** Changed in: qemu
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1916112
Title:
Illegal instruction crash of QEMU on Jetson Nano
Status in QEMU:
Confirmed
Bug description:
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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