Jim Mattson <jmatt...@google.com> writes: ... >>> I can find the definition for an vmexit in case of index >= >>> VMFUNC_EPTP_ENTRIES, but not for !vmcs12->eptp_list_address in the SDM. >>> >>> Can you give me a hint? >> >> I don't think there is. Since, we are basically emulating eptp switching >> for L2, this is a good check to have. > > There is nothing wrong with a hypervisor using physical page 0 for > whatever purpose it likes, including an EPTP list.
Right, but of all the things, a l1 hypervisor wanting page 0 for a eptp list address most likely means it forgot to initialize it. Whatever damage it does will still end up with vmfunc vmexit anyway. Bandan
