Hi Andreas, Thank you for the detailed reply.
I have added myself to the kvm group, so that I don’t need to use the sudo. I have also tried the ARM big.Little configuration example, but I still get Errno 19. Now will try to update the Kernel so and will also try to run VM with KVM so to check if the KVM is working on the machine or not. I will keep posted on how it goes. Thank you again. Regards Yasir From: gem5-users [mailto:gem5-users-boun...@gem5.org] On Behalf Of Andreas Sandberg Sent: 25 October 2017 16:04 To: gem5 users mailing list <gem5-users@gem5.org> Subject: Re: [gem5-users] ARM v8 KVM - GEM5 Hi Yasir, The reason you have to sudo to get access to the device is because most Linux distributions restrict access to /dev/kvm. You can change the permissions manually or add yourself to the relevant groups (the group is probably called kvm or something along those lines). Errno 19 corresponds to ENODEV. I'm not sure why you'd get that when you try to create a VM, it might be because KVM isn't supported properly on your platform. I'd suggest that you try to get qemu or virt-tools to work with KVM on your system before you try to run gem5 with KVM. You'll most likely have to update your host kernel since 4.4 is too old to work reliably with KVM, you probably need at least 4.9 to get it to work at all. Also, please keep in mind that example/fs.py doesn't support mutli-core KVM. If you need that, you have to use the bL example configuration in example/arm/. Another limitation is that you can't (easily) use gem5's GIC extensions, so you are currently limited to 8 CPUs. Cheers, Andreas On 19/10/2017 17:23, Qureshi Yasir Mahmood wrote: Hi All, Any idea why the ARM KVM model is not running in the following, please ? If I need to debug this, can someone suggest what debug flags should I be looking out for ? Thank you Regards Yasir From: gem5-users [mailto:gem5-users-boun...@gem5.org] On Behalf Of Qureshi Yasir Mahmood Sent: 18 October 2017 16:07 To: gem5-users@gem5.org<mailto:gem5-users@gem5.org> Subject: [gem5-users] ARM v8 KVM - GEM5 Hi All, I am trying to use the ARMv8 KVM CPU model in FS mode. My gem5 is compiled and running on Cavium ThunderX machine (ARMv8 architecture). When I run the following without any sudo, ./build/ARM/gem5.fast --remote-gdb-port=0 -d kvzr/kvzr_base configs/example/fs.py --kernel=vmlinux --machine-type=VExpress_GEM5_V1 --dtb-file=/home/epfl/gem5/system/arm/dt/armv8_gem5_v1_16cpu.dtb --disk-image=test_kvzr.img -n 16 --cpu-clock=2GHz --caches --l2cache --l1i_size=64kB --l1d_size=32kB --l1i_assoc=2 --l1d_assoc=2 --l2_size=16MB --l2_assoc=16 --mem-type=DDR4_2400_4x16 --mem-ranks=4 --mem-size=16GB --sys-clock=1600MHz --cpu-type=ArmV8KvmCPU fatal: KVM: Failed to open /dev/kvm Memory Usage: 87808 Kbytes If I put a sudo just at the start of the command, the error is as follows Global frequency set at 1000000000000 ticks per second info: kernel located at: /home/epfl/full_system_images/binaries/vmlinux warn: Highest ARM exception-level set to AArch32 but bootloader is for AArch64. Assuming you wanted these to match. panic: KVM: Failed to create device (errno: 19) Memory Usage: 17142380 KBytes Program aborted at tick 0 --- BEGIN LIBC BACKTRACE --- ./build/ARM/gem5.fast(_Z15print_backtracev+0x38)[0x18f1498] ./build/ARM/gem5.fast(_Z12abortHandleri+0x5c)[0x18fe8d4] [0xffff9b0ec510] /lib/aarch64-linux-gnu/libc.so.6(gsignal+0x38)[0xffff9a7e94e8] --- END LIBC BACKTRACE --- Aborted I ran kvm-ok, and the output was the following INFO: /dev/kvm exists KVM acceleration can be used My host kernel version is 4.4 and the simulated kernel version is 4.3 Any ideas, why KVM CPU model is not running on for ARM FS ? Regards Yasir _______________________________________________ gem5-users mailing list gem5-users@gem5.org<mailto:gem5-users@gem5.org> http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.
_______________________________________________ gem5-users mailing list gem5-users@gem5.org http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users
