Re: [PATCH 02/15] RISC-V: KVM: Allow Zbc extension for Guest/VM

Andrew Jones
2023-12-13T17:17:05Z

On Tue, Nov 28, 2023 at 08:23:44PM +0530, Anup Patel wrote:
> We extend the KVM ISA extension ONE_REG interface to allow KVM
> user space to detect and enable Zbc extension for Guest/VM.
>
> Signed-off-by: Anup Patel <apatel@ventanamicro.com>
> ---
> arch/riscv/include/uapi/asm/kvm.h | 1 +
> arch/riscv/kvm/vcpu_onereg.c | 2 ++
> 2 files changed, 3 insertions(+)
>
> diff --git a/arch/riscv/include/uapi/asm/kvm.h b/arch/riscv/include/uapi/asm/kvm.h
> index 60d3b21dead7..518b368b41e5 100644
> --- a/arch/riscv/include/uapi/asm/kvm.h
> +++ b/arch/riscv/include/uapi/asm/kvm.h
> @@ -139,6 +139,7 @@ enum KVM_RISCV_ISA_EXT_ID {
> KVM_RISCV_ISA_EXT_ZIHPM,
> KVM_RISCV_ISA_EXT_SMSTATEEN,
> KVM_RISCV_ISA_EXT_ZICOND,
> + KVM_RISCV_ISA_EXT_ZBC,
> KVM_RISCV_ISA_EXT_MAX,
> };
>
> diff --git a/arch/riscv/kvm/vcpu_onereg.c b/arch/riscv/kvm/vcpu_onereg.c
> index f8c9fa0c03c5..f789517c9fae 100644
> --- a/arch/riscv/kvm/vcpu_onereg.c
> +++ b/arch/riscv/kvm/vcpu_onereg.c
> @@ -42,6 +42,7 @@ static const unsigned long kvm_isa_ext_arr[] = {
> KVM_ISA_EXT_ARR(SVPBMT),
> KVM_ISA_EXT_ARR(ZBA),
> KVM_ISA_EXT_ARR(ZBB),
> + KVM_ISA_EXT_ARR(ZBC),
> KVM_ISA_EXT_ARR(ZBS),
> KVM_ISA_EXT_ARR(ZICBOM),
> KVM_ISA_EXT_ARR(ZICBOZ),
> @@ -92,6 +93,7 @@ static bool kvm_riscv_vcpu_isa_disable_allowed(unsigned long ext)
> case KVM_RISCV_ISA_EXT_SVNAPOT:
> case KVM_RISCV_ISA_EXT_ZBA:
> case KVM_RISCV_ISA_EXT_ZBB:
> + case KVM_RISCV_ISA_EXT_ZBC:
> case KVM_RISCV_ISA_EXT_ZBS:
> case KVM_RISCV_ISA_EXT_ZICNTR:
> case KVM_RISCV_ISA_EXT_ZICOND:
> --
> 2.34.1
>

Reviewed-by: Andrew Jones <ajones@ventanamicro.com>