[PATCH v2 0/2] s390x/cpumodel: Introduce dynamic feature group

[David Hildenbrand]

This thread was previously called:
    s390x/cpumodel: Introduce "best" model variants

There was recently a discussion regarding CPU model versions. That concept
does not fit s390x where we have a lot of feature variability. I
proposed an alternative approach in [1], which might work for x86 as well
(but I am not sure if x86 still can or wants to switch to that), and
requires only little changes in upper layers.

[1] and patch #2 contains more information on the motivation for this. It
allows, for example, to specify/expand "best feature set possible on this
accelerator, hw and, firmware"

"
    Get the best possible feature set (e.g., excluding deprecated features)
    for a CPU definition in the configuration
        -cpu z14,all-features=off,recommended-features=on

    Get the maximum possible feature set (e.g., including deprecated
    features) for a CPU definition in the configuration ("everything that
    could be enabled"):
        -cpu z14,all-features=off,available-features=on

    Get all valid features for a CPU definition:
        -cpu z14,all-features=on
"

v1 -> v2:
- Use dynamic feature groups instead of new models

[1] https://lists.gnu.org/archive/html/qemu-devel/2019-10/msg07222.html

Cc: Daniel P. Berrangé <address@hidden>
Cc: Markus Armbruster <address@hidden>
Cc: Jiri Denemark <address@hidden>
Cc: Eduardo Habkost <address@hidden>
Cc: Michael Mueller <address@hidden>
Cc: Peter Maydell <address@hidden>

David Hildenbrand (2):
  s390x/cpumodel: Factor out CPU feature dependencies
  s390x/cpumodel: Introduce dynamic feature groups

 target/s390x/cpu_features.c |  29 +++++
 target/s390x/cpu_features.h |  14 +++
 target/s390x/cpu_models.c   | 242 +++++++++++++++++++++++++++---------
 3 files changed, 228 insertions(+), 57 deletions(-)

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2.21.0