As we know, die is a rectangular piece of a semiconductor wafer. It's very common that chip manufacturers put a multi-core die in one package and one die always has a one-to-one relationship with one socket. Inside the die, it cotains multi-cores and core contains threads topologically. We apply this socket/core/thread model to the qemu -smp configurable space and save it into APIC_IDs for identification.
The undercurrent Is surging. Multi-chip packaging technology allows for integration of multi-die devices in a single package, for example Intel CLX-AP or AMD EPYC. Integration can be enabled by high-performance, heterogeneous, multi-dies interconnect technology, providing a more cost-effective manner. QEMU and guests may take advantages of multi-dies host for such as guest placing or energy efficiency management... This patch series extend the CPU topology to the socket/dies/core/thread model, allowing the setting of dies number per one socket on -smp qemu command. For i386, it upgrades APIC_IDs generation and reversion functions with a new exposed leaf called CPUID.1F, which is a preferred superset to leaf 0BH. The CPUID.1F spec is on https://software.intel.com/en-us/articles/intel-sdm, 3-190 Vol 2A. E.g. we use -smp 4,dies=2,cores=2,threads=1 to run an MCP kvm-guest, check raw cpuid data and the expected output from guest is following: 0x0000001f 0x00: eax=0x00000000 ebx=0x00000001 ecx=0x00000100 edx=0x00000002 0x0000001f 0x01: eax=0x00000001 ebx=0x00000002 ecx=0x00000201 edx=0x00000001 0x0000001f 0x02: eax=0x00000002 ebx=0x00000004 ecx=0x00000502 edx=0x00000003 0x0000001f 0x03: eax=0x00000000 ebx=0x00000000 ecx=0x00000003 edx=0x00000001 Like Xu (5): cpu: introduce die, the new cpu toppolgy emulation level vl.c: add -smp,dies=* command line support i386: extend x86_apicid_* functions for smp_dies support i386: enable CPUID.1F leaf generation based on spec i386: add CPUID.1F to cpuid_data with host_cpuid check cpus.c | 1 + hmp.c | 3 ++ hw/core/machine.c | 12 +++++++ hw/i386/pc.c | 37 +++++++++++++++------- include/hw/i386/topology.h | 79 ++++++++++++++++++++++++++++++++++------------ include/qom/cpu.h | 1 + include/sysemu/cpus.h | 1 + qapi/misc.json | 1 + target/i386/cpu.c | 57 +++++++++++++++++++++++++++++---- target/i386/cpu.h | 5 +++ target/i386/kvm.c | 34 +++++++++++++++++++- target/i386/kvm_i386.h | 1 + vl.c | 33 +++++++++++-------- 13 files changed, 213 insertions(+), 52 deletions(-) -- 1.8.3.1
