On Fri, 21 Nov 2014, Linus Torvalds wrote:
> Here's the simplified end result. Again, this is TOTALLY UNTESTED. I
> compiled it and verified that the code generation looks like what I'd
> have expected, but that's literally it.
>
> static noinline int vmalloc_fault(unsigned long address)
> {
> pgd_t *pgd_dst;
> pgdval_t pgd_entry;
> unsigned index = pgd_index(address);
>
> if (index < KERNEL_PGD_BOUNDARY)
> return -1;
>
> pgd_entry = init_mm.pgd[index].pgd;
> if (!pgd_entry)
> return -1;
>
> pgd_dst = __va(PAGE_MASK & read_cr3());
> pgd_dst += index;
>
> if (pgd_dst->pgd)
> return -1;
>
> ACCESS_ONCE(pgd_dst->pgd) = pgd_entry;
This will break paravirt. set_pgd/set_pmd are paravirt functions.
But I'm fine with breaking it, then you just need to change
CONFIG_PARAVIRT to 'def_bool n'
Thanks,
tglx
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