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x86/mm/pat: Make set_memory_np() L1TF safe 

set_memory_np() is used to mark kernel mappings not present, but it has
it's own open coded mechanism which does not have the L1TF protection of
inverting the address bits.

Replace the open coded PTE manipulation with the L1TF protecting low level
PTE routines.

Passes the CPA self test.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
hifive-unleashed-5.1
Andi Kleen 2018-08-07 15:09:39 -07:00 committed by Thomas Gleixner
parent 0768f91530
commit 958f79b9ee
1 changed files with 4 additions and 4 deletions
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8
arch/x86/mm/pageattr.c
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@ -1014,8 +1014,8 @@ static long populate_pmd(struct cpa_data *cpa,
pmd = pmd_offset(pud, start);
set_pmd(pmd, __pmd(cpa->pfn << PAGE_SHIFT | _PAGE_PSE |
massage_pgprot(pmd_pgprot)));
set_pmd(pmd, pmd_mkhuge(pfn_pmd(cpa->pfn,
canon_pgprot(pmd_pgprot))));
start += PMD_SIZE;
cpa->pfn += PMD_SIZE >> PAGE_SHIFT;
@ -1087,8 +1087,8 @@ static int populate_pud(struct cpa_data *cpa, unsigned long start, p4d_t *p4d,
* Map everything starting from the Gb boundary, possibly with 1G pages
*/
while (boot_cpu_has(X86_FEATURE_GBPAGES) && end - start >= PUD_SIZE) {
set_pud(pud, __pud(cpa->pfn << PAGE_SHIFT | _PAGE_PSE |
massage_pgprot(pud_pgprot)));
set_pud(pud, pud_mkhuge(pfn_pud(cpa->pfn,
canon_pgprot(pud_pgprot))));
start += PUD_SIZE;
cpa->pfn += PUD_SIZE >> PAGE_SHIFT;