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KVM: s390: pv: simplify shutdown and fix race
[ Upstream commit 5ff9218 ] 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: fb491d5 ("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> Signed-off-by: Sasha Levin <sashal@kernel.org>
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