Re: [Xen-devel] [RFC 02/14] xen/arm: Remove the parameter "attrindx" in copy_paddr

[Julien Grall <julien.grall@xxxxxxxxxx>]

Hi Ian,

On 03/14/2014 05:14 PM, Ian Campbell wrote:
> On Wed, 2014-03-12 at 16:15 +0000, Julien Grall wrote:
>> copy_addr
> 
> s/copy_p?addr/copy_from_paddr/ throughout the subject and changelog.

Right. I will fix it in the next series.

>>  is only used with BUFFERABLE, there is some place where DEV_SHARED
>> was used by mistake.
> 
> A hangover from flash support or something else?

I guess, DEV_SHARED was using in few place mainly when Xen is loading a
small amount of data. Even before this patch, info->load_attr should
have been used.

Do you think I need to send a patch for Xen 4.4?

>> The parameter "attrindx" can be safely remove and let copy_paddr to map
>> every page with BUFFERABLE attribute.
> 
> What about if e.g. the firmware provides a dtb which is in flash or
> where the kernel/initrd which it references are in flash. There's
> nothing inherently wrong with that is there? Maybe BUFFERABLE is still
> appropriate there for r/o use.

Even before this patch, Xen was using BUFFERABLE when the kernel/initrd
is described in the device tree. I don't think it's easily possible to
know if the range belongs to the RAM or not. Maybe we can use UNCACHE in
this context?

Regards,

-- 
Julien Grall

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