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Simplify the shutdown of non-protected VMs. There is no need to do
complex manipulations of the counter if it was zero.
This also fixes a very rare race which caused pages to be torn down
from the address space with a non-zero counter even on older machines
that don't support the UVC instruction, causing a crash.
Reported-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Fixes: fb491d5500a7 ("KVM: s390: pv: asynchronous destroy for reboot")
Reviewed-by: Nico Boehr <nrb@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Message-ID: <20230705111937.33472-2-imbrenda@linux.ibm.com>
5ff9218157