diff options
Diffstat (limited to 'sys/amd64/amd64/pmap.c')
| -rw-r--r-- | sys/amd64/amd64/pmap.c | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/sys/amd64/amd64/pmap.c b/sys/amd64/amd64/pmap.c index 22a6c31..a7c879c 100644 --- a/sys/amd64/amd64/pmap.c +++ b/sys/amd64/amd64/pmap.c @@ -4407,6 +4407,12 @@ pmap_enter_pde(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot, lockp)) { SLIST_INIT(&free); if (pmap_unwire_ptp(pmap, va, mpde, &free)) { + /* + * Although "va" is not mapped, paging- + * structure caches could nonetheless have + * entries that refer to the freed page table + * pages. Invalidate those entries. + */ pmap_invalidate_page(pmap, va); pmap_free_zero_pages(&free); } @@ -4584,6 +4590,12 @@ pmap_enter_quick_locked(pmap_t pmap, vm_offset_t va, vm_page_t m, if (mpte != NULL) { SLIST_INIT(&free); if (pmap_unwire_ptp(pmap, va, mpte, &free)) { + /* + * Although "va" is not mapped, paging- + * structure caches could nonetheless have + * entries that refer to the freed page table + * pages. Invalidate those entries. + */ pmap_invalidate_page(pmap, va); pmap_free_zero_pages(&free); } @@ -4967,6 +4979,14 @@ pmap_copy(pmap_t dst_pmap, pmap_t src_pmap, vm_offset_t dst_addr, vm_size_t len, SLIST_INIT(&free); if (pmap_unwire_ptp(dst_pmap, addr, dstmpte, &free)) { + /* + * Although "addr" is not + * mapped, paging-structure + * caches could nonetheless + * have entries that refer to + * the freed page table pages. + * Invalidate those entries. + */ pmap_invalidate_page(dst_pmap, addr); pmap_free_zero_pages(&free); @@ -5219,7 +5239,7 @@ pmap_page_is_mapped(vm_page_t m) * Destroy all managed, non-wired mappings in the given user-space * pmap. This pmap cannot be active on any processor besides the * caller. - * + * * This function cannot be applied to the kernel pmap. Moreover, it * is not intended for general use. It is only to be used during * process termination. Consequently, it can be implemented in ways |
