[PATCH v4 0/9] RISC-V KVM virtualize AIA CSRs

[Anup Patel]

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_v4 branch at:
https://github.com/avpatel/linux.git

Based-on: 20230401112730.2105240-1-apatel at ventanamicro.com
(https://lore.kernel.org/lkml/20230401112730.2105240-1-apatel@ventanamicro.com/)

Based-on: 20230403121527.2286489-1-apatel at ventanamicro.com
(https://lore.kernel.org/lkml/20230403121527.2286489-1-apatel@ventanamicro.com/)

Changes since v3:
 - Split PATCH7 into two patches
 - Addressed comments in PATCH7, PATCH8 and PATCH9

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 (9):
  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: Use bitmap for irqs_pending and irqs_pending_mask
  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              | 627 ++++++++++++++++++++++++++++++
 arch/riscv/kvm/main.c             |  23 +-
 arch/riscv/kvm/mmu.c              |   3 +-
 arch/riscv/kvm/vcpu.c             | 190 +++++++--
 arch/riscv/kvm/vcpu_insn.c        |   1 +
 arch/riscv/kvm/vm.c               |   4 +
 arch/riscv/kvm/vmid.c             |   4 +-
 15 files changed, 1083 insertions(+), 58 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