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x86/mm/pageattr: Add a PGD pagetable populating function 

This allocates, if necessary, and populates the corresponding PGD entry
with a PUD page. The next population level is a dummy macro which will
be removed by the next patch and it is added here to keep the patch
small and easily reviewable but not break bisection, at the same time.

Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
This commit is contained in:
Borislav Petkov 2013-10-31 17:25:01 +01:00 committed by Matt Fleming
parent 0fd64c23fd
commit f3f729661e
1 changed files with 39 additions and 0 deletions
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39
arch/x86/mm/pageattr.c
View File

@ -666,6 +666,45 @@ static int split_large_page(pte_t *kpte, unsigned long address)
return 0;
}
#define populate_pud(cpa, addr, pgd, pgprot) (-1)
/*
* Restrictions for kernel page table do not necessarily apply when mapping in
* an alternate PGD.
*/
static int populate_pgd(struct cpa_data *cpa, unsigned long addr)
{
pgprot_t pgprot = __pgprot(_KERNPG_TABLE);
bool allocd_pgd = false;
pgd_t *pgd_entry;
pud_t *pud = NULL; /* shut up gcc */
int ret;
pgd_entry = cpa->pgd + pgd_index(addr);
/*
* Allocate a PUD page and hand it down for mapping.
*/
if (pgd_none(*pgd_entry)) {
pud = (pud_t *)get_zeroed_page(GFP_KERNEL | __GFP_NOTRACK);
if (!pud)
return -1;
set_pgd(pgd_entry, __pgd(__pa(pud) | _KERNPG_TABLE));
allocd_pgd = true;
}
pgprot_val(pgprot) &= ~pgprot_val(cpa->mask_clr);
pgprot_val(pgprot) |= pgprot_val(cpa->mask_set);
ret = populate_pud(cpa, addr, pgd_entry, pgprot);
if (ret < 0)
return ret;
cpa->numpages = ret;
return 0;
}
static int __cpa_process_fault(struct cpa_data *cpa, unsigned long vaddr,
int primary)
{