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Re: [Qemu-devel] [RFC 12/42] pc: initialize legacy hotplug only for 2.6

From: Eduardo Habkost
Subject: Re: [Qemu-devel] [RFC 12/42] pc: initialize legacy hotplug only for 2.6 and older machine types
Date: Tue, 10 May 2016 17:24:14 -0300
User-agent: Mutt/1.5.24 (2015-08-30)

On Mon, May 02, 2016 at 02:33:21PM +0200, Igor Mammedov wrote:
> on old machine types CPU hotplug was uncondtionally
> enabled since it was introduced, consuming IO ports
> and providing AML regardles of whether it was actually
> in use or not. Keep it so for 2.6 and older machines.
> New machine types will have an option to turn CPU
> hotplug on if it's needed while by default it stays
> disabled not consuming extra RAM/IO resources.
> Signed-off-by: Igor Mammedov <address@hidden>

What if people are using "-machine pc -smp N,max_cpus=M"?
Shouldn't we at least warning about missing CPU hotplug support
when using just "max_cpus" with no "cpu-hotplug=on" with pc-2.7
and newer? Should max_cpus > smp_cpus automatically set


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