[src/trunk]: src/share/man/man4 nvmm(4): Document that VMX Unrestricted Guest...

[gdt <gdt%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/37570c27a59c
branches:  trunk
changeset: 378330:37570c27a59c
user:      gdt <gdt%NetBSD.org@localhost>
date:      Sat Jul 29 23:11:50 2023 +0000

description:
nvmm(4): Document that VMX Unrestricted Guest is required

diffstat:

 share/man/man4/nvmm.4 |  8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diffs (29 lines):

diff -r dd982c95a069 -r 37570c27a59c share/man/man4/nvmm.4
--- a/share/man/man4/nvmm.4     Sat Jul 29 22:43:56 2023 +0000
+++ b/share/man/man4/nvmm.4     Sat Jul 29 23:11:50 2023 +0000
@@ -1,4 +1,4 @@
-.\"    $NetBSD: nvmm.4,v 1.6 2020/09/05 07:22:25 maxv Exp $
+.\"    $NetBSD: nvmm.4,v 1.7 2023/07/29 23:11:50 gdt Exp $
 .\"
 .\" Copyright (c) 2018-2020 Maxime Villard, m00nbsd.net
 .\" All rights reserved.
@@ -26,7 +26,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd February 9, 2020
+.Dd July 30, 2023
 .Dt NVMM 4
 .Os
 .Sh NAME
@@ -52,6 +52,10 @@ x86-SVM, for x86 AMD CPUs
 .It
 x86-VMX, for x86 Intel CPUs
 .El
+Note that for VMX support, the CPU must also support "VMX Unrestricted
+Guest", which is only present if Extended Page Tables (EPT) is
+supported.  The earliest CPU family with this feature is Westmere, and
+not all later CPUs have it.
 .Sh SEE ALSO
 .Xr libnvmm 3 ,
 .Xr nvmmctl 8