Re: [PATCH 04/10] arm64: KVM: PTE/PMD S2 XN bit definition

Christoffer Dall
2017-10-16T20:07:57Z

On Mon, Oct 09, 2017 at 04:20:26PM +0100, Marc Zyngier wrote:
> As we're about to make S2 page-tables eXecute Never by default,
> add the required bits for both PMDs and PTEs.
>
> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>

> ---
> arch/arm64/include/asm/pgtable-hwdef.h | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/arch/arm64/include/asm/pgtable-hwdef.h b/arch/arm64/include/asm/pgtable-hwdef.h
> index eb0c2bd90de9..af035331fb09 100644
> --- a/arch/arm64/include/asm/pgtable-hwdef.h
> +++ b/arch/arm64/include/asm/pgtable-hwdef.h
> @@ -177,9 +177,11 @@
> */
> #define PTE_S2_RDONLY (_AT(pteval_t, 1) << 6) /* HAP[2:1] */
> #define PTE_S2_RDWR (_AT(pteval_t, 3) << 6) /* HAP[2:1] */
> +#define PTE_S2_XN (_AT(pteval_t, 2) << 53) /* XN[1:0] */
>
> #define PMD_S2_RDONLY (_AT(pmdval_t, 1) << 6) /* HAP[2:1] */
> #define PMD_S2_RDWR (_AT(pmdval_t, 3) << 6) /* HAP[2:1] */
> +#define PMD_S2_XN (_AT(pmdval_t, 2) << 53) /* XN[1:0] */
>
> /*
> * Memory Attribute override for Stage-2 (MemAttr[3:0])
> --
> 2.14.1
>