Re: [PATCH v3 0/4] Improve default object property_add uint helpers

[Stefan Hajnoczi <stefanha@redhat.com>]

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On Fri, Nov 29, 2019 at 05:46:47PM +0000, Felipe Franciosi wrote:
> This improves the family of object_property_add_uintXX_ptr helpers by enabling
> a default getter/setter only when desired. To prevent an API behavioural change
> (from clients that already used these helpers and did not want a setter), we
> add a OBJ_PROP_FLAG_READ flag that allow clients to only have a getter. Patch 1
> enhances the API and modify current users.
> 
> While modifying the clients of the API, a couple of improvement opportunities
> were observed in ich9. These were added in separate patches (2 and 3).
> 
> Patch 3 cleans up a lot of existing code by moving various objects to the
> enhanced API. Previously, those objects had their own getters/setters that only
> updated the values without further checks. Some of them actually lacked a check
> for setting overflows, which could have resulted in undesired values being set.
> The new default setters include a check for that, not updating the values in
> case of errors (and propagating them). If they did not provide an error
> pointer, then that behaviour was maintained.
> 
> 
> Felipe Franciosi (4):
>   qom/object: enable setter for uint types
>   ich9: fix getter type for sci_int property
>   ich9: Simplify ich9_lpc_initfn
>   qom/object: Use common get/set uint helpers
> 
>  hw/acpi/ich9.c       |  99 ++------------------
>  hw/acpi/pcihp.c      |   7 +-
>  hw/acpi/piix4.c      |  12 +--
>  hw/isa/lpc_ich9.c    |  27 ++----
>  hw/misc/edu.c        |  13 +--
>  hw/pci-host/q35.c    |  14 +--
>  hw/ppc/spapr.c       |  18 +---
>  hw/ppc/spapr_drc.c   |   3 +-
>  hw/vfio/pci-quirks.c |  20 ++--
>  include/qom/object.h |  44 +++++++--
>  memory.c             |  15 +--
>  qom/object.c         | 216 ++++++++++++++++++++++++++++++++++++++-----
>  target/arm/cpu.c     |  22 +----
>  target/i386/sev.c    | 106 ++-------------------
>  ui/console.c         |   4 +-
>  15 files changed, 288 insertions(+), 332 deletions(-)
> 
> -- 
> 2.20.1
> 
> Changelog:
> v1->v2:
> - Update sci_int directly instead of using stack variable
> - Defining an enhanced ObjectPropertyFlags instead of just 'readonly'
> - Erroring out directly (instead of using gotos) on default setters
> - Retaining lack of errp passing when it wasn't there
> v2->v3:
> - Rename flags _RD to _READ and _WR to _WRITE
> - Add a convenience _READWRITE flag
> - Drop the usage of UL in the bit flag definitions

Modulo the review comments that have already been raised:

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>

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