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authorChristian Krinitsin <mail@krinitsin.com>2025-06-30 12:34:26 +0000
committerChristian Krinitsin <mail@krinitsin.com>2025-06-30 12:35:44 +0000
commit25f8033d556aa17afaea4a5196ea7a69fe248320 (patch)
tree0f056db167683be54ea1e5e72d29d6069af55e7d /results/classifier/deepseek-2-tmp/output/hypervisor/1916112
parent8e6da29e4ee5fc14bc1cc816a24f21271f14090d (diff)
downloadqemu-analysis-25f8033d556aa17afaea4a5196ea7a69fe248320.tar.gz
qemu-analysis-25f8033d556aa17afaea4a5196ea7a69fe248320.zip
add new temporary deepseek-r1:14b results
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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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