[yocto] QEMU kernel defconfigs

[Jon Mason]

I'm having difficulty determining where the kernel defconfigs are
defined and located.  I'm specifically looking for the qemuarm and
qemuarm64 kernel defconfigs.  I've looked at the relevant
documentation, https://www.yoctoproject.org/docs/2.5.1/kernel-dev/kernel-dev.html#using-an-in-tree-defconfig-file
and
no SRC_URI with defconfig or KBUILD_DEFCONFIG_KMACHINE defined in
meta/recipes-kernel/linux/linux-yocto_4.18.bb

What am I missing?

Also, "A defconfig file is simply a .config renamed to "defconfig"."
is not correct.  A properly created defconfig is created by `make
savedefconfig` and is a minimal file which only has the delta between
the desired config and defaults from the Kconfig files.
https://www.yoctoproject.org/docs/2.5.1/kernel-dev/kernel-dev.html#creating-a-defconfig-file

Thanks,
Jon