Multi-engine address translation facility

A computer-implemented method of facilitating processing in a computing environment, the computer-implemented method comprising:

• providing an address translation facility for multiple virtualization levels, wherein a guest-virtual address may be translated to a guest non-virtual address, the guest non-virtual address corresponding without translation to a host virtual address, and the host-virtual address may be translated to a host non-virtual address, where translation within a virtualization level is specified as a sequence of accesses to address translation tables, the providing comprising:
• providing a first translation engine;
• providing a second translation engine, wherein the first translation engine and the second translation engine each have capacity to perform address translation within a single virtualization level of the multiple virtualization levels, and wherein based on, in operation, the first translation engine performing a guest level translation, the second translation engine performs a host level translation of a resulting guest non-virtual address to a host non-virtual address based on the guest level translation by the first translation engine;
• and
• wherein the address translation facility further comprises a table cache to receive table fetch requests from the first translation engine and the second translation engine, and wherein an exception detected by one of the first and second translation engines is propagated to the other of the first and second translation engines through the table cache as a table fetch exception.