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Re: [Qemu-devel] [Qemu-ppc] [QEMU-PPC] [RFC 1/3] hw/ppc/spapr_caps: Rewo

From: Murilo Opsfelder Araújo
Subject: Re: [Qemu-devel] [Qemu-ppc] [QEMU-PPC] [RFC 1/3] hw/ppc/spapr_caps: Rework spapr_caps to use uint8 internal representation
Date: Tue, 9 Jan 2018 09:13:00 -0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.5.0

On 01/09/2018 07:21 AM, Suraj Jitindar Singh wrote:
> Currently spapr_caps are tied to boolean values (on or off). This patch
> reworks the caps so that they can have any value between 0 and 127,
> inclusive. This allows more capabilities with various values to be
> represented in the same way internally. Capabilities are numbered in
> ascending order. The internal representation of capability values is an
> array of uint8s in the sPAPRMachineState, indexed by capability number.
> Note: The MSB (0x80) of a capability is reserved to track whether the
>       capability was set from the command line.
> Capabilities can have their own name, description, options, getter and
> setter functions, type and allow functions. They also each have their own
> section in the migration stream. Capabilities are only migrated if they
> were explictly set on the command line, with the assumption that
> otherwise the default will match.
> On migration we ensure that the capability value on the destination
> is greater than or equal to the capability value from the source. So
> long at this remains the case then the migration is considered
> compatible and allowed to continue.
> This patch implements generic getter and setter functions for boolean
> capabilities. It also converts the existings cap-htm, cap-vsx and
> cap-dfp capabilities to this new format.

Hi, Suraj.

I've got the impression that this patch does a lot of things. What about
splitting this patch into the following?

- rename spapr_has_cap() -> spapr_get_cap()
- introduce each spapr_cap_[gs]et_bool() in separate patches
- make use of spapr_cap[gs]et_bool()
- convert capabilities internal representation to uint8
- add each new capability separately

Perhaps it can be broken into even smaller changes.


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