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

From: Laszlo Ersek
Subject: Re: [Qemu-devel] [PATCH v3 for-2.9 0/3] q35: add negotiable broadcast SMI
Date: Thu, 24 Nov 2016 09:37:41 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.5.0

On 11/24/16 05:29, Michael S. Tsirkin wrote:
> On Wed, Nov 23, 2016 at 07:38:35PM -0500, Kevin O'Connor wrote:
>> As a general comment - it does seem unfortunate that we keep building
>> adhoc interfaces to communicate information from firmware to QEMU.  We
>> have a generic mechanism (fw_cfg) for passing adhoc information from
>> QEMU to the firmware, but the inverse seems to always involve magic
>> pci registers, magic io space registers, specific init ordering, etc.
> FWIW I posted a proposal
>       fw-cfg: support writeable blobs
> a while ago to try to address that

Yes, here's the discussion (Feb 2016):


and it was even part of a pull req (Mar 2016):


but it wasn't merged, apparently.

If QEMU (re)gains this feature, I can try basing the broadcast SMI
negotiation on it.


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