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nvmm-x86-svm: check the SVM revision

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Only revision 1 exists, but check it, for future-proofness.
This commit is contained in:
maxv 2020-09-04 17:06:23 +00:00
parent 60c2e21286
commit 70cdbf1a90
1 changed files with 8 additions and 2 deletions
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10
sys/dev/nvmm/x86/nvmm_x86_svm.c
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@ -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 @@ svm_ident(void)
}
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");