RE: [PATCH net-next 1/3] VMCI: only load on VMware hypervisor

[Dexuan Cui]

> From: Jorgen S. Hansen [mailto:jhansen@xxxxxxxxxx]
> > Without the patch, vmw_vsock_vmci_transport.ko and vmw_vmci.ko can
> > automatically load when an application creates an AF_VSOCK socket.
> >
> > This is the expected good behavior on VMware hypervisor, but as we
> > are going to add hv_sock.ko (i.e. Hyper-V transport for AF_VSOCK), we
> > should make sure vmw_vsock_vmci_transport.ko doesn't load on Hyper-V,
> > otherwise there is a -EBUSY conflict when both vmw_vsock_vmci_transport.ko
> > and hv_sock.ko try to call vsock_core_init() on Hyper-V.
> 
> The VMCI driver (vmw_vmci.ko) is used both by the VMware guest support
> (VMware Tools primarily) and by our Workstation product. Always disabling the
> VMCI driver on Hyper-V means that user wonât be able to run Workstation
> nested in Linux VMs on Hyper-V. Since the VMCI driver itself isnât the problem
> here, maybe we could move the check to vmw_vsock_vmci_transport.ko?
> Ideally, there should be some way for a user to have access to both protocols,
> but for now disabling the VMCI socket transport for Hyper-V (possibly with a
> module option to skip that check and always load it) but leaving the VMCI driver
> functional would be better,
> 
> Jorgen

Thank you for explaining the background!
Then I'll make a new patch, following your suggestion.

-- Dexuan