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Diffstat (limited to 'arch/x86/mm/pageattr.c')
-rw-r--r--arch/x86/mm/pageattr.c88
1 files changed, 56 insertions, 32 deletions
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index 2c44c0792301..a3137a4feed1 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -414,18 +414,28 @@ pmd_t *lookup_pmd_address(unsigned long address)
phys_addr_t slow_virt_to_phys(void *__virt_addr)
{
unsigned long virt_addr = (unsigned long)__virt_addr;
- phys_addr_t phys_addr;
- unsigned long offset;
+ unsigned long phys_addr, offset;
enum pg_level level;
- unsigned long pmask;
pte_t *pte;
pte = lookup_address(virt_addr, &level);
BUG_ON(!pte);
- pmask = page_level_mask(level);
- offset = virt_addr & ~pmask;
- phys_addr = (phys_addr_t)pte_pfn(*pte) << PAGE_SHIFT;
- return (phys_addr | offset);
+
+ switch (level) {
+ case PG_LEVEL_1G:
+ phys_addr = pud_pfn(*(pud_t *)pte) << PAGE_SHIFT;
+ offset = virt_addr & ~PUD_PAGE_MASK;
+ break;
+ case PG_LEVEL_2M:
+ phys_addr = pmd_pfn(*(pmd_t *)pte) << PAGE_SHIFT;
+ offset = virt_addr & ~PMD_PAGE_MASK;
+ break;
+ default:
+ phys_addr = pte_pfn(*pte) << PAGE_SHIFT;
+ offset = virt_addr & ~PAGE_MASK;
+ }
+
+ return (phys_addr_t)(phys_addr | offset);
}
EXPORT_SYMBOL_GPL(slow_virt_to_phys);
@@ -458,7 +468,7 @@ static int
try_preserve_large_page(pte_t *kpte, unsigned long address,
struct cpa_data *cpa)
{
- unsigned long nextpage_addr, numpages, pmask, psize, addr, pfn;
+ unsigned long nextpage_addr, numpages, pmask, psize, addr, pfn, old_pfn;
pte_t new_pte, old_pte, *tmp;
pgprot_t old_prot, new_prot, req_prot;
int i, do_split = 1;
@@ -478,17 +488,21 @@ try_preserve_large_page(pte_t *kpte, unsigned long address,
switch (level) {
case PG_LEVEL_2M:
-#ifdef CONFIG_X86_64
+ old_prot = pmd_pgprot(*(pmd_t *)kpte);
+ old_pfn = pmd_pfn(*(pmd_t *)kpte);
+ break;
case PG_LEVEL_1G:
-#endif
- psize = page_level_size(level);
- pmask = page_level_mask(level);
+ old_prot = pud_pgprot(*(pud_t *)kpte);
+ old_pfn = pud_pfn(*(pud_t *)kpte);
break;
default:
do_split = -EINVAL;
goto out_unlock;
}
+ psize = page_level_size(level);
+ pmask = page_level_mask(level);
+
/*
* Calculate the number of pages, which fit into this large
* page starting at address:
@@ -504,7 +518,7 @@ try_preserve_large_page(pte_t *kpte, unsigned long address,
* up accordingly.
*/
old_pte = *kpte;
- old_prot = req_prot = pgprot_large_2_4k(pte_pgprot(old_pte));
+ req_prot = pgprot_large_2_4k(old_prot);
pgprot_val(req_prot) &= ~pgprot_val(cpa->mask_clr);
pgprot_val(req_prot) |= pgprot_val(cpa->mask_set);
@@ -530,10 +544,10 @@ try_preserve_large_page(pte_t *kpte, unsigned long address,
req_prot = canon_pgprot(req_prot);
/*
- * old_pte points to the large page base address. So we need
+ * old_pfn points to the large page base pfn. So we need
* to add the offset of the virtual address:
*/
- pfn = pte_pfn(old_pte) + ((address & (psize - 1)) >> PAGE_SHIFT);
+ pfn = old_pfn + ((address & (psize - 1)) >> PAGE_SHIFT);
cpa->pfn = pfn;
new_prot = static_protections(req_prot, address, pfn);
@@ -544,7 +558,7 @@ try_preserve_large_page(pte_t *kpte, unsigned long address,
* the pages in the range we try to preserve:
*/
addr = address & pmask;
- pfn = pte_pfn(old_pte);
+ pfn = old_pfn;
for (i = 0; i < (psize >> PAGE_SHIFT); i++, addr += PAGE_SIZE, pfn++) {
pgprot_t chk_prot = static_protections(req_prot, addr, pfn);
@@ -574,7 +588,7 @@ 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), new_prot);
+ new_pte = pfn_pte(old_pfn, new_prot);
__set_pmd_pte(kpte, address, new_pte);
cpa->flags |= CPA_FLUSHTLB;
do_split = 0;
@@ -591,7 +605,7 @@ __split_large_page(struct cpa_data *cpa, pte_t *kpte, unsigned long address,
struct page *base)
{
pte_t *pbase = (pte_t *)page_address(base);
- unsigned long pfn, pfninc = 1;
+ unsigned long ref_pfn, pfn, pfninc = 1;
unsigned int i, level;
pte_t *tmp;
pgprot_t ref_prot;
@@ -608,26 +622,33 @@ __split_large_page(struct cpa_data *cpa, pte_t *kpte, unsigned long address,
}
paravirt_alloc_pte(&init_mm, page_to_pfn(base));
- ref_prot = pte_pgprot(pte_clrhuge(*kpte));
- /* promote PAT bit to correct position */
- if (level == PG_LEVEL_2M)
+ switch (level) {
+ case PG_LEVEL_2M:
+ ref_prot = pmd_pgprot(*(pmd_t *)kpte);
+ /* clear PSE and promote PAT bit to correct position */
ref_prot = pgprot_large_2_4k(ref_prot);
+ ref_pfn = pmd_pfn(*(pmd_t *)kpte);
+ break;
-#ifdef CONFIG_X86_64
- if (level == PG_LEVEL_1G) {
+ case PG_LEVEL_1G:
+ ref_prot = pud_pgprot(*(pud_t *)kpte);
+ ref_pfn = pud_pfn(*(pud_t *)kpte);
pfninc = PMD_PAGE_SIZE >> PAGE_SHIFT;
+
/*
- * Set the PSE flags only if the PRESENT flag is set
+ * Clear the PSE flags if the PRESENT flag is not 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
+ if (!(pgprot_val(ref_prot) & _PAGE_PRESENT))
pgprot_val(ref_prot) &= ~_PAGE_PSE;
+ break;
+
+ default:
+ spin_unlock(&pgd_lock);
+ return 1;
}
-#endif
/*
* Set the GLOBAL flags only if the PRESENT flag is set
@@ -643,13 +664,16 @@ __split_large_page(struct cpa_data *cpa, pte_t *kpte, unsigned long address,
/*
* Get the target pfn from the original entry:
*/
- pfn = pte_pfn(*kpte);
+ pfn = ref_pfn;
for (i = 0; i < PTRS_PER_PTE; i++, pfn += pfninc)
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))
- split_page_count(level);
+ if (virt_addr_valid(address)) {
+ unsigned long pfn = PFN_DOWN(__pa(address));
+
+ if (pfn_range_is_mapped(pfn, pfn + 1))
+ split_page_count(level);
+ }
/*
* Install the new, split up pagetable.