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Re: [PATCH v3 1/4] firmware: introduce sysfs driver for QEMU's fw_cfg device

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  Re: [PATCH v3 1/4] firmware: introduce sysfs driver for QEMU's fw_cfg device Andy Lutomirski <luto@amacapital.net> - 2015-10-06 20:00 +0200
    Re: [PATCH v3 1/4] firmware: introduce sysfs driver for QEMU's  fw_cfg device "Gabriel L. Somlo" <somlo@cmu.edu> - 2015-10-06 20:20 +0200

#1240817 — Re: [PATCH v3 1/4] firmware: introduce sysfs driver for QEMU's fw_cfg device

On Sat, Oct 3, 2015 at 4:28 PM, Gabriel L. Somlo <somlo@cmu.edu> wrote:
> From: Gabriel Somlo <somlo@cmu.edu>
>
> Make fw_cfg entries of type "file" available via sysfs. Entries
> are listed under /sys/firmware/qemu_fw_cfg/by_key, in folders
> named after each entry's selector key. Filename, selector value,
> and size read-only attributes are included for each entry. Also,
> a "raw" attribute allows retrieval of the full binary content of
> each entry.
>
> This patch also provides a documentation file outlining the
> guest-side "hardware" interface exposed by the QEMU fw_cfg device.
>

What's the status of "by_name"?  There's a single (presumably
incorrect) mention of it in a comment in this patch.

I would prefer if the kernel populated by_name itself rather than
deferring that to udev, since I'd like to use this facility in virtme,
and I'd like to use fw_cfg very early on boot before I even start
udev.

--Andy
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#1240841 — Re: [PATCH v3 1/4] firmware: introduce sysfs driver for QEMU's fw_cfg device

On Tue, Oct 06, 2015 at 10:54:42AM -0700, Andy Lutomirski wrote:
> On Sat, Oct 3, 2015 at 4:28 PM, Gabriel L. Somlo <somlo@cmu.edu> wrote:
> > From: Gabriel Somlo <somlo@cmu.edu>
> >
> > Make fw_cfg entries of type "file" available via sysfs. Entries
> > are listed under /sys/firmware/qemu_fw_cfg/by_key, in folders
> > named after each entry's selector key. Filename, selector value,
> > and size read-only attributes are included for each entry. Also,
> > a "raw" attribute allows retrieval of the full binary content of
> > each entry.
> >
> > This patch also provides a documentation file outlining the
> > guest-side "hardware" interface exposed by the QEMU fw_cfg device.
> >
> 
> What's the status of "by_name"?  There's a single (presumably
> incorrect) mention of it in a comment in this patch.
> 
> I would prefer if the kernel populated by_name itself rather than
> deferring that to udev, since I'd like to use this facility in virtme,
> and I'd like to use fw_cfg very early on boot before I even start
> udev.

"by_name" is added with patch 4/4 of the series, which I kept separate
due to the "To udev or not to udev" conversation from earlier. So far
I haven't yet figured out just HOW I'd set it up in udev, but it works
already if done in the kernel :)

Thanks,
--Gabriel
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