R-Car/Virtualization

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Revision as of 08:20, 10 January 2018 by Geert (talk | contribs) (Improve perfomance using KVM)
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Virtualization on Renesas R-Car Platforms

Prerequisites

  • QEMU (e.g. "apt-get install qemu-system-arm"),
  • A guest image, e.g. "openwrt-arm64-qemu-virt.Image" from OpenWRT.


Running QEMU

$ qemu-system-aarch64 -m 1024 -cpu cortex-a57 -M virt -nographic -kernel openwrt-arm64-qemu-virt.Image

and press <ENTER> to enjoy your new ARM64 system!


Using KVM

When using an arm64 platform as the host system, guest performance can be improved drastically by making use of the Kernel-based Virtual Machine (KVM).

Host Kernel Configuration

Make sure your host kernel has the following options enabled:

CONFIG_VIRTUALIZATION=y
CONFIG_KVM=y

"renesas_defconfig" should be fine.


Firmware Support

To use KVM, the firmware on your board must start Linux in hypervisor (EL2 / HYP) mode.

If your host kernel prints:

CPU: All CPU(s) started at EL2
...
kvm [1]: Hyp mode initialized successfully

during boot up, everything is fine.

If your host kernel prints:

CPU: All CPU(s) started at EL1
...
kvm [1]: HYP mode not available

during bootup, HYP mode is not available, and KVM cannot be used, unless you first replace the firmware of your board with a version that supports HYP mode.

TODO: Document trusted firmware upgrade, including 0001-Boot-Normal-World-in-EL2.patch

Running QEMU with KVM

$ qemu-system-aarch64 -enable-kvm -m 1024 -cpu cortex-a57 -M virt -nographic -kernel openwrt-arm64-qemu-virt.Image

and press <ENTER> to enjoy a faster new ARM64 system!