On 13/04/2017 07:02, Bandan Das wrote: >> For EPT it is, you're right it's fishy. The "nested_access" should be >> computed in translate_nested_gpa, which is where kvm->arch.nested_mmu >> (non-EPT) requests to access kvm->arch.mmu (EPT). > > Thanks for the clarification. Is it the case when L1 runs L2 without > EPT ? I can't figure out the case where translate_nested_gpa will actually > be called. It happens when L2 instruction are emulated by L0, for example when L1 is passing through I/O ports to L2 and L2 runs an "insb" instruction. I think this case is not covered by vmx.flat. Paolo > FNAME(walk_addr_nested) calls walk_addr_generic > with &vcpu->arch.nested_mmu and init_kvm_nested_mmu() sets gva_to_gpa() > with the appropriate "_nested" functions. But the gva_to_gpa() pointers > don't seem to get invoked at all for the nested case. > > BTW, just noticed that setting PFERR_USER_MASK is redundant since > translate_nested_gpa does it too.
