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hw/acpi: Make CPUs ACPI presence conditional during vCPU hot-unplug

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On most architectures, during vCPU hot-plug and hot-unplug actions, the
firmware or VMM/QEMU can update the OS on vCPU status by toggling the
ACPI method `_STA.Present` bit. However, certain CPU architectures
prohibit [1] modifications to a CPU’s `presence` status after the kernel
has booted.

This limitation [2][3] exists because many per-CPU components, such as
interrupt controllers and various per-CPU features tightly integrated
with CPUs, may not support reconfiguration once the kernel is
initialized. Often, these components cannot be powered down, as they may
belong to an `always-on` power domain. As a result, some architectures
require all CPUs to remain `_STA.Present` after system initialization.

Therefore, it is essential to mirror the exact QOM vCPU status through
ACPI for the Guest kernel. For this, we should determine—via
architecture-specific code[4]—whether vCPUs must always remain present
and whether the associated `AcpiCpuStatus::cpu` object should remain
valid, even following a vCPU hot-unplug operation.

References:
[1] Check comment 5 in the bugzilla entry
    Link: https://bugzilla.tianocore.org/show_bug.cgi?id=4481#c5
[2] KVMForum 2023 Presentation: Challenges Revisited in Supporting Virt CPU Hotplug on
    architectures that don’t Support CPU Hotplug (like ARM64)
    a. Kernel Link: https://kvm-forum.qemu.org/2023/KVM-forum-cpu-hotplug_7OJ1YyJ.pdf
    b. Qemu Link:  https://kvm-forum.qemu.org/2023/Challenges_Revisited_in_Supporting_Virt_CPU_Hotplug_-__ii0iNb3.pdf
[3] KVMForum 2020 Presentation: Challenges in Supporting Virtual CPU Hotplug on
    SoC Based Systems (like ARM64)
    Link: https://kvmforum2020.sched.com/event/eE4m
[4] Example implementation of architecture-specific CPU persistence hook
    Link: c0b416b11e

Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
Message-Id: <20241103102419.202225-2-salil.mehta@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Salil Mehta 2024-11-03 10:24:15 +00:00 committed by Michael S. Tsirkin
parent 26f2660bf7
commit 2d6cfbaf17
2 changed files with 15 additions and 1 deletions
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15
hw/acpi/cpu.c
View File

@ -233,6 +233,17 @@ void cpu_hotplug_hw_init(MemoryRegion *as, Object *owner,
memory_region_add_subregion(as, base_addr, &state->ctrl_reg);
}
static bool should_remain_acpi_present(DeviceState *dev)
{
CPUClass *k = CPU_GET_CLASS(dev);
/*
* A system may contain CPUs that are always present on one die, NUMA node,
* or socket, yet may be non-present on another simultaneously. Check from
* architecture specific code.
*/
return k->cpu_persistent_status && k->cpu_persistent_status(CPU(dev));
}
static AcpiCpuStatus *get_cpu_status(CPUHotplugState *cpu_st, DeviceState *dev)
{
CPUClass *k = CPU_GET_CLASS(dev);
@ -289,7 +300,9 @@ void acpi_cpu_unplug_cb(CPUHotplugState *cpu_st,
return;
}
cdev->cpu = NULL;
if (!should_remain_acpi_present(dev)) {
cdev->cpu = NULL;
}
}
static const VMStateDescription vmstate_cpuhp_sts = {

1
include/hw/core/cpu.h
View File

@ -158,6 +158,7 @@ struct CPUClass {
void (*dump_state)(CPUState *cpu, FILE *, int flags);
void (*query_cpu_fast)(CPUState *cpu, CpuInfoFast *value);
int64_t (*get_arch_id)(CPUState *cpu);
bool (*cpu_persistent_status)(CPUState *cpu);
void (*set_pc)(CPUState *cpu, vaddr value);
vaddr (*get_pc)(CPUState *cpu);
int (*gdb_read_register)(CPUState *cpu, GByteArray *buf, int reg);