[6/8] i386/cpu: Update cache topology with machine's configuration

Commit Message

Zhao Liu July 4, 2024, 3:16 a.m. UTC

User will configure smp cache topology via smp-cache object.

For this case, update the x86 CPUs' cache topology with user's
configuration in MachineState.

Signed-off-by: Zhao Liu <[e-mail]>
---
Changes since RFC v2:
 * Used smp_cache array to override cache topology.
 * Wrapped the updating into a function.
---
 target/i386/cpu.c | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

Patch

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 0ddbfa577caf..403a089111ca 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -7568,6 +7568,38 @@  static void x86_cpu_hyperv_realize(X86CPU *cpu)
     cpu->hyperv_limits[2] = 0;
 }
 
+#ifndef CONFIG_USER_ONLY
+static void x86_cpu_update_smp_cache_topo(MachineState *ms, X86CPU *cpu)
+{
+    CPUX86State *env = &cpu->env;
+    CpuTopologyLevel level;
+
+    level = machine_get_cache_topo_level(ms, SMP_CACHE_L1D);
+    if (level != CPU_TOPO_LEVEL_DEFAULT) {
+        env->cache_info_cpuid4.l1d_cache->share_level = level;
+        env->cache_info_amd.l1d_cache->share_level = level;
+    }
+
+    level = machine_get_cache_topo_level(ms, SMP_CACHE_L1I);
+    if (level != CPU_TOPO_LEVEL_DEFAULT) {
+        env->cache_info_cpuid4.l1i_cache->share_level = level;
+        env->cache_info_amd.l1i_cache->share_level = level;
+    }
+
+    level = machine_get_cache_topo_level(ms, SMP_CACHE_L2);
+    if (level != CPU_TOPO_LEVEL_DEFAULT) {
+        env->cache_info_cpuid4.l2_cache->share_level = level;
+        env->cache_info_amd.l2_cache->share_level = level;
+    }
+
+    level = machine_get_cache_topo_level(ms, SMP_CACHE_L3);
+    if (level != CPU_TOPO_LEVEL_DEFAULT) {
+        env->cache_info_cpuid4.l3_cache->share_level = level;
+        env->cache_info_amd.l3_cache->share_level = level;
+    }
+}
+#endif
+
 static void x86_cpu_realizefn(DeviceState *dev, Error **errp)
 {
     CPUState *cs = CPU(dev);
@@ -7792,6 +7824,11 @@  static void x86_cpu_realizefn(DeviceState *dev, Error **errp)
 
 #ifndef CONFIG_USER_ONLY
     MachineState *ms = MACHINE(qdev_get_machine());
+
+    if (ms->smp_cache) {
+        x86_cpu_update_smp_cache_topo(ms, cpu);
+    }
+
     qemu_register_reset(x86_cpu_machine_reset_cb, cpu);
 
     if (cpu->env.features[FEAT_1_EDX] & CPUID_APIC || ms->smp.cpus > 1) {