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Re: [Qemu-devel] [PATCH v2 3/6] ACPI: Add Virtual Machine Generation ID

From: Michael S. Tsirkin
Subject: Re: [Qemu-devel] [PATCH v2 3/6] ACPI: Add Virtual Machine Generation ID support
Date: Tue, 17 Jan 2017 16:41:57 +0200

On Tue, Jan 17, 2017 at 02:00:58PM +0100, Igor Mammedov wrote:
> Question is how you'd get address of it and I think that's where
> writable fwcfg files come in play.
> I'd prefer fwcfg_loader in firmware to write it back after buffer
> allocation is done as it's already has utilities for fw_cfg,
> but that probably would mean extending loader protocol to support
> new writeback command.

Right. It's quite easy to do as at least seabios was written to
ignore commands it does not recognize. So with old bios you
just don't get a write. Not sure about UEFI, worth checking.

> PS, address one would get from guest should be migrated as well

IIRC writeable fw cfg blobs are migrated automatically.


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