On Tue, Jan 20, 2026 at 1:30 PM Anup Patel <[email protected]> wrote: > > 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
Patches 1-to-3 are already merged as fixes. Queued patches 4-to-9 for Linux-7.1 Thanks, Anup > > 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 >
