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qemu-patch-raspberry4
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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: 1cd4e0f6f0 ("s390x/cmma: clean up cmma reset")
Cc: qemu-stable@nongnu.org
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
(cherry picked from commit 1a0e4c8b02)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
stable-2.8
Christian Borntraeger 2017-01-24 22:17:47 +01:00 committed by Michael Roth
parent 5e40f283e5
commit 5f4b9013e6
1 changed files with 1 additions and 1 deletions
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2
hw/s390x/s390-virtio.c
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@ -204,8 +204,8 @@ void s390_machine_reset(void)
{
S390CPU *ipl_cpu = S390_CPU(qemu_get_cpu(0));
qemu_devices_reset();
s390_cmma_reset();
qemu_devices_reset();
s390_crypto_reset();
/* all cpus are stopped - configure and start the ipl cpu only */