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

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Message-ID: <KL1P15301MB00083C97259FF2A700C78442BF8D0@KL1P15301MB0008.APCP153.PROD.OUTLOOK.COM>
Date:   Tue, 15 Aug 2017 22:13:29 +0000
From:   Dexuan Cui <decui@...rosoft.com>
To:     "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>
CC:     KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        George Zhang <georgezhang@...are.com>,
        Jorgen Hansen <jhansen@...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: [PATCH net-next 1/3] VMCI: only load on VMware hypervisor


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.

On the other hand, hv_sock.ko can only load on Hyper-V, because it
depends on hv_vmbus.ko, which detects Hyper-V in hv_acpi_init().

KVM's vsock_virtio_transport doesn't have the issue because it doesn't
define MODULE_ALIAS_NETPROTO(PF_VSOCK).

Signed-off-by: Dexuan Cui <decui@...rosoft.com>
Cc: Alok Kataria <akataria@...are.com>
Cc: Andy King <acking@...are.com>
Cc: Adit Ranadive <aditr@...are.com>
Cc: George Zhang <georgezhang@...are.com>
Cc: Jorgen Hansen <jhansen@...are.com>
Cc: K. Y. Srinivasan <kys@...rosoft.com>
Cc: Haiyang Zhang <haiyangz@...rosoft.com>
Cc: Stephen Hemminger <sthemmin@...rosoft.com>
---
 drivers/misc/vmw_vmci/vmci_driver.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/misc/vmw_vmci/vmci_driver.c b/drivers/misc/vmw_vmci/vmci_driver.c
index d7eaf1e..1789ea7 100644
--- a/drivers/misc/vmw_vmci/vmci_driver.c
+++ b/drivers/misc/vmw_vmci/vmci_driver.c
@@ -19,6 +19,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
+#include <linux/hypervisor.h>
 
 #include "vmci_driver.h"
 #include "vmci_event.h"
@@ -58,6 +59,13 @@ static int __init vmci_drv_init(void)
 	int vmci_err;
 	int error;
 
+	/*
+	 * Check if we are running on VMware's hypervisor and bail out
+	 * if we are not.
+	 */
+	if (x86_hyper != &x86_hyper_vmware)
+		return -ENODEV;
+
 	vmci_err = vmci_event_init();
 	if (vmci_err < VMCI_SUCCESS) {
 		pr_err("Failed to initialize VMCIEvent (result=%d)\n",
-- 
2.7.4