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authorBorislav Petkov <bp@suse.de>2014-01-18 12:48:16 +0100
committerMatt Fleming <matt.fleming@intel.com>2014-03-04 16:17:17 +0000
commit42a5477251f0e0f33ad5f6a95c48d685ec03191e (patch)
tree616ed2ed4a076090e2ab494c1b1660b8673fe3e1 /arch/x86/mm
parent11cc851254b4bc3bd4430be8db2a41469303a427 (diff)
downloadop-kernel-dev-42a5477251f0e0f33ad5f6a95c48d685ec03191e.zip
op-kernel-dev-42a5477251f0e0f33ad5f6a95c48d685ec03191e.tar.gz
x86, pageattr: Export page unmapping interface
We will use it in efi so expose it. Signed-off-by: Borislav Petkov <bp@suse.de> Tested-by: Toshi Kani <toshi.kani@hp.com> Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Diffstat (limited to 'arch/x86/mm')
-rw-r--r--arch/x86/mm/pageattr.c44
1 files changed, 31 insertions, 13 deletions
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index b3b19f4..a348868 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -692,6 +692,18 @@ static bool try_to_free_pmd_page(pmd_t *pmd)
return true;
}
+static bool try_to_free_pud_page(pud_t *pud)
+{
+ int i;
+
+ for (i = 0; i < PTRS_PER_PUD; i++)
+ if (!pud_none(pud[i]))
+ return false;
+
+ free_page((unsigned long)pud);
+ return true;
+}
+
static bool unmap_pte_range(pmd_t *pmd, unsigned long start, unsigned long end)
{
pte_t *pte = pte_offset_kernel(pmd, start);
@@ -805,6 +817,16 @@ static void unmap_pud_range(pgd_t *pgd, unsigned long start, unsigned long end)
*/
}
+static void unmap_pgd_range(pgd_t *root, unsigned long addr, unsigned long end)
+{
+ pgd_t *pgd_entry = root + pgd_index(addr);
+
+ unmap_pud_range(pgd_entry, addr, end);
+
+ if (try_to_free_pud_page((pud_t *)pgd_page_vaddr(*pgd_entry)))
+ pgd_clear(pgd_entry);
+}
+
static int alloc_pte_page(pmd_t *pmd)
{
pte_t *pte = (pte_t *)get_zeroed_page(GFP_KERNEL | __GFP_NOTRACK);
@@ -999,9 +1021,8 @@ static int populate_pud(struct cpa_data *cpa, unsigned long start, pgd_t *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 */
+ pgd_t *pgd_entry;
int ret;
pgd_entry = cpa->pgd + pgd_index(addr);
@@ -1015,7 +1036,6 @@ static int populate_pgd(struct cpa_data *cpa, unsigned long addr)
return -1;
set_pgd(pgd_entry, __pgd(__pa(pud) | _KERNPG_TABLE));
- allocd_pgd = true;
}
pgprot_val(pgprot) &= ~pgprot_val(cpa->mask_clr);
@@ -1023,19 +1043,11 @@ static int populate_pgd(struct cpa_data *cpa, unsigned long addr)
ret = populate_pud(cpa, addr, pgd_entry, pgprot);
if (ret < 0) {
- unmap_pud_range(pgd_entry, addr,
+ unmap_pgd_range(cpa->pgd, addr,
addr + (cpa->numpages << PAGE_SHIFT));
-
- if (allocd_pgd) {
- /*
- * If I allocated this PUD page, I can just as well
- * free it in this error path.
- */
- pgd_clear(pgd_entry);
- free_page((unsigned long)pud);
- }
return ret;
}
+
cpa->numpages = ret;
return 0;
}
@@ -1861,6 +1873,12 @@ out:
return retval;
}
+void kernel_unmap_pages_in_pgd(pgd_t *root, unsigned long address,
+ unsigned numpages)
+{
+ unmap_pgd_range(root, address, address + (numpages << PAGE_SHIFT));
+}
+
/*
* The testcases use internal knowledge of the implementation that shouldn't
* be exposed to the rest of the kernel. Include these directly here.
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