[src/trunk]: src/sys/dev/nvmm/x86 Mask CPUID leaf 0x0A on Intel, because we d...

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

details:   https://anonhg.NetBSD.org/src/rev/76881784e085
branches:  trunk
changeset: 460528:76881784e085
user:      maxv <maxv%NetBSD.org@localhost>
date:      Sun Oct 27 11:11:09 2019 +0000

description:
Mask CPUID leaf 0x0A on Intel, because we don't want the guest to try (and
fail) to probe the PMC MSRs. This avoids "Unexpected WRMSR" warnings in
qemu-nvmm.

diffstat:

 sys/dev/nvmm/x86/nvmm_x86_vmx.c |  10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)

diffs (31 lines):

diff -r 9414165b1737 -r 76881784e085 sys/dev/nvmm/x86/nvmm_x86_vmx.c
--- a/sys/dev/nvmm/x86/nvmm_x86_vmx.c   Sun Oct 27 11:08:04 2019 +0000
+++ b/sys/dev/nvmm/x86/nvmm_x86_vmx.c   Sun Oct 27 11:11:09 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: nvmm_x86_vmx.c,v 1.41 2019/10/27 10:28:55 maxv Exp $   */
+/*     $NetBSD: nvmm_x86_vmx.c,v 1.42 2019/10/27 11:11:09 maxv Exp $   */
 
 /*
  * Copyright (c) 2018-2019 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: nvmm_x86_vmx.c,v 1.41 2019/10/27 10:28:55 maxv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: nvmm_x86_vmx.c,v 1.42 2019/10/27 11:11:09 maxv Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -1172,6 +1172,12 @@
                cpudata->gprs[NVMM_X64_GPR_RCX] &= nvmm_cpuid_00000007.ecx;
                cpudata->gprs[NVMM_X64_GPR_RDX] &= nvmm_cpuid_00000007.edx;
                break;
+       case 0x0000000A:
+               cpudata->gprs[NVMM_X64_GPR_RAX] = 0;
+               cpudata->gprs[NVMM_X64_GPR_RBX] = 0;
+               cpudata->gprs[NVMM_X64_GPR_RCX] = 0;
+               cpudata->gprs[NVMM_X64_GPR_RDX] = 0;
+               break;
        case 0x0000000D:
                if (vmx_xcr0_mask == 0) {
                        break;