ARMv9 core (such as A720）can bring VMID(or StreamID) to external fabric?

I'm not aware of any Armv9-A processor that exports the VMID on "regular" memory accesses.

Depending on what you're trying to achieve, you could look at MPAM if you want to partition and/or monitor shared resources such as caches.

Or, you could look at PBHA, which lets you specify additional system-specific attributes for a page:

https://developer.arm.com/documentation/102530/0002/Memory-management/Page-based-hardware-attributes?lang=en

If you're working with an existing SoC, you'll have to check whether it supports either of these mechanisms and what it does with the information.

I'm not aware of any Armv9-A processor that exports the VMID on "regular" memory accesses.

Depending on what you're trying to achieve, you could look at MPAM if you want to partition and/or monitor shared resources such as caches.

Or, you could look at PBHA, which lets you specify additional system-specific attributes for a page:

https://developer.arm.com/documentation/102530/0002/Memory-management/Page-based-hardware-attributes?lang=en

If you're working with an existing SoC, you'll have to check whether it supports either of these mechanisms and what it does with the information.