Re: [PATCH 06/11] x86/virt/guest/xen: Remove use of pgd_list from the Xen guest code

From: Ingo Molnar
Date: Tue Sep 29 2015 - 04:45:35 EST

* Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:

> On Mon, Sep 21, 2015 at 11:23 PM, Ingo Molnar <mingo@xxxxxxxxxx> wrote:
> > xen_mm_pin_all()/unpin_all() are used to implement full guest instance
> > suspend/restore. It's a stop-all method that needs to iterate through
> > all allocated pgds in the system to fix them up for Xen's use.
> And _this_ is why I'd reall ylike that "for_each_mm()" helper.
> Yeah, yeah, maybe it would require syntax like
> for_each_mm (tsk, mm) {
> ...
> } end_for_each_mm(mm);
> to do variable allocation things or cleanups (ie "end_for_each_mm()" might drop
> the task lock etc), but wouldn't that still be better than this complex
> boilerplate thing?

Yeah, agreed absolutely.


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