[PATCH v1] RISC-V: KVM: Allow Guest use Zihintpause extension

[Conor.Dooley at microchip.com]

On 16/09/2022 06:46, Mayuresh Chitale wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> We should advertise Zihintpause ISA extension to KVM user-space whenever
> host supports it. This will allow KVM user-space (i.e. QEMU or KVMTOOL)
> to pass on this information to Guest via ISA string.

https://lore.kernel.org/linux-riscv/20220915152933.816459-1-mchitale@ventanamicro.com/

You sent a v1 yesterday, what changed between this "v1" & yesterday's
actual v1?
Thanks,
Conor.

> 
> Signed-off-by: Mayuresh Chitale <mchitale at ventanamicro.com>
> ---
>   arch/riscv/include/uapi/asm/kvm.h | 1 +
>   arch/riscv/kvm/vcpu.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 b6770ee08872..9085b90cf324 100644
> --- a/arch/riscv/include/uapi/asm/kvm.h
> +++ b/arch/riscv/include/uapi/asm/kvm.h
> @@ -99,6 +99,7 @@ enum KVM_RISCV_ISA_EXT_ID {
>          KVM_RISCV_ISA_EXT_SVPBMT,
>          KVM_RISCV_ISA_EXT_SSTC,
>          KVM_RISCV_ISA_EXT_SVINVAL,
> +       KVM_RISCV_ISA_EXT_ZIHINTPAUSE,
>          KVM_RISCV_ISA_EXT_MAX,
>   };
> 
> diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c
> index 901bb5c0cb50..0de0dd22e734 100644
> --- a/arch/riscv/kvm/vcpu.c
> +++ b/arch/riscv/kvm/vcpu.c
> @@ -54,6 +54,7 @@ static const unsigned long kvm_isa_ext_arr[] = {
>          RISCV_ISA_EXT_SVPBMT,
>          RISCV_ISA_EXT_SSTC,
>          RISCV_ISA_EXT_SVINVAL,
> +       RISCV_ISA_EXT_ZIHINTPAUSE,
>   };
> 
>   static unsigned long kvm_riscv_vcpu_base2isa_ext(unsigned long base_ext)
> @@ -89,6 +90,7 @@ static bool kvm_riscv_vcpu_isa_disable_allowed(unsigned long ext)
>          case KVM_RISCV_ISA_EXT_M:
>          case KVM_RISCV_ISA_EXT_SSTC:
>          case KVM_RISCV_ISA_EXT_SVINVAL:
> +       case KVM_RISCV_ISA_EXT_ZIHINTPAUSE:
>                  return false;
>          default:
>                  break;
> --
> 2.34.1
> 
> 
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