UEFI instance snapshot error

The problem still exists independent on the version of libvirt. I tried libvirt 11.10.0

The issue is the format of the nvram disk file. I converted it from raw to qcow2 and can now take snapshots with memory of VMs with UEFI.

Here are my changes in the XML config:
**from:**
`/var/lib/libvirt/qemu/nvram/a5b15197-6388-4bc8-a4f4-c446d28fde7c.fd`
**to:**
`/var/lib/libvirt/qemu/nvram/a5b15197-6388-4bc8-a4f4-c446d28fde7c.**qcow2**.fd`

_Originally posted by @ingox in https://github.com/apache/cloudstack/discussions/12427#discussioncomment-17524924_

首先使用 raw NVRAM 磁盘复现 UEFI VM 的内存快照，然后将其与报告的 qcow2 配置进行比较。跟踪生成或传递 NVRAM 格式的 CloudStack/libvirt 快照处理流程；完成标准是无需手动修改 XML 即可正常使用 UEFI 内存快照。

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