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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 5/7] xen/arm: domain_build: Plumb for different mapping attributes
Date: Mon, 6 Jun 2016 19:00:05 +0100	[thread overview]
Message-ID: <5755BA25.3070702@arm.com> (raw)
In-Reply-To: <1464960552-6645-6-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 plumbing for passing around mapping attributes. This
> is in preparation to allow us to differentiate the attributes
> for specific device nodes.
>
> We still use the same DEVICE mappings for all nodes so this
> patch has no functional change.
>
> Signed-off-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
> ---
>   xen/arch/arm/domain_build.c | 57 +++++++++++++++++++++++++++++++++------------
>   1 file changed, 42 insertions(+), 15 deletions(-)
>
> diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
> index e4fed4b..064feb3 100644
> --- a/xen/arch/arm/domain_build.c
> +++ b/xen/arch/arm/domain_build.c
> @@ -42,6 +42,18 @@ static void __init parse_dom0_mem(const char *s)
>   }
>   custom_param("dom0_mem", parse_dom0_mem);
>
> +struct map_attr
> +{
> +    unsigned int memattr;
> +    p2m_access_t access;

Based on my comment on patch #2, access should not be used for other 
purpose than memaccess. So ...

> +};
> +
> +struct map_range_data
> +{
> +    struct domain *d;
> +    const struct map_attr *attr;

.. this could be replaced by "unsigned int memattr" directly.

> +};
> +
>   //#define DEBUG_DT
>
>   #ifdef DEBUG_DT

[...]

> @@ -1322,6 +1344,11 @@ static int handle_node(struct domain *d, struct kernel_info *kinfo,
>
>   static int prepare_dtb(struct domain *d, struct kernel_info *kinfo)
>   {
> +    const struct map_attr default_attr =
> +    {
> +        .memattr = MATTR_DEV,
> +        .access = d->arch.p2m.default_access,
> +    };

Please add a comment to explain that by default, region are always 
mapped the most restrictive way with device attribute.

>       const void *fdt;
>       int new_size;
>       int ret;
> @@ -1341,7 +1368,7 @@ static int prepare_dtb(struct domain *d, struct kernel_info *kinfo)
>
>       fdt_finish_reservemap(kinfo->fdt);
>
> -    ret = handle_node(d, kinfo, dt_host);
> +    ret = handle_node(d, kinfo, dt_host, &default_attr);
>       if ( ret )
>           goto err;
>
>

Regards,

-- 
Julien Grall

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  reply	other threads:[~2016-06-06 18:00 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
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 [this message]
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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