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bh=xr5+tqz/VRLGBJ9WLwFbA6SVF7nTObTe8XkY7VTqOC4=; b=R/B+F3jMQyh+wqBS3VxQMb/ihwykqlYfYlDCkEI0gpzp6TpMiUa8xOhbSmHNNk7/ennwbz puBChncl04QYvbr9zA+x5KIV6iIEq0+0AIrvLSKg92B/QhDXWUt1L3rexOS8HqoGfinh2E CzbwPd1kSxqWexH6KxGSMdRx6BZhhco= X-MC-Unique: kC0b_l9RNd-mWz86QrMDFQ-1 From: Gavin Shan To: qemu-devel@nongnu.org Cc: qemu-arm@nongnu.org, peter.maydell@linaro.org, yihyu@redhat.com, shan.gavin@gmail.com Subject: [PATCH] hw/arm/virt: Prevent CPUs in one socket to span mutiple NUMA nodes Date: Tue, 21 Feb 2023 16:53:52 +0800 Message-Id: <20230221085352.212938-1-gshan@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=gshan@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1676969682667100001 Content-Type: text/plain; charset="utf-8" Linux kernel guest reports warning when two CPUs in one socket have been associated with different NUMA nodes, using the following command lines. -smp 6,maxcpus=3D6,sockets=3D2,clusters=3D1,cores=3D3,threads=3D1 \ -numa node,nodeid=3D0,cpus=3D0-1,memdev=3Dram0 \ -numa node,nodeid=3D1,cpus=3D2-3,memdev=3Dram1 \ -numa node,nodeid=3D2,cpus=3D4-5,memdev=3Dram2 \ ------------[ cut here ]------------ WARNING: CPU: 0 PID: 1 at kernel/sched/topology.c:2271 build_sched_domain= s+0x284/0x910 Modules linked in: CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.14.0-268.el9.aarch64 #1 pstate: 00400005 (nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=3D--) pc : build_sched_domains+0x284/0x910 lr : build_sched_domains+0x184/0x910 sp : ffff80000804bd50 x29: ffff80000804bd50 x28: 0000000000000002 x27: 0000000000000000 x26: ffff800009cf9a80 x25: 0000000000000000 x24: ffff800009cbf840 x23: ffff000080325000 x22: ffff0000005df800 x21: ffff80000a4ce508 x20: 0000000000000000 x19: ffff000080324440 x18: 0000000000000014 x17: 00000000388925c0 x16: 000000005386a066 x15: 000000009c10cc2e x14: 00000000000001c0 x13: 0000000000000001 x12: ffff00007fffb1a0 x11: ffff00007fffb180 x10: ffff80000a4ce508 x9 : 0000000000000041 x8 : ffff80000a4ce500 x7 : ffff80000a4cf920 x6 : 0000000000000001 x5 : 0000000000000001 x4 : 0000000000000007 x3 : 0000000000000002 x2 : 0000000000001000 x1 : ffff80000a4cf928 x0 : 0000000000000001 Call trace: build_sched_domains+0x284/0x910 sched_init_domains+0xac/0xe0 sched_init_smp+0x48/0xc8 kernel_init_freeable+0x140/0x1ac kernel_init+0x28/0x140 ret_from_fork+0x10/0x20 Fix it by preventing mutiple CPUs in one socket to be associated with different NUMA nodes. Reported-by: Yihuang Yu Signed-off-by: Gavin Shan --- hw/arm/virt.c | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) diff --git a/hw/arm/virt.c b/hw/arm/virt.c index ac626b3bef..e0af267c77 100644 --- a/hw/arm/virt.c +++ b/hw/arm/virt.c @@ -230,6 +230,39 @@ static bool cpu_type_valid(const char *cpu) return false; } =20 +static bool numa_state_valid(MachineState *ms) +{ + MachineClass *mc =3D MACHINE_GET_CLASS(ms); + NumaState *state =3D ms->numa_state; + const CPUArchIdList *possible_cpus =3D mc->possible_cpu_arch_ids(ms); + const CPUArchId *cpus =3D possible_cpus->cpus; + int len =3D possible_cpus->len, i, j; + + if (!state || state->num_nodes <=3D 1 || len <=3D 1) { + return true; + } + + for (i =3D 0; i < len; i++) { + for (j =3D i + 1; j < len; j++) { + if (cpus[i].props.has_socket_id && + cpus[i].props.has_node_id && + cpus[j].props.has_socket_id && + cpus[j].props.has_node_id && + cpus[i].props.socket_id =3D=3D cpus[j].props.socket_id && + cpus[i].props.node_id !=3D cpus[j].props.node_id) { + error_report("CPU-%d and CPU-%d in socket-%ld have been " + "associated with node-%ld and node-%ld", + i, j, cpus[i].props.socket_id, + cpus[i].props.node_id, + cpus[j].props.node_id); + return false; + } + } + } + + return true; +} + static void create_randomness(MachineState *ms, const char *node) { struct { @@ -2040,6 +2073,10 @@ static void machvirt_init(MachineState *machine) exit(1); } =20 + if (!numa_state_valid(machine)) { + exit(1); + } + possible_cpus =3D mc->possible_cpu_arch_ids(machine); =20 /* --=20 2.23.0