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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.
--
MST
- [Qemu-devel] [PATCH v2 1/6] docs: vm generation id device's description, (continued)
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Re: [Qemu-devel] [PATCH v2 3/6] ACPI: Add Virtual Machine Generation ID support, Ben Warren, 2017/01/17
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