On Mon, Aug 23, 2021, Peter Gonda wrote: > V5: > * Fix up locking scheme Please add a selftest to prove/verify the anti-deadlock scheme actually works. Unless I'm mistaken, only KVM_SEV_INIT needs to be invoked, i.e. the selftest wouldn't need anything remotely close to full SEV support. And that means it should be trivial to verify the success path as well. E.g. create three SEV VMs (A, B, and C) and verify migrating from any VM to any other VM works (since none of the VMs have memory regions). Then spin up eight pthreads and have each thread concurrently migrate a specific combination an arbitrary number of times. Ignore whether the migration failed or succeeded, "success" from the test's perspective is purely that it completed, i.e. didn't deadlock.
