Re: [PATCH 4/5] RISC-V: KVM: Allow Zacas extension for Guest/VM

Andrew Jones
2024-02-28T13:10:16Z

On Wed, Feb 14, 2024 at 06:07:56PM +0530, Anup Patel wrote:
> We extend the KVM ISA extension ONE_REG interface to allow KVM
> user space to detect and enable Zacas 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 f8aa9f2ace95..37fb0f70b3e5 100644
> --- a/arch/riscv/include/uapi/asm/kvm.h
> +++ b/arch/riscv/include/uapi/asm/kvm.h
> @@ -167,6 +167,7 @@ enum KVM_RISCV_ISA_EXT_ID {
> KVM_RISCV_ISA_EXT_ZVFHMIN,
> KVM_RISCV_ISA_EXT_ZFA,
> KVM_RISCV_ISA_EXT_ZTSO,
> + KVM_RISCV_ISA_EXT_ZACAS,
> KVM_RISCV_ISA_EXT_MAX,
> };
>
> diff --git a/arch/riscv/kvm/vcpu_onereg.c b/arch/riscv/kvm/vcpu_onereg.c
> index 38f5cf286087..f4a6124d25c9 100644
> --- a/arch/riscv/kvm/vcpu_onereg.c
> +++ b/arch/riscv/kvm/vcpu_onereg.c
> @@ -40,6 +40,7 @@ static const unsigned long kvm_isa_ext_arr[] = {
> KVM_ISA_EXT_ARR(SVINVAL),
> KVM_ISA_EXT_ARR(SVNAPOT),
> KVM_ISA_EXT_ARR(SVPBMT),
> + KVM_ISA_EXT_ARR(ZACAS),
> KVM_ISA_EXT_ARR(ZBA),
> KVM_ISA_EXT_ARR(ZBB),
> KVM_ISA_EXT_ARR(ZBC),
> @@ -118,6 +119,7 @@ static bool kvm_riscv_vcpu_isa_disable_allowed(unsigned long ext)
> case KVM_RISCV_ISA_EXT_SSTC:
> case KVM_RISCV_ISA_EXT_SVINVAL:
> case KVM_RISCV_ISA_EXT_SVNAPOT:
> + case KVM_RISCV_ISA_EXT_ZACAS:
> case KVM_RISCV_ISA_EXT_ZBA:
> case KVM_RISCV_ISA_EXT_ZBB:
> case KVM_RISCV_ISA_EXT_ZBC:
> --
> 2.34.1
>

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