Hello, I am doing research with Linux Power Management interactions with USB
devices. Which is why I would like to be able to wake the vm from suspend with
a passed through USB device. I have been able to pass through the usb device
from the launch command and enable the wakeup file with a udev rule for the
/sys/bus/usb/devices/usb#/power/wakeup file. But the issue is that the actual
device's wakeup files are missing (/sys/bus/usb/devices/#-#/power/wakeup).
These files are present on my linux host where the keyboard wakes the host from
suspend just fine. I know that these files come from the gadget's bmAttribute
byte having the correct bits set to inform the host that it can perform remote
wakeup. Since these files originate from that low of a level, is this even a
problem with my qemu configuration or is this something that is even supported
by qemu's usb passthrough?
I have also been able to suspend the vm and wake it from the qemu shell using
system_wake so I know that the vm wakes properly. I have also seen old posts
about using evdev to pass through usb devices, but this seems to be old and not
the best method.
Here are the details of my configuration:
Launch Script:
qemu-system-x86_64 \
-m 2G \
-smp 2 \
-kernel /home/darrion/linux-6.10-rc4/arch/x86/boot/bzImage \
-append "console=ttyS0 root=/dev/sda earlyprintk=serial net.ifnames=0" \
-drive file=qemu_image/bookworm.img,format=raw \
-net user,host=10.0.2.10,hostfwd=tcp:127.0.0.1:10021-:22 \
-net nic,model=e1000 \
-monitor unix:qemu-monitor-socket,server,nowait \
-enable-kvm \
-cpu host \
-usb \
-device nec-usb-xhci \
-device usb-host,hostbus=3,hostaddr=5 \
-nographic \
-D ./log.txt \
-pidfile vm.pid \
2>&1 | tee vm.log
Image:
Debian 12 from:
https://github.com/google/syzkaller/blob/master/tools/create-image.sh
Qemu:
Tried using version 6.2 from apt and 9.0.90 from source
Linux Kernel:
*
Tried 6.10, 6.10-rc4, 6.6.43
*
Config:
https://github.com/google/syzkaller/blob/master/dashboard/config/linux/upstream-usb.config
(with CONFIG_KCOV_INSTRUMENT_ALL turned off since this breaks suspend/resume)
*
Also tried the standard kvm_guest.config generated config
