Re: [Qemu-devel] [PATCH] smbios: Fix assertion on socket count calculation

[Igor Mammedov <imammedo@redhat.com>]

On Mon, 29 Sep 2014 22:21:45 -0300
Eduardo Habkost <ehabkost@redhat.com> wrote:

> QEMU currently allows the number of VCPUs to not be a multiple of the
> number of threads per socket, but the smbios socket count calculation
> introduced by commit c97294ec1b9e36887e119589d456557d72ab37b5 doesn't
> take that into account, triggering an assertion. e.g.:
> 
>   $ ./x86_64-softmmu/qemu-system-x86_64 -smp 4,sockets=2,cores=6,threads=1
>   qemu-system-x86_64: /home/ehabkost/rh/proj/virt/qemu/hw/i386/smbios.c:825: smbios_get_tables: Assertion `smbios_smp_sockets >= 1' failed.
>   Aborted (core dumped)
>
> Socket count calculation doesn't belong to smbios.c and should
> eventually be moved to the main SMP topology configuration code. But
> while we don't move the code, at least make it correct by rounding up
> the division.
> 
> Cc: Gabriel Somlo <somlo@cmu.edu>
> Cc: qemu-stable@nongnu.org
> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
> ---
>  hw/i386/smbios.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/hw/i386/smbios.c b/hw/i386/smbios.c
> index e3fa1b2..0ae5960 100644
> --- a/hw/i386/smbios.c
> +++ b/hw/i386/smbios.c
> @@ -821,7 +821,7 @@ void smbios_get_tables(uint8_t **tables, size_t *tables_len,
>          smbios_build_type_2_table();
>          smbios_build_type_3_table();
>  
> -        smbios_smp_sockets = smp_cpus / (smp_cores * smp_threads);
> +        smbios_smp_sockets = DIV_ROUND_UP(smp_cpus, smp_cores * smp_threads);
>          assert(smbios_smp_sockets >= 1);
>  
>          for (i = 0; i < smbios_smp_sockets; i++) {

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