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Re: [Qemu-arm] [Qemu-devel] [PATCH RFC] fw-cfg: support writeable blobs

From: Michael S. Tsirkin
Subject: Re: [Qemu-arm] [Qemu-devel] [PATCH RFC] fw-cfg: support writeable blobs
Date: Mon, 22 Feb 2016 22:12:41 +0200

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.


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