[pve-devel] [PATCH qemu-server] snapshot: prohibit live snapshot (remove) of qcow2 TPM drive on storage with snapshot-as-volume-chain

[Fiona Ebner]

Am 19.11.25 um 1:06 PM schrieb Fabian Grünbichler:
> On November 19, 2025 12:59 pm, Fiona Ebner wrote:
>> QSD and swtpm currently are not prepared for dealing with
>> blockdev-replace and rename operations that snapshot or snapshot
>> remove operations with a snapshot-as-volume-chain storage entail.
>>
>> Reported-by: Friedrich Weber <f.weber at proxmox.com>
>> Signed-off-by: Fiona Ebner <f.ebner at proxmox.com>
> 
> Reviewed-by: Fabian Grünbichler <f.gruenbichler at proxmox.com>
> 
> unfortunate, but we have to live with this limitation for now..

I'll look into sending the 'blockdev-replace', etc. QMP commands to QSD
instead of QEMU for TPM. We'll see if it says something like "can't
replace, because active export", but might just require some additional
implementation in QSD then. I don't see a fundamental limitation (yet).