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Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull x86 fixes from Ingo Molnar.

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/mm/pageattr: Prevent PSE and GLOABL leftovers to confuse pmd/pte_present and pmd_huge
  Revert "x86, mm: Make spurious_fault check explicitly check explicitly check the PRESENT bit"
  x86/mm/numa: Don't check if node is NUMA_NO_NODE
  x86, efi: Make "noefi" really disable EFI runtime serivces
  x86/apic: Fix parsing of the 'lapic' cmdline option
This commit is contained in:
Linus Torvalds
2013-02-26 19:45:29 -08:00
parent 24e55910e4 a8aed3e075
commit 2003cd90c4
5 changed files with 53 additions and 15 deletions
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50
arch/x86/mm/pageattr.c
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@@ -472,6 +472,19 @@ try_preserve_large_page(pte_t *kpte, unsigned long address,
pgprot_val(req_prot) &= ~pgprot_val(cpa->mask_clr);
pgprot_val(req_prot) |= pgprot_val(cpa->mask_set);
/*
* Set the PSE and GLOBAL flags only if the PRESENT flag is
* set otherwise pmd_present/pmd_huge will return true even on
* a non present pmd. The canon_pgprot will clear _PAGE_GLOBAL
* for the ancient hardware that doesn't support it.
*/
if (pgprot_val(new_prot) & _PAGE_PRESENT)
pgprot_val(new_prot) |= _PAGE_PSE | _PAGE_GLOBAL;
else
pgprot_val(new_prot) &= ~(_PAGE_PSE | _PAGE_GLOBAL);
new_prot = canon_pgprot(new_prot);
/*
* old_pte points to the large page base address. So we need
* to add the offset of the virtual address:
@@ -517,7 +530,7 @@ try_preserve_large_page(pte_t *kpte, unsigned long address,
* The address is aligned and the number of pages
* covers the full page.
*/
new_pte = pfn_pte(pte_pfn(old_pte), canon_pgprot(new_prot));
new_pte = pfn_pte(pte_pfn(old_pte), new_prot);
__set_pmd_pte(kpte, address, new_pte);
cpa->flags |= CPA_FLUSHTLB;
do_split = 0;
@@ -561,16 +574,35 @@ int __split_large_page(pte_t *kpte, unsigned long address, pte_t *pbase)
#ifdef CONFIG_X86_64
if (level == PG_LEVEL_1G) {
pfninc = PMD_PAGE_SIZE >> PAGE_SHIFT;
pgprot_val(ref_prot) |= _PAGE_PSE;
/*
* Set the PSE flags only if the PRESENT flag is set
* otherwise pmd_present/pmd_huge will return true
* even on a non present pmd.
*/
if (pgprot_val(ref_prot) & _PAGE_PRESENT)
pgprot_val(ref_prot) |= _PAGE_PSE;
else
pgprot_val(ref_prot) &= ~_PAGE_PSE;
}
#endif
/*
* Set the GLOBAL flags only if the PRESENT flag is set
* otherwise pmd/pte_present will return true even on a non
* present pmd/pte. The canon_pgprot will clear _PAGE_GLOBAL
* for the ancient hardware that doesn't support it.
*/
if (pgprot_val(ref_prot) & _PAGE_PRESENT)
pgprot_val(ref_prot) |= _PAGE_GLOBAL;
else
pgprot_val(ref_prot) &= ~_PAGE_GLOBAL;
/*
* Get the target pfn from the original entry:
*/
pfn = pte_pfn(*kpte);
for (i = 0; i < PTRS_PER_PTE; i++, pfn += pfninc)
set_pte(&pbase[i], pfn_pte(pfn, ref_prot));
set_pte(&pbase[i], pfn_pte(pfn, canon_pgprot(ref_prot)));
if (pfn_range_is_mapped(PFN_DOWN(__pa(address)),
PFN_DOWN(__pa(address)) + 1))
@@ -684,6 +716,18 @@ repeat:
new_prot = static_protections(new_prot, address, pfn);
/*
* Set the GLOBAL flags only if the PRESENT flag is
* set otherwise pte_present will return true even on
* a non present pte. The canon_pgprot will clear
* _PAGE_GLOBAL for the ancient hardware that doesn't
* support it.
*/
if (pgprot_val(new_prot) & _PAGE_PRESENT)
pgprot_val(new_prot) |= _PAGE_GLOBAL;
else
pgprot_val(new_prot) &= ~_PAGE_GLOBAL;
/*
* We need to keep the pfn from the existing PTE,
* after all we're only going to change it's attributes