Multi-chip packaging technology allows integration of multi-cores in one die and multi-dies in one single package, for example Intel CLX-AP or AMD EPYC.
This kind of 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 ==changelog== v2: - Enable cpu die-level topolgy only for PCMachine and X86CPU - Minimize cpuid.0.eax to the setting value actually used by guest - Update cmd line -smps docs for die-level configurations - Refactoring topo-bit tests for x86_apicid_from_cpu_idx() with nr_dies - Based on "[PATCH v3 00/10] Refactor cpu topo into machine properties" - Rebase to commit 2259637b95bef3116cc262459271de08e038cc66 v1: https://patchwork.kernel.org/cover/10876667/ Like Xu (5): target/i386: Add cpu die-level topology support for X86CPU i386/cpu: Consolidate die-id validity in smp context vl.c: Add -smp, dies=* command line support and update -smp doc i386/cpu: Update apicid parsing rules and topo-bit tests for dies target/i386: Add CPUID.1F generation support for multi-die PCMachine hmp.c | 3 ++ hw/core/machine.c | 12 +++++ hw/i386/pc.c | 52 +++++++++++++++++----- include/hw/i386/pc.h | 2 + include/hw/i386/topology.h | 76 +++++++++++++++++++++++--------- qapi/misc.json | 6 ++- qemu-options.hx | 17 ++++---- target/i386/cpu.c | 59 ++++++++++++++++++++++--- target/i386/cpu.h | 7 +++ target/i386/kvm.c | 30 ++++++++++++- tests/test-x86-cpuid.c | 84 ++++++++++++++++++----------------- vl.c | 89 +++++++++++++++++++++++++++++++++++++- 12 files changed, 347 insertions(+), 90 deletions(-) -- 2.21.0
