Re: [PATCH for-6.2 v3 01/11] machine: Minor refactor/cleanup for the smp parsers

[Andrew Jones <drjones@redhat.com>]

On Wed, Jul 28, 2021 at 11:48:38AM +0800, Yanan Wang wrote:
> To pave the way for the functional improvement in later patches,
> make some refactor/cleanup for the smp parsers, including using
> local maxcpus instead of ms->smp.max_cpus in the calculation,
> defaulting dies to 0 initially like other members, cleanup the
> sanity check for dies.
> 
> No functional change intended.
> 
> Signed-off-by: Yanan Wang <wangyanan55@huawei.com>
> ---
>  hw/core/machine.c | 19 +++++++++++--------
>  hw/i386/pc.c      | 23 ++++++++++++++---------
>  2 files changed, 25 insertions(+), 17 deletions(-)
> 
> diff --git a/hw/core/machine.c b/hw/core/machine.c
> index e1533dfc47..ffc0629854 100644
> --- a/hw/core/machine.c
> +++ b/hw/core/machine.c
> @@ -747,9 +747,11 @@ static void smp_parse(MachineState *ms, SMPConfiguration *config, Error **errp)
>      unsigned sockets = config->has_sockets ? config->sockets : 0;
>      unsigned cores   = config->has_cores ? config->cores : 0;
>      unsigned threads = config->has_threads ? config->threads : 0;
> +    unsigned maxcpus = config->has_maxcpus ? config->maxcpus : 0;
>  
> -    if (config->has_dies && config->dies != 0 && config->dies != 1) {
> +    if (config->has_dies && config->dies > 1) {
>          error_setg(errp, "dies not supported by this machine's CPU topology");
> +        return;
>      }
>  
>      /* compute missing values, prefer sockets over cores over threads */
> @@ -760,8 +762,8 @@ static void smp_parse(MachineState *ms, SMPConfiguration *config, Error **errp)
>              sockets = sockets > 0 ? sockets : 1;
>              cpus = cores * threads * sockets;
>          } else {
> -            ms->smp.max_cpus = config->has_maxcpus ? config->maxcpus : cpus;
> -            sockets = ms->smp.max_cpus / (cores * threads);
> +            maxcpus = maxcpus > 0 ? maxcpus : cpus;
> +            sockets = maxcpus / (sockets * cores);

Should be divided by (cores * threads) like before.

Thanks,
drew