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From: Laszlo Ersek <lersek@redhat.com>
Message-ID: <f70c8266-04c4-825a-1046-58975d1b714d@redhat.com>
Date: Thu, 24 Nov 2016 09:37:41 +0100
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Subject: Re: [Qemu-devel] [PATCH v3 for-2.9 0/3] q35: add negotiable
 broadcast SMI
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To: "Michael S. Tsirkin" <mst@redhat.com>, Kevin O'Connor <kevin@koconnor.net>
Cc: Paolo Bonzini <pbonzini@redhat.com>, qemu devel list <qemu-devel@nongnu.org>, Gerd Hoffmann <kraxel@redhat.com>, Igor Mammedov <imammedo@redhat.com>, "Jordan Justen (Intel address)" <jordan.l.justen@intel.com>, Michael Kinney <michael.d.kinney@intel.com>

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):

https://www.mail-archive.com/qemu-devel@nongnu.org/msg354852.html

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

https://www.mail-archive.com/qemu-devel@nongnu.org/msg359348.html

but it wasn't merged, apparently.

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

Thanks
Laszlo