diff mbox series

[v8,12/21] i386: Introduce module level cpu topology to CPUX86State

Message ID 20240131101350.109512-13-zhao1.liu@linux.intel.com (mailing list archive)
State New, archived
Headers show
Series Introduce smp.modules for x86 in QEMU | expand

Commit Message

Zhao Liu Jan. 31, 2024, 10:13 a.m. UTC 
From: Zhao Liu <zhao1.liu@intel.com>

Intel CPUs implement module level on hybrid client products (e.g.,
ADL-N, MTL, etc) and E-core server products.

A module contains a set of cores that share certain resources (in
current products, the resource usually includes L2 cache, as well as
module scoped features and MSRs).

Module level support is the prerequisite for L2 cache topology on
module level. With module level, we can implement the Guest's CPU
topology and future cache topology to be consistent with the Host's on
Intel hybrid client/E-core server platforms.

Tested-by: Yongwei Ma <yongwei.ma@intel.com>
Co-developed-by: Zhuocheng Ding <zhuocheng.ding@intel.com>
Signed-off-by: Zhuocheng Ding <zhuocheng.ding@intel.com>
Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
---
Changes since v7:
 * Mapped x86 module to smp module instead of cluster.
 * Re-wrote the commit message to explain the reason why we needs module
   level.
 * Dropped Michael/Babu's ACKed/Tested tags since the code change.
 * Re-added Yongwei's Tested tag For his re-testing.

Changes since v1:
 * The background of the introduction of the "cluster" parameter and its
   exact meaning were revised according to Yanan's explanation. (Yanan)
---
 hw/i386/x86.c     | 5 +++++
 target/i386/cpu.c | 1 +
 target/i386/cpu.h | 3 +++
 3 files changed, 9 insertions(+)
diff mbox series

Patch

diff --git a/hw/i386/x86.c b/hw/i386/x86.c
index 5a42e3757099..2ead995b0197 100644
--- a/hw/i386/x86.c
+++ b/hw/i386/x86.c
@@ -309,6 +309,11 @@  void x86_cpu_pre_plug(HotplugHandler *hotplug_dev,
 
     init_topo_info(&topo_info, x86ms);
 
+    if (ms->smp.modules > 1) {
+        env->nr_modules = ms->smp.modules;
+        /* TODO: Expose module level in CPUID[0x1F]. */
+    }
+
     if (ms->smp.dies > 1) {
         env->nr_dies = ms->smp.dies;
         set_bit(CPU_TOPO_LEVEL_DIE, env->avail_cpu_topo);
diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 81d2f0c42a0c..f1a0aa77a873 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -7700,6 +7700,7 @@  static void x86_cpu_init_default_topo(X86CPU *cpu)
 {
     CPUX86State *env = &cpu->env;
 
+    env->nr_modules = 1;
     env->nr_dies = 1;
 
     /* SMT, core and package levels are set by default. */
diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index 8a7450f265a1..d0951a0fec27 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -1892,6 +1892,9 @@  typedef struct CPUArchState {
     /* Number of dies within this CPU package. */
     unsigned nr_dies;
 
+    /* Number of modules within this CPU package. */
+    unsigned nr_modules;
+
     /* Bitmap of available CPU topology levels for this CPU. */
     DECLARE_BITMAP(avail_cpu_topo, CPU_TOPO_LEVEL_MAX);
 } CPUX86State;