usb-linux: add hostport property

This patch adds a hostport property which allows to specify the host usb
devices to pass through by bus number and physical port.  This means you
can basically hand over one (or more) of the usb plugs on your host to
the guest and whatever device is plugged in there will show up in the
guest.

Usage:

  -device usb-host,hostbus=1,hostport=1

You can figure the port numbers by plugging in some usb device, then
find it in "info usbhost" and pick bus and port specified there.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

1 files changed, 7 insertions, 2 deletions

diff --git a/usb-linux.c b/usb-linux.c
index 2c6e249bc..55d914d39 100644
--- a/usb-linux.c
+++ b/usb-linux.c
@@ -104,6 +104,7 @@ struct endp_data {
 struct USBAutoFilter {
     uint32_t bus_num;
     uint32_t addr;
+    char     *port;
     uint32_t vendor_id;
     uint32_t product_id;
 };
@@ -1162,6 +1163,7 @@ static struct USBDeviceInfo usb_host_dev_info = {
     .qdev.props     = (Property[]) {
         DEFINE_PROP_UINT32("hostbus",  USBHostDevice, match.bus_num,    0),
         DEFINE_PROP_UINT32("hostaddr", USBHostDevice, match.addr,       0),
+        DEFINE_PROP_STRING("hostport", USBHostDevice, match.port),
         DEFINE_PROP_HEX32("vendorid",  USBHostDevice, match.vendor_id,  0),
         DEFINE_PROP_HEX32("productid", USBHostDevice, match.product_id, 0),
         DEFINE_PROP_END_OF_LIST(),
@@ -1580,6 +1582,9 @@ static int usb_host_auto_scan(void *opaque, int bus_num, int addr, char *port,
         if (f->addr > 0 && f->addr != addr) {
             continue;
         }
+        if (f->port != NULL && (port == NULL || strcmp(f->port, port) != 0)) {
+            continue;
+        }
 
         if (f->vendor_id > 0 && f->vendor_id != vendor_id) {
             continue;
@@ -1805,7 +1810,7 @@ void usb_host_info(Monitor *mon)
         dec2str(f->addr, addr, sizeof(addr));
         hex2str(f->vendor_id, vid, sizeof(vid));
         hex2str(f->product_id, pid, sizeof(pid));
-        monitor_printf(mon, "    Device %s.%s ID %s:%s\n",
-                       bus, addr, vid, pid);
+        monitor_printf(mon, "    Bus %s, Addr %s, Port %s, ID %s:%s\n",
+                       bus, addr, f->port ? f->port : "*", vid, pid);
     }
 }