Changes since v1:
- rebase on top of 2.7
- drop add 2.8 machine and linux headers update patches
- drop numa related patches (will post separately as unrelated)
- change default mc->maxcpus only for q35
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 \
-device intel-iommu,intremap=on -machine kernel_irqchip=split \
-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_v2
To play with the feature, one would also need x2apic enabled
seabios counterpart:
https://github.com/imammedo/seabios.git x2apic_v4
Igor Mammedov (14):
numa: reduce code duplication by adding helper numa_get_node_for_cpu()
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: q35: bump max_cpus to 288
include/hw/acpi/acpi-defs.h | 29 ++++++++++
include/hw/i386/apic_internal.h | 3 +-
include/sysemu/numa.h | 3 ++
include/sysemu/sysemu.h | 2 +-
target-i386/cpu.h | 1 +
target-i386/kvm_i386.h | 1 +
hw/acpi/cpu.c | 5 ++
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 | 45 ++++++++--------
hw/i386/pc_q35.c | 2 +
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 +++++
20 files changed, 249 insertions(+), 86 deletions(-)
--
2.7.4
