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-aia". This can only be used
when the host machine support the AIA extension.
- 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 "riscv-aia", 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
Glossary
- PLIC: Platform-Level Interrupt Controller
- AIA: Advanced Interrupt Architecture
- APLIC: Advanced Platform Level Interrupt Controller
- IMSIC: Incoming Message Signaled Interrupt Controller
- MSI: Message Signaled Interrupts
- MRIF: Message Routed Interrupt Facility
---
v2:
- Add glossary of RISC-V irqchips in cover letter (Kashyap)
- Add assertions in riscv_get_csr_name() of PATCH4 (Andrew)
- remove the changing of property name (Andrew)
- Add PATCH8 to prevent the usage of IMSIC devices when the host
machine doesn't support the AIA extension.
- fix typo in cover letter
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
docs: update the description about RISC-V AIA
hw/intc/imsic: prevent to use IMSIC when host doesn't support AIA
extension
docs/specs/riscv-aia.rst | 24 +++-
docs/system/riscv/virt.rst | 10 +-
hw/intc/riscv_imsic.c | 17 ++-
target/riscv/cpu.h | 10 +-
target/riscv/csr.c | 30 ++---
target/riscv/kvm/kvm-cpu.c | 235 +++++++++++++++++++++++++++++++------
6 files changed, 254 insertions(+), 72 deletions(-)
--
2.17.1
