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SubjectRe: [PATCH v8 0/4] SysFS driver for QEMU fw_cfg device
On Wed, Feb 03, 2016 at 10:47:29PM +0000, Matt Fleming wrote:
> On Thu, 28 Jan, at 09:23:10AM, Gabriel L. Somlo wrote:
> > From: "Gabriel Somlo" <somlo@cmu.edu>
> >
> > Allow access to QEMU firmware blobs, passed into the guest VM via
> > the fw_cfg device, through SysFS entries. Blob meta-data (e.g. name,
> > size, and fw_cfg key), as well as the raw binary blob data may be
> > accessed.
> >
> > The SysFS access location is /sys/firmware/qemu_fw_cfg/... and was
> > selected based on overall similarity to the type of information
> > exposed under /sys/firmware/dmi/entries/...
> >
> > This functionality is primarily intended to serve as a host->guest
> > configuration data transfer mechanism that is both:
> >
> > - asynchronous: the host doesn't need to wait for the guest
> > to be ready to accept data (e.g., by starting
> > an agent daemon)
> >
> > - out-of-band: there is no need to commandeer a guest element
> > normally visible and available to the guest user
> > (e.g., kernel cmdline, mounting floppy/cdrom, etc.)
> >
> > QEMU now allows arbitrary fw_cfg blobs to be added via the command line,
> > so it would be nice to make them easy to retrieve from within the guest
> > OS, and the niceset and easiest way I can think of is
> >
> > cat /sys/firmware/qemu-fw-cfg/.../<some-blob-name>/raw
> >
> > New since v7:
> >
> > - kbuild testbot complained about a warning on ia64, so limit
> > the availability of fw_cfg in Kconfig to only architectures
> > on which QEMU makes it available, which include:
> >
> > (ARM || ARM64 || PPC_PMAC || SPARC || X86)
>
> This is looking pretty good now. Does anyone have remaining
> objections before this gets merged?

All now merged in my tree, thanks.

greg k-h

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