Xen ARM with Virtualization Extensions/Salvator-X: Difference between revisions

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== General information ==
The Salvator-X board based on Renesas R-Car H3 SoC is now supported in Xen upstream.


This wiki describes how to run XEN on Renesas Salvator-X board with R-Car H3 SoC.
= Build approaches =


Due to the fact that Renesas provide their reference software in form of [http://elinux.org/index.php?title=R-Car/Boards/Yocto-Gen3&oldid=446036 Yocto build instruction], it is provided additional steps in order to add XEN to the system being built. Those steps add meta-virtualization layer and a glue layer to the Yocto build.
There is 2 possible ways to build Xen for this board:


XEN hypervisor is taken from a master branch of [http://xenbits.xen.org/gitweb/?p=xen.git xen.git].
* Yocto build
* Bulding without buildsystem


This wiki relies on Renesas Yocto version [http://elinux.org/index.php?title=R-Car/Boards/Yocto-Gen3&oldid=446036 2.19.0].
== Yocto Build ==


== Known limitations ==
Follow setup are based & tested on official Renesas Yocto 2.12.0 release (https://github.com/renesas-rcar/meta-renesas/releases/tag/Renesas-Yocto-v2.12.0)


Due to different XEN specifics there is a list of system deviations from Renesas'es reference software:


* ATF exits to bootloader in EL2 mode
# Clone your Renesas build as described in Yocto Reference Manual.
* TEE client is not functional
# Clone additional repository in the same directory
* reserved memory is not supported
#: <pre> https://github.com/qbeeukraine/meta-platform-xen.git </pre>
* adsp, mmngr, mmngrbuf are dropped because they rely on reserved memory
# Initialize yocto build environment
#: <pre> source poky/oe-init-build-env </pre>
# Copy local.conf & bblayers.conf from supplied xen layer
#: <pre> cp meta-platform-xen/meta-rcar-gen3-xen/doc/*.conf ./conf/ </pre>


Because of the fact that Renesas BSP u-boot uses cli-simple, adequate manual updating of fdt is not possible. So within the glue layer it is provided a [https://github.com/xen-troops/meta-demo/blob/master/meta-rcar-gen3-xen/recipes-kernel/linux/linux-renesas/r8a7795-salvator-x-xen.dts device tree] with changes required for XEN.
== Bulding without buildsystem ==


Please consider changes to dts and appropriate dtb load in case you want system configuration changes (i.e. nfs server ip, dom0 root option, xen command line, etc.)
(TBD)


== System build ==
= Check u-boot environment variables =


* Follow the [http://elinux.org/index.php?title=R-Car/Boards/Yocto-Gen3&oldid=446036 instruction] to the system build step 10, including it.
Set follow configuration in u-boot command prompt.


* Add meta-virtualization layer with its dependencies:
<pre>
git clone git://git.yoctoproject.org/meta-virtualization -b morty ../meta-virtualization
bootargs=dom0_mem=512M console=dtuart dtuart=serial0 dom0_max_vcpus=1 bootscrub=0 flask_enforcing=1
bitbake-layers add-layer ../meta-virtualization
bootcmd=tftp 0x78080000 xen-salvator-x-xen.uImage; tftp 0x738000000 Image-r8a7795-salvator-x-dom0.dtb; tftp 0x7a000000 Image; tftp 0x7c000000 xenpolicy-salvator-x-xen; bootm 0x78080000 - 0x738000000
git clone git://git.yoctoproject.org/meta-selinux -b jethro ../meta-selinux
</pre>
bitbake-layers add-layer ../meta-selinux
bitbake-layers add-layer ../meta-openembedded/meta-networking
bitbake-layers add-layer ../meta-openembedded/meta-python

* Add the glue layer
git clone https://github.com/xen-troops/meta-demo -b master ../meta-demo
bitbake-layers add-layer ../meta-demo/meta-rcar-gen3-xen

* Continue build steps from [http://elinux.org/index.php?title=R-Car/Boards/Yocto-Gen3&oldid=446036 instruction]

== BL2 & U-boot update procedure ==

It is crucial to update ATF on the board in order to get XEN start in EL2.

Please follow your board manual to find out ATF update procedure.

== Running the system ==

Setup tftp and nfs as described in [http://elinux.org/index.php?title=R-Car/Boards/Yocto-Gen3&oldid=446036#Running_Yocto_images instruction].

Please consider that default expected nfs server setup is ''nfsroot=192.168.1.100:/srv/dom0''.

For the system boot issue from u-boot cli:

setenv bootargs #empties the bootargs added by u-boot
tftp 0x48000000 Image-r8a7795-salvator-x-xen.dtb
tftp 0x48080000 xen-salvator-x.uImage
tftp 0x7a000000 Image
bootm 0x48080000 - 0x48000000


[[Category:XenARM]]
[[Category:XenARM]]
⚫
[[Category:Yocto]]
[[Category:Developers]]
[[Category:Developers]]
⚫
[[Category:Xen 4.7]]
[[Category:Xen 4.8]]

Latest revision as of 16:43, 14 July 2017

General information

This wiki describes how to run XEN on Renesas Salvator-X board with R-Car H3 SoC.

Due to the fact that Renesas provide their reference software in form of Yocto build instruction, it is provided additional steps in order to add XEN to the system being built. Those steps add meta-virtualization layer and a glue layer to the Yocto build.

XEN hypervisor is taken from a master branch of xen.git.

This wiki relies on Renesas Yocto version 2.19.0.

Known limitations

Due to different XEN specifics there is a list of system deviations from Renesas'es reference software:

  • ATF exits to bootloader in EL2 mode
  • TEE client is not functional
  • reserved memory is not supported
  • adsp, mmngr, mmngrbuf are dropped because they rely on reserved memory

Because of the fact that Renesas BSP u-boot uses cli-simple, adequate manual updating of fdt is not possible. So within the glue layer it is provided a device tree with changes required for XEN.

Please consider changes to dts and appropriate dtb load in case you want system configuration changes (i.e. nfs server ip, dom0 root option, xen command line, etc.)

System build

  • Follow the instruction to the system build step 10, including it.
  • Add meta-virtualization layer with its dependencies:
   git clone git://git.yoctoproject.org/meta-virtualization -b morty ../meta-virtualization
   bitbake-layers add-layer ../meta-virtualization
   git clone git://git.yoctoproject.org/meta-selinux -b jethro ../meta-selinux
   bitbake-layers add-layer ../meta-selinux
   bitbake-layers add-layer ../meta-openembedded/meta-networking
   bitbake-layers add-layer ../meta-openembedded/meta-python
  • Add the glue layer
   git clone https://github.com/xen-troops/meta-demo -b master ../meta-demo
   bitbake-layers add-layer ../meta-demo/meta-rcar-gen3-xen

BL2 & U-boot update procedure

It is crucial to update ATF on the board in order to get XEN start in EL2.

Please follow your board manual to find out ATF update procedure.

Running the system

Setup tftp and nfs as described in instruction.

Please consider that default expected nfs server setup is nfsroot=192.168.1.100:/srv/dom0.

For the system boot issue from u-boot cli: 

   setenv bootargs #empties the bootargs added by u-boot
   tftp 0x48000000 Image-r8a7795-salvator-x-xen.dtb
   tftp 0x48080000 xen-salvator-x.uImage
   tftp 0x7a000000 Image
   bootm 0x48080000 - 0x48000000
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