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Set numa topology for max_cpus

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qemu-kvm passes numa/SRAT topology information for smp_cpus to SeaBIOS. However
SeaBIOS always expects to setup max_cpus number of SRAT cpu entries
(MaxCountCPUs variable in build_srat function of Seabios). When qemu-kvm runs
with smp_cpus != max_cpus (e.g. -smp 2,maxcpus=4), Seabios will mistakenly use
memory SRAT info for setting up CPU SRAT entries for the offline CPUs. Wrong
SRAT memory entries are also created. This breaks NUMA in a guest.
Fix by setting up SRAT info for max_cpus in qemu-kvm.

Signed-off-by: Vasilis Liaskovitis <vasilis.liaskovitis@profitbricks.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Vasilis Liaskovitis 2011-10-26 14:19:00 +02:00 committed by Marcelo Tosatti
parent cce47516cd
commit 991dfefdee
2 changed files with 5 additions and 5 deletions
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8
hw/pc.c
View file

@ -624,9 +624,9 @@ static void *bochs_bios_init(void)
* of nodes, one word for each VCPU->node and one word for each node to
* hold the amount of memory.
*/
numa_fw_cfg = g_malloc0((1 + smp_cpus + nb_numa_nodes) * 8);
numa_fw_cfg = g_malloc0((1 + max_cpus + nb_numa_nodes) * 8);
numa_fw_cfg[0] = cpu_to_le64(nb_numa_nodes);
for (i = 0; i < smp_cpus; i++) {
for (i = 0; i < max_cpus; i++) {
for (j = 0; j < nb_numa_nodes; j++) {
if (node_cpumask[j] & (1 << i)) {
numa_fw_cfg[i + 1] = cpu_to_le64(j);
@ -635,10 +635,10 @@ static void *bochs_bios_init(void)
}
}
for (i = 0; i < nb_numa_nodes; i++) {
numa_fw_cfg[smp_cpus + 1 + i] = cpu_to_le64(node_mem[i]);
numa_fw_cfg[max_cpus + 1 + i] = cpu_to_le64(node_mem[i]);
}
fw_cfg_add_bytes(fw_cfg, FW_CFG_NUMA, (uint8_t *)numa_fw_cfg,
(1 + smp_cpus + nb_numa_nodes) * 8);
(1 + max_cpus + nb_numa_nodes) * 8);
return fw_cfg;
}

2
vl.c
View file

@ -3305,7 +3305,7 @@ int main(int argc, char **argv, char **envp)
* real machines which also use this scheme.
*/
if (i == nb_numa_nodes) {
for (i = 0; i < smp_cpus; i++) {
for (i = 0; i < max_cpus; i++) {
node_cpumask[i % nb_numa_nodes] |= 1 << i;
}
}