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Re: [Qemu-devel] [PATCH v2 3/6] ACPI: Add Virtual Machine Generation ID
From: |
Laszlo Ersek |
Subject: |
Re: [Qemu-devel] [PATCH v2 3/6] ACPI: Add Virtual Machine Generation ID support |
Date: |
Tue, 17 Jan 2017 17:37:14 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.6.0 |
On 01/17/17 15:41, Michael S. Tsirkin wrote:
> 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.
Same; OVMF skips (and logs) unknown commands.
>
>> PS, address one would get from guest should be migrated as well
>
> IIRC writeable fw cfg blobs are migrated automatically.
>
When added with rom_add_blob() or derivative functions / function-like
macros, they are.
Thanks
Laszlo
- Re: [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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