On Tue, 2018-08-14 at 19:18 +0200, Greg Kroah-Hartman wrote:
> 4.4-stable review patch. If anyone has any objections, please let me know.
>
> ------------------
>
> From: Andi Kleen <ak@xxxxxxxxxxxxxxx>
>
> commit 958f79b9ee55dfaf00c8106ed1c22a2919e0028b upstream
[...]
> --- a/arch/x86/include/asm/pgtable.h
> +++ b/arch/x86/include/asm/pgtable.h
> @@ -378,12 +378,39 @@ static inline pmd_t pfn_pmd(unsigned lon
> > return __pmd(pfn | massage_pgprot(pgprot));
> }
>
> +static inline pud_t pfn_pud(unsigned long page_nr, pgprot_t pgprot)
> +{
> + phys_addr_t pfn = page_nr << PAGE_SHIFT;
> + pfn ^= protnone_mask(pgprot_val(pgprot));
> + pfn &= PHYSICAL_PUD_PAGE_MASK;
> + return __pud(pfn | massage_pgprot(pgprot));
> +}
[...]
This (and the backport to 4.9) are missing the fix from commit
e14d7dfb41f5 "x86/speculation/l1tf: Fix up pte->pfn conversion for
PAE", as that was applied earlier in the series. But since PAE implies
only 3-level paging I don't know how the PUD functions get used or
whether this actually matters.
Ben.
--
Ben Hutchings, Software Developer Codethink Ltd
https://www.codethink.co.uk/ Dale House, 35 Dale Street
Manchester, M1 2HF, United Kingdom
