[PATCH v6 0/8] RISC-V: KVM: Add Svadu/Zicfiss/Zicfilp FWFT support

[Anup Patel]

On Mon, Jul 13, 2026 at 6:33 AM Inochi Amaoto <inochiama at gmail.com> wrote:
>
> This patchset based on the patchset "RISC-V: KVM: Add Zicfiss/Zicfilp
> support".
>
> The patch includes all the function of original patchset from Quan:
> adding the Svadu/Zicfiss/Zicfilp FWFT for the RISC-V KVM. And this
> patchset already passes the KVM unit test.
>
> Test with the patch applied
> https://lore.kernel.org/all/20260618064406.14508-1-cuiyunhui@bytedance.com/
>
> Changed from v5:
> - https://lore.kernel.org/kvm/20260706022046.214956-1-inochiama@gmail.com/
> patch 1, 5:
> 1. Switch to csr_read()/csr_write() to update csr
> patch 8:
> 1. Fix the macro name.
>
> Changed from v4:
> - https://lore.kernel.org/kvm/20260701020746.170157-1-inochiama@gmail.com/
> patch 1:
> 1. Use NACL for csr update
> 2. Check ISA mapping before cleaning the ADUE bit
> patch 4:
> 1. Clear the zicfiss csr during a VCPU reset
> 2. Add zicfiss csr to num_csr_regs()
> patch 6:
> 1. Cleanup SPELP after redirecting the trap
> patch 7:
> 1. Use interrupt bit instead of number for masking/unmasking
> patch 8:
> 1. Add missing entry for the test
> 2. Fix the wrong comment.
>
> Changed from v3:
> - https://lore.kernel.org/kvm/20260607081105.993908-1-inochiama@gmail.com/
> 1. rebase to the v7.2-rc1
> 2. Tested with the updated Svadu patch
> 3. Remove the dependency as it is already merged.
>
> Changed from v2:
> - https://lore.kernel.org/kvm/20260601084336.2601675-1-inochiama@gmail.com/
> 1. rebase with Yong-Xuan's patch set
> 2. Add SSP CSR context switch/set/get
> 3. Move the software-check exception set/unset into FWFT
> 4. Only delegate software-check exception when Zicfiss/Zicfilp is enabled.
> 5. Make KVM SBI_FWFT_PTE_AD_HW_UPDATING depends on both Svadu and Svade
>    enabled.
>
> Changed from Quan's v1:
> - https://lore.kernel.org/kvm/cover.1764509485.git.zhouquan@iscas.ac.cn/
> 1. rebase to the latest master.
> 2. Split Svadu change as separate patch
> 3. Fix all build error from the original series
> 4. Remove the Svadu check in kvm_riscv_vcpu_config_ran_once() and in
>    favor of the FWFT.
> 5. Remove the LPE/SSE setting bit in kvm_riscv_vcpu_config_ran_once()
>    (kvm_riscv_vcpu_setup_config() in original patchset)
>
> Inochi Amaoto (8):
>   RISC-V: KVM: Add support for Svadu FWFT features
>   KVM: riscv: selftests: add Svadu FWFT extension to get-reg-list test
>   RISC-V: KVM: Allow Zicfiss/Zicfilp extensions for Guest/VM
>   RISC-V: KVM: Add ssp context save/restore
>   RISC-V: KVM: Handle software-check exits for VCPU
>   RISC-V: KVM: Delegate SPELP bit to VS/VU mode if landing pad is
>     enabled.
>   RISC-V: KVM: Add support for control-flow integrity FWFT features
>   KVM: riscv: selftests: add Zicfiss/Zicfilp extension to get-reg-list
>     test
>
>  arch/riscv/include/asm/csr.h                  |   1 +
>  arch/riscv/include/asm/kvm_host.h             |   7 +
>  arch/riscv/include/uapi/asm/kvm.h             |  13 ++
>  arch/riscv/kvm/isa.c                          |   2 +
>  arch/riscv/kvm/vcpu.c                         |   7 +
>  arch/riscv/kvm/vcpu_exit.c                    |  11 ++
>  arch/riscv/kvm/vcpu_onereg.c                  |  68 ++++++-
>  arch/riscv/kvm/vcpu_sbi_fwft.c                | 183 ++++++++++++++++++
>  .../selftests/kvm/riscv/get-reg-list.c        |  90 +++++++++
>  9 files changed, 380 insertions(+), 2 deletions(-)
>
> --
> 2.55.0
>

I have taken care of my comments in PATCH1 and PATCH5
at the time of merging this series.

Queued this series for Linux-7.3

Thanks,
Anup