From: Zhao Liu <zhao1.liu@intel.com>
For smp systems, the parts in one topology level are the same. But now
there are more and more systems with hybrid architectures. Different
parts of the same topology level may have differences. For example,
Intel's Alder Lake series CPU has two types of cores, so the CPU
topology is no longer symmetrical.
The hybrid topology is compatible with the smp topology type, that is,
different parts on the same level of the hybrid topology can set to be
the same, but the hybrid topology will introduce more complexity (need
to allocate more memory, organized with array or linked-list), so the
original smp topology support is retained while introducing the hybrid
topology, and the hybrid topology is only built when the hybrid is
explicitly required.
Therefore, we introduce the definition support of hybrid cpu topology
here. At the same time, in order to unify with the original smp, we
introduce a new cpu topology structure that can support smp topology
or hybrid topology. This structure will replace the CpuTopology type (in
include/hw/boards.h) used by MachineState.smp.
As for now, we only support two hybrid topology levels: core and
cluster.
Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
---
MAINTAINERS | 1 +
include/hw/cpu/cpu-topology.h | 117 ++++++++++++++++++++++++++++++++++
qapi/machine.json | 12 ++++
3 files changed, 130 insertions(+)
create mode 100644 include/hw/cpu/cpu-topology.h
diff --git a/MAINTAINERS b/MAINTAINERS
index 58794885ced3..918a9418d98e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1742,6 +1742,7 @@ F: qapi/machine-target.json
F: include/hw/boards.h
F: include/hw/core/cpu.h
F: include/hw/cpu/cluster.h
+F: include/hw/cpu/cpu-topology.h
F: include/sysemu/numa.h
F: tests/unit/test-smp-parse.c
T: git https://gitlab.com/ehabkost/qemu.git machine-next