Re: [Xen-devel] [PATCH] xen: arm: flush TLB on all CPUs when setting or clearing fixmaps

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 01/15/2014 02:05 PM, Ian Campbell wrote:
> On Wed, 2014-01-15 at 13:50 +0000, Julien Grall wrote:
>> On 01/15/2014 09:37 AM, Ian Campbell wrote:
>>> On Tue, 2014-01-14 at 18:55 +0000, Julien Grall wrote:
>>>> On 01/14/2014 04:55 PM, Ian Campbell wrote:
>>>>> These mappings are global and therefore need flushing on all processors. 
>>>>> Add
>>>>> flush_all_xen_data_tlb_range_va which accomplishes this.
>>>>
>>>> Can we make name consistent across every *tlb* function call? On
>>>> flushtlb.h we use *_local for maintenance on the current processor only.
>>>> If the suffix is not present then the maintenance will be done on every
>>>> processor.
>>>
>>> I was trying to avoid a massive renaming of the existing flush_xen_*. I
>>> suppose I should just go ahead and do it.
>>
>> If it's too big for 4.4,
> 
> With my temporary-RM hat on I've struggled with this a few times this
> week -- that is, larger, mostly mechanical, textual changes which come
> about because it is the correct/cleanest thing to do as part of a
> smaller change which on their own would be pretty clear candidates for
> an exception. Chen's change "xen/arm{32, 64}: fix section shift when
> mapping 2MB block in boot page table" is in a similar boat.
> 
> I'm not sure where the balance should lie really.

The "issue" I see is backporting patch from Xen 4.5 to Xen 4.4 will be
less trivial. We will have to think about the function name.

-- 
Julien Grall

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