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Date:      Fri, 4 Aug 2017 21:38:34 +0000 (UTC)
From:      Marius Strobl <marius@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org
Subject:   svn commit: r322063 - stable/10/sys/amd64/amd64
Message-ID:  <201708042138.v74LcYBd046693@repo.freebsd.org>
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Author: marius
Date: Fri Aug  4 21:38:34 2017
New Revision: 322063
URL: https://svnweb.freebsd.org/changeset/base/322063

Log:
  MFC: r290156, r318354
  
  pmap_change_attr: Only fixup DMAP for DMAPed ranges

Modified:
  stable/10/sys/amd64/amd64/pmap.c
Directory Properties:
  stable/10/   (props changed)

Modified: stable/10/sys/amd64/amd64/pmap.c
==============================================================================
--- stable/10/sys/amd64/amd64/pmap.c	Fri Aug  4 21:06:47 2017	(r322062)
+++ stable/10/sys/amd64/amd64/pmap.c	Fri Aug  4 21:38:34 2017	(r322063)
@@ -6559,7 +6559,7 @@ pmap_change_attr_locked(vm_offset_t va, vm_size_t size
 	 */
 	for (tmpva = base; tmpva < base + size; ) {
 		pdpe = pmap_pdpe(kernel_pmap, tmpva);
-		if (*pdpe == 0)
+		if (pdpe == NULL || *pdpe == 0)
 			return (EINVAL);
 		if (*pdpe & PG_PS) {
 			/*
@@ -6632,7 +6632,8 @@ pmap_change_attr_locked(vm_offset_t va, vm_size_t size
 				    X86_PG_PDE_CACHE);
 				changed = TRUE;
 			}
-			if (tmpva >= VM_MIN_KERNEL_ADDRESS) {
+			if (tmpva >= VM_MIN_KERNEL_ADDRESS &&
+			    (*pdpe & PG_PS_FRAME) < dmaplimit) {
 				if (pa_start == pa_end) {
 					/* Start physical address run. */
 					pa_start = *pdpe & PG_PS_FRAME;
@@ -6661,7 +6662,8 @@ pmap_change_attr_locked(vm_offset_t va, vm_size_t size
 				    X86_PG_PDE_CACHE);
 				changed = TRUE;
 			}
-			if (tmpva >= VM_MIN_KERNEL_ADDRESS) {
+			if (tmpva >= VM_MIN_KERNEL_ADDRESS &&
+			    (*pde & PG_PS_FRAME) < dmaplimit) {
 				if (pa_start == pa_end) {
 					/* Start physical address run. */
 					pa_start = *pde & PG_PS_FRAME;
@@ -6688,7 +6690,8 @@ pmap_change_attr_locked(vm_offset_t va, vm_size_t size
 				    X86_PG_PTE_CACHE);
 				changed = TRUE;
 			}
-			if (tmpva >= VM_MIN_KERNEL_ADDRESS) {
+			if (tmpva >= VM_MIN_KERNEL_ADDRESS &&
+			    (*pte & PG_FRAME) < dmaplimit) {
 				if (pa_start == pa_end) {
 					/* Start physical address run. */
 					pa_start = *pte & PG_FRAME;

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