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Index: sys/amd64/amd64/pmap.c
===================================================================
--- sys/amd64/amd64/pmap.c
+++ sys/amd64/amd64/pmap.c
@@ -1396,10 +1396,12 @@
KPTphys = allocpages(firstaddr, nkpt);
KPDphys = allocpages(firstaddr, nkpdpe);
- /* Fill in the underlying page table pages */
- /* XXX not fully used, underneath 2M pages */
+ /*
+ * Fill in the underlying page table pages. Only used when
+ * PTmap mappings are demoted.
+ */
pt_p = (pt_entry_t *)KPTphys;
- for (i = 0; ptoa(i) < *firstaddr; i++)
+ for (i = 0; ptoa(i) < round_2mpage(*firstaddr); i++)
pt_p[i] = ptoa(i) | X86_PG_V | pg_g | bootaddr_rwx(ptoa(i));
/* Now map the page tables at their location within PTmap */
@@ -4480,6 +4482,51 @@
return (rv);
}
+static void
+pmap_demote_pde_check(pt_entry_t *firstpte __unused, pt_entry_t newpte __unused)
+{
+#ifdef INVARIANTS
+#ifdef DIAGNOSTIC
+ pt_entry_t *xpte, *ypte;
+
+ for (xpte = firstpte; xpte < firstpte + NPTEPG; xpte++) {
+ if ((*xpte & PG_FRAME) != (newpte & PG_FRAME) +
+ ptoa(xpte - firstpte)) {
+ printf("pmap_demote_pde: xpte %zd and newpte map "
+ "different pages %#lx %#lx\n",
+ xpte - firstpte, *xpte, newpte);
+ printf("XX %lx %lx\n", (*xpte & PG_FRAME),
+ (newpte & PG_FRAME) + ptoa(xpte - firstpte));
+ for (ypte = firstpte; ypte < firstpte + NPTEPG; ypte++)
+ printf("%zd %#lx\n", ypte - firstpte, *ypte);
+ panic("firstpte");
+ }
+ }
+#else
+ KASSERT((*firstpte & PG_FRAME) == (newpte & PG_FRAME),
+ ("pmap_demote_pde: firstpte and newpte map different physical"
+ " addresses"));
+#endif
+#endif
+}
+
+static void
+pmap_demote_pde_fail(pmap_t pmap, vm_offset_t va, pd_entry_t *pde,
+ pd_entry_t oldpde, struct rwlock **lockp)
+{
+ struct spglist free;
+ vm_offset_t sva;
+
+ SLIST_INIT(&free);
+ sva = trunc_2mpage(va);
+ pmap_remove_pde(pmap, pde, sva, &free, lockp);
+ if ((oldpde & pmap_global_bit(pmap)) == 0)
+ pmap_invalidate_pde_page(pmap, sva, oldpde);
+ vm_page_free_pages_toq(&free, true);
+ CTR2(KTR_PMAP, "pmap_demote_pde: failure for va %#lx"
+ " in pmap %p", va, pmap);
+}
+
static boolean_t
pmap_demote_pde_locked(pmap_t pmap, pd_entry_t *pde, vm_offset_t va,
struct rwlock **lockp)
@@ -4489,12 +4536,11 @@
pt_entry_t PG_A, PG_G, PG_M, PG_PKU_MASK, PG_RW, PG_V;
vm_paddr_t mptepa;
vm_page_t mpte;
- struct spglist free;
- vm_offset_t sva;
int PG_PTE_CACHE;
+ bool in_kernel;
- PG_G = pmap_global_bit(pmap);
PG_A = pmap_accessed_bit(pmap);
+ PG_G = pmap_global_bit(pmap);
PG_M = pmap_modified_bit(pmap);
PG_RW = pmap_rw_bit(pmap);
PG_V = pmap_valid_bit(pmap);
@@ -4502,14 +4548,22 @@
PG_PKU_MASK = pmap_pku_mask_bit(pmap);
PMAP_LOCK_ASSERT(pmap, MA_OWNED);
+ in_kernel = va >= VM_MAX_KERNEL_ADDRESS;
oldpde = *pde;
KASSERT((oldpde & (PG_PS | PG_V)) == (PG_PS | PG_V),
("pmap_demote_pde: oldpde is missing PG_PS and/or PG_V"));
- if ((oldpde & PG_A) == 0 || (mpte = pmap_remove_pt_page(pmap, va)) ==
- NULL) {
+ if ((oldpde & PG_A) == 0) {
+ pmap_demote_pde_fail(pmap, va, pde, oldpde, lockp);
+ return (FALSE);
+ }
+ mpte = pmap_remove_pt_page(pmap, va);
+ if (mpte == NULL) {
KASSERT((oldpde & PG_W) == 0,
("pmap_demote_pde: page table page for a wired mapping"
" is missing"));
+ KASSERT(!in_kernel || (va >= DMAP_MIN_ADDRESS &&
+ va < DMAP_MAX_ADDRESS),
+ ("pmap_demote_pde: No saved mpte for va %#lx", va));
/*
* Invalidate the 2MB page mapping and return "failure" if the
@@ -4523,22 +4577,17 @@
* is the only part of the kernel address space that must be
* handled here.
*/
- if ((oldpde & PG_A) == 0 || (mpte = vm_page_alloc(NULL,
- pmap_pde_pindex(va), (va >= DMAP_MIN_ADDRESS && va <
- DMAP_MAX_ADDRESS ? VM_ALLOC_INTERRUPT : VM_ALLOC_NORMAL) |
- VM_ALLOC_NOOBJ | VM_ALLOC_WIRED)) == NULL) {
- SLIST_INIT(&free);
- sva = trunc_2mpage(va);
- pmap_remove_pde(pmap, pde, sva, &free, lockp);
- if ((oldpde & PG_G) == 0)
- pmap_invalidate_pde_page(pmap, sva, oldpde);
- vm_page_free_pages_toq(&free, true);
- CTR2(KTR_PMAP, "pmap_demote_pde: failure for va %#lx"
- " in pmap %p", va, pmap);
+ mpte = vm_page_alloc(NULL, pmap_pde_pindex(va),
+ (in_kernel ? VM_ALLOC_INTERRUPT : VM_ALLOC_NORMAL) |
+ VM_ALLOC_NOOBJ | VM_ALLOC_WIRED);
+ if (mpte == NULL) {
+ pmap_demote_pde_fail(pmap, va, pde, oldpde, lockp);
return (FALSE);
}
- if (va < VM_MAXUSER_ADDRESS)
+ if (!in_kernel) {
+ mpte->wire_count = NPTEPG;
pmap_resident_count_inc(pmap, 1);
+ }
}
mptepa = VM_PAGE_TO_PHYS(mpte);
firstpte = (pt_entry_t *)PHYS_TO_DMAP(mptepa);
@@ -4553,13 +4602,9 @@
/*
* If the page table page is new, initialize it.
*/
- if (mpte->wire_count == 1) {
- mpte->wire_count = NPTEPG;
+ if ((oldpde & PG_PROMOTED) == 0)
pmap_fill_ptp(firstpte, newpte);
- }
- KASSERT((*firstpte & PG_FRAME) == (newpte & PG_FRAME),
- ("pmap_demote_pde: firstpte and newpte map different physical"
- " addresses"));
+ pmap_demote_pde_check(firstpte, newpte);
/*
* If the mapping has changed attributes, update the page table
@@ -4594,7 +4639,7 @@
/*
* Invalidate a stale recursive mapping of the page table page.
*/
- if (va >= VM_MAXUSER_ADDRESS)
+ if (in_kernel)
pmap_invalidate_page(pmap, (vm_offset_t)vtopte(va));
/*

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