s390x/tcg: tolerate wrong wakeups due to floating interrupts

s390x/tcg: tolerate wrong wakeups due to floating interrupts

This is a preparation for floating interrupt support and only applies to
MTTCG, single threaded TCG works just fine. If a floating interrupt wakes
up a VCPU and the CPU thinks it can run (clearing cs->halted), at
the point where the interrupt would be delivered, already another VCPU
might have picked up the interrupt, resulting in a wakeup without an
interrupt (executing wrong code).

It is wrong to let the VCPU continue to execute (the WAIT PSW). Instead,
we have to put the VCPU back to sleep.

Signed-off-by: David Hildenbrand <[email protected]>
Message-Id: <20180129125623[email protected]>
Signed-off-by: Cornelia Huck <[email protected]>