Re: [PATCH 20/36] vl: separate qemu_resolve_machine_memdev

[Igor Mammedov <imammedo@redhat.com>]

On Mon, 23 Nov 2020 09:14:19 -0500
Paolo Bonzini <pbonzini@redhat.com> wrote:

> This is a bit nasty: the machine is storing a string and later
> resolving it.  We probably want to make the memdev property a
> normal link, and handle "-M memdev" as a legacy option that is
> special cased by machine_set_property.
> 
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Reviewed-by: Igor Mammedov <imammedo@redhat.com>

> ---
>  softmmu/vl.c | 70 +++++++++++++++++++++++++++-------------------------
>  1 file changed, 37 insertions(+), 33 deletions(-)
> 
> diff --git a/softmmu/vl.c b/softmmu/vl.c
> index 741a800114..6c8a103178 100644
> --- a/softmmu/vl.c
> +++ b/softmmu/vl.c
> @@ -2834,6 +2834,42 @@ static bool have_custom_ram_size(void)
>      return !!qemu_opt_get_size(opts, "size", 0);
>  }
>  
> +static void qemu_resolve_machine_memdev(void)
> +{
> +    if (current_machine->ram_memdev_id) {
> +        Object *backend;
> +        ram_addr_t backend_size;
> +
> +        backend = object_resolve_path_type(current_machine->ram_memdev_id,
> +                                           TYPE_MEMORY_BACKEND, NULL);
> +        if (!backend) {
> +            error_report("Memory backend '%s' not found",
> +                         current_machine->ram_memdev_id);
> +            exit(EXIT_FAILURE);
> +        }
> +        backend_size = object_property_get_uint(backend, "size",  &error_abort);
> +        if (have_custom_ram_size() && backend_size != ram_size) {
> +                error_report("Size specified by -m option must match size of "
> +                             "explicitly specified 'memory-backend' property");
> +                exit(EXIT_FAILURE);
> +        }
> +        if (mem_path) {
> +            error_report("'-mem-path' can't be used together with"
> +                         "'-machine memory-backend'");
> +            exit(EXIT_FAILURE);
> +        }
> +        ram_size = backend_size;
> +    }
> +
> +    if (!xen_enabled()) {
> +        /* On 32-bit hosts, QEMU is limited by virtual address space */
> +        if (ram_size > (2047 << 20) && HOST_LONG_BITS == 32) {
> +            error_report("at most 2047 MB RAM can be simulated");
> +            exit(1);
> +        }
> +    }
> +}
> +
>  static void set_memory_options(MachineClass *mc)
>  {
>      uint64_t sz;
> @@ -4467,39 +4503,7 @@ void qemu_init(int argc, char **argv, char **envp)
>          current_machine->cpu_type = parse_cpu_option(cpu_option);
>      }
>  
> -    if (current_machine->ram_memdev_id) {
> -        Object *backend;
> -        ram_addr_t backend_size;
> -
> -        backend = object_resolve_path_type(current_machine->ram_memdev_id,
> -                                           TYPE_MEMORY_BACKEND, NULL);
> -        if (!backend) {
> -            error_report("Memory backend '%s' not found",
> -                         current_machine->ram_memdev_id);
> -            exit(EXIT_FAILURE);
> -        }
> -        backend_size = object_property_get_uint(backend, "size",  &error_abort);
> -        if (have_custom_ram_size() && backend_size != ram_size) {
> -                error_report("Size specified by -m option must match size of "
> -                             "explicitly specified 'memory-backend' property");
> -                exit(EXIT_FAILURE);
> -        }
> -        if (mem_path) {
> -            error_report("'-mem-path' can't be used together with"
> -                         "'-machine memory-backend'");
> -            exit(EXIT_FAILURE);
> -        }
> -        ram_size = backend_size;
> -    }
> -
> -    if (!xen_enabled()) {
> -        /* On 32-bit hosts, QEMU is limited by virtual address space */
> -        if (ram_size > (2047 << 20) && HOST_LONG_BITS == 32) {
> -            error_report("at most 2047 MB RAM can be simulated");
> -            exit(1);
> -        }
> -    }
> -
> +    qemu_resolve_machine_memdev();
>      parse_numa_opts(current_machine);
>  
>      /* do monitor/qmp handling at preconfig state if requested */