[xen staging] libs/light: pass some infos to qemu

[patchbot@xxxxxxx]

commit c2517364eb64088abe7afba79e13cb1ba5a12585
Author:     Manuel Bouyer <bouyer@xxxxxxxxxx>
AuthorDate: Tue Jan 26 23:47:58 2021 +0100
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Fri Jan 29 22:50:08 2021 +0000

    libs/light: pass some infos to qemu
    
    Pass bridge name to qemu as command line option
    When starting qemu, set an environnement variable XEN_DOMAIN_ID,
    to be used by qemu helper scripts
    The only functional difference of using the br parameter is that the
    bridge name gets passed to the QEMU script.
    NetBSD doesn't have the ioctl to rename network interfaces implemented, and
    thus cannot rename the interface from tapX to vifX.Y-emu. Only qemu knowns
    the tap interface name, so we need to use the qemu script from qemu itself.
    
    Signed-off-by: Manuel Bouyer <bouyer@xxxxxxxxxx>
    Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
 tools/libs/light/libxl_dm.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tools/libs/light/libxl_dm.c b/tools/libs/light/libxl_dm.c
index 45a0504a2e..291dee9b3f 100644
--- a/tools/libs/light/libxl_dm.c
+++ b/tools/libs/light/libxl_dm.c
@@ -761,6 +761,8 @@ static int libxl__build_device_model_args_old(libxl__gc *gc,
         int nr_set_cpus = 0;
         char *s;
 
+        flexarray_append_pair(dm_envs, "XEN_DOMAIN_ID", GCSPRINTF("%d", 
domid));
+
         if (b_info->kernel) {
             LOGD(ERROR, domid, "HVM direct kernel boot is not supported by "
                  "qemu-xen-traditional");
@@ -1547,8 +1549,10 @@ static int libxl__build_device_model_args_new(libxl__gc 
*gc,
                 flexarray_append(dm_args, "-netdev");
                 flexarray_append(dm_args,
                                  GCSPRINTF("type=tap,id=net%d,ifname=%s,"
+                                           "br=%s,"
                                            "script=%s,downscript=%s",
                                            nics[i].devid, ifname,
+                                           nics[i].bridge,
                                            libxl_tapif_script(gc),
                                            libxl_tapif_script(gc)));
 
@@ -1825,6 +1829,8 @@ static int libxl__build_device_model_args_new(libxl__gc 
*gc,
     flexarray_append(dm_args, GCSPRINTF("%"PRId64, ram_size));
 
     if (b_info->type == LIBXL_DOMAIN_TYPE_HVM) {
+        flexarray_append_pair(dm_envs, "XEN_DOMAIN_ID", GCSPRINTF("%d", 
guest_domid));
+
         if (b_info->u.hvm.hdtype == LIBXL_HDTYPE_AHCI)
             flexarray_append_pair(dm_args, "-device", "ahci,id=ahci0");
         for (i = 0; i < num_disks; i++) {
--
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