diff --git a/sys/amd64/amd64/pmap.c b/sys/amd64/amd64/pmap.c
--- a/sys/amd64/amd64/pmap.c
+++ b/sys/amd64/amd64/pmap.c
@@ -5100,7 +5100,7 @@
 		pde = pmap_pdpe_to_pde(pdpe, va);
 		if ((*pde & X86_PG_V) != 0)
 			panic("Unexpected pde");
-		pa = vm_phys_early_alloc(NBPDR, domain);
+		vm_phys_early_alloc_ex(NBPDR, NBPDR, -1, domain, 0, &pa);
 		for (i = 0; i < NPDEPG; i++)
 			dump_add_page(pa + i * PAGE_SIZE);
 		newpdir = (pd_entry_t)(pa | X86_PG_V | X86_PG_RW | X86_PG_A |
diff --git a/sys/powerpc/aim/mmu_oea64.c b/sys/powerpc/aim/mmu_oea64.c
--- a/sys/powerpc/aim/mmu_oea64.c
+++ b/sys/powerpc/aim/mmu_oea64.c
@@ -3484,7 +3484,8 @@
 		size = round_page(size * sizeof(struct vm_page));
 		needed = size;
 		size = roundup2(size, moea64_large_page_size);
-		pa = vm_phys_early_alloc(size, i);
+		vm_phys_early_alloc_ex(size, moea64_large_page_size, -1, i, 0,
+		    &pa);
 		vm_page_array_size += size / sizeof(struct vm_page);
 		moea64_map_range(va, pa, size >> PAGE_SHIFT);
 		/* Scoot up domain 0, to reduce the domain page overlap. */
diff --git a/sys/powerpc/aim/mmu_radix.c b/sys/powerpc/aim/mmu_radix.c
--- a/sys/powerpc/aim/mmu_radix.c
+++ b/sys/powerpc/aim/mmu_radix.c
@@ -6456,7 +6456,8 @@
 		pde = pmap_l2e_to_l3e(l2e, va);
 		if ((be64toh(*pde) & PG_V) != 0)
 			panic("Unexpected pde %p", pde);
-		pa = vm_phys_early_alloc(L3_PAGE_SIZE, domain);
+		vm_phys_early_alloc_ex(L3_PAGE_SIZE, L3_PAGE_SIZE, 0, domain,
+		    0, &pa);
 		for (i = 0; i < NPDEPG; i++)
 			dump_add_page(pa + i * PAGE_SIZE);
 		newl3 = (pml3_entry_t)(pa | RPTE_EAA_P | RPTE_EAA_R | RPTE_EAA_W);
diff --git a/sys/vm/vm_phys.c b/sys/vm/vm_phys.c
--- a/sys/vm/vm_phys.c
+++ b/sys/vm/vm_phys.c
@@ -2362,6 +2362,10 @@
  *
  * Can't request a specific alignment, chunk, nor pass flags.  In particular, it
  * will panic on failure.
+ *
+ * CAUTION: Contrary to the previous vm_phys_early_alloc() implementation, it
+ * only aligns the requested memory on PAGE_SIZE, regardless of 'alloc_size'.
+ * If a greater alignment is needed, use vm_phys_early_alloc_ex() instead.
  */
 vm_paddr_t
 vm_phys_early_alloc(size_t alloc_size, int domain)
@@ -2369,7 +2373,7 @@
 	vm_paddr_t res;
 
 	/* This call will panic() on error. */
-	vm_phys_early_alloc_ex(alloc_size, alloc_size, -1, domain, 0, &res);
+	vm_phys_early_alloc_ex(alloc_size, PAGE_SIZE, -1, domain, 0, &res);
 	return (res);
 }