Message-ID: <20260120080013.2153519-1-anup.patel@oss.qualcomm.com>
Date: Tue, 20 Jan 2026 13:29:46 +0530
From: Anup Patel <anup.patel@....qualcomm.com>
To: Paolo Bonzini <pbonzini@...hat.com>, Atish Patra <atish.patra@...ux.dev>
Cc: Palmer Dabbelt <palmer@...belt.com>, Paul Walmsley <pjw@...nel.org>,
        Alexandre Ghiti <alex@...ti.fr>, Shuah Khan <shuah@...nel.org>,
        Anup Patel <anup@...infault.org>,
        Andrew Jones <andrew.jones@....qualcomm.com>,
        kvm-riscv@...ts.infradead.org, kvm@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org,
        Anup Patel <anup.patel@....qualcomm.com>
Subject: [PATCH 00/27] Nested virtualization for KVM RISC-V

Initial nested virtualization support for KVM RISC-V. Using
this series, we can boot Xvisor inside KVM guest and KVM RISC-V
insmod also works inside KVM guest but we can't run nested guest
at the moment due to work-in-progress G-stage emulation (or
G-stage page table walker).

Patch01-to-Patch09: Fixes and preparatory changes
Patch10-to-Patch23: Actual nested virtualization support
Patch24-to-Patch27: ONE_REG interface and get-reg-list selftest

Upcoming work on-top-of this series include:
 * Software MMU emulation for nested guest (aka swtlb)
 * HLV/HSV emulation
 * Sstc emulation for nested guest
 * SBI NACL for guest hypervisor
 * ... and more ...

These patches can also be found in the riscv_kvm_nested_v1
branch at: https://github.com/avpatel/linux.git

Anup Patel (27):
  RISC-V: KVM: Fix error code returned for Smstateen ONE_REG
  RISC-V: KVM: Fix error code returned for Ssaia ONE_REG
  RISC-V: KVM: Check host Ssaia extension when creating AIA irqchip
  RISC-V: KVM: Introduce common kvm_riscv_isa_check_host()
  RISC-V: KVM: Factor-out ISA checks into separate sources
  RISC-V: KVM: Move timer state defines closer to struct in UAPI header
  RISC-V: KVM: Add hideleg to struct kvm_vcpu_config
  RISC-V: KVM: Factor-out VCPU config into separate sources
  RISC-V: KVM: Don't check hstateen0 when updating sstateen0 CSR
  RISC-V: KVM: Initial skeletal nested virtualization support
  RISC-V: KVM: Use half VMID space for nested guest
  RISC-V: KVM: Extend kvm_riscv_mmu_update_hgatp() for nested
    virtualization
  RISC-V: KVM: Extend kvm_riscv_vcpu_config_load() for nested
    virtualization
  RISC-V: KVM: Extend kvm_riscv_vcpu_update_timedelta() for nested virt
  RISC-V: KVM: Extend trap redirection for nested virtualization
  RISC-V: KVM: Check and inject nested virtual interrupts
  RISC-V: KVM: Extend kvm_riscv_isa_check_host() for nested virt
  RISC-V: KVM: Trap-n-emulate SRET for Guest HS-mode
  RISC-V: KVM: Redirect nested supervisor ecall and breakpoint traps
  RISC-V: KVM: Redirect nested WFI and WRS traps
  RISC-V: KVM: Implement remote HFENCE SBI calls for guest
  RISC-V: KVM: Add CSR emulation for nested virtualization
  RISC-V: KVM: Add HFENCE emulation for nested virtualization
  RISC-V: KVM: Add ONE_REG interface for nested virtualization state
  RISC-V: KVM: selftests: Add nested virt state to get-reg-list test
  RISC-V: KVM: Add ONE_REG interface for nested virtualization CSRs
  RISC-V: KVM: selftests: Add nested virt CSRs to get-reg-list test

 arch/riscv/include/asm/csr.h                  |  17 +
 arch/riscv/include/asm/insn.h                 |   9 +
 arch/riscv/include/asm/kvm_gstage.h           |   2 +
 arch/riscv/include/asm/kvm_host.h             |  29 +-
 arch/riscv/include/asm/kvm_isa.h              |  20 +
 arch/riscv/include/asm/kvm_mmu.h              |   2 +-
 arch/riscv/include/asm/kvm_tlb.h              |  37 +-
 arch/riscv/include/asm/kvm_vcpu_config.h      |  25 ++
 arch/riscv/include/asm/kvm_vcpu_nested.h      | 163 ++++++++
 arch/riscv/include/asm/kvm_vcpu_timer.h       |   1 +
 arch/riscv/include/asm/kvm_vmid.h             |   1 +
 arch/riscv/include/uapi/asm/kvm.h             |  36 +-
 arch/riscv/kvm/Makefile                       |   6 +
 arch/riscv/kvm/aia.c                          |   4 +
 arch/riscv/kvm/aia_device.c                   |   5 +
 arch/riscv/kvm/gstage.c                       |  14 +
 arch/riscv/kvm/isa.c                          | 259 ++++++++++++
 arch/riscv/kvm/main.c                         |  13 +-
 arch/riscv/kvm/mmu.c                          |  18 +-
 arch/riscv/kvm/tlb.c                          | 135 +++++-
 arch/riscv/kvm/vcpu.c                         | 117 ++----
 arch/riscv/kvm/vcpu_config.c                  | 130 ++++++
 arch/riscv/kvm/vcpu_exit.c                    |  62 ++-
 arch/riscv/kvm/vcpu_fp.c                      |   9 +-
 arch/riscv/kvm/vcpu_insn.c                    |  46 +++
 arch/riscv/kvm/vcpu_nested.c                  | 258 ++++++++++++
 arch/riscv/kvm/vcpu_nested_csr.c              | 389 ++++++++++++++++++
 arch/riscv/kvm/vcpu_nested_insn.c             | 140 +++++++
 arch/riscv/kvm/vcpu_nested_swtlb.c            | 146 +++++++
 arch/riscv/kvm/vcpu_onereg.c                  | 334 +++------------
 arch/riscv/kvm/vcpu_pmu.c                     |   5 +-
 arch/riscv/kvm/vcpu_sbi_replace.c             |  63 ++-
 arch/riscv/kvm/vcpu_timer.c                   |  24 +-
 arch/riscv/kvm/vcpu_vector.c                  |   5 +-
 arch/riscv/kvm/vmid.c                         |  33 +-
 .../selftests/kvm/riscv/get-reg-list.c        | 106 ++++-
 36 files changed, 2244 insertions(+), 419 deletions(-)
 create mode 100644 arch/riscv/include/asm/kvm_isa.h
 create mode 100644 arch/riscv/include/asm/kvm_vcpu_config.h
 create mode 100644 arch/riscv/include/asm/kvm_vcpu_nested.h
 create mode 100644 arch/riscv/kvm/isa.c
 create mode 100644 arch/riscv/kvm/vcpu_config.c
 create mode 100644 arch/riscv/kvm/vcpu_nested.c
 create mode 100644 arch/riscv/kvm/vcpu_nested_csr.c
 create mode 100644 arch/riscv/kvm/vcpu_nested_insn.c
 create mode 100644 arch/riscv/kvm/vcpu_nested_swtlb.c

-- 
2.43.0

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