Re: [PATCH v8 1/4] firmware: introduce sysfs driver for QEMU's fw_cfg device
From: "Michael S. Tsirkin" <mst@redhat.com>
Date: 2016-02-21 18:01:04
Also in:
linux-devicetree, lkml, qemu-devel
On Sun, Feb 21, 2016 at 08:06:17AM -0500, Gabriel L. Somlo wrote:
quoted
So for all arches which support ACPI, I think this driver should just rely on ACPI.There was a discussion about that a few versions ago, and IIRC the conclusion was not to expect the firmware to contend for fw_cfg access after the guest kernel boots: https://lkml.org/lkml/2015/10/5/283
Interesting. Igor wanted to do this again recently ... I'll think it over and get back to you/list on this.
(I even had a prototype version doing what you suggested, but per the above reference decided to drop it -- which IMHO is for the better, since otherwise I'd have had to ifdef between ACPI and non-ACPI versions of the driver -- see https://lkml.org/lkml/2015/11/4/534 )
I'm not sure I get it - won't you only ifdef the accessor function? -- MST