LCU14 BURLINGAME

A. Bennée, C. Dall & P. Maydell, LCU14

LCU14-106: QEMU for ARMv8 and the 64-bit Android Emulator

● ARMv8-A Instruction Set Support - Upstream January 2014● Provides User Mode Emulation

● Includes ARMv8 AArch32 extensions, AArch32 crypto instructions, and ARMv8 NEON support

● System Mode Emulation - Upstream March 2014● ARMv8 Debug Architecture - in the works● TCG PSCI Support - patches from Ard Biesheuvel on list (originally

from Rob Herring)

QEMU ARMv8 State of the union

● Really old fork of QEMU● Heavily modified by Google● Backporting ARMv8-A support is a

huge pain● Defines a “Goldfish” board:

● ADB Pipe (a.k.a. QEMU Pipe)● GPU Emulation● Skinning● Emulated battery● Emulated sensors● Android Console● ADB backend

The Android Emulator

● A new Goldfish● Based on -M virt

● Uses Virtio where it can (block, net)

● ADB Pipe

● ADB backend

● Android Console based on QEMU Monitor

Ranchu - 64-bit Android on QEMU

● Working with Google on basing new Android Emulator on upstream QEMU, using Ranchu as base

● Working on Ranchu-based 32-bit Android support as well

● Benefit from future additions to QEMU (like TrustZone)

● Linaro to complete the initial prototype (screen rotation, full Android console, …)

● Plans to send RFC patch set upstream

● Google is working on GPU support and skinning

Ranchu - Future Plans

● Anything unanswered?

● Questions?

QEMU ARMv8 - Questions and discussions

QEMU ARMv8: A practical guide● ARMv8 Models

● Virt I/O based (block, net, fs, char), Serial UART, RTC, Flash● Very Simple Example

● You can use modern mainline kernel, no patches required● ARCH=arm64 make defconfig + aarch64 initrd userspace

qemu-system-aarch64 -machine virt -cpu cortex-a57 -nographic -smp 1 -m 2048 -kernel ../linux.git/arch/arm64/boot/Image --append "console=ttyAMA0"

● Adding VIRT-IO features● CONFIG_VIRT_DRIVERS, CONFIG_VIRTIO_*, CONFIG_NET_9P_VIRTIO● Together with a rootfs on a block device (any standard FS)

qemu-system-aarch64 -machine virt -cpu cortex-a57 -machine type=virt -nographic -smp 1 -m 2048 -kernel ../linux.git/arch/arm64/boot/Image --append "console=ttyAMA0 root=/dev/vda debug=vc" -drive file=../rootfs/ubuntu-trusty.img,id=myblock,index=0 -device virtio-blk-device,drive=myblock -netdev user,id=unet -device virtio-net-device,netdev=unet

● Not upstream, you will need● Custom kernel● Patched AOSP tree● Beta branch of the QEMU git tree

● See the fine blog post:● http://www.linaro.org/blog/core-dump/running-64bit-android-l-qemu/

64 Bit Android Emulator

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