KVM: selftests: Add a test for KVM_CAP_EXIT_ON_EMULATION_FAILURE

Add a selftest to exercise the KVM_CAP_EXIT_ON_EMULATION_FAILURE
capability.

This capability is also exercised through
smaller_maxphyaddr_emulation_test, but that test requires
allow_smaller_maxphyaddr=Y, which is off by default on Intel when ept=Y
and unconditionally disabled on AMD when npt=Y. This new test ensures
that KVM_CAP_EXIT_ON_EMULATION_FAILURE is exercised independent of
allow_smaller_maxphyaddr.

Signed-off-by: David Matlack <dmatlack@google.com>
Link: https://lore.kernel.org/r/20221102184654.282799-11-dmatlack@google.com


Signed-off-by: Sean Christopherson <seanjc@google.com>