2017-07-11 14:35-0400, Bandan Das: > Jim Mattson <jmattson@xxxxxxxxxx> 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. Most likely, but not certainly. I also don't see a to diverge from the spec here.
