zhaoshuang
abffa868a8
Alibaba Cloud ECS instances expose "Alibaba Cloud ECS" in DMI product_name/bios_vendor and "Alibaba Cloud" in sys_vendor. None of these match dmi_vendor_table[], so systemd-detect-virt --vm reports "none" on these machines, even though they run on a KVM-based hypervisor. This is especially visible on ARM64 instances, where the CPUID fallback does not exist (x86 only) and /proc/device-tree is not populated. Add "Alibaba Cloud ECS" to dmi_vendor_table[], mapping to VIRTUALIZATION_KVM. The narrower prefix avoids matching the bare "Alibaba Cloud" sys_vendor value, reducing the false-positive surface for Alibaba's bare-metal (X-Dragon) instances compared to the original broader prefix. bios_vendor also carries the same string on ECS VMs though, so the protection is not complete — fully resolving the VM-vs-bare-metal ambiguity would need the SMBIOS BIOS-Characteristics bit check that the Amazon EC2 entry uses. The existing "back to DMI" fallback path in detect_vm() reports "kvm" on both x86 and ARM64.
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