Re: [PATCH v3 00/11] hw: Strengthen SysBus & QBus API

[Paolo Bonzini <pbonzini@redhat.com>]

On 2/8/24 19:12, Philippe Mathieu-Daudé wrote:
> Hi,
> 
> This series ensure following is called *before* a
> device is realized:
> - qbus_new()
> - sysbus_init_mmio()
> - qdev_init_gpio_in_named_with_opaque()
> 
> and these are called *after* it is:
> - sysbus_mmio_map()
> - sysbus_connect_irq(),
> - qdev_connect_gpio_out()
> - qdev_connect_gpio_out_named()

This series is missing a _why_.  The original vision for qdev was that 
the whole machine would be realized at once from vl.c, and therefore 
there would be no need for realizing subcomponents by hand.

This probably will never happen, but it is still worth explaining why 
it's now considered so conceptually wrong, that it is (or will be) 
enforced by the API.

Paolo

> Patches from v2 enforcing these checks will be posted
> in a separate series.
> 
> Philippe Mathieu-Daudé (11):
>    hw/ide/ich9: Use AHCIPCIState typedef
>    hw/rx/rx62n: Reduce inclusion of 'qemu/units.h'
>    hw/rx/rx62n: Only call qdev_get_gpio_in() when necessary
>    hw/i386/pc_q35: Realize LPC PCI function before accessing it
>    hw/ppc/prep: Realize ISA bridge before accessing it
>    hw/misc/macio: Realize IDE controller before accessing it
>    hw/sh4/r2d: Realize IDE controller before accessing it
>    hw/sparc/sun4m: Realize DMA controller before accessing it
>    hw/sparc/leon3: Realize GRLIB IRQ controller before accessing it
>    hw/sparc/leon3: Initialize GPIO before realizing CPU devices
>    hw/sparc64/cpu: Initialize GPIO before realizing CPU devices
> 
>   include/hw/rx/rx62n.h |  2 --
>   hw/i386/pc_q35.c      |  2 +-
>   hw/ide/ich.c          |  6 +++---
>   hw/misc/macio/macio.c |  8 +++++---
>   hw/ppc/prep.c         |  2 +-
>   hw/rx/rx-gdbsim.c     |  1 +
>   hw/rx/rx62n.c         | 17 +++++++++--------
>   hw/sh4/r2d.c          |  2 +-
>   hw/sparc/leon3.c      | 11 ++++++-----
>   hw/sparc/sun4m.c      |  7 +++++--
>   hw/sparc64/sparc64.c  |  4 +++-
>   11 files changed, 35 insertions(+), 27 deletions(-)
>