[RFC PATCH 2/6] machine: Perform zero-check for the computed value of sockets

[Yanan Wang <wangyanan55@huawei.com>]

We currently perform zero-check (default the value to 1 if zeroed)
for the computed values of cores/threads, to make sure they are at
least 1. For consistency, we probably should also default sockets
to 1 if the computed value is zero. Note that this won't affect
any existing working cmdlines but will improve the error reporting
of the invalid ones such as "-smp 8,maxcpus=9,cores=10,threads=1".

Signed-off-by: Yanan Wang <wangyanan55@huawei.com>
---
 hw/core/machine.c | 1 +
 hw/i386/pc.c      | 1 +
 2 files changed, 2 insertions(+)

diff --git a/hw/core/machine.c b/hw/core/machine.c
index f17bbe3275..1e194677cd 100644
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -761,6 +761,7 @@ static void smp_parse(MachineState *ms, SMPConfiguration *config, Error **errp)
         } else {
             maxcpus = maxcpus > 0 ? maxcpus : cpus;
             sockets = maxcpus / (cores * threads);
+            sockets = sockets > 0 ? sockets : 1;
         }
     } else if (cores == 0) {
         threads = threads > 0 ? threads : 1;
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index a9b22fdc01..a44511c937 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -729,6 +729,7 @@ static void pc_smp_parse(MachineState *ms, SMPConfiguration *config, Error **err
         } else {
             maxcpus = maxcpus > 0 ? maxcpus : cpus;
             sockets = maxcpus / (dies * cores * threads);
+            sockets = sockets > 0 ? sockets : 1;
         }
     } else if (cores == 0) {
         threads = threads > 0 ? threads : 1;
-- 
2.19.1