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Re: [Qemu-devel] [PATCH RFC] fw-cfg: support writeable blobs
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCH RFC] fw-cfg: support writeable blobs |
Date: |
Tue, 23 Feb 2016 11:09:26 +0200 |
On Tue, Feb 23, 2016 at 08:07:17AM +0100, Gerd Hoffmann wrote:
> On Mo, 2016-02-22 at 22:12 +0200, Michael S. Tsirkin wrote:
> > On Mon, Feb 22, 2016 at 03:26:56PM +0100, Gerd Hoffmann wrote:
> > > On Mo, 2016-02-22 at 14:41 +0200, Michael S. Tsirkin wrote:
> > > > Useful to send guest data back to QEMU.
> > >
> > > Use case?
> > >
> > > cheers,
> > > Gerd
> >
> > VM GEN ID at least wants to pass address of some blob
> > in guest memory to host.
> >
> > Apparently, that's also useful for nvdimm.
> >
> > A reasonable way to do that seems to be to write it into
> > fw cfg file, this way it's also migrated automatically.
>
> Both seem to be about acpi aml code talking to qemu backend.
At least not for gen id - there will be a linker patch
to initialize that.
> Not sure fw_cfg files are reasonable for that, given that you have to
> fetch the directory listing, parse it to figure the entry index, ...
>
> I want see a patch actually using that before going to merge it.
>
> cheers,
> Gerd
Absolutely, this makes sense.
--
MST