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From 14e49ad3b98f01c1ad6fe456469d40a96a43dc3c Mon Sep 17 00:00:00 2001
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From: Gavin Shan <gshan@redhat.com>
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Date: Wed, 11 May 2022 18:01:35 +0800
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Subject: [PATCH 05/16] hw/arm/virt: Fix CPU's default NUMA node ID
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RH-Author: Gavin Shan <gshan@redhat.com>
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RH-MergeRequest: 86: hw/arm/virt: Fix the default CPU topology
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RH-Commit: [5/6] 5336f62bc0c53c0417db1d71ef89544907bc28c0 (gwshan/qemu-rhel-9)
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RH-Bugzilla: 2041823
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RH-Acked-by: Eric Auger <eric.auger@redhat.com>
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RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
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RH-Acked-by: Andrew Jones <drjones@redhat.com>
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2041823
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When CPU-to-NUMA association isn't explicitly provided by users,
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the default one is given by mc->get_default_cpu_node_id(). However,
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the CPU topology isn't fully considered in the default association
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and this causes CPU topology broken warnings on booting Linux guest.
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For example, the following warning messages are observed when the
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Linux guest is booted with the following command lines.
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/home/gavin/sandbox/qemu.main/build/qemu-system-aarch64 \
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-accel kvm -machine virt,gic-version=host \
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-cpu host \
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-smp 6,sockets=2,cores=3,threads=1 \
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-m 1024M,slots=16,maxmem=64G \
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-object memory-backend-ram,id=mem0,size=128M \
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-object memory-backend-ram,id=mem1,size=128M \
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-object memory-backend-ram,id=mem2,size=128M \
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-object memory-backend-ram,id=mem3,size=128M \
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-object memory-backend-ram,id=mem4,size=128M \
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-object memory-backend-ram,id=mem4,size=384M \
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-numa node,nodeid=0,memdev=mem0 \
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-numa node,nodeid=1,memdev=mem1 \
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-numa node,nodeid=2,memdev=mem2 \
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-numa node,nodeid=3,memdev=mem3 \
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-numa node,nodeid=4,memdev=mem4 \
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-numa node,nodeid=5,memdev=mem5
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:
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alternatives: patching kernel code
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BUG: arch topology borken
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the CLS domain not a subset of the MC domain
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<the above error log repeats>
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BUG: arch topology borken
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the DIE domain not a subset of the NODE domain
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With current implementation of mc->get_default_cpu_node_id(),
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CPU#0 to CPU#5 are associated with NODE#0 to NODE#5 separately.
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That's incorrect because CPU#0/1/2 should be associated with same
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NUMA node because they're seated in same socket.
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This fixes the issue by considering the socket ID when the default
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CPU-to-NUMA association is provided in virt_possible_cpu_arch_ids().
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With this applied, no more CPU topology broken warnings are seen
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from the Linux guest. The 6 CPUs are associated with NODE#0/1, but
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there are no CPUs associated with NODE#2/3/4/5.
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Signed-off-by: Gavin Shan <gshan@redhat.com>
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Reviewed-by: Igor Mammedov <imammedo@redhat.com>
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Reviewed-by: Yanan Wang <wangyanan55@huawei.com>
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Message-id: 20220503140304.855514-6-gshan@redhat.com
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Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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(cherry picked from commit 4c18bc192386dfbca530e7f550e0992df657818a)
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Signed-off-by: Gavin Shan <gshan@redhat.com>
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---
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hw/arm/virt.c | 4 +++-
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1 file changed, 3 insertions(+), 1 deletion(-)
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diff --git a/hw/arm/virt.c b/hw/arm/virt.c
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index a87c8d396a..95d012d6eb 100644
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--- a/hw/arm/virt.c
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+++ b/hw/arm/virt.c
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@@ -2545,7 +2545,9 @@ virt_cpu_index_to_props(MachineState *ms, unsigned cpu_index)
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static int64_t virt_get_default_cpu_node_id(const MachineState *ms, int idx)
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{
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- return idx % ms->numa_state->num_nodes;
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+ int64_t socket_id = ms->possible_cpus->cpus[idx].props.socket_id;
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+
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+ return socket_id % ms->numa_state->num_nodes;
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}
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static const CPUArchIdList *virt_possible_cpu_arch_ids(MachineState *ms)
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--
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2.31.1
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