[Qemu-devel] [Query] Does Linux & Qemu support KVM for ARM32 guest on AR
RAVINDRA KUMAR SANDE
[Qemu-devel] [Query] Does Linux & Qemu support KVM for ARM32 guest on ARM64 host
Thu, 28 Apr 2016 01:50:09 +0000 (GMT)
What I did : 1) Just for investigation, I took a ARMv8 ( OdroidC2 ) board 2) I compiled Linux 3.14 with KVM support for this ARMv8 ( OdroidC2 ) board, with modification replacing meson_timer by arm timer in its dts file. Why Linux 3.14 : I took Linux 3.14 because display drivers for this board are officially for this version; and I am interested in seeing some Linux guest booting with display on. 3) I see from boot log of that KVM is initialized successfully, and I can see /dev/kvm node. 4) I built latest Qemu with --enable-kvm on this board natively.
What I find : 1) running "qemu-system-arm -enable-kvm -machine vexpress-a9 ...." gives error : no accelerator found 2) running "qemu-system-aarch64 -enable-kvm -machine vexpress-a9 ...." gives error : kmv_init_vcpu (IOCtl on /dev/kvm) failed, guest not supported ( I experimented some modifications as well to overcome above error, such as replacing value assigned to cpu->kvm_target etc, but IOCtl call is failing)
Query: 1) Does Arm64 Linux not enable KVM support for Arm32 guest ? 2) Can qemu-system-arm not use the KVM feature on Arm64 host ? 3) Can qemu-system-aarch64 not use KVM feature for Arm32 guest ?
Thanks, Ravindra Sande PS : Please also point out the possibility ( already done, not done but possible or impossible ) in answer of each of above queries.