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146 lines
6.0 KiB
146 lines
6.0 KiB
From 760a2f284f6d4cd3cd3b1685411bbca21c4ad233 Mon Sep 17 00:00:00 2001
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From: Gavin Shan <gshan@redhat.com>
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Date: Tue, 27 Jun 2023 20:20:09 +1000
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Subject: [PATCH 1/6] numa: Validate cluster and NUMA node boundary if required
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Gavin Shan <gshan@redhat.com>
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RH-MergeRequest: 175: hw/arm: Validate CPU cluster and NUMA node boundary for RHEL machines
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RH-Bugzilla: 2171363
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RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
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RH-Acked-by: Eric Auger <eric.auger@redhat.com>
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RH-Commit: [1/3] 24580064b9a0076ec4d9a916839d85135ac48cd9
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2171363
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For some architectures like ARM64, multiple CPUs in one cluster can be
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associated with different NUMA nodes, which is irregular configuration
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because we shouldn't have this in baremetal environment. The irregular
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configuration causes Linux guest to misbehave, as the following warning
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messages indicate.
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-smp 6,maxcpus=6,sockets=2,clusters=1,cores=3,threads=1 \
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-numa node,nodeid=0,cpus=0-1,memdev=ram0 \
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-numa node,nodeid=1,cpus=2-3,memdev=ram1 \
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-numa node,nodeid=2,cpus=4-5,memdev=ram2 \
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------------[ cut here ]------------
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WARNING: CPU: 0 PID: 1 at kernel/sched/topology.c:2271 build_sched_domains+0x284/0x910
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Modules linked in:
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CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.14.0-268.el9.aarch64 #1
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pstate: 00400005 (nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
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pc : build_sched_domains+0x284/0x910
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lr : build_sched_domains+0x184/0x910
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sp : ffff80000804bd50
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x29: ffff80000804bd50 x28: 0000000000000002 x27: 0000000000000000
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x26: ffff800009cf9a80 x25: 0000000000000000 x24: ffff800009cbf840
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x23: ffff000080325000 x22: ffff0000005df800 x21: ffff80000a4ce508
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x20: 0000000000000000 x19: ffff000080324440 x18: 0000000000000014
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x17: 00000000388925c0 x16: 000000005386a066 x15: 000000009c10cc2e
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x14: 00000000000001c0 x13: 0000000000000001 x12: ffff00007fffb1a0
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x11: ffff00007fffb180 x10: ffff80000a4ce508 x9 : 0000000000000041
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x8 : ffff80000a4ce500 x7 : ffff80000a4cf920 x6 : 0000000000000001
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x5 : 0000000000000001 x4 : 0000000000000007 x3 : 0000000000000002
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x2 : 0000000000001000 x1 : ffff80000a4cf928 x0 : 0000000000000001
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Call trace:
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build_sched_domains+0x284/0x910
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sched_init_domains+0xac/0xe0
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sched_init_smp+0x48/0xc8
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kernel_init_freeable+0x140/0x1ac
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kernel_init+0x28/0x140
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ret_from_fork+0x10/0x20
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Improve the situation to warn when multiple CPUs in one cluster have
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been associated with different NUMA nodes. However, one NUMA node is
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allowed to be associated with different clusters.
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Signed-off-by: Gavin Shan <gshan@redhat.com>
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Acked-by: Philippe Mathieu-Daudé <philmd@linaro.org>
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Acked-by: Igor Mammedov <imammedo@redhat.com>
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Message-Id: <20230509002739.18388-2-gshan@redhat.com>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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(cherry picked from commit a494fdb715832000ee9047a549a35aacfea8175e)
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Signed-off-by: Gavin Shan <gshan@redhat.com>
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---
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hw/core/machine.c | 42 ++++++++++++++++++++++++++++++++++++++++++
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include/hw/boards.h | 1 +
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2 files changed, 43 insertions(+)
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diff --git a/hw/core/machine.c b/hw/core/machine.c
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index c28702b690..5abdc8c39b 100644
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--- a/hw/core/machine.c
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+++ b/hw/core/machine.c
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@@ -1496,6 +1496,45 @@ static void machine_numa_finish_cpu_init(MachineState *machine)
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g_string_free(s, true);
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}
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+static void validate_cpu_cluster_to_numa_boundary(MachineState *ms)
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+{
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+ MachineClass *mc = MACHINE_GET_CLASS(ms);
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+ NumaState *state = ms->numa_state;
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+ const CPUArchIdList *possible_cpus = mc->possible_cpu_arch_ids(ms);
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+ const CPUArchId *cpus = possible_cpus->cpus;
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+ int i, j;
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+
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+ if (state->num_nodes <= 1 || possible_cpus->len <= 1) {
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+ return;
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+ }
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+
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+ /*
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+ * The Linux scheduling domain can't be parsed when the multiple CPUs
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+ * in one cluster have been associated with different NUMA nodes. However,
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+ * it's fine to associate one NUMA node with CPUs in different clusters.
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+ */
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+ for (i = 0; i < possible_cpus->len; i++) {
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+ for (j = i + 1; j < possible_cpus->len; j++) {
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+ if (cpus[i].props.has_socket_id &&
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+ cpus[i].props.has_cluster_id &&
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+ cpus[i].props.has_node_id &&
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+ cpus[j].props.has_socket_id &&
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+ cpus[j].props.has_cluster_id &&
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+ cpus[j].props.has_node_id &&
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+ cpus[i].props.socket_id == cpus[j].props.socket_id &&
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+ cpus[i].props.cluster_id == cpus[j].props.cluster_id &&
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+ cpus[i].props.node_id != cpus[j].props.node_id) {
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+ warn_report("CPU-%d and CPU-%d in socket-%" PRId64 "-cluster-%" PRId64
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+ " have been associated with node-%" PRId64 " and node-%" PRId64
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+ " respectively. It can cause OSes like Linux to"
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+ " misbehave", i, j, cpus[i].props.socket_id,
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+ cpus[i].props.cluster_id, cpus[i].props.node_id,
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+ cpus[j].props.node_id);
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+ }
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+ }
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+ }
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+}
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+
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MemoryRegion *machine_consume_memdev(MachineState *machine,
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HostMemoryBackend *backend)
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{
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@@ -1581,6 +1620,9 @@ void machine_run_board_init(MachineState *machine, const char *mem_path, Error *
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numa_complete_configuration(machine);
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if (machine->numa_state->num_nodes) {
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machine_numa_finish_cpu_init(machine);
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+ if (machine_class->cpu_cluster_has_numa_boundary) {
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+ validate_cpu_cluster_to_numa_boundary(machine);
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+ }
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}
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}
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diff --git a/include/hw/boards.h b/include/hw/boards.h
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index 5f08bd7550..3628671228 100644
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--- a/include/hw/boards.h
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+++ b/include/hw/boards.h
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@@ -275,6 +275,7 @@ struct MachineClass {
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bool nvdimm_supported;
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bool numa_mem_supported;
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bool auto_enable_numa;
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+ bool cpu_cluster_has_numa_boundary;
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SMPCompatProps smp_props;
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const char *default_ram_id;
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--
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2.39.3
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