From 1a0e4c8b02ea510508970c333ee610a90b921cbb Mon Sep 17 00:00:00 2001 From: Christian Borntraeger Date: Tue, 24 Jan 2017 22:17:47 +0100 Subject: [PATCH] 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: 1cd4e0f6f0a6 ("s390x/cmma: clean up cmma reset") Cc: qemu-stable@nongnu.org Signed-off-by: Christian Borntraeger --- hw/s390x/s390-virtio.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/hw/s390x/s390-virtio.c b/hw/s390x/s390-virtio.c index 0a963473ad..7a3a7fe5fd 100644 --- a/hw/s390x/s390-virtio.c +++ b/hw/s390x/s390-virtio.c @@ -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 */