arm64: mops: Document booting requirement for HCR_EL2.MCE2

arm64: mops: Document booting requirement for HCR_EL2.MCE2

Document that hypervisors must set HCR_EL2.MCE2 and handle MOPS
exceptions when they migrate a vCPU to another type of CPU, as Linux may
not be able to handle the exception at all times.

As one example, when running under nested virtualization, KVM does not
handle MOPS exceptions from the nVHE/hVHE EL2 hyp as the hyp is never
migrated, so the host hypervisor needs to handle them. There may be
other situations (now or in the future) where the kernel can't handle an
unexpected MOPS exception, so require that the hypervisor handles them.

Signed-off-by: Kristina Martsenko <kristina.martsenko@arm.com>
Link: https://lore.kernel.org/r/20240930161051.3777828-4-kristina.martsenko@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>