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From: "Michael S. Tsirkin" <mst@redhat.com>
To: Igor Mammedov <imammedo@redhat.com>
Cc: ben@skyportsystems.com, qemu-devel@nongnu.org,
	Laszlo Ersek <lersek@redhat.com>,
	Gerd Hoffmann <kraxel@redhat.com>
Subject: Re: [Qemu-devel] [PATCH v2 3/6] ACPI: Add Virtual Machine Generation ID support
Date: Tue, 17 Jan 2017 16:41:57 +0200	[thread overview]
Message-ID: <20170117163848-mutt-send-email-mst@kernel.org> (raw)
In-Reply-To: <20170117140058.166de8c2@nial.brq.redhat.com>

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.

-- 
MST

  parent reply	other threads:[~2017-01-17 14:42 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-01-16 19:20 [Qemu-devel] [PATCH v2 0/6] Add support for VM Generation ID ben
     [not found] ` <cover.1484594095.git.ben@skyportsystems.com>
2017-01-16 19:20   ` [Qemu-devel] [PATCH v2 1/6] docs: vm generation id device's description ben
2017-01-16 19:51     ` Eric Blake
2017-01-16 20:08       ` Ben Warren
2017-01-16 21:20         ` Eric Blake
2017-01-16 19:20   ` [Qemu-devel] [PATCH v2 2/6] ACPI: Add a function for building named qword entries ben
2017-01-16 19:20   ` [Qemu-devel] [PATCH v2 3/6] ACPI: Add Virtual Machine Generation ID support ben
2017-01-17 13:00     ` Igor Mammedov
2017-01-17 13:18       ` Laszlo Ersek
2017-01-17 14:41       ` Michael S. Tsirkin [this message]
2017-01-17 16:37         ` Laszlo Ersek
2017-01-18  0:23       ` Ben Warren
2017-01-16 19:20   ` [Qemu-devel] [PATCH v2 4/6] qmp/hmp: add query-vm-generation-id and 'info vm-generation-id' commands ben
2017-01-16 19:20   ` [Qemu-devel] [PATCH v2 5/6] qmp/hmp: add set-vm-generation-id commands ben
2017-01-18  8:55     ` Igor Mammedov
2017-01-18 22:14       ` Ben Warren
2017-01-16 19:20   ` [Qemu-devel] [PATCH v2 6/6] PC: Support dynamic sysbus on pc_i440fx ben
2017-01-18  8:46     ` Igor Mammedov

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