Re: [PATCHv2 3/3] qemu_monitor: query-cpu-model-baseline QMP command

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$SUBJ:

qemu: Introduce qemuMonitorGetCPUModelBaseline


On 04/19/2018 12:06 AM, Chris Venteicher wrote:
> Function qemuMonitorGetCPUModelBaseline exposed to carry out a QMP
>  query-cpu-model-baseline transaction with QEMU.
> 
>  QEMU determines a baseline CPU Model from two input CPU Models to
>  complete the query-cpu-model-baseline transaction.
> ---
>  src/qemu/qemu_monitor.c      | 13 ++++++++++
>  src/qemu/qemu_monitor.h      |  5 ++++
>  src/qemu/qemu_monitor_json.c | 57 ++++++++++++++++++++++++++++++++++++++++++++
>  src/qemu/qemu_monitor_json.h |  7 ++++++
>  4 files changed, 82 insertions(+)
> 
> diff --git a/src/qemu/qemu_monitor.c b/src/qemu/qemu_monitor.c
> index 7b647525b..c1098ff72 100644
> --- a/src/qemu/qemu_monitor.c
> +++ b/src/qemu/qemu_monitor.c
> @@ -3874,6 +3874,19 @@ qemuMonitorCPUModelInfoCopy(const qemuMonitorCPUModelInfo *orig)
>      return NULL;
>  }
>  

2 blank lines.

> +int
> +qemuMonitorGetCPUModelBaseline(qemuMonitorPtr mon,
> +                               qemuMonitorCPUModelInfoPtr model_a,
> +                               qemuMonitorCPUModelInfoPtr model_b,
> +                               qemuMonitorCPUModelInfoPtr *model_baseline)
> +{
> +    VIR_DEBUG("model_a->name=%s", model_a->name);
> +    VIR_DEBUG("model_b->name=%s", model_b->name);
> +
> +    QEMU_CHECK_MONITOR_JSON(mon);
> +
> +    return qemuMonitorJSONGetCPUModelBaseline(mon, model_a, model_b, model_baseline);
> +}

No consumer for this yet - are there plans?  Just remember that for the
consumer we'll probably need some sort of qemu capability to manage
whether or not the command "query-cpu-model-baseline" exists for the
particular version or not.

>  
>  int
>  qemuMonitorGetCommands(qemuMonitorPtr mon,
> diff --git a/src/qemu/qemu_monitor.h b/src/qemu/qemu_monitor.h
> index d04148e56..c7a80ca63 100644
> --- a/src/qemu/qemu_monitor.h
> +++ b/src/qemu/qemu_monitor.h
> @@ -1079,6 +1079,11 @@ void qemuMonitorCPUModelInfoFree(qemuMonitorCPUModelInfoPtr model_info);
>  qemuMonitorCPUModelInfoPtr
>  qemuMonitorCPUModelInfoCopy(const qemuMonitorCPUModelInfo *orig);
>  
> +int qemuMonitorGetCPUModelBaseline(qemuMonitorPtr mon,
> +                                   qemuMonitorCPUModelInfoPtr model_a,
> +                                   qemuMonitorCPUModelInfoPtr model_b,
> +                                   qemuMonitorCPUModelInfoPtr *model_baseline);
> +
>  int qemuMonitorGetCommands(qemuMonitorPtr mon,
>                             char ***commands);
>  int qemuMonitorGetEvents(qemuMonitorPtr mon,
> diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c
> index 44c1b2f15..8cb10268f 100644
> --- a/src/qemu/qemu_monitor_json.c
> +++ b/src/qemu/qemu_monitor_json.c
> @@ -5539,6 +5539,63 @@ qemuMonitorJSONGetCPUModelExpansion(qemuMonitorPtr mon,
>      return ret;
>  }
>  
> +int
> +qemuMonitorJSONGetCPUModelBaseline(qemuMonitorPtr mon,
> +                                   qemuMonitorCPUModelInfoPtr model_a,
> +                                   qemuMonitorCPUModelInfoPtr model_b,
> +                                   qemuMonitorCPUModelInfoPtr *model_baseline)
> +{
> +    int ret = -1;
> +    virJSONValuePtr cmd = NULL;
> +    virJSONValuePtr reply = NULL;
> +    virJSONValuePtr data = NULL;
> +    virJSONValuePtr modela = NULL;
> +    virJSONValuePtr modelb = NULL;
> +
> +    *model_baseline = NULL;
> +
> +    if (!(modela = qemuMonitorJSONBuildCPUModelInfoToJSON(model_a)))
> +        goto cleanup;
> +
> +    if (!(modelb = qemuMonitorJSONBuildCPUModelInfoToJSON(model_b)))
> +        goto cleanup;
> +
> +    if (!(cmd = qemuMonitorJSONMakeCommand("query-cpu-model-baseline",
> +                                           "a:modela", &modela,
> +                                           "a:modelb", &modelb,
> +                                           NULL)))
> +        goto cleanup;
> +
> +    if (qemuMonitorJSONCommand(mon, cmd, &reply) < 0)
> +        goto cleanup;
> +
> +    /* Urgh, some QEMU architectures have query-cpu-model-baseline
> +     * command but return 'GenericError' with string "Not supported",
> +     * instead of simply omitting the command entirely
> +     */
> +    if (qemuMonitorJSONHasError(reply, "GenericError")) {
> +        ret = 0;

So this won't be an error then?

Or is this because you're calling without checking whether or not the
capability exists in the target emulator?

> +        goto cleanup;
> +    }
> +
> +    if (qemuMonitorJSONCheckReply(cmd, reply, VIR_JSON_TYPE_OBJECT) < 0)
> +        goto cleanup;
> +
> +    data = virJSONValueObjectGetObject(reply, "return");

Here's where I'd add the :

    if (!(cpu_model = virJSONValueObjectGetObject(data, "model"))) {
        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                       _("query-cpu-model-baseline reply data was
missing 'model'"));
        goto cleanup;
    }

> +
> +    if (!(*model_baseline = qemuMonitorJSONBuildCPUModelInfoFromJSON(data)))
> +        goto cleanup;

and pass the cpu_model here


John

> +
> +    ret = 0;
> +
> + cleanup:
> +    virJSONValueFree(cmd);
> +    virJSONValueFree(reply);
> +    virJSONValueFree(modela);
> +    virJSONValueFree(modelb);> +
> +    return ret;
> +}
>  
>  int qemuMonitorJSONGetCommands(qemuMonitorPtr mon,
>                                 char ***commands)
> diff --git a/src/qemu/qemu_monitor_json.h b/src/qemu/qemu_monitor_json.h
> index 045df4919..aa6f3582e 100644
> --- a/src/qemu/qemu_monitor_json.h
> +++ b/src/qemu/qemu_monitor_json.h
> @@ -361,6 +361,13 @@ int qemuMonitorJSONGetCPUModelExpansion(qemuMonitorPtr mon,
>                                          qemuMonitorCPUModelInfoPtr *model_info)
>      ATTRIBUTE_NONNULL(3) ATTRIBUTE_NONNULL(5);
>  
> +int qemuMonitorJSONGetCPUModelBaseline(qemuMonitorPtr mon,
> +                                       qemuMonitorCPUModelInfoPtr model_a,
> +                                       qemuMonitorCPUModelInfoPtr model_b,
> +                                       qemuMonitorCPUModelInfoPtr *model_baseline)
> +    ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3) ATTRIBUTE_NONNULL(4);
> +
> +
>  int qemuMonitorJSONGetCommands(qemuMonitorPtr mon,
>                                 char ***commands)
>      ATTRIBUTE_NONNULL(2);
> 

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