Re: [Xen-devel] [RFC PATCH 4/4] arm/mem_access: Add software guest-page-table walk

[Tamas K Lengyel <tamas@xxxxxxxxxxxxx>]

On Mon, May 8, 2017 at 2:53 PM, Julien Grall <julien.grall@xxxxxxx> wrote:
>
>
> On 05/08/2017 08:42 PM, Tamas K Lengyel wrote:
>>
>> On Mon, May 8, 2017 at 5:44 AM, Julien Grall <julien.grall@xxxxxxx> wrote:
>> Whether the performance is measurable different is going to be very
>> usecase specific. If the TLBs are already loaded with the translation
>> then the hardware lookup will be a lot faster. Setting up a test-case
>> for this is just a PITA and I don't really see why you are against
>> using the hardware lookup to start with.
>
>
> Well, if you read my e-mail you would have noticed I am not against it. I
> just find a bit pointless to do both and was asking if you did some
> benchmark before taking this decision.
>
> But it sounds like you are not willing to even consider it. Anyway I am not
> going to argue on that. It is not something I really care for now.

It did sound to me like you were pushing for it. I would prefer doing
hardware translation first and only falling back to software when
needed unless we have some good incentive to do otherwise.

Tamas

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