D51364.id.diff
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	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
	@@ -2475,6 +2475,7 @@
	struct pmap_preinit_mapping *ppim;
	vm_page_t m, mpte;
	pml4_entry_t *pml4e;
	+ unsigned long lm_max;
	int error, i, ret, skz63;

	/* L1TF, reserve page @0 unconditionally */
	@@ -2600,10 +2601,15 @@

	lm_ents = 8;
	TUNABLE_INT_FETCH("vm.pmap.large_map_pml4_entries", &lm_ents);
	- if (lm_ents > LMEPML4I - LMSPML4I + 1)
	- lm_ents = LMEPML4I - LMSPML4I + 1;
	+ lm_max = (kva_layout.lm_high - kva_layout.lm_low) / NBPML4;
	+ if (lm_ents > lm_max) {
	+ printf(
	+ "pmap: shrinking large map from requested %d slots to %ld slots\n",
	+ lm_ents, lm_max);
	+ lm_ents = lm_max;
	+ }
	#ifdef KMSAN
	- if (lm_ents > KMSANORIGPML4I - LMSPML4I) {
	+ if (!la57 && lm_ents > KMSANORIGPML4I - LMSPML4I) {
	printf(
	"pmap: shrinking large map for KMSAN (%d slots to %ld slots)\n",
	lm_ents, KMSANORIGPML4I - LMSPML4I);
	@@ -2615,8 +2621,7 @@
	lm_ents, (u_long)lm_ents * (NBPML4 / 1024 / 1024 / 1024));
	if (lm_ents != 0) {
	large_vmem = vmem_create("large", kva_layout.lm_low,
	- (vmem_size_t)kva_layout.lm_high - kva_layout.lm_low,
	- PAGE_SIZE, 0, M_WAITOK);
	+ (vmem_size_t)lm_ents * NBPML4, PAGE_SIZE, 0, M_WAITOK);
	if (large_vmem == NULL) {
	printf("pmap: cannot create large map\n");
	lm_ents = 0;