[Note: References are present at the last after the revision history] Virtual CPU hotplug support is being added across various architectures [1][3]. This series adds various code bits common across all architectures:
1. vCPU creation and Parking code refactor [Patch 1] 2. Update ACPI GED framework to support vCPU Hotplug [Patch 2,3] 3. ACPI CPUs AML code change [Patch 4,5] 4. Helper functions to support unrealization of CPU objects [Patch 6,7] Repository: [*] Architecture *Agnostic* Patch-set (This series) V14: https://github.com/salil-mehta/qemu.git virt-cpuhp-armv8/rfc-v3.arch.agnostic.v15 NOTE: This series is meant to work in conjunction with the architecture-specific patch-set. For ARM, a combined patch-set (architecture agnostic + specific) was earlier pushed as RFC V2 [1]. Later, RFC V2 was split into the ARM Architecture specific patch-set RFC V3 [4] (a subset of RFC V2) and the architecture agnostic patch-set. Patch-set V16 is the latest version in that series. This series works in conjunction with RFC V4-rc3, present at the following link. [*] ARM Architecture *Specific* Patch-set RFC V3 [4]: https://github.com/salil-mehta/qemu.git virt-cpuhp-armv8/rfc-v3 RFC V4-rc3: https://github.com/salil-mehta/qemu.git virt-cpuhp-armv8/rfc-v4-rc3 (combined) Revision History: Patch-set V15 -> V16 1. Addressed feedbacks from Igor Mammedov on [PATCH V15 1/7,3/7,7/7] - Fixed the checkpatch.pl errors and warnings - Made initialization of CPU hotplug regions within GED realize conditional - Collected {Reviewed,Acked}-Bys for [PATCH V15 1/7,2/7,4/7,5/7,7/7] Link: https://lore.kernel.org/qemu-devel/20240713182516.1457-1-salil.me...@huawei.com/ Patch-set V14 -> V15 1. Addressed comment by Igor Mammedov on [PATCH V14 4/7] - Removed ACPI_CPU_SCAN_METHOD - Introduced AML_GED_EVT_CPU_SCAN_METHOD ("\\_SB.GED.CPSCN") macro 2. Fix the stray change of "assert (" in "PATCH V14 3/7" Link: https://lore.kernel.org/qemu-devel/20240712134201.214699-4-salil.me...@huawei.com/ Patch-set V13 -> V14 1. Addressed Igor Mammedov's following review comments - Mentioned abput new external APIs in the header note of [PATCH 1/7] - Merged Doc [PATCH V13 8/8] with [PATCH V14 3/7] - Introduced GED realize function for various CPU Hotplug regions initializations - Added back event handler method to indirectly expose \\_SB.CPUS.CSCN to GED _EVT. Like for ARM, it would be through \\_SB.GED.CSCN event handler method - Collected the Ack given for [Patch V13 6/8] - Added back the gfree'ing of GDB regs in common finalize and made it conditional - Updated the header notes of [PATCH V13 3/8,4/8,5/8] to reflect the changes Patch-set V12 -> V13 1. Added Reviewed-by Tag of Harsh Prateek Bora's (IBM) [PATCH V12 1/8] 2. Moved the kvm_{create,park,unpark}_vcpu prototypes from accel/kvm/kvm-cpus.h to include/sysemu/kvm.h. These can later be exported through AccelOps. Link: https://lore.kernel.org/qemu-devel/62f55169-1796-4d8e-a35d-7f003a172...@linux.ibm.com/ Patch-set V11 -> V12 1. Addressed Harsh Prateek Bora's (IBM) comment - Changed @cpu to @vcpu_id in the kvm_unpark_vcpu protoype header/ 2. Added Zhao Liu's (Intel) Tested-by for whole series - Qtest does not breaks on Intel platforms now. 3. Added Zhao Liu's (Intel) Reviewed-by for [PATCH V11 {1/8 - 3/8}] Link: https://lore.kernel.org/qemu-devel/zlrspujgbgyeu...@intel.com/ Link: https://lore.kernel.org/qemu-devel/a5f3d78e-cfed-441f-9c56-e3e78fa5e...@linux.ibm.com/ Patch-set V10 -> V11 1. Addressed Nicholas Piggin's (IBM) comment - moved the traces in kvm_unpark_vcpu and kvm_create_vcpu at the end - Added the Reviewed-by Tag for [PATCH V10 1/8] 2. Addressed Alex Bennée's (Linaro) comments - Added a note explaining dependency of the [PATCH V10 7/8] on Arch specific patch-set Link: https://lore.kernel.org/qemu-devel/d1fs5goofwwk.2pnrivl0v6...@gmail.com/ Link: https://lore.kernel.org/qemu-devel/87frubi402....@draig.linaro.org/ Patch-set V9 -> V10 1. Addressed Nicholas Piggin's (IBM) & Philippe Mathieu-Daudé (Linaro) comments - carved out kvm_unpark_vcpu and added its trace - Widened the scope of the kvm_unpark_vcpu so that it can be used by generic framework being thought out Link: https://lore.kernel.org/qemu-devel/20240519210620.228342-1-salil.me...@huawei.com/ Link: https://lore.kernel.org/qemu-devel/e94b0e14-efee-4050-9c9f-08382a36b...@linaro.org/ Patch-set V8 -> V9 1. Addressed Vishnu Pajjuri's (Ampere) comments - Added kvm_fd to trace in kvm_create_vcpu - Some clean ups: arch vcpu-id and sbd variable - Added the missed initialization of cpu->gdb_num_regs 2. Addressed the commnet from Zhao Liu (Intel) - Make initialization of CPU Hotplug state conditional (possible_cpu_arch_ids!=NULL) Link: https://lore.kernel.org/qemu-devel/20240312020000.12992-1-salil.me...@huawei.com/ Patch-set V7 -> V8 1. Rebased and Fixed the conflicts Patch-set V6 -> V7 1. Addressed Alex Bennée's comments - Updated the docs 2. Addressed Igor Mammedov's comments - Merged patches [Patch V6 3/9] & [Patch V6 7/9] with [Patch V6 4/9] - Updated commit-log of [Patch V6 1/9] and [Patch V6 5/9] 3. Added Shaoqin Huang's Reviewed-by tags for whole series. Link: https://lore.kernel.org/qemu-devel/20231013105129.25648-1-salil.me...@huawei.com/ Patch-set V5 -> V6 1. Addressed Gavin Shan's comments - Fixed the assert() ranges of address spaces - Rebased the patch-set to latest changes in the qemu.git - Added Reviewed-by tags for patches {8,9} 2. Addressed Jonathan Cameron's comments - Updated commit-log for [Patch V5 1/9] with mention of trace events - Added Reviewed-by tags for patches {1,5} 3. Added Tested-by tags from Xianglai Li 4. Fixed checkpatch.pl error "Qemu -> QEMU" in [Patch V5 1/9] Link: https://lore.kernel.org/qemu-devel/20231011194355.15628-1-salil.me...@huawei.com/ Patch-set V4 -> V5 1. Addressed Gavin Shan's comments - Fixed the trace events print string for kvm_{create,get,park,destroy}_vcpu - Added Reviewed-by tag for patch {1} 2. Added Shaoqin Huang's Reviewed-by tags for Patches {2,3} 3. Added Tested-by Tag from Vishnu Pajjuri to the patch-set 4. Dropped the ARM specific [Patch V4 10/10] Link: https://lore.kernel.org/qemu-devel/20231009203601.17584-1-salil.me...@huawei.com/ Patch-set V3 -> V4 1. Addressed David Hilderbrand's comments - Fixed the wrong doc comment of kvm_park_vcpu API prototype - Added Reviewed-by tags for patches {2,4} Link: https://lore.kernel.org/qemu-devel/20231009112812.10612-1-salil.me...@huawei.com/ Patch-set V2 -> V3 1. Addressed Jonathan Cameron's comments - Fixed 'vcpu-id' type wrongly changed from 'unsigned long' to 'integer' - Removed unnecessary use of variable 'vcpu_id' in kvm_park_vcpu - Updated [Patch V2 3/10] commit-log with details of ACPI_CPU_SCAN_METHOD macro - Updated [Patch V2 5/10] commit-log with details of conditional event handler method - Added Reviewed-by tags for patches {2,3,4,6,7} 2. Addressed Gavin Shan's comments - Remove unnecessary use of variable 'vcpu_id' in kvm_par_vcpu - Fixed return value in kvm_get_vcpu from -1 to -ENOENT - Reset the value of 'gdb_num_g_regs' in gdb_unregister_coprocessor_all - Fixed the kvm_{create,park}_vcpu prototypes docs - Added Reviewed-by tags for patches {2,3,4,5,6,7,9,10} 3. Addressed one earlier missed comment by Alex Bennée in RFC V1 - Added traces instead of DPRINTF in the newly added and some existing functions Link: https://lore.kernel.org/qemu-devel/20230930001933.2660-1-salil.me...@huawei.com/ Patch-set V1 -> V2 1. Addressed Alex Bennée's comments - Refactored the kvm_create_vcpu logic to get rid of goto - Added the docs for kvm_{create,park}_vcpu prototypes - Splitted the gdbstub and AddressSpace destruction change into separate patches - Added Reviewed-by tags for patches {2,10} Link: https://lore.kernel.org/qemu-devel/20230929124304.13672-1-salil.me...@huawei.com/ References: [1] https://lore.kernel.org/qemu-devel/20230926100436.28284-1-salil.me...@huawei.com/ [2] https://lore.kernel.org/all/20230913163823.7880-1-james.mo...@arm.com/ [3] https://lore.kernel.org/qemu-devel/cover.1695697701.git.lixiang...@loongson.cn/ [4] https://lore.kernel.org/qemu-devel/20240613233639.202896-2-salil.me...@huawei.com/ Salil Mehta (7): accel/kvm: Extract common KVM vCPU {creation,parking} code hw/acpi: Move CPU ctrl-dev MMIO region len macro to common header file hw/acpi: Update ACPI GED framework to support vCPU Hotplug hw/acpi: Update GED _EVT method AML with CPU scan hw/acpi: Update CPUs AML with cpu-(ctrl)dev change physmem: Add helper function to destroy CPU AddressSpace gdbstub: Add helper function to unregister GDB register space accel/kvm/kvm-all.c | 95 +++++++++++++++++--------- accel/kvm/kvm-cpus.h | 1 - accel/kvm/trace-events | 5 +- docs/specs/acpi_hw_reduced_hotplug.rst | 3 +- gdbstub/gdbstub.c | 13 ++++ hw/acpi/acpi-cpu-hotplug-stub.c | 6 ++ hw/acpi/cpu.c | 18 +++-- hw/acpi/generic_event_device.c | 50 ++++++++++++++ hw/core/cpu-common.c | 5 +- hw/i386/acpi-build.c | 3 +- include/exec/cpu-common.h | 8 +++ include/exec/gdbstub.h | 6 ++ include/hw/acpi/cpu.h | 7 +- include/hw/acpi/generic_event_device.h | 5 ++ include/hw/core/cpu.h | 1 + include/sysemu/kvm.h | 25 +++++++ system/physmem.c | 29 ++++++++ 17 files changed, 236 insertions(+), 44 deletions(-) -- 2.34.1
