Support status for isolation-machine feature from Debian Infra?

[Mo Zhou <lumin@debian.org>]

Hi folks,

As we know the Debian CI Infrastructure, which runs autopkgtest upon
relevant package updates to help us improve distribution quality.
However, it still doesn't support the isolation-machine feature, which
associates to tests that require interaction with the kernel, such as
kernel module tests.

zfs-linux has one of such tests. The test loads the zfs kernel module
and trys to do smoke tests such as creating zpools:
https://salsa.debian.org/zfsonlinux-team/zfs/blob/master/debian/tests/control#L1-2

For quite a long time debian CI keeps skipping this test, e.g.
https://ci.debian.net/data/autopkgtest/testing/amd64/z/zfs-linux/2068033/log.gz

| kernel-smoke-test    SKIP Test requires machine-level isolation but testbed does not provide that
| dkms-zfs-test        PASS

I have two questions given the background:

(1) What is the support status for "isolation-machine" feature?

(2) Is it a good idea to write a test script, that manually sets up
    a qemu VM then tests the module[1]? (Such that we can get rid of the
    isolation-machine restriction, and make Debian CI test the ZFS
    kernel module)

    Or any better idea?

[1] thanks to @zhsj for a hint: This can be implemented by setting
    up a qemu VM with exported ssh port.