Re: [Xen-devel] [PATCH 2/5] xen: arm: Enable 40 bit addressing in VTCR for arm64

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 10/07/2013 12:38 PM, Ian Campbell wrote:
> This requires setting the v8 specific VTCR_EL2.PS field. These bits are
> UNK/SBZP on v7.
>
> Also the TS0SZ field is described slightly differently for v8, so update the
> comment to reflect this.
>
> Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Acked-by: Julien Grall <julien.grall@xxxxxxxxxx>
> ---
>   xen/arch/arm/mm.c |   11 +++++++++--
>   1 file changed, 9 insertions(+), 2 deletions(-)
>
> diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
> index 0b53200..e48d473 100644
> --- a/xen/arch/arm/mm.c
> +++ b/xen/arch/arm/mm.c
> @@ -386,9 +386,16 @@ void __cpuinit setup_virt_paging(void)
>       /* Setup Stage 2 address translation */
>       /* SH0=00, ORGN0=IRGN0=01
>        * SL0=01 (Level-1)
> -     * T0SZ=(1)1000 = -8 (40 bit physical addresses)
> +     * ARVv7: T0SZ=(1)1000 = -8 (32-(-8) = 40 bit physical addresses)
> +     * ARMv8: T0SZ=01 1000 = 24 (64-24   = 40 bit physical addresses)
> +     *        PS=010 == 40 bits
>        */
> -    WRITE_SYSREG32(0x80002558, VTCR_EL2); isb();
> +#ifdef CONFIG_ARM_32
> +    WRITE_SYSREG32(0x80002558, VTCR_EL2);
> +#else
> +    WRITE_SYSREG32(0x80022558, VTCR_EL2);
> +#endif
> +    isb();
>   }
>
>   static inline lpae_t pte_of_xenaddr(vaddr_t va)
--
Julien Grall

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