Re: [RFC PATCH v2 14/32] x86: mm: Provide support to use memblock when spliting large pages

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On 17/03/2017 11:56, Borislav Petkov wrote:
>> Theoretically or practically?
> In the sense, it needs to be tried first to see how ugly it can get.
> 
>> It only looks at the E820 map, doesn't it?  Why does it have to do
>> anything with percpu memory areas?
> That's irrelevant. What we want to do is take what's in init_mm.pgd and
> modify it. And use the facilities in arch/x86/mm/init_{32,64}.c because
> they already know about early/late pagetable pages allocation and they
> deal with the kernel pagetable anyway.

If it is possible to do it in a fairly hypervisor-independent manner,
I'm all for it.  That is, only by looking at AMD-specified CPUID leaves
and at kernel ELF sections.

Paolo

> And *not* teach pageattr.c about memblock because that can be misused,
> as tglx pointed out on IRC.




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