[PATCH v3 0/8] RISC-V KVM virtualize AIA CSRs

Anup Patel
2023-04-03T09:33:42Z

The RISC-V AIA specification is now frozen as-per the RISC-V international
process. The latest frozen specifcation can be found at:
https://github.com/riscv/riscv-aia/releases/download/1.0-RC3/riscv-interrupts-1.0-RC3.pdf

This series implements first phase of AIA virtualization which targets
virtualizing AIA CSRs. This also provides a foundation for the second
phase of AIA virtualization which will target in-kernel AIA irqchip
(including both IMSIC and APLIC).

The first two patches are shared with the "Linux RISC-V AIA Support"
series which adds AIA driver support.

To test this series, use AIA drivers from the "Linux RISC-V AIA Support"
series and use KVMTOOL from the riscv_aia_v1 branch at:
https://github.com/avpatel/kvmtool.git

These patches can also be found in the riscv_kvm_aia_csr_v3 branch at:
https://github.com/avpatel/linux.git

Changes since v2:
- Rebased on Linux-6.3-rc5
- Split PATCH5 into two separate patches as suggested by Atish.

Changes since v1:
- Addressed from Drew and Conor in PATCH1
- Use alphabetical ordering for SMAIA and SSAIA enum in PATCH2
- Use GENMASK() in PATCH3

Anup Patel (8):
RISC-V: Add AIA related CSR defines
RISC-V: Detect AIA CSRs from ISA string
RISC-V: KVM: Drop the _MASK suffix from hgatp.VMID mask defines
RISC-V: KVM: Initial skeletal support for AIA
RISC-V: KVM: Implement subtype for CSR ONE_REG interface
RISC-V: KVM: Add ONE_REG interface for AIA CSRs
RISC-V: KVM: Virtualize per-HART AIA CSRs
RISC-V: KVM: Implement guest external interrupt line management

arch/riscv/include/asm/csr.h | 107 ++++-
arch/riscv/include/asm/hwcap.h | 8 +
arch/riscv/include/asm/kvm_aia.h | 137 +++++++
arch/riscv/include/asm/kvm_host.h | 14 +-
arch/riscv/include/uapi/asm/kvm.h | 18 +-
arch/riscv/kernel/cpu.c | 2 +
arch/riscv/kernel/cpufeature.c | 2 +
arch/riscv/kvm/Makefile | 1 +
arch/riscv/kvm/aia.c | 624 ++++++++++++++++++++++++++++++
arch/riscv/kvm/main.c | 23 +-
arch/riscv/kvm/mmu.c | 3 +-
arch/riscv/kvm/vcpu.c | 185 +++++++--
arch/riscv/kvm/vcpu_insn.c | 1 +
arch/riscv/kvm/vm.c | 4 +
arch/riscv/kvm/vmid.c | 4 +-
15 files changed, 1077 insertions(+), 56 deletions(-)
create mode 100644 arch/riscv/include/asm/kvm_aia.h
create mode 100644 arch/riscv/kvm/aia.c

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2.34.1