iommu

Check if VT-D / IOMMU has been enabled in the BIOS/UEFI

由 守給你的承諾、 提交于 2020-05-27 09:24:28
问题 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 I couldn't find a way to check if Intel's VT-D or AMD's IOMMU are enabled in the BIOS/UEFI. 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

Check if VT-D / IOMMU has been enabled in the BIOS/UEFI

由 流过昼夜 提交于 2020-05-27 09:24:10
问题 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 I couldn't find a way to check if Intel's VT-D or AMD's IOMMU are enabled in the BIOS/UEFI. 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

IOMMU initialization without BIOS support

由 懵懂的女人 提交于 2019-12-06 19:33:25
问题 NOTE : if you have an AMD A55 chipset on a motherboard that support IOMMU, please send me a copy of your /sys/firmware/acpi/tables/DMAR (or whatever the name is that describes IOMMU). There is no risk of any sort for you. Thanks! Most motherboard manufacturers don't bother releasing IOMMU enabled BIOS (no option in the BIOS). My undesranding of this document from AMD is that the BIOS initializes the IOMMU by adding ACPI tables. So if I can get a dump of the ACPI tables (acpidump/acpiextract)

check for IOMMU support on linux [closed]

由 谁都会走 提交于 2019-12-05 05:51:30
Closed. This question is off-topic . It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 2 years ago . I'd like to verify on any given Linux machine if PCI passthrough is supported. After a bit of googling, I found that I should rather check if IOMMU is supported, and I did so by running: dmesg | grep IOMMU If it supports IOMMU (and not IOMMUv2), I would get: IOMMU [ 0.000000] DMAR: IOMMU enabled [ 0.049734] DMAR-IR: IOAPIC id 8 under DRHD base 0xfbffc000 IOMMU 0 [ 0.049735] DMAR-IR: IOAPIC id 9 under DRHD base

IOMMU initialization without BIOS support

由 元气小坏坏 提交于 2019-12-05 02:04:05
NOTE : if you have an AMD A55 chipset on a motherboard that support IOMMU, please send me a copy of your /sys/firmware/acpi/tables/DMAR (or whatever the name is that describes IOMMU). There is no risk of any sort for you. Thanks! Most motherboard manufacturers don't bother releasing IOMMU enabled BIOS (no option in the BIOS). My undesranding of this document from AMD is that the BIOS initializes the IOMMU by adding ACPI tables. So if I can get a dump of the ACPI tables (acpidump/acpiextract) from a system with a different motherboard but the same chipset that supports IOMMU, would it be

Linux IOMMU page tables

由 ⅰ亾dé卋堺 提交于 2019-12-04 23:58:22
问题 I've been reading about IOMMU support in Linux and have some questions regarding page tables in IOMMU: Does the IOMMU uses the CPU MMU page tables for storing the VA → PA mapping? If not, i.e. the virtual addresses are different, then are the mappings created per device or per IOMMU unit? I haven't looked at any driver code yet, so it would be great if anyone can point me to some sample driver code. 回答1: Does the IOMMU uses the CPU MMU page tables for storing VA->PA mapping? No. There are
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