[PATCH 0/8] riscv: AIA: kernel-irqchip=off support

[Yong-Xuan Wang <yongxuan.wang@sifive.com>]

This series introduces the user-space AIA MSI emulation when using KVM
acceleration.

After this series, RISC-V QEMU virt machine with KVM acceleration has
3 parameters to control the type of irqchip and its emulation method:
- Machine prop "aia" controls the type of irqchip
  - none: use PLIC and emulated in user-space
  - aplic: use AIA wired and emulated in user-space
  - aplic-imsic: use AIA MSI, emulation mode is determined by
    "kernel-irqchip" and "riscv-imsic"
- Accel prop "kernel-irqchip", effective with AIA MSI
  - on: in-kernel APLIC and in-kernel IMSIC
  - off: user-space APLIC and user-space IMSIC
  - split: user-space APLIC and in-kernel IMSIC
- Accel prop "kernel-irqchip", effective with in-kernel IMSIC
  - emul: use MRIF as in-kernel IMSIC
  - hw: use hardware guest IMSIC file as in-kernel IMSIC
  - auto: use the hardware guest IMSICs whenever available otherwise
    fallback to MRIF

Yong-Xuan Wang (8):
  target/riscv/kvm: rewrite get/set for KVM_REG_RISCV_CSR
  target/riscv/kvm: add KVM_REG_RISCV_CSR_AIA
  target/riscv/kvm: add KVM_REG_RISCV_CSR_SMSTATEEN
  target/riscv: add helper to get CSR name
  target/riscv/kvm: rewrite kvm_riscv_handle_csr
  target/riscv/kvm: add CSR_SIREG and CSR_STOPEI emulation
  target/riscv/kvm: rename riscv-aia to riscv-imsic
  docs: update the description about RISC-V AIA

 docs/specs/riscv-aia.rst   |  24 +++-
 docs/system/riscv/virt.rst |  10 +-
 target/riscv/cpu.h         |   8 +-
 target/riscv/csr.c         |  30 ++--
 target/riscv/kvm/kvm-cpu.c | 287 +++++++++++++++++++++++++++++--------
 5 files changed, 266 insertions(+), 93 deletions(-)

-- 
2.17.1