On 14/11/2014 10:31, Tiejun Chen wrote:
> In some real scenarios 'start' may not be less than 'end' like
> maxphyaddr = 52.
>
> Signed-off-by: Tiejun Chen <tiejun.chen@xxxxxxxxx>
> ---
> arch/x86/kvm/mmu.h | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/arch/x86/kvm/mmu.h b/arch/x86/kvm/mmu.h
> index bde8ee7..0e98b5e 100644
> --- a/arch/x86/kvm/mmu.h
> +++ b/arch/x86/kvm/mmu.h
> @@ -58,6 +58,8 @@
>
> static inline u64 rsvd_bits(int s, int e)
> {
> + if (unlikely(s > e))
> + return 0;
> return ((1ULL << (e - s + 1)) - 1) << s;
> }
>
>
s == e + 1 is supported:
(1ULL << (e - (e + 1) + 1)) - 1) << s ==
(1ULL << 0) << s ==
0
Is there any case where s is even bigger?
Paolo
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