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s390x/kvm: fix small race reboot vs. cmma
Right now we reset all devices before we reset the cmma states. This can result in the host kernel discarding guest pages that were previously in the unused state but already contain a bios or a -kernel file before the cmma reset has finished. This race results in random guest crashes or hangs during very early reboot. Fixes: 1cd4e0f ("s390x/cmma: clean up cmma reset") Cc: qemu-stable@nongnu.org Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> (cherry picked from commit 1a0e4c8) Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
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