Gregory Price wrote: [..] > Leverage the same QEMU branch, machine, and configuration as my prior > tests, i'm now experiencing a kernel panic on boot. Will debug a bit > in the morning, but here is the stack trace i'm seeing > > Saw this in both 1 and 2 root port configurations > > (note: I also have the region reset issue previously discussed on top of > your branch). > > QEMU configuration: > > sudo /opt/qemu-cxl/bin/qemu-system-x86_64 \ > -drive file=/var/lib/libvirt/images/cxl.qcow2,format=qcow2,index=0,media=disk,id=hd \ > -m 2G,slots=4,maxmem=4G \ > -smp 4 \ > -machine type=q35,accel=kvm,cxl=on \ > -enable-kvm \ > -nographic \ > -device pxb-cxl,id=cxl.0,bus=pcie.0,bus_nr=52 \ > -device cxl-rp,id=rp0,bus=cxl.0,chassis=0,port=0,slot=0 \ > -object memory-backend-file,id=mem0,mem-path=/tmp/mem0,size=1G,share=true \ > -device cxl-type3,bus=rp0,volatile-memdev=mem0,id=cxl-mem0 \ > -M cxl-fmw.0.targets.0=cxl.0,cxl-fmw.0.size=1G > [..] > [ 15.162837] RIP: 0010:bus_add_device+0x5b/0x150 I suspect cxl_bus_type is not intialized yet. I think this should address it: diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c index 0faeb1ffc212..6fe00702327f 100644 --- a/drivers/cxl/core/port.c +++ b/drivers/cxl/core/port.c @@ -2011,6 +2011,6 @@ static void cxl_core_exit(void) debugfs_remove_recursive(cxl_debugfs); } -module_init(cxl_core_init); +subsys_initcall(cxl_core_init); module_exit(cxl_core_exit); MODULE_LICENSE("GPL v2");