[PATCH V2 0/4] RISC-V: KVM: AIA: Convert HGEI management to fully per-HART

guoren
2026-04-25T00:59:42Z

This short series converts RISC-V KVM AIA's Hypervisor Guest External
Interrupt (HGEI) line management from a global "one-size-fits-all"
model to a fully per-HART (per-CPU) model. It also performs the
corresponding cleanup in the IMSIC irqchip driver.

The motivation is to properly support heterogeneous RISC-V SoCs
(big.LITTLE, multi-vendor core mixes) where different HARTs may
expose different numbers of guest interrupt files / HGEIE bits.
The old global `kvm_riscv_aia_nr_hgei` and
`imsic_global_config::nr_guest_files` assumptions are no longer
tenable and are removed.

After this series, HGEI allocation, freeing, and interrupt delivery
are completely per-HART, the code is simpler and clearer, and there
are no remaining global assumptions about guest interrupt file
counts.

Changelog:
V2:
- Add per-HART IMSIC guest files to compute final HGEI count.
- Add min(local->nr_guest_files, nr_guest_files);

V1:
https://lore.kernel.org/kvm-riscv/20260421145451.1597930-1-guoren@kernel.org/

Guo Ren (Alibaba DAMO Academy) (4):
RISC-V: KVM: AIA: Make HGEI number and management fully per-CPU
RISC-V: KVM: AIA: Replace global HGEI count with simple enabled bool
irqchip/riscv-imsic: Move nr_guest_files to per-HART local config
RISC-V: KVM: AIA: Use per-HART IMSIC guest files to compute final HGEI
count

arch/riscv/include/asm/kvm_aia.h | 2 +-
arch/riscv/kvm/aia.c | 66 +++++++++++++++----------
arch/riscv/kvm/aia_device.c | 4 +-
arch/riscv/kvm/main.c | 3 +-
drivers/irqchip/irq-riscv-imsic-state.c | 10 ++--
include/linux/irqchip/riscv-imsic.h | 6 +--
6 files changed, 53 insertions(+), 38 deletions(-)

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2.43.0