| Message ID | 20250217081730.9000-1-yongxuan.wang@sifive.com (mailing list archive) |
|---|---|
| Headers | show |
| Series | riscv: AIA: kernel-irqchip=off support | expand |
On Mon, Feb 17, 2025 at 04:17:20PM +0800, Yong-Xuan Wang wrote: > 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 Hi; as someone new to the RISC-V ecosystem, most of these acronyms feel impenetrable :-) I see they're all RISC-V interrupt-handling related terms. I hope you don't mind my spelling them out here: - AIA : Advanced Interrupt Architecture - MSI : Message Signaled Interrupts - PLIC : Platform-Level Interrupt Controller - APLIC : Advanced Platform Level Interrupt Controller - IMSIC : Incoming Message Signaled Interrupt Controller - MRIF : Message Routed Interrupt Facility [...]
Hi Kashyap, On Tue, Feb 18, 2025 at 11:53 PM Kashyap Chamarthy <kchamart@redhat.com> wrote: > > On Mon, Feb 17, 2025 at 04:17:20PM +0800, Yong-Xuan Wang wrote: > > 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 > > Hi; as someone new to the RISC-V ecosystem, most of these acronyms feel > impenetrable :-) I see they're all RISC-V interrupt-handling related > terms. I hope you don't mind my spelling them out here: > > - AIA : Advanced Interrupt Architecture > - MSI : Message Signaled Interrupts > - PLIC : Platform-Level Interrupt Controller > - APLIC : Advanced Platform Level Interrupt Controller > - IMSIC : Incoming Message Signaled Interrupt Controller > - MRIF : Message Routed Interrupt Facility > > [...] > > -- > /kashyap > Sure. I would add them into the next version. Thank you! Regards, Yong-Xuan
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(-)