diff options
Diffstat (limited to 'numa.c')
| -rw-r--r-- | numa.c | 21 |
1 files changed, 20 insertions, 1 deletions
@@ -216,6 +216,7 @@ static void parse_numa_node(MachineState *ms, NumaNodeOptions *node, } numa_info[nodenr].present = true; max_numa_nodeid = MAX(max_numa_nodeid, nodenr + 1); + nb_numa_nodes++; } static void parse_numa_distance(NumaDistOptions *dist, Error **errp) @@ -282,7 +283,6 @@ static int parse_numa(void *opaque, QemuOpts *opts, Error **errp) if (err) { goto end; } - nb_numa_nodes++; break; case NUMA_OPTIONS_TYPE_DIST: parse_numa_distance(&object->u.dist, &err); @@ -433,6 +433,25 @@ void parse_numa_opts(MachineState *ms) exit(1); } + /* + * If memory hotplug is enabled (slots > 0) but without '-numa' + * options explicitly on CLI, guestes will break. + * + * Windows: won't enable memory hotplug without SRAT table at all + * + * Linux: if QEMU is started with initial memory all below 4Gb + * and no SRAT table present, guest kernel will use nommu DMA ops, + * which breaks 32bit hw drivers when memory is hotplugged and + * guest tries to use it with that drivers. + * + * Enable NUMA implicitly by adding a new NUMA node automatically. + */ + if (ms->ram_slots > 0 && nb_numa_nodes == 0 && + mc->auto_enable_numa_with_memhp) { + NumaNodeOptions node = { }; + parse_numa_node(ms, &node, NULL); + } + assert(max_numa_nodeid <= MAX_NODES); /* No support for sparse NUMA node IDs yet: */ |