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

[Michael S. Tsirkin]

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

-- 
MST