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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