Re: [libvirt] [PULL 03/45] vl:c: make sure that sockets are calculated correctly in '-smp X' case

From: Igor Mammedov <imammedo(a)redhat.com&gt; commit (5cdc9b76e3 vl.c: Remove dead assignment) removed sockets calculation when 'sockets' weren't provided on CLI since there wasn't any users for it back then. Exiting checks are neither reachable } else if (sockets * cores * threads < cpus) { or nor triggerable if (sockets * cores * threads > max_cpus) so we weren't noticing wrong topology since then, since users recalculate sockets adhoc on their own. However with deprecation check it becomes noticable, for example -smp 2 will start printing warning: "warning: Invalid CPU topology deprecated: sockets (1) * cores (1) * threads (1) != maxcpus (2)" calculating sockets if they weren't specified. Fix it by returning back sockets calculation if it's omitted on CLI. Signed-off-by: Igor Mammedov <imammedo(a)redhat.com&gt; Reviewed-by: Andrew Jones <drjones(a)redhat.com&gt; Message-Id: <1536836762-273036-3-git-send-email-imammedo(a)redhat.com&gt; Signed-off-by: Eduardo Habkost <ehabkost(a)redhat.com&gt;

--- vl.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/vl.c b/vl.c index 027d04c7ca..2324321d91 100644 --- a/vl.c +++ b/vl.c @@ -1199,11 +1199,14 @@ static void smp_parse(QemuOpts *opts) /* compute missing values, prefer sockets over cores over threads */ if (cpus == 0 || sockets == 0) { - sockets = sockets > 0 ? sockets : 1; cores = cores > 0 ? cores : 1; threads = threads > 0 ? threads : 1; if (cpus == 0) { + sockets = sockets > 0 ? sockets : 1; cpus = cores * threads * sockets; + } else { + max_cpus = qemu_opt_get_number(opts, "maxcpus", cpus); + sockets = max_cpus / (cores * threads); } } else if (cores == 0) { threads = threads > 0 ? threads : 1;