linux-kernel - Re: [PATCH v3 1/4] firmware: introduce sysfs driver for QEMU's fw

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Message-ID: <20151006181703.GG1962@HEDWIG.INI.CMU.EDU>
Date:	Tue, 6 Oct 2015 14:17:03 -0400
From:	"Gabriel L. Somlo" <somlo@....edu>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Greg KH <gregkh@...uxfoundation.org>, paul@...an.com,
	galak@...eaurora.org, Will Deacon <will.deacon@....com>,
	agross@...eaurora.org, Mark Rutland <mark.rutland@....com>,
	zajec5@...il.com, hanjun.guo@...aro.org,
	Catalin Marinas <catalin.marinas@....com>,
	Linux API <linux-api@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	kernelnewbies@...nelnewbies.org,
	Matt Fleming <matt.fleming@...el.com>,
	Laszlo Ersek <lersek@...hat.com>,
	"Jordan Justen (Intel address)" <jordan.l.justen@...el.com>,
	"Michael S. Tsirkin" <mst@...hat.com>, peter.maydell@...aro.org,
	Leif Lindholm <leif.lindholm@...aro.org>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Paolo Bonzini <pbonzini@...hat.com>, kraxel@...hat.com,
	"qemu-devel@...gnu.org Developers" <qemu-devel@...gnu.org>
Subject: 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@....edu> wrote:
> > From: Gabriel Somlo <somlo@....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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