问题描述
要检查是否在BIOS/UEFI中启用了Intel的VT-X或AMD的AMD-V，我使用:
To check if Intel's VT-X or AMD's AMD-V is enabled in the BIOS/UEFI, I use:
if systool -m kvm_amd -v &> /dev/null || systool -m kvm_intel -v &> /dev/null ; then
echo "AMD-V / VT-X is enabled in the BIOS/UEFI."
else
echo "AMD-V / VT-X is not enabled in the BIOS/UEFI"
fi
我找不到方法来检查是否在BIOS/UEFI中启用了Intel的VT-D或AMD的IOMMU.
I couldn't find a way to check if Intel's VT-D or AMD's IOMMU are enabled in the BIOS/UEFI.
我需要一种无需设置iommu内核参数(iommu=1，amd_iommu=on，intel_iommu=on)的方法来检测它是否已启用.
I need a way to detect if it is enabled or not without having the iommu kernel parameters set (iommu=1, amd_iommu=on, intel_iommu=on).
我曾经有一个想法是使用rdmsr，但是我不确定这是否行得通.我最初不是使用systool而是使用sudo rdmsr 0x3A，但是它对我不起作用.它总是报告:
One idea I had was to use rdmsr, but I'm not sure if that would work. Instead of systool I initially wanted to use sudo rdmsr 0x3A, but it didn't work for me. It always reports:
rdmsr: CPU 0 cannot read MSR 0x0000003a
rdmsr是msr-tools btw的一部分.要使用该功能，需要先加载msr kenel模块(sudo modprobe msr).
rdmsr is part of msr-tools btw. And to be used requires the msr kenel module to be loaded (sudo modprobe msr) first.
据称sudo rdmsr 0x3A应该已经返回3或5来指示已启用VT-X/AMD-V ...
Allegedly sudo rdmsr 0x3A should have returned 3 or 5 to indicate that VT-X/AMD-V is enabled...
推荐答案
如果启用了VT-d，则Linux将在引导时配置DMA重映射.最简单的方法是在dmesg中查找DMAR条目.如果没有看到错误，则启用VT-d.
If VT-d is enabled, Linux will configure DMA Remapping at boot time. The easiest way to find this is to look in dmesg for DMAR entries. If you don't see errors, then VT-d is enabled.
例如:
[root@localhost ~]# dmesg | grep DMAR
[ 0.000000] ACPI: DMAR 0x00000000BBECB000 0000A8 (v01 LENOVO TP-R0D 00000930 PTEC 00000002)
[ 0.001000] DMAR: Host address width 39
[ 0.001000] DMAR: DRHD base: 0x000000fed90000 flags: 0x0
[ 0.001000] DMAR: dmar0: reg_base_addr fed90000 ver 1:0 cap 1c0000c40660462 ecap 19e2ff0505e
[ 0.001000] DMAR: DRHD base: 0x000000fed91000 flags: 0x1
[ 0.001000] DMAR: dmar1: reg_base_addr fed91000 ver 1:0 cap d2008c40660462 ecap f050da
[ 0.001000] DMAR: RMRR base: 0x000000bbdd8000 end: 0x000000bbdf7fff
[ 0.001000] DMAR: RMRR base: 0x000000bd000000 end: 0x000000bf7fffff
[ 0.001000] DMAR-IR: IOAPIC id 2 under DRHD base 0xfed91000 IOMMU 1
[ 0.001000] DMAR-IR: HPET id 0 under DRHD base 0xfed91000
[ 0.001000] DMAR-IR: Queued invalidation will be enabled to support x2apic and Intr-remapping.
[ 0.002000] DMAR-IR: Enabled IRQ remapping in x2apic mode
另一个选择退出x2apic的示例:
Another example with x2apic opt out:
[root@localhost ~]# dmesg | grep DMAR
[ 0.000000] ACPI: DMAR 0000000079a20300 000C4 (v01 SUPERM SMCI--MB 00000001 INTL 20091013)
[ 0.106389] DMAR: Host address width 46
[ 0.106392] DMAR: DRHD base: 0x000000fbffc000 flags: 0x1
[ 0.106400] DMAR: dmar0: reg_base_addr fbffc000 ver 1:0 cap 8d2078c106f0466 ecap f020de
[ 0.106402] DMAR: RMRR base: 0x0000007bb24000 end: 0x0000007bb32fff
[ 0.106404] DMAR: ATSR flags: 0x0
[ 0.106407] DMAR: RHSA base: 0x000000fbffc000 proximity domain: 0x0
[ 0.106409] DMAR-IR: IOAPIC id 8 under DRHD base 0xfbffc000 IOMMU 0
[ 0.106411] DMAR-IR: HPET id 0 under DRHD base 0xfbffc000
[ 0.106413] DMAR-IR: x2apic is disabled because BIOS sets x2apic opt out bit.
[ 0.106414] DMAR-IR: Use 'intremap=no_x2apic_optout' to override the BIOS setting.
[ 0.106591] DMAR-IR: Enabled IRQ remapping in xapic mode
无论哪种方式，您都在寻找最后一行DMAR-IR: Enabled IRQ remapping in <whichever> mode.
Either way, you're looking for that last line, DMAR-IR: Enabled IRQ remapping in <whichever> mode.
在禁用了VT-d的系统上，您将看到错误消息，或者什么都没有.
On a system with VT-d disabled, you will either see an error message, or nothing at all.
[root@localhost ~]# dmesg | grep DMAR
[root@localhost ~]#
这篇关于检查是否在BIOS/UEFI中启用了VT-D/IOMMU的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！