Ensure pmap_create() waits in case kernel virtual space shortage.

Prevents a panic in pmap_pinit_pd_pae() when applying a lot of memory
pressure and the kernel needs time to recover while swapping.

Reported and fix tested by mvs@, also tested by sthen@

ok mlarkin@, mvs@, kettenis@

diff --git a/sys/arch/i386/i386/pmapae.c b/sys/arch/i386/i386/pmapae.c
index 37e77ec..c88ec8f 100644 (file)
--- a/sys/arch/i386/i386/pmapae.c
+++ b/sys/arch/i386/i386/pmapae.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: pmapae.c,v 1.71 2023/05/30 08:30:01 jsg Exp $ */
+/*     $OpenBSD: pmapae.c,v 1.72 2024/05/30 10:56:24 mpi Exp $ */
 
 /*
  * Copyright (c) 2006-2008 Michael Shalayeff
@@ -990,7 +990,7 @@ pmap_pinit_pd_pae(struct pmap *pmap)
        if (cpu_meltdown) {
                int i;
 
-               va = (vaddr_t)km_alloc(4 * NBPG, &kv_any, &kp_zero, &kd_nowait);
+               va = (vaddr_t)km_alloc(4 * NBPG, &kv_any, &kp_zero, &kd_waitok);
                if (va == 0)
                        panic("%s: kernel_map out of virtual space!", __func__);
                if (!pmap_extract(pmap_kernel(),