Hello KVM/ARM community,
I am now trying to execute KVM on Raspberry Pi 3 Model B (RPI3).
Does anyone know whether KVM/ARM can run with 32-bit mode on ARM Cortex A53?
The CPU of RPI3 is ARM Cortex A53 which can be executed in both 32-bit and 64-bit mode. I've managed to display /dev/kvm on 64-bit mode execution (i.e. with a 64-bit linux kernel) on RPI3, but I failed to do so in 32-bit mode.
In 32-bit mode, an KVM error messages says CPU not supported. I guess the reason for the error message is KVM_ARM_TARGET_CORTEX_A53 is only returned in /arch/arm64/kvm/guest.c not under/arch/arm/kvm/guest.c.
So I'm wondering whether it's possible or not. What I'd like to do is to compare the execution speed of KVM between 32-bit and 64-bit mode. The second plan is to compare between KVMs of 32-bit RPI2 and 64-bit RPI3 (I have both), but since RPI2 spec is a little low and I'm worried that some numeric comparisons become unfair.
(I was also notified by an KVM/ARM expert that since RPI doesn't have a GIC and I need to apply some patches)
The 64-bit kernel I used is the official RPI3 one here: https://github.com/raspberrypi/linux
I compiled after make bcmrpi3_defconfig config: https://github.com/raspberrypi/linux/blob/rpi-4.9.y/arch/arm64/configs/bcmrpi3_defconfig
Best regards,
Yasutaka Tanaka
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