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From: Julien Grall <julien.grall@arm.com>
To: "Edgar E. Iglesias" <edgar.iglesias@gmail.com>, xen-devel@lists.xen.org
Cc: edgar.iglesias@xilinx.com, sstabellini@kernel.org
Subject: Re: [RFC for-4.8 v2 1/7] xen/arm: Add MATTR_MEM_NC for normal non-cacheable memory
Date: Mon, 6 Jun 2016 18:23:47 +0100	[thread overview]
Message-ID: <5755B1A3.1030901@arm.com> (raw)
In-Reply-To: <1464960552-6645-2-git-send-email-edgar.iglesias@gmail.com>

Hi Edgar,

On 03/06/16 14:29, Edgar E. Iglesias wrote:
> From: "Edgar E. Iglesias" <edgar.iglesias@xilinx.com>
>
> Add the MATTR_MEM_NC macro describing normal non-cacheable memory.
>
> Signed-off-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
> ---
>   xen/arch/arm/p2m.c         | 1 +
>   xen/include/asm-arm/page.h | 1 +
>   2 files changed, 2 insertions(+)
>
> diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c
> index 838d004..0f1e1b1 100644
> --- a/xen/arch/arm/p2m.c
> +++ b/xen/arch/arm/p2m.c
> @@ -343,6 +343,7 @@ static lpae_t mfn_to_p2m_entry(unsigned long mfn, unsigned int mattr,
>           e.p2m.sh = LPAE_SH_INNER;
>           break;
>
> +    case MATTR_MEM_NC:

I would add a comment here to explain why non-cacheable memory should 
always be outer-shareable (see DDI 0406C.b B3-1376 to 1377).

For ideas on what to write, see mfn_to_xen_entry in include/asm-arm/page.h

>       case MATTR_DEV:
>           e.p2m.sh = LPAE_SH_OUTER;
>           break;
> diff --git a/xen/include/asm-arm/page.h b/xen/include/asm-arm/page.h
> index a94e978..45d2e2c 100644
> --- a/xen/include/asm-arm/page.h
> +++ b/xen/include/asm-arm/page.h
> @@ -73,6 +73,7 @@
>    *
>    */
>   #define MATTR_DEV     0x1
> +#define MATTR_MEM_NC  0x5
>   #define MATTR_MEM     0xf
>
>   /* Flags for get_page_from_gva, gvirt_to_maddr etc */
>

Regards,

-- 
Julien Grall

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  reply	other threads:[~2016-06-06 17:23 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-03 13:29 [RFC for-4.8 v2 0/7] xen/arm: Add support for mapping mmio-sram nodes into dom0 Edgar E. Iglesias
2016-06-03 13:29 ` [RFC for-4.8 v2 1/7] xen/arm: Add MATTR_MEM_NC for normal non-cacheable memory Edgar E. Iglesias
2016-06-06 17:23   ` Julien Grall [this message]
2016-06-07 20:34     ` Edgar E. Iglesias
2016-06-03 13:29 ` [RFC for-4.8 v2 2/7] xen/arm: Rename and generalize un/map_regions_rw_cache Edgar E. Iglesias
2016-06-06 17:55   ` Julien Grall
2016-06-07 20:55     ` Edgar E. Iglesias
2016-06-03 13:29 ` [RFC for-4.8 v2 3/7] xen/device-tree: Add __DT_MATCH macros without braces Edgar E. Iglesias
2016-06-06 17:36   ` Julien Grall
2016-06-03 13:29 ` [RFC for-4.8 v2 4/7] xen/device-tree: Make dt_match_node match props Edgar E. Iglesias
2016-06-06 17:39   ` Julien Grall
2016-06-07 20:43     ` Edgar E. Iglesias
2016-06-08  8:44       ` Julien Grall
2016-06-09 16:04         ` Edgar E. Iglesias
2016-06-09 16:23           ` Julien Grall
2016-06-09 16:30             ` Edgar E. Iglesias
2016-06-03 13:29 ` [RFC for-4.8 v2 5/7] xen/arm: domain_build: Plumb for different mapping attributes Edgar E. Iglesias
2016-06-06 18:00   ` Julien Grall
2016-06-03 13:29 ` [RFC for-4.8 v2 6/7] xen/device-tree: Add an mmio-sram bus Edgar E. Iglesias
2016-06-06 18:05   ` Julien Grall
2016-06-08  0:21     ` Edgar E. Iglesias
2016-06-08  8:52       ` Julien Grall
2016-06-03 13:29 ` [RFC for-4.8 v2 7/7] xen/arm: Map mmio-sram nodes as normal un-cached rwx memory Edgar E. Iglesias
2016-06-06 18:08   ` Julien Grall

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