Re: [Question] some questions about vmx

linmiaohe
2020-02-07T07:10:56Z

Hi:
Vitaly Kuznetsov <vkuznets@redhat.com> writes:
>linmiaohe <linmiaohe@huawei.com> writes:
>
>> About nWMX.
>> When nested_vmx_handle_enlightened_vmptrld() return 0, it do not
>> inject any exception or set rflags to Indicate VMLAUNCH instruction
>> failed and skip this instruction. This would cause nested_vmx_run()
>
>Yes, it seems it can.
>
>nested_vmx_handle_enlightened_vmptrld() has two possible places where it can fail:
>
>kvm_vcpu_map() -- meaning that the guest passed some invalid GPA.
>revision id check -- meaning that the supplied eVMCS is unsupported/garbage.
>
>I think the right behavior would be to nested_vmx_failInvalid() in both these cases. We can also check what genuing Hyper-V does.
>

Many thanks for your reply. I think this would be a problem too. And would you like to fix this potential problem? I have no idea
how to fix this correctly... Thanks again.