Re: [PATCH v2 0/4] KVM: riscv: Fix Spectre-v1 vulnerabilities in register access

[Anup Patel]

On Tue, Mar 3, 2026 at 7:49 PM Lukas Gerlach <lukas.gerlach@xxxxxxxx> wrote:
>
> This series adds array_index_nospec() to RISC-V KVM to prevent
> speculative out-of-bounds access to kernel memory.
>
> Similar fixes exist for x86 (ioapic, lapic, PMU) and arm64 (vgic).
>
> Signed-off-by: Lukas Gerlach <lukas.gerlach@xxxxxxxx>
> ---
> Changes in v2:
> Add array_index_nospec() to four additional sites in vcpu_pmu.c
> (Radim Krčmář)
>
> ---
> Lukas Gerlach (4):
>       KVM: riscv: Fix Spectre-v1 in ONE_REG register access
>       KVM: riscv: Fix Spectre-v1 in AIA CSR access
>       KVM: riscv: Fix Spectre-v1 in floating-point register access
>       KVM: riscv: Fix Spectre-v1 in PMU counter access
>
>  arch/riscv/kvm/aia.c         | 11 +++++++++--
>  arch/riscv/kvm/vcpu_fp.c     | 17 +++++++++++++----
>  arch/riscv/kvm/vcpu_onereg.c | 36 ++++++++++++++++++++++++++++--------
>  arch/riscv/kvm/vcpu_pmu.c    | 14 +++++++++++---
>  4 files changed, 61 insertions(+), 17 deletions(-)

Queued these patches as fixes for Linux-7.0-rcX

Thanks,
Anup