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[src/trunk]: src/sys/dev/nvmm/x86 nvmm-x86-svm: check the SVM revision
details: https://anonhg.NetBSD.org/src/rev/a7484cde92ff
branches: trunk
changeset: 943475:a7484cde92ff
user: maxv <maxv%NetBSD.org@localhost>
date: Fri Sep 04 17:06:23 2020 +0000
description:
nvmm-x86-svm: check the SVM revision
Only revision 1 exists, but check it, for future-proofness.
diffstat:
sys/dev/nvmm/x86/nvmm_x86_svm.c | 10 ++++++++--
1 files changed, 8 insertions(+), 2 deletions(-)
diffs (31 lines):
diff -r ade867502fd0 -r a7484cde92ff sys/dev/nvmm/x86/nvmm_x86_svm.c
--- a/sys/dev/nvmm/x86/nvmm_x86_svm.c Fri Sep 04 17:05:39 2020 +0000
+++ b/sys/dev/nvmm/x86/nvmm_x86_svm.c Fri Sep 04 17:06:23 2020 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: nvmm_x86_svm.c,v 1.74 2020/08/26 16:33:03 maxv Exp $ */
+/* $NetBSD: nvmm_x86_svm.c,v 1.75 2020/09/04 17:06:23 maxv Exp $ */
/*
* Copyright (c) 2018-2020 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: nvmm_x86_svm.c,v 1.74 2020/08/26 16:33:03 maxv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: nvmm_x86_svm.c,v 1.75 2020/09/04 17:06:23 maxv Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@@ -2445,6 +2445,12 @@
}
x86_cpuid(0x8000000a, descs);
+ /* Expect revision 1. */
+ if (__SHIFTOUT(descs[0], CPUID_AMD_SVM_REV) != 1) {
+ printf("NVMM: SVM revision not supported\n");
+ return false;
+ }
+
/* Want Nested Paging. */
if (!(descs[3] & CPUID_AMD_SVM_NP)) {
printf("NVMM: SVM-NP not supported\n");
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