On 05.09.2012, at 09:58, Rusty Russell wrote:
> Useful helper for getting length of register given id.
>
> Signed-off-by: Rusty Russell <rusty.russell@xxxxxxxxxx>
Acked-by: Alexander Graf <agraf@xxxxxxx>
Alex
> ---
> include/linux/kvm.h | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/include/linux/kvm.h b/include/linux/kvm.h
> index d808694..8c3760e 100644
> --- a/include/linux/kvm.h
> +++ b/include/linux/kvm.h
> @@ -744,6 +744,8 @@ struct kvm_dirty_tlb {
> #define KVM_REG_SIZE_U256 0x0050000000000000ULL
> #define KVM_REG_SIZE_U512 0x0060000000000000ULL
> #define KVM_REG_SIZE_U1024 0x0070000000000000ULL
> +#define KVM_REG_SIZE(id) \
> + (1U << (((id) & KVM_REG_SIZE_MASK) >> KVM_REG_SIZE_SHIFT))
>
> struct kvm_one_reg {
> __u64 id;
> --
> 1.7.9.5
>
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