Re: [PATCH 2/2] numa: prevent usage of -M memory-backend and -numa memdev at the same time

[Paolo Bonzini <pbonzini@redhat.com>]

On 11/05/20 16:11, Igor Mammedov wrote:
> Options -M memory-backend and -numa memdev are mutually exclusive,
> and if used together, it might lead to a crash in the worst case.
> For example when the same backend is used with these options together:
>   -m 4G \
>   -object memory-backend-ram,id=mem0,size=4G \
>   -M pc,memory-backend=mem0 \
>   -numa node,memdev=mem0
> QEMU will abort with:
>    exec.c:2006: qemu_ram_set_idstr: Assertion `!new_block->idstr[0]' failed.
> 
> and following backtrace:
>     abort ()
>     qemu_ram_set_idstr ()
>     vmstate_register_ram ()
>     vmstate_register_ram_global ()
>     machine_consume_memdev ()
>     numa_init_memdev_container ()
>     numa_complete_configuration ()
>     machine_run_board_init ()
> 
> add a check to error out in case the user tries to use both options at
> the same time.
> 
> Signed-off-by: Igor Mammedov <imammedo@redhat.com>
> ---
>  hw/core/numa.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/hw/core/numa.c b/hw/core/numa.c
> index 316bc50d75..5f81900f88 100644
> --- a/hw/core/numa.c
> +++ b/hw/core/numa.c
> @@ -757,6 +757,11 @@ void numa_complete_configuration(MachineState *ms)
>          }
>  
>          if (!numa_uses_legacy_mem() && mc->default_ram_id) {
> +            if (ms->ram_memdev_id) {
> +                error_report("'-machine memory-backend' and '-numa memdev'"
> +                             " properties are mutually exclusive");
> +                exit(1);
> +            }
>              ms->ram = g_new(MemoryRegion, 1);
>              memory_region_init(ms->ram, OBJECT(ms), mc->default_ram_id,
>                                 ram_size);
> 

Queued, thanks.

Paolo