[PATCH v1] qemu: monitor: substitute missing model name for host-passthrough

[Peter Krempa]

On Thu, Jun 25, 2020 at 17:58:46 -0400, Collin Walling wrote:
> When executing the hypervisor-cpu-compare/baseline commands and
> the XML file contains a CPU definition using host-passthrough
> and no model name, the commands will fail and return an error
> message from the QMP response.

This kind of logic does not seem to belong ...

> Let's fix this by checking for host-passthrough and a missing
> model name when converting a CPU definition to a JSON object.
> If these conditions are matched, then the JSON object will be
> constructed using "host" as the model name.
> 
> Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1850680
> 
> Signed-off-by: Collin Walling <walling at linux.ibm.com>
> ---
>  src/qemu/qemu_monitor_json.c | 13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)
> 
> diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c
> index 3070c1e6b3..448a3a9356 100644
> --- a/src/qemu/qemu_monitor_json.c
> +++ b/src/qemu/qemu_monitor_json.c
> @@ -5804,9 +5804,20 @@ qemuMonitorJSONMakeCPUModel(virCPUDefPtr cpu,
>  {
>      virJSONValuePtr model = virJSONValueNewObject();
>      virJSONValuePtr props = NULL;
> +    const char *model_name = cpu->model;
>      size_t i;
>  
> -    if (virJSONValueObjectAppendString(model, "name", cpu->model) < 0)
> +    if (!model_name) {
> +        if (cpu->mode == VIR_CPU_MODE_HOST_PASSTHROUGH) {
> +            model_name = "host";
> +        } else {
> +            virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
> +                           _("cpu parameter is missing a model name"));
> +            goto error;
> +        }
> +    }

... to the monitor code, where we try to just deal with the monitor
itself rather than hiding any logic.

But the final word needs to be from Jirka, but he is on holidays until
the end of next week.


> +
> +    if (virJSONValueObjectAppendString(model, "name", model_name) < 0)
>          goto error;
>  
>      if (cpu->nfeatures || !migratable) {
> -- 
> 2.26.2
>