Re: [Xen-devel] where can I find the 'address translation' code in Xen?

[Minjun Hong <nickeysgo@xxxxxxxxx>]

On Mon, Apr 30, 2018 at 3:44 PM, Petr Tesarik <ptesarik@xxxxxxx> wrote:

Hi Minjun,

On Sun, 29 Apr 2018 19:11:30 +0900
Minjun Hong <nickeysgo@xxxxxxxxx> wrote:

>[...]
> My question is,
>
> 1. Is it sure that the function will be called even though the HW already
> translates the address and populates the TLB entry?

I think you miss the point. The hardware page tables for PV domains
already contain machine addresses. In other words, virtual addresses
get translated directly to machine addresses by the hardware page table
walker.

> 2. I'm just asking, is there any code in Xen that is related to the
> behavior of the 'hardware walker'?

Not sure what you mean. Maybe this question is no longer pertinent
given the explanation above?

HTH,
Petr T

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Thanks for your kind answer, Petr.

In your answer on my first question, I was wondering why the function (guest_walk_tables()) should be called even after the address translation and TLB filling has been completed by the hardware page table walker.

As you mentioned, original goal (address translation) is achieved by the hardware. If so, is its role like bottom half of interrupt?

I want to know this function is always called after the translation by the hardware page walker.

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