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i386/cpu: Introduce bitmap to cache available CPU topology levels

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Currently, QEMU checks the specify number of topology domains to detect
if there's extended topology levels (e.g., checking nr_dies).

With this bitmap, the extended CPU topology (the levels other than SMT,
core and package) could be easier to detect without touching the
topology details.

This is also in preparation for the follow-up to decouple CPUID[0x1F]
subleaf with specific topology level.

Tested-by: Yongwei Ma <yongwei.ma@intel.com>
Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Message-ID: <20240424154929.1487382-10-zhao1.liu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Zhao Liu 2024-04-24 23:49:17 +08:00 • committed by Paolo Bonzini
parent 2613747a79
commit 6ddeb0ec8c
5 changed files with 48 additions and 5 deletions
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5
hw/i386/x86-common.c
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@ -271,7 +271,10 @@ void x86_cpu_pre_plug(HotplugHandler *hotplug_dev,
init_topo_info(&topo_info, x86ms);
env->nr_dies = ms->smp.dies;
if (ms->smp.dies > 1) {
env->nr_dies = ms->smp.dies;
set_bit(CPU_TOPO_LEVEL_DIE, env->avail_cpu_topo);
}
/*
* If APIC ID is not set,