我已经在 BIOS 中启用了 svm 和 iommu,但我从 dmesg 得到“不可用”:
root@xen:~# dmesg |grep -i iommu
[ 0.000000] Command line: placeholder root=UUID=0b6a99ef-b56b-4d71-9f63-4895d0276674 ro nouveau.blacklist=1 amd_iommu=on iommu=pt iommu=soft iommu=1 pci-stub=10de:1401,10de:0fba
[ 0.000000] Kernel command line: placeholder root=UUID=0b6a99ef-b56b-4d71-9f63-4895d0276674 ro nouveau.blacklist=1 amd_iommu=on iommu=pt iommu=soft iommu=1 pci-stub=10de:1401,10de:0fba
[ 5.177737] AMD IOMMUv2 driver by Joerg Roedel <[email protected]>
[ 5.177744] AMD IOMMUv2 functionality not available on this system
root@xen:~# uname -a
Linux xen 4.4.0-21-generic #37-Ubuntu SMP Mon Apr 18 18:33:37 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
root@xen:~# cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=16.04
DISTRIB_CODENAME=xenial
DISTRIB_DESCRIPTION="Ubuntu 16.04 LTS"
root@xen:~# dmidecode |grep -i product
Product Name: To be filled by O.E.M.
Product Name: 990FXA-UD5 R5
root@xen:~# grep Processor /proc/cpuinfo |tail -1
model name : AMD FX(tm)-8300 Eight-Core Processor
root@xen:~# grep iommu /etc/default/grub
GRUB_CMDLINE_LINUX_DEFAULT="nouveau.blacklist=1 amd_iommu=on iommu=pt iommu=soft iommu=1 pci-stub=10de:1401,10de:0fba
我需要更新主板BIOS吗?目前处于F3;如果可能的话,我想避免它,因为它可能会损坏主板。