Re: [Qemu-arm] [PATCH v5 2/2] ACPI: Add -acpitable fadt= to allow FADT revision changes

[Zheng, Lv]

Hi, Paolo

> From: Paolo Bonzini [mailto:address@hidden
> Subject: Re: [PATCH v5 2/2] ACPI: Add -acpitable fadt= to allow FADT
> revision changes
> 
> 
> 
> On 11/08/2016 11:36, Lv Zheng wrote:
> >
> > -    error_setg(errp, "'-acpitable' requires one of 'data' or 'file'");
> > +    val = qemu_opt_get((QemuOpts *)opts, "fadt");
> > +    if (val) {
> > +        unsigned long rev;
> 
> Don't use qemu_opt_get.  Add the field to AcpiTableOptions in
> qapi-schema.json, and then use hdrs->has_fadt, hdrs->fadt.


1. If I do so, users may be confused when only -acpitable fadt=3 is
    specified (no user tables are provided), qemu may exit because of 
    "data or file option missing".
2. If we doesn't want qemu exit in the above case, code in
    acpi_table_add() will be too complicated.
3. If I put fadt into AcpiTableOptions in the schema,
    hdrs->has_fadt/hdrs->fadt will become 2 more useless options
    (just like hders->file/hdrs->data/hdrs->has_file/hdrs->has_data,
    see comments of acpi_table_install()) passed to acpi_table_install().

That's why I enhanced -acpitable to convert it into an option with 3
mandatory sub-options:
-acpitable data/file ....
-acpitable fadt ....

Thanks
Lv