[PATCH 0/3] Improve instruction and CSR emulation in KVM RISC-V

Anup Patel apatel at ventanamicro.com
Thu Jun 9 22:05:52 PDT 2022

Currently, the instruction emulation for MMIO traps and Virtual instruction
traps co-exist with general VCPU exit handling. The instruction and CSR
emulation will grow with upcoming SBI PMU, AIA, and Nested virtualization
in KVM RISC-V. In addition, we also need a mechanism to allow user-space
emulate certain CSRs under certain situation (example, host has AIA support
but user-space does not wants to use in-kernel AIA IMSIC and APLIC support).

This series improves instruction and CSR emulation in KVM RISC-V to make
it extensible based on above.

These patches can also be found in riscv_kvm_csr_v1 branch at:

Anup Patel (3):
  RISC-V: KVM: Factor-out instruction emulation into separate sources
  RISC-V: KVM: Add extensible system instruction emulation framework
  RISC-V: KVM: Add extensible CSR emulation framework

 arch/riscv/include/asm/kvm_host.h           |  16 +-
 arch/riscv/include/asm/kvm_vcpu_insn.h      |  48 ++
 arch/riscv/kvm/Makefile                     |   1 +
 arch/riscv/kvm/vcpu.c                       |  11 +
 arch/riscv/kvm/vcpu_exit.c                  | 490 +----------------
 arch/riscv/kvm/{vcpu_exit.c => vcpu_insn.c} | 560 +++++++++++---------
 include/uapi/linux/kvm.h                    |   8 +
 7 files changed, 382 insertions(+), 752 deletions(-)
 create mode 100644 arch/riscv/include/asm/kvm_vcpu_insn.h
 copy arch/riscv/kvm/{vcpu_exit.c => vcpu_insn.c} (64%)


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