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

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Message-ID: <E1772BF8-8A8D-4768-AA8C-67EE8FE21D10@vmware.com>
Date:   Wed, 16 Aug 2017 19:44:47 +0000
From:   "Jorgen S. Hansen" <jhansen@...are.com>
To:     Dexuan Cui <decui@...rosoft.com>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
        KY Srinivasan <kys@...rosoft.com>,
        "Haiyang Zhang" <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        George Zhang <georgezhang@...are.com>,
        Michal Kubecek <mkubecek@...e.cz>, Asias He <asias@...hat.com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        "Vitaly Kuznetsov" <vkuznets@...hat.com>,
        Cathy Avery <cavery@...hat.com>,
        "jasowang@...hat.com" <jasowang@...hat.com>,
        Rolf Neugebauer <rolf.neugebauer@...ker.com>,
        Dave Scott <dave.scott@...ker.com>,
        "Marcelo Cerri" <marcelo.cerri@...onical.com>,
        "apw@...onical.com" <apw@...onical.com>,
        "olaf@...fle.de" <olaf@...fle.de>,
        "joe@...ches.com" <joe@...ches.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: Re: [PATCH net-next 1/3] VMCI: only load on VMware hypervisor


> On Aug 16, 2017, at 12:13 AM, Dexuan Cui <decui@...rosoft.com> wrote:
> 
> 
> 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 won’t be able to run Workstation nested in Linux VMs on Hyper-V. Since the VMCI driver itself isn’t 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,

Thanks,
Jorgen