Re: [Xen-devel] [Qemu-devel] [PATCH v2 3/8] hw: Default -drive to if=none instead of ide when ide cannot work

[Thomas Huth <thuth@xxxxxxxxxx>]

On 26.01.2017 16:09, Markus Armbruster wrote:
> Block backends defined with -drive if=ide are meant to be picked up by
> machine initialization code: a suitable frontend gets created and
> wired up automatically.
> 
> if=ide drives not picked up that way can still be used with -device as
> if they had if=none, but that's unclean and best avoided.  Unused ones
> produce an "Orphaned drive without device" warning.
> 
> -drive parameter "if" is optional, and the default depends on the
> machine type.  If a machine type doesn't specify a default, the
> default is "ide".
> 
> Many machine types implicitly default to if=ide that way, even though
> they don't actually have an IDE controller.  This makes no sense.
> 
> Change the implicit default to if=none.  Affected machines:
> 
> * all targets: none
> * aarch64/arm: akita ast2500 canon cheetah collie connex imx25
>   integratorcp kzm lm3s6965evb lm3s811evb mainstone musicpal n800 n810
>   netduino2 nuri palmetto realview romulus sabrelite smdkc210 sx1 sx1
>   verdex z2
> * cris: axis-dev88
> * i386/x86_64: xenpv
> * lm32: lm32-evr lm32-uclinux milkymist
> * m68k: an5206 dummy mcf5208evb
> * microblaze/microblazeel: petalogix-ml605 petalogix-s3adsp1800
> * mips/mips64/mips64el/mipsel: mipssim
> * moxie: moxiesim
> * or32: or32-sim
> * ppc/ppc64/ppcemb: bamboo ref405ep taihu virtex-ml507
> * ppc/ppc64: mpc8544ds ppce500
> * sh4/sh4eb: shix
> * sparc: leon3_generic
> * sparc64: niagara
> * tricore: tricore_testboard
> * unicore32: puv3
> * xtensa/xtensaeb: kc705 lx200 lx60 ml605 sim
> 
> None of these machines have an IDE controller, let alone code to
> honor if=ide.
> 
> Cc: Peter Maydell <peter.maydell@xxxxxxxxxx>
> Cc: qemu-arm@xxxxxxxxxx
> Cc: Edgar E. Iglesias <edgar.iglesias@xxxxxxxxx>
> Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
> Cc: Anthony Perard <anthony.perard@xxxxxxxxxx>
> Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
> Cc: Michael Walle <michael@xxxxxxxx>
> Cc: Laurent Vivier <laurent@xxxxxxxxx>
> Cc: Anthony Green <green@xxxxxxxxxxxxxx>
> Cc: Jia Liu <proljc@xxxxxxxxx>
> Cc: Alexander Graf <agraf@xxxxxxx>
> Cc: qemu-ppc@xxxxxxxxxx
> Cc: Magnus Damm <magnus.damm@xxxxxxxxx>
> Cc: Fabien Chouteau <chouteau@xxxxxxxxxxx>
> Cc: Mark Cave-Ayland <mark.cave-ayland@xxxxxxxxxxxx>
> Cc: Artyom Tarasenko <atar4qemu@xxxxxxxxx>
> Cc: Bastian Koppelmann <kbastian@xxxxxxxxxxxxxxxxxxxxx>
> Cc: Guan Xuetao <gxt@xxxxxxxxxxxxxxx>
> Cc: Max Filippov <jcmvbkbc@xxxxxxxxx>
> Signed-off-by: Markus Armbruster <armbru@xxxxxxxxxx>
> Acked-By: Artyom Tarasenko <atar4qemu@xxxxxxxxx>
> ---
>  include/sysemu/blockdev.h | 9 ++++-----
>  1 file changed, 4 insertions(+), 5 deletions(-)
> 
> diff --git a/include/sysemu/blockdev.h b/include/sysemu/blockdev.h
> index 16432f3..351a039 100644
> --- a/include/sysemu/blockdev.h
> +++ b/include/sysemu/blockdev.h
> @@ -19,12 +19,11 @@ void blockdev_auto_del(BlockBackend *blk);
>  typedef enum {
>      IF_DEFAULT = -1,            /* for use with drive_add() only */
>      /*
> -     * IF_IDE must be zero, because we want MachineClass member
> -     * block_default_type to default-initialize to IF_IDE
> +     * IF_NONE must be zero, because we want MachineClass member
> +     * block_default_type to default-initialize to IF_NONE
>       */
> -    IF_IDE = 0,
> -    IF_NONE,
> -    IF_SCSI, IF_FLOPPY, IF_PFLASH, IF_MTD, IF_SD, IF_VIRTIO, IF_XEN,
> +    IF_NONE = 0,
> +    IF_IDE, IF_SCSI, IF_FLOPPY, IF_PFLASH, IF_MTD, IF_SD, IF_VIRTIO, IF_XEN,
>      IF_COUNT
>  } BlockInterfaceType;
>  
> 

Makes sense.

Reviewed-by: Thomas Huth <thuth@xxxxxxxxxx>


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