QEMU tries to change the "threads" option even if it was explicitly set
in the command-line, and it shouldn't do that.
The right thing to do when all options (cpus, sockets, cores, threds)
are explicitly set is to sanity check them and abort in case they don't
make sense (i.e. when sockets*cores*threads < cpus).
Signed-off-by: Eduardo Habkost <ehabk...@redhat.com>
Reviewed-by: Andrew Jones <drjo...@redhat.com>
---
vl.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/vl.c b/vl.c
index cc4c535..8ac38df 100644
--- a/vl.c
+++ b/vl.c
@@ -1303,8 +1303,14 @@ static void smp_parse(QemuOpts *opts)
} else if (cores == 0) {
threads = threads > 0 ? threads : 1;
cores = cpus / (sockets * threads);
- } else {
+ } else if (threads == 0) {
threads = cpus / (cores * sockets);
+ } else if (sockets * cores * threads < cpus) {
+ fprintf(stderr, "cpu topology: error: "
+ "sockets (%u) * cores (%u) * threads (%u) < "
+ "smp_cpus (%u)\n",
+ sockets, cores, threads, cpus);
+ exit(1);
}
max_cpus = qemu_opt_get_number(opts, "maxcpus", 0);
--
1.9.3
