hostmem: set default prealloc_threads to valid value
Commit 4ebc74dbbf removed default prealloc_threads initialization
by mistake, and that makes QEMU crash with division on zero at
numpages_per_thread = numpages / memset_num_threads;
when QEMU is started with following backend
-object memory-backend-ram,id=ram-node0,prealloc=yes,size=128M
Return back initialization removed by 4ebc74dbbf to fix issue.
Fixes: 4ebc74dbbf7ad50e4101629f3f5da5fdc1544051
Reported-by: Raphael Norwitz <raphael.norwitz@nutanix.com>
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Message-Id: <20200325094423.24293-2-imammedo@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/backends/hostmem.c b/backends/hostmem.c
index a70867b..327f9ee 100644
--- a/backends/hostmem.c
+++ b/backends/hostmem.c
@@ -280,6 +280,7 @@
/* TODO: convert access to globals to compat properties */
backend->merge = machine_mem_merge(machine);
backend->dump = machine_dump_guest_core(machine);
+ backend->prealloc_threads = 1;
}
static void host_memory_backend_post_init(Object *obj)
