Re: [PATCH v3 4/4] blockdev: Drop deprecated bogus -drive interface type

[Daniel P . Berrangé]

On Tue, Mar 09, 2021 at 05:12:13PM +0100, Markus Armbruster wrote:
> Drop the crap deprecated in commit a1b40bda08 "blockdev: Deprecate
> -drive with bogus interface type" (v5.1.0).
> 
> Signed-off-by: Markus Armbruster <armbru@redhat.com>
> ---
>  docs/system/deprecated.rst       |  7 ------
>  docs/system/removed-features.rst |  7 ++++++
>  include/sysemu/blockdev.h        |  1 -
>  blockdev.c                       | 37 +++++++++++++-------------------
>  softmmu/vl.c                     |  8 +------
>  5 files changed, 23 insertions(+), 37 deletions(-)
> 
> diff --git a/docs/system/deprecated.rst b/docs/system/deprecated.rst
> index 601e9647a5..664ed60e9f 100644
> --- a/docs/system/deprecated.rst
> +++ b/docs/system/deprecated.rst
> @@ -94,13 +94,6 @@ QEMU 5.1 has three options:
>        to the user to load all the images they need.
>   3. ``-bios <file>`` - Tells QEMU to load the specified file as the firmwrae.
>  
> -``-drive`` with bogus interface type (since 5.1)
> -''''''''''''''''''''''''''''''''''''''''''''''''
> -
> -Drives with interface types other than ``if=none`` are for onboard
> -devices.  It is possible to use drives the board doesn't pick up with
> --device.  This usage is now deprecated.  Use ``if=none`` instead.
> -
>  Short-form boolean options (since 6.0)
>  ''''''''''''''''''''''''''''''''''''''
>  
> diff --git a/docs/system/removed-features.rst 
> b/docs/system/removed-features.rst
> index 77e7ba1339..e6d2fbe798 100644
> --- a/docs/system/removed-features.rst
> +++ b/docs/system/removed-features.rst
> @@ -87,6 +87,13 @@ becomes
>      -device isa-fdc,...
>      -device floppy,unit=1,drive=...
>  
> +``-drive`` with bogus interface type (removed in 6.0)
> +'''''''''''''''''''''''''''''''''''''''''''''''''''''
> +
> +Drives with interface types other than ``if=none`` are for onboard
> +devices.  Drives the board doesn't pick up can no longer be used with
> +-device.  Use ``if=none`` instead.
> +
>  QEMU Machine Protocol (QMP) commands
>  ------------------------------------
>  
> diff --git a/include/sysemu/blockdev.h b/include/sysemu/blockdev.h
> index 3b5fcda08d..32c2d6023c 100644
> --- a/include/sysemu/blockdev.h
> +++ b/include/sysemu/blockdev.h
> @@ -35,7 +35,6 @@ struct DriveInfo {
>      bool is_default;            /* Added by default_drive() ?  */
>      int media_cd;
>      QemuOpts *opts;
> -    bool claimed_by_board;
>      QTAILQ_ENTRY(DriveInfo) next;
>  };
>  
> diff --git a/blockdev.c b/blockdev.c
> index cd438e60e3..2e01889cff 100644
> --- a/blockdev.c
> +++ b/blockdev.c
> @@ -240,19 +240,10 @@ DriveInfo *drive_get(BlockInterfaceType type, int bus, 
> int unit)
>      return NULL;
>  }
>  
> -void drive_mark_claimed_by_board(void)
> -{
> -    BlockBackend *blk;
> -    DriveInfo *dinfo;
> -
> -    for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
> -        dinfo = blk_legacy_dinfo(blk);
> -        if (dinfo && blk_get_attached_dev(blk)) {
> -            dinfo->claimed_by_board = true;
> -        }
> -    }
> -}
> -
> +/*
> + * Check board claimed all -drive that are meant to be claimed.
> + * Fatal error if any remain unclaimed.
> + */
>  void drive_check_orphaned(void)
>  {
>      BlockBackend *blk;
> @@ -262,7 +253,17 @@ void drive_check_orphaned(void)
>  
>      for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
>          dinfo = blk_legacy_dinfo(blk);
> -        if (dinfo->is_default || dinfo->type == IF_NONE) {
> +        /*
> +         * Ignore default drives, because we create certain default
> +         * drives unconditionally, then leave them unclaimed.  Not the
> +         * users fault.
> +         * Ignore IF_VIRTIO, because it gets desugared into -device,
> +         * so we can leave failing to -device.
> +         * Ignore IF_NONE, because leaving unclaimed IF_NONE remains
> +         * available for device_add is a feature.
> +         */
> +        if (dinfo->is_default || dinfo->type == IF_VIRTIO
> +            || dinfo->type == IF_NONE) {
>              continue;
>          }
>          if (!blk_get_attached_dev(blk)) {
> @@ -273,14 +274,6 @@ void drive_check_orphaned(void)
>                           if_name[dinfo->type], dinfo->bus, dinfo->unit);
>              loc_pop(&loc);
>              orphans = true;
> -            continue;
> -        }
> -        if (!dinfo->claimed_by_board && dinfo->type != IF_VIRTIO) {
> -            loc_push_none(&loc);
> -            qemu_opts_loc_restore(dinfo->opts);
> -            warn_report("bogus if=%s is deprecated, use if=none",
> -                        if_name[dinfo->type]);
> -            loc_pop(&loc);
>          }
>      }
>  
> diff --git a/softmmu/vl.c b/softmmu/vl.c
> index ff488ea3e7..7453611152 100644
> --- a/softmmu/vl.c
> +++ b/softmmu/vl.c
> @@ -2460,13 +2460,7 @@ static void qemu_init_board(void)
>      /* From here on we enter MACHINE_PHASE_INITIALIZED.  */
>      machine_run_board_init(current_machine);
>  
> -    /*
> -     * TODO To drop support for deprecated bogus if=..., move
> -     * drive_check_orphaned() here, replacing this call.  Also drop
> -     * its deprecation warning, along with DriveInfo member
> -     * @claimed_by_board.
> -     */
> -    drive_mark_claimed_by_board();
> +    drive_check_orphaned();

This method is already called by qemu_machine_creation_done(), which is
invoked shortly after this qemu_init_board() is run.

So either this added instance, or the later call to drive_check_orphaned
feels redundant

Regards,
Daniel
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