This series adds a vcpu knob to request a specific PSCI version
from KVM via the KVM_REG_ARM_PSCI_VERSION FW register.

The use case for this is to support migration between host kernels
that differ in their default (a.k.a. most recent) PSCI version.

Note: in order to support PSCI v0.1 we need to drop vcpu
initialization with KVM_CAP_ARM_PSCI_0_2 in that case.
Alternatively we could limit support to versions >=0.2 .

Changes since V1 [1]:
* incorporated feedback from Peter and Eric

[1] https://lore.kernel.org/kvmarm/20250911144923.24259-1-sebott@redhat.com/

Sebastian Ott (2):
  target/arm/kvm: add constants for new PSCI versions
  target/arm/kvm: add kvm-psci-version vcpu property

 docs/system/arm/cpu-features.rst |  5 +++
 target/arm/cpu.h                 |  6 ++++
 target/arm/kvm-consts.h          |  2 ++
 target/arm/kvm.c                 | 60 +++++++++++++++++++++++++++++++-
 4 files changed, 72 insertions(+), 1 deletion(-)

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2.42.0