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 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 a multi-dies guest and 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 Guest system could discover multi-die/package topology through CPUID.1F. and its benefit is primarily for _reporting_ of the (virtual) CPU topology. The guest kernel with multi-die/package support have no impact on its cache topology, NUMA topology, Linux scheduler, or system performance. ==changelog== v3: - add a MachineClass::smp_parse function pointer - place the PC-specific function inside hw/i386/pc.c - introduce die_id in a separate patch with default value 0 - set env->nr_dies in pc_new_cpu() and pc_cpu_pre_plug() - fix a circular dependency between target/i386/cpu.c and hw/i386/pc.c - fix cpu->die_id check in pc_cpu_pre_plug() - Based on "[PATCH v3 00/10] Refactor cpu topo into machine properties" - Rebase to commit 219dca61ebf41625831d4f96a720852baf44b762 v2: https://patchwork.kernel.org/cover/10953191/ - 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 (9): i386: Add die-level cpu topology to x86CPU on PCMachine hw/i386: Adjust nr_dies with configured smp_dies for PCMachine i386/cpu: Consolidate die-id validity in smp context i386: Update new x86_apicid parsing rules with die_offset support tests/x86-cpuid: Update testcases in test_topo_bits() with multiple dies i386/cpu: Add CPUID.1F generation support for multi-dies PCMachine target/i386: Support multi-dies when host doesn't support CPUID.1F machine: Refactor smp_parse() in vl.c as MachineClass::smp_parse() vl.c: Add -smp, dies=* command line support and update doc hmp.c | 3 + hw/core/machine.c | 89 ++++++++++++++++++++++ hw/i386/pc.c | 148 ++++++++++++++++++++++++++++++++----- include/hw/boards.h | 5 ++ include/hw/i386/pc.h | 3 + include/hw/i386/topology.h | 76 +++++++++++++------ qapi/misc.json | 6 +- qemu-options.hx | 17 +++-- target/i386/cpu.c | 53 +++++++++++-- target/i386/cpu.h | 7 ++ target/i386/kvm.c | 36 ++++++++- tests/test-x86-cpuid.c | 84 +++++++++++---------- vl.c | 78 ++----------------- 13 files changed, 438 insertions(+), 167 deletions(-) -- 2.21.0
