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SubjectRe: [PATCH v2 3/7] RISC-V: KVM: Treat SBI HFENCE calls as NOPs
On Wed, Apr 20, 2022 at 4:25 AM Anup Patel <apatel@ventanamicro.com> wrote:
>
> We should treat SBI HFENCE calls as NOPs until nested virtualization
> is supported by KVM RISC-V. This will help us test booting a hypervisor
> under KVM RISC-V.
>
> Signed-off-by: Anup Patel <apatel@ventanamicro.com>
> ---
> arch/riscv/kvm/vcpu_sbi_replace.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/arch/riscv/kvm/vcpu_sbi_replace.c b/arch/riscv/kvm/vcpu_sbi_replace.c
> index 0f217365c287..3c1dcd38358e 100644
> --- a/arch/riscv/kvm/vcpu_sbi_replace.c
> +++ b/arch/riscv/kvm/vcpu_sbi_replace.c
> @@ -117,7 +117,11 @@ static int kvm_sbi_ext_rfence_handler(struct kvm_vcpu *vcpu, struct kvm_run *run
> case SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA_VMID:
> case SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA:
> case SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA_ASID:
> - /* TODO: implement for nested hypervisor case */
> + /*
> + * Until nested virtualization is implemented, the
> + * SBI HFENCE calls should be treated as NOPs
> + */
> + break;
> default:
> ret = -EOPNOTSUPP;
> }
> --
> 2.25.1
>


Reviewed-by: Atish Patra <atishp@rivosinc.com>
--
Regards,
Atish

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