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-
-Illegal instruction crash of QEMU on Jetson Nano
-
-I have a jetson nano (arm64 SBC) and I want to check the native emulation performance of Raspbian Buster. I used the info available here:
-
-https://github.com/dhruvvyas90/qemu-rpi-kernel/tree/master/native-emuation
-
-I have Xubuntut 20.04 with KVM enabled kernel running on the Jetson Nano
-
-However QEMU crashes with "Illegal Instruction" during kernel boot. I have a built latest QEMU from sources with following configuration
-
-./configure --prefix=/usr/local --target-list=aarch64-softmmu,arm-softmmu  --enable-guest-agent --enable-vnc  --enable-vnc-jpeg --enable-vnc-png --enable-kvm --enable-spice --enable-sdl --enable-gtk --enable-virglrenderer --enable-opengl
-
-qemu-system-aarch64 --version
-QEMU emulator version 5.2.50 (v5.2.0-1731-g5b19cb63d9)
-
-When I run as follows:
-
-../build/qemu-system-aarch64 -M raspi3
--append "rw earlyprintk loglevel=8 console=ttyAMA0,115200 dwc_otg.lpm_enable=0 root=/dev/mmcblk0p2 rootdelay=1"
--dtb ./bcm2710-rpi-3-b-plus.dtb
--sd /media/96747D21747D0571/JetsonNano/2020-08-20-raspios-buster-armhf-full.qcow2
--kernel ./kernel8.img
--m 1G -smp 4 -serial stdio -usb -device usb-mouse -device usb-kbd
-
-I get :
-[ 74.994834] systemd[1]: Condition check resulted in FUSE Control File System being skipped.
-[ 76.281274] systemd[1]: Starting Apply Kernel Variables...
-Starting Apply Kernel Variables...
-Illegal instruction (core dumped)
-
-When I use GDB I see this:
-
-Thread 8 "qemu-system-aar" received signal SIGILL, Illegal instruction.
-[Switching to Thread 0x7fad7f9ba0 (LWP 28037)]
-0x0000007f888ac690 in code_gen_buffer ()
-(gdb) bt
-#0 0x0000007f888ac690 in code_gen_buffer ()
-#1 0x0000005555d7c038 in cpu_tb_exec (tb_exit=, itb=, cpu=0x7fb4502c40)
-at ../accel/tcg/cpu-exec.c:191
-#2 cpu_loop_exec_tb (tb_exit=, last_tb=, tb=, cpu=0x7fb4502c40)
-at ../accel/tcg/cpu-exec.c:708
-#3 cpu_exec (cpu=cpu@entry=0x7fb4502c40) at ../accel/tcg/cpu-exec.c:819
-..
-
-I have just two questions:
-
-Is this a problem with QEMU or is there anything specific build or options I need to use. Any specific version of QEMU should be used ?
-
-Why is TCG used as the accelerator when KVM is present. Is it possible and how to use KVM ?
-
-If I enabled the KVM then I get this error:
-
-../build/qemu-system-aarch64 -M raspi3 -enable-kvm -append "rw earlyprintk loglevel=8 console=ttyAMA0,115200 dwc_otg.lpm_enable=0 root=/dev/mmcblk0p2 rootdelay=1" -dtb ./bcm2710-rpi-3-b-plus.dtb -sd /media/96747D21747D0571/JetsonNano/2020-08-20-raspios-buster-armhf-full.qcow2 -kernel ./kernel8.img -m 1G -smp 4 -serial stdio -usb -device usb-mouse -device usb-kbd
-WARNING: Image format was not specified for '/media/96747D21747D0571/JetsonNano/2020-08-20-raspios-buster-armhf-full.img' and probing guessed raw.
-         Automatically detecting the format is dangerous for raw images, write operations on block 0 will be restricted.
-         Specify the 'raw' format explicitly to remove the restrictions.
-qemu-system-aarch64: ../softmmu/physmem.c:750: cpu_address_space_init: Assertion `asidx == 0 || !kvm_enabled()' failed.
-
-Thanks a lot.
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