On Fri, Sep 16, 2022 at 12:13:24PM +0530, Mayuresh Chitale wrote:
> The zihintpause extension allows software to use the PAUSE instruction to
> reduce energy consumption while executing spin-wait code sequences. Add the
> zihintpause extension to the device tree if it is supported by the host.
>
> Signed-off-by: Mayuresh Chitale <mchitale@xxxxxxxxxxxxxxxx>
> ---
> riscv/fdt.c | 2 ++
> riscv/include/asm/kvm.h | 1 +
> 2 files changed, 3 insertions(+)
>
> diff --git a/riscv/fdt.c b/riscv/fdt.c
> index e3d7717..7997edc 100644
> --- a/riscv/fdt.c
> +++ b/riscv/fdt.c
> @@ -19,6 +19,8 @@ struct isa_ext_info {
> struct isa_ext_info isa_info_arr[] = {
> {"svpbmt", KVM_RISCV_ISA_EXT_SVPBMT},
> {"sstc", KVM_RISCV_ISA_EXT_SSTC},
> + {"Zihintpause", KVM_RISCV_ISA_EXT_ZIHINTPAUSE},
We don't capitalize the first S in 'Sstc' above, so I don't think we want
to capitalize this Z either.
> +
extra blank line
> };
>
> static void dump_fdt(const char *dtb_file, void *fdt)
> diff --git a/riscv/include/asm/kvm.h b/riscv/include/asm/kvm.h
> index 7351417..f6f7963 100644
> --- a/riscv/include/asm/kvm.h
> +++ b/riscv/include/asm/kvm.h
> @@ -98,6 +98,7 @@ enum KVM_RISCV_ISA_EXT_ID {
> KVM_RISCV_ISA_EXT_M,
> KVM_RISCV_ISA_EXT_SVPBMT,
> KVM_RISCV_ISA_EXT_SSTC,
> + KVM_RISCV_ISA_EXT_ZIHINTPAUSE,
This should be updated with a uapi header update using
util/update_headers.sh
> KVM_RISCV_ISA_EXT_MAX,
> };
>
> --
> 2.34.1
>
Thanks,
drew
