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");
