Re: [Qemu-devel] [PATCH v5 0/7] QEMU memory hot unplug support

[Paolo Bonzini]

On 30/03/2015 04:53, Zhu Guihua wrote:
> Question:
> 
> When migrating from old qemu to one with this hot remove feature, I found
> this feature would not work any more in new qemu.
> 
> The reason is that DSDT table will not re-generate in new qemu when
> migration.
> So the hot remove will not work in the new qemu even though qemu
> has this feature.
> 
> Is it possible to re-generate dsdt table when migration?

No, consider the case when the OS is _executing_ the DSDT table during
migration!

You can either ignore the issue, or disable hot-unplug for older machine
types---that is, only enable it for pc-2.4.  Then you'll get consistent
behavior wherever the VM is started in a cluster.

Paolo