[v2,0/2] modules: Improve modinfo.c support

Message

Jose R. Ziviani Sept. 27, 2021, 2:11 p.m. UTC

This patchset introduces the modinfo_need and changes
modinfo-generate.py/meson.build to generate/link one modinfo per target.

modinfo-generate.py will know, thanks to modinfo_need, which modules are
currently enabled for a given target before adding it in the array of
modules. It will give a hint about why some modules failed, so
developers can have a clue about it:

},{
    /* hw-display-qxl.modinfo */
    /* module  QXL is missing. */

    /* hw-display-virtio-gpu.modinfo */
    .name = "hw-display-virtio-gpu",
    .objs = ((const char*[]){  "virtio-gpu-base",  "virtio-gpu-device",  "vhost-user-gpu", NULL }),
},{

The main reason of this change is to fix problems like:
$ ./qemu-system-s390x -nodefaults -display none -accel tcg -M none -device help | head
Failed to open module: /.../hw-display-qxl.so: undefined symbol: vga_ioport_read
Failed to open module: /.../hw-display-virtio-vga.so: undefined symbol: vmstate_vga_common
Failed to open module: /.../hw-display-virtio-vga.so: undefined symbol: vmstate_vga_common
Failed to open module: /.../hw-display-virtio-vga-gl.so: undefined symbol: have_vga
Failed to open module: /.../hw-usb-smartcard.so: undefined symbol: ccid_card_ccid_attach
Failed to open module: /.../hw-usb-redirect.so: undefined symbol: vmstate_usb_device
Failed to open module: /.../hw-usb-host.so: undefined symbol: vmstate_usb_device

With this patch, I run this small script successfuly:
#!/bin/bash
    pushd ~/suse/virtualization/qemu/build
    for qemu in qemu-system-*
    do
        [[ -f "$qemu" ]] || continue
        res=$(./$qemu -nodefaults -display none -accel tcg -M none -device help 2>&1 | grep "Failed to" > /dev/null; echo $?)
        [[ $res -eq 0 ]] && echo "Error: $qemu"
    done
    popd

Also run make check and check-acceptance without any failures.

Todo:
 - accelerators can be filtered as well (this only covers the device
   part), then the field QemuModinfo.arch can be removed.

v1 -> v2:
 - Changed the approach to this problem after suggestions made by Paolo and Gerd.

Thank you!

Jose R. Ziviani (2):
  modules: introduces module_needs directive
  modules: generates per-target modinfo

 hw/display/qxl.c                |  1 +
 hw/display/vhost-user-gpu-pci.c |  1 +
 hw/display/vhost-user-gpu.c     |  1 +
 hw/display/vhost-user-vga.c     |  1 +
 hw/display/virtio-gpu-base.c    |  1 +
 hw/display/virtio-gpu-gl.c      |  1 +
 hw/display/virtio-gpu-pci-gl.c  |  1 +
 hw/display/virtio-gpu-pci.c     |  1 +
 hw/display/virtio-gpu.c         |  1 +
 hw/display/virtio-vga-gl.c      |  1 +
 hw/display/virtio-vga.c         |  1 +
 hw/s390x/virtio-ccw-gpu.c       |  1 +
 hw/usb/ccid-card-emulated.c     |  1 +
 hw/usb/ccid-card-passthru.c     |  1 +
 hw/usb/host-libusb.c            |  1 +
 hw/usb/redirect.c               |  1 +
 include/qemu/module.h           | 10 +++++++++
 meson.build                     | 25 ++++++++++++++-------
 scripts/modinfo-generate.py     | 40 ++++++++++++++++++++-------------
 19 files changed, 67 insertions(+), 24 deletions(-)