[PATCH 2/2] kvm tools: Make host side IP configurable

[Sasha Levin <levinsasha928@gmail.com>]

Add --host-ip-addr parameter to allow changing the host-side IP address.

Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
---
 tools/kvm/include/kvm/virtio-net.h |    2 +-
 tools/kvm/kvm-run.c                |    9 ++++++++-
 tools/kvm/virtio-net.c             |    9 ++++-----
 3 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/tools/kvm/include/kvm/virtio-net.h b/tools/kvm/include/kvm/virtio-net.h
index a1cab15..03eb623 100644
--- a/tools/kvm/include/kvm/virtio-net.h
+++ b/tools/kvm/include/kvm/virtio-net.h
@@ -2,6 +2,6 @@
 #define KVM__VIRTIO_NET_H
 
 struct kvm;
-void virtio_net__init(struct kvm *self);
+void virtio_net__init(struct kvm *self, const char* host_ip_addr);
 
 #endif /* KVM__VIRTIO_NET_H */
diff --git a/tools/kvm/kvm-run.c b/tools/kvm/kvm-run.c
index 6046a0a..910a8d8 100644
--- a/tools/kvm/kvm-run.c
+++ b/tools/kvm/kvm-run.c
@@ -31,6 +31,7 @@
 #define DEFAULT_KVM_DEV		"/dev/kvm"
 #define DEFAULT_CONSOLE		"serial"
 #define DEFAULT_NETWORK		"none"
+#define DEFAULT_HOST_ADDR	"192.168.33.2"
 
 #define MB_SHIFT		(20)
 #define MIN_RAM_SIZE_MB		(64ULL)
@@ -66,6 +67,7 @@ static const char *image_filename;
 static const char *console;
 static const char *kvm_dev;
 static const char *network;
+static const char *host_ip_addr;
 static bool single_step;
 static bool readonly_image;
 extern bool ioport_debug;
@@ -89,6 +91,8 @@ static const struct option options[] = {
 			"Console to use"),
 	OPT_STRING('n', "network", &network, "virtio",
 			"Network to use"),
+	OPT_STRING('\0', "host-ip-addr", &host_ip_addr, "a.b.c.d",
+			"Assign this address to the host side networking"),
 
 	OPT_GROUP("Kernel options:"),
 	OPT_STRING('k', "kernel", &kernel_filename, "kernel",
@@ -218,6 +222,9 @@ int kvm_cmd_run(int argc, const char **argv, const char *prefix)
 	else
 		active_console  = CONSOLE_8250;
 
+	if (!host_ip_addr)
+		host_ip_addr = DEFAULT_HOST_ADDR;
+
 	term_init();
 
 	kvm = kvm__init(kvm_dev, ram_size);
@@ -259,7 +266,7 @@ int kvm_cmd_run(int argc, const char **argv, const char *prefix)
 		network = DEFAULT_NETWORK;
 
 	if (!strncmp(network, "virtio", 6))
-		virtio_net__init(kvm);
+		virtio_net__init(kvm, host_ip_addr);
 
 	kvm__start_timer(kvm);
 
diff --git a/tools/kvm/virtio-net.c b/tools/kvm/virtio-net.c
index 5f9bf07..ec65779 100644
--- a/tools/kvm/virtio-net.c
+++ b/tools/kvm/virtio-net.c
@@ -276,7 +276,7 @@ static struct pci_device_header virtio_net_pci_device = {
 	.irq_line		= VIRTIO_NET_IRQ,
 };
 
-static void virtio_net__tap_init(void)
+static void virtio_net__tap_init(const char *host_ip_addr)
 {
 	struct ifreq ifr;
 	int sock = socket(AF_INET, SOCK_STREAM, 0);
@@ -298,8 +298,7 @@ static void virtio_net__tap_init(void)
 
 	strncpy(ifr.ifr_name, net_device.tap_name, sizeof(net_device.tap_name));
 
-	/*FIXME: Remove this after user can specify ip address and netmask*/
-	((struct sockaddr_in *)(&(ifr.ifr_addr)))->sin_addr.s_addr = inet_addr("192.168.33.2");
+	((struct sockaddr_in *)(&(ifr.ifr_addr)))->sin_addr.s_addr = inet_addr(host_ip_addr);
 	ifr.ifr_addr.sa_family = AF_INET;
 
 	if (ioctl(sock, SIOCSIFADDR, &ifr) < 0)
@@ -327,11 +326,11 @@ static void virtio_net__io_thread_init(struct kvm *self)
 	pthread_create(&net_device.io_tx_thread, NULL, virtio_net_tx_thread, (void *)self);
 }
 
-void virtio_net__init(struct kvm *self)
+void virtio_net__init(struct kvm *self, const char* host_ip_addr)
 {
 	pci__register(&virtio_net_pci_device, PCI_VIRTIO_NET_DEVNUM);
 	ioport__register(IOPORT_VIRTIO_NET, &virtio_net_io_ops, IOPORT_VIRTIO_NET_SIZE);
 
-	virtio_net__tap_init();
+	virtio_net__tap_init(host_ip_addr);
 	virtio_net__io_thread_init(self);
 }
-- 
1.7.5.rc1