[PATCH 0/3] RISC-V: KVM: AIA: Convert HGEI management to fully per-HART

guoren
2026-04-21T14:55:31Z

From: "Guo Ren (Alibaba DAMO Academy)" <guoren@kernel.org>

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.

Guo Ren (Alibaba DAMO Academy) (3):
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: Remove global nr_guest_files after KVM AIA
per-HART conversion

arch/riscv/include/asm/kvm_aia.h | 2 +-
arch/riscv/kvm/aia.c | 58 ++++++++++++++-----------
arch/riscv/kvm/aia_device.c | 4 +-
arch/riscv/kvm/main.c | 3 +-
drivers/irqchip/irq-riscv-imsic-state.c | 12 +----
include/linux/irqchip/riscv-imsic.h | 3 --
6 files changed, 37 insertions(+), 45 deletions(-)

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2.40.1