2017-07-11 15:38-0400, Bandan Das: > Radim Krčmář <rkrcmar@xxxxxxxxxx> writes: > > > 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. > > Actually, this is a specific case where I would like to diverge from the spec. > But then again, it's L1 shooting itself in the foot and this would be a rarely > used code path, so, I am fine removing it. Thanks, we're not here to judge the guest, but to provide a bare-metal experience. :)
