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Diffstat (limited to 'arch/um/kernel/tlb.c')
-rw-r--r--arch/um/kernel/tlb.c56
1 files changed, 50 insertions, 6 deletions
diff --git a/arch/um/kernel/tlb.c b/arch/um/kernel/tlb.c
index 8425a22142b7..80a358c6d652 100644
--- a/arch/um/kernel/tlb.c
+++ b/arch/um/kernel/tlb.c
@@ -277,7 +277,7 @@ static inline int update_pmd_range(pud_t *pud, unsigned long addr,
return ret;
}
-static inline int update_pud_range(pgd_t *pgd, unsigned long addr,
+static inline int update_pud_range(p4d_t *p4d, unsigned long addr,
unsigned long end,
struct host_vm_change *hvc)
{
@@ -285,7 +285,7 @@ static inline int update_pud_range(pgd_t *pgd, unsigned long addr,
unsigned long next;
int ret = 0;
- pud = pud_offset(pgd, addr);
+ pud = pud_offset(p4d, addr);
do {
next = pud_addr_end(addr, end);
if (!pud_present(*pud)) {
@@ -299,6 +299,28 @@ static inline int update_pud_range(pgd_t *pgd, unsigned long addr,
return ret;
}
+static inline int update_p4d_range(pgd_t *pgd, unsigned long addr,
+ unsigned long end,
+ struct host_vm_change *hvc)
+{
+ p4d_t *p4d;
+ unsigned long next;
+ int ret = 0;
+
+ p4d = p4d_offset(pgd, addr);
+ do {
+ next = p4d_addr_end(addr, end);
+ if (!p4d_present(*p4d)) {
+ if (hvc->force || p4d_newpage(*p4d)) {
+ ret = add_munmap(addr, next - addr, hvc);
+ p4d_mkuptodate(*p4d);
+ }
+ } else
+ ret = update_pud_range(p4d, addr, next, hvc);
+ } while (p4d++, addr = next, ((addr < end) && !ret));
+ return ret;
+}
+
void fix_range_common(struct mm_struct *mm, unsigned long start_addr,
unsigned long end_addr, int force)
{
@@ -316,8 +338,8 @@ void fix_range_common(struct mm_struct *mm, unsigned long start_addr,
ret = add_munmap(addr, next - addr, &hvc);
pgd_mkuptodate(*pgd);
}
- }
- else ret = update_pud_range(pgd, addr, next, &hvc);
+ } else
+ ret = update_p4d_range(pgd, addr, next, &hvc);
} while (pgd++, addr = next, ((addr < end_addr) && !ret));
if (!ret)
@@ -338,6 +360,7 @@ static int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
{
struct mm_struct *mm;
pgd_t *pgd;
+ p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
@@ -364,7 +387,23 @@ static int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
continue;
}
- pud = pud_offset(pgd, addr);
+ p4d = p4d_offset(pgd, addr);
+ if (!p4d_present(*p4d)) {
+ last = ADD_ROUND(addr, P4D_SIZE);
+ if (last > end)
+ last = end;
+ if (p4d_newpage(*p4d)) {
+ updated = 1;
+ err = add_munmap(addr, last - addr, &hvc);
+ if (err < 0)
+ panic("munmap failed, errno = %d\n",
+ -err);
+ }
+ addr = last;
+ continue;
+ }
+
+ pud = pud_offset(p4d, addr);
if (!pud_present(*pud)) {
last = ADD_ROUND(addr, PUD_SIZE);
if (last > end)
@@ -424,6 +463,7 @@ static int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
void flush_tlb_page(struct vm_area_struct *vma, unsigned long address)
{
pgd_t *pgd;
+ p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
@@ -437,7 +477,11 @@ void flush_tlb_page(struct vm_area_struct *vma, unsigned long address)
if (!pgd_present(*pgd))
goto kill;
- pud = pud_offset(pgd, address);
+ p4d = p4d_offset(pgd, address);
+ if (!p4d_present(*p4d))
+ goto kill;
+
+ pud = pud_offset(p4d, address);
if (!pud_present(*pud))
goto kill;