On Wed, Mar 15, 2017 at 07:50:36PM -0400, Yasutaka, T wrote: > Hi Christopher and other KVM/ARM community members, > > I tried the following QEMU and Kernel combinations on Raspberry Pi 3 > (AArch64 mode) but failed: > > Latest commit of Alexander Graf's no-kvm-irqchip QEMU branch: > https://github.com/agraf/qemu/tree/no-kvm-irqchip > > raspberrypi/linux's rpi-4.10.y branch (forked from Linux 4.10-rc8?) latest > commit bb0ff9d059c67e1611c7422f7982a6a4876efe67 > patched by $(git diff (linux 4.10-rc5 commit > 7a308bb3016f57e5be11a677d15b821536419d36) (Christpher's irqs-to-user-v2 > latest commit d0a7cc725535df1b9cc64b442d246c20a9edb904) ) > > and got the following error: > > pi@raspberrypi:~/os/graf/no-kvm-irqchip/aarch64-softmmu $ > qemu-system-aarch64 --enable-kvm -M virt > "kvm" accelerator not found. > No accelerator found! You'd need "-machine virt,kernel_irqchip=off" to use the userspace GIC emulation. Perhaps QEMU's error message for trying to initialize the in-kernel GIC is just weird. > > pi@raspberrypi:~/os/graf/no-kvm-irqchip/aarch64-softmmu $ lkvm run test > # lkvm run -k test -m 448 -c 4 --name guest-1605 > Error: Unsupported KVM extension detected: KVM_CAP_IRQCHIP > Fatal: Failed to create virtual GIC I don't think kvmtool supports running on a system that doesn't have in-kernel GIC support. > > > which seems strange for me because dmesg shows kernel is 4.10.2-v8+ and > Boot CPU is AArach64, all CPUs are initialized in HYP mode and /dev/kvm > exists. So I thought GIC emulation is also enabled, or should I need to > enable other config flags or do settings? The RPI3 doesn't have a GIC, so you'll never get KVM emulation of the GIC with that board. Ever. That's why you want the irqchip in userspace patches. > Or, is this way of applying patch > wrong? Current config.gz is: > https://gist.github.com/caprice-j/d6e144cb8727df813a4fbe716beac3cb > > My other concerns are no kvm-ok command is available and /proc/cpuinfo does > not show flags for virtualization support (I believe RPI3's cortex A53 > (ARMv8) has builtin virt support and does not show the support flag > explicitly in /proc/cpuinfo ... but I'm unsure that is true) If you have /dev/kvm then KVM as such is running on your system, no need to worry further, just fix your setup to emulate the GIC in userspace. Thanks, -Christoffer _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
