[Qemu-devel] [PATCHv2 1/1] Add usb option in machine options to enable/disable usb

[Li Zhang <zhlcindy@linux.vnet.ibm.com>]

For pseries machine, it needs to enable usb to add
keyboard or usb mouse. -usb option won't be used in
the future, and machine options is a better way to
enable usb.

So this patch is to add usb option to machine options
(-machine type=psereis,usb=on/off)to enable/disable
usb controller.

In this patch, usb_on is an global option which can
be checked by machines.
For example, on pseries, it will check if usb_on is 1,
if it is 1, it will create one usb ohci controller.
As the following:
if (usb_on == 1) {
     pci_create_simple(bus, -1, "pci-ohci");
}

In this patch, usb is on by default. So, for -nodefault,
usb should be set off in the command line as the following:
 -machine type=pseries,usb=off.

Signed-off-by: Li Zhang <zhlcindy@linux.vnet.ibm.com>
---
 hw/spapr.c |    5 +++++
 sysemu.h   |    1 +
 vl.c       |   17 +++++++++++++++++
 3 files changed, 23 insertions(+)

diff --git a/hw/spapr.c b/hw/spapr.c
index d0bddbc..1feb739 100644
--- a/hw/spapr.c
+++ b/hw/spapr.c
@@ -661,6 +661,11 @@ static void ppc_spapr_init(ram_addr_t ram_size,
         spapr_vscsi_create(spapr->vio_bus);
     }
 
+    if (usb_on == 1) {
+        pci_create_simple(QLIST_FIRST(&spapr->phbs)->host_state.bus,
+                          -1, "pci-ohci");
+    }
+
     if (rma_size < (MIN_RMA_SLOF << 20)) {
         fprintf(stderr, "qemu: pSeries SLOF firmware requires >= "
                 "%ldM guest RMA (Real Mode Area memory)\n", MIN_RMA_SLOF);
diff --git a/sysemu.h b/sysemu.h
index bc2c788..08134ae 100644
--- a/sysemu.h
+++ b/sysemu.h
@@ -109,6 +109,7 @@ extern int vga_interface_type;
 #define vmsvga_enabled (vga_interface_type == VGA_VMWARE)
 #define qxl_enabled (vga_interface_type == VGA_QXL)
 
+extern int usb_on;
 extern int graphic_width;
 extern int graphic_height;
 extern int graphic_depth;
diff --git a/vl.c b/vl.c
index 204d85b..b200203 100644
--- a/vl.c
+++ b/vl.c
@@ -202,6 +202,7 @@ int smp_cpus = 1;
 int max_cpus = 0;
 int smp_cores = 1;
 int smp_threads = 1;
+int usb_on = 0;
 #ifdef CONFIG_VNC
 const char *vnc_display;
 #endif
@@ -758,6 +759,21 @@ static int bt_parse(const char *opt)
     return 1;
 }
 
+static int get_usb_opt(QemuOpts *opts)
+{
+    const char *usb_opt = NULL;
+    int usb_on = 0;
+
+    if (NULL == qemu_opt_get(opts, "usb"))
+        qemu_opt_set(opts, "usb", "on");
+
+    usb_opt = qemu_opt_get(opts, "usb");
+    if (usb_opt && strcmp(usb_opt, "on") == 0)
+        usb_on = 1;
+
+    return usb_on;
+}
+
 /***********************************************************/
 /* QEMU Block devices */
 
@@ -3356,6 +3372,7 @@ int main(int argc, char **argv, char **envp)
         kernel_filename = qemu_opt_get(machine_opts, "kernel");
         initrd_filename = qemu_opt_get(machine_opts, "initrd");
         kernel_cmdline = qemu_opt_get(machine_opts, "append");
+        usb_on = get_usb_opt(machine_opts);
     } else {
         kernel_filename = initrd_filename = kernel_cmdline = NULL;
     }
-- 
1.7.9.5