libxl: Disable relocating memory for qemu-xen in stubdomain too

According to comments (and experiments) qemu-xen cannot handle memory
reolcation done by hvmloader. The code was already disabled when running
qemu-xen in dom0 (see libxl__spawn_local_dm()), but it was missed when
adding qemu-xen support to stubdomain. Adjust libxl__spawn_stub_dm() to
be consistent in this regard.

Reported-by: Neowutran <xen@neowutran.ovh>
Signed-off-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Reviewed-by: Jason Andryuk <jandryuk@gmail.com>
Acked-by: Anthony PERARD <anthony.perard@citrix.com>
master commit: 97883aa269
master date: 2024-02-22 11:48:22 +0100

tools/libs/light/libxl_dm.c

@@ -2432,6 +2432,16 @@ void libxl__spawn_stub_dm(libxl__egc *egc, libxl__stub_dm_spawn_state *sdss)
                         "%s",
                         libxl_bios_type_to_string(guest_config->b_info.u.hvm.bios));
     }
+    /* Disable relocating memory to make the MMIO hole larger
+     * unless we're running qemu-traditional and vNUMA is not
+     * configured. */
+    libxl__xs_printf(gc, XBT_NULL,
+                     libxl__sprintf(gc, "%s/hvmloader/allow-memory-relocate",
+                                    libxl__xs_get_dompath(gc, guest_domid)),
+                     "%d",
+                     guest_config->b_info.device_model_version
+                        == LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN_TRADITIONAL &&
+                     !libxl__vnuma_configured(&guest_config->b_info));
     ret = xc_domain_set_target(ctx->xch, dm_domid, guest_domid);
     if (ret<0) {
         LOGED(ERROR, guest_domid, "setting target domain %d -> %d",