[Qemu-devel] [PATCH for-2.8 00/18] pc: q35: x2APIC support in kvm_apic mode

[Igor Mammedov]

Changes since RFC:
  - use new KVM_CAP_X2APIC_API to detect x2APIC IDs support
  - rebase on top of 2.7-rc1, since many deps were merged
  - fix etc/boot-cpus to account for -device provided cpus
  - include not yet merged _PXM fix as prereq
  - add 2.8 machine type and bump up maxcpus count since it

Series extends current CPU/kvm_apic/generic pc machine
code to support x2APIC and upto 288 VCPUs when QEMU
is used with KVM's lapic.

Due to FW_CFG_MAX_CPUS (which is actually apic_id_limit)
being limited to uint16_t, the max possible APIC ID is
limitted to 2^16 with this series but that should
be sufficient for bumping VCPUs number for quite a while.

Tested with following CLI:
 QEMU -M q35 -enable-kvm -smp 1,sockets=9,cores=32,threads=1,maxcpus=288 \
      -device qemu64-x86_64-cpu,socket-id=8,core-id=30,thread-id=0       \
      -bios x2apic_bios.bin


git gree for testing:
https://github.com/imammedo/qemu.git x2apic_v1

To play with the feature, one would also need x2apic enabled
seabios counterpart:
https://github.com/imammedo/seabios.git x2apic_v3

PS:
As kernel deps it needs 4.8 kernel on host side and it
doesn't include irq remapping/iommu fixes that Radim
has WIP branch, that should be posted separately/on top of this

But even without above kernel boots in x2APIC mode

Igor Mammedov (17):
  numa: reduce code duplication by adding helper numa_get_node_for_cpu()
  acpi: provide _PXM method for CPU devices if QEMU is started numa
    enabled
  tests: acpi: extend cphp testcase with numa check
  pc: acpi: x2APIC support for MADT table
  pc: acpi: x2APIC support for SRAT table
  acpi: cphp: support x2APIC entry in cpu._MAT
  acpi: cphp: force switch to modern cpu hotplug if APIC ID > 254
  pc: leave max apic_id_limit only in legacy cpu hotplug code
  pc: apic_common: extend APIC ID property to 32bit
  pc: apic_common: restore APIC ID to initial ID on reset
  pc: apic_common: reset APIC ID to initial ID when switching into
    x2APIC mode
  pc: kvm_apic: pass APIC ID depending on xAPIC/x2APIC mode
  pc: clarify FW_CFG_MAX_CPUS usage comment
  increase MAX_CPUMASK_BITS from 255 to 288
  pc: add 'etc/boot-cpus' fw_cfg file for machine with more than 255
    CPUs
  pc: add 2.8 machine
  pc: q35: bump max_cpus to 288

root (1):
  linux-headers: update to v4.8-rc1

 include/hw/acpi/acpi-defs.h        |  29 +++++++++
 include/hw/compat.h                |   2 +
 include/hw/i386/apic_internal.h    |   3 +-
 include/hw/i386/pc.h               |   4 ++
 include/sysemu/numa.h              |   3 +
 include/sysemu/sysemu.h            |   2 +-
 linux-headers/linux/kvm.h          |  13 ++++-
 target-i386/cpu.h                  |   1 +
 target-i386/kvm_i386.h             |   1 +
 hw/acpi/cpu.c                      |  17 ++++++
 hw/acpi/cpu_hotplug.c              |  17 ++++--
 hw/arm/virt-acpi-build.c           |   6 +-
 hw/arm/virt.c                      |   9 ++-
 hw/i386/acpi-build.c               | 117 +++++++++++++++++++++++++------------
 hw/i386/kvm/apic.c                 |  13 ++++-
 hw/i386/pc.c                       |  47 ++++++++-------
 hw/i386/pc_piix.c                  |  17 ++++--
 hw/i386/pc_q35.c                   |  14 ++++-
 hw/intc/apic_common.c              |  46 ++++++++++++++-
 hw/ppc/spapr.c                     |   2 +-
 hw/ppc/spapr_cpu_core.c            |   6 +-
 numa.c                             |  12 ++++
 target-i386/cpu.c                  |   2 +-
 target-i386/kvm.c                  |  14 +++++
 tests/acpi-test-data/pc/SRAT.cphp  | Bin 0 -> 304 bytes
 tests/acpi-test-data/q35/SRAT.cphp | Bin 0 -> 304 bytes
 tests/bios-tables-test.c           |   6 +-
 27 files changed, 307 insertions(+), 96 deletions(-)
 create mode 100644 tests/acpi-test-data/pc/SRAT.cphp
 create mode 100644 tests/acpi-test-data/q35/SRAT.cphp

-- 
2.7.4