Re: [RFC 4/4] xen/arm: Remove unnecessary GUEST_GICV3_GICR0_SIZE macro.

[Julien Grall <julien.grall@citrix.com>]

Hi Chen,

On 14/05/15 15:14, Chen Baozi wrote:
> From: Chen Baozi <baozich@gmail.com>
> 
> Signed-off-by: Chen Baozi <baozich@gmail.com>
> ---
>  xen/include/public/arch-arm.h | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/xen/include/public/arch-arm.h b/xen/include/public/arch-arm.h
> index c029e0f..cbcda74 100644
> --- a/xen/include/public/arch-arm.h
> +++ b/xen/include/public/arch-arm.h
> @@ -388,8 +388,7 @@ struct xen_arch_domainconfig {
>  #define GUEST_GICV3_RDIST_STRIDE   0x20000ULL
>  #define GUEST_GICV3_RDIST_REGIONS  1
>  
> -#define GUEST_GICV3_GICR0_BASE     0x03020000ULL    /* vCPU0 - vCPU7 */

The /* vCPU0 - vCPU7 */ was useful. Please update to whatever you will
be use.

> -#define GUEST_GICV3_GICR0_SIZE     0x00100000ULL
> +#define GUEST_GICV3_GICR0_BASE     0x03020000ULL

Please don't drop it. Even if you dropped all the usage, it's necessary
for documentation purpose.

If someone wants to change the guest layout, he will know that the
re-dist region will be this size.

I would also like to keep the BUILD_BUG_ON in vgic-v3 in order to check
if there is enough space reserved in the guest layout for the re-dist
(see your patch #2).

Regards,


-- 
Julien Grall