b77bf6596e24aae82e204a0603eba66 |
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{{Open Project |
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|Project=VCPU virtual time support |
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|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. |
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|References=A patch series was sent to the LKML but never fully upstreamed: http://marc.info/?l=linux-arm-kernel&m=138929238127454&w=2 |
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}} |
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[[Category:XenARM]] |
[[Category:XenARM]] |
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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 |
