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Re: [Qemu-devel] [PATCH v3 for-2.9 0/3] q35: add negotiable broadcast SM

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH v3 for-2.9 0/3] q35: add negotiable broadcast SMI
Date: Mon, 28 Nov 2016 12:53:02 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0

On 28/11/2016 11:22, Laszlo Ersek wrote:
> Michael suggested to use negotiation like virtio does (where the host
> can reject invalid combinations of requested features):
> http://lists.nongnu.org/archive/html/qemu-devel/2016-11/msg03077.html
> http://lists.nongnu.org/archive/html/qemu-devel/2016-11/msg03218.html
> I thought negotiation was overkill:
> http://lists.nongnu.org/archive/html/qemu-devel/2016-11/msg03123.html
> but I figured I'd just stick with the recommendation.

I think negotiation is useful.  By doing things like "prevent
broadcast_SMI && !parked_VCPUs if max_cpus > smp_cpus", it lets you
commit your OVMF patch immediately for example.


>> > If it is there just write true/false to it to enable/disable, and qemu
>> > checks the field each time a smi is raised.
> If we agree there's no need for negotiation, I'm game.

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