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[Qemu-devel] Broken live Migration in Qemu

From: Peter Lieven
Subject: [Qemu-devel] Broken live Migration in Qemu
Date: Mon, 6 Jun 2016 15:32:43 +0200
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during internal testing of Qemu I found a vServer running Ubuntu 12.04 
(kernel 3.13) and a slave SQL server to
stop replicating from the master. This seems to be reproducible. It is possible 
to continue replication when issuing a slave stop / slave start.
There is no error visible on the vServer.

Has anyone a fix in mind that could be related to such an issue?

Host kernel in Linux 4.4, Guest kernel 3.13. Guest driver is virtio-blk via 
iSCSI. Emulated vCPU is Westmere.

I already have this patch here applied:

target-i386: do not read/write MSR_TSC_AUX from KVM if CPUID bit is not set

Without this migration for Westmere and earlier CPUs is completely broken.

I also found the following commits in git which are not applied (yet):

migration (ordinary): move bdrv_invalidate_cache_all of of coroutine context
migration: fix incorrect memory_global_dirty_log_start outside BQL

I will try with these and also with current master.


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