GPU pass through

S

sakupataku

New Member
Dec 1, 2023
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hi!
i'm a beginner on proxmox. I bought a chinese motherboard and i installed proxmox. i has been great until i bought a GPU because i wanted to pass it through to a windows VM. but i didn't find IOMMU in my BIOS. No IOMMU detected please activate it.

root@server:~# dmesg | grep IOMMU
[ 0.327382] DMAR-IR: IOAPIC id 3 under DRHD base 0xfbffc000 IOMMU 0
[ 0.327384] DMAR-IR: IOAPIC id 1 under DRHD base 0xc7ffc000 IOMMU 1
[ 0.327385] DMAR-IR: IOAPIC id 2 under DRHD base 0xc7ffc000 IOMMU 1

what can i do, if anyone can help
 
leesteken said:
intel_iommu=on is missing. Please follow the manual and add intel_iommu=on: https://pve.proxmox.com/pve-docs/pve-admin-guide.html#qm_pci_passthrough
Click to expand...

i added it before but it's not working.
so i thought it was because i didn't enable IOMMU. in my bios i can only find VT-d and it's enabled.

GRUB_DEFAULT=0
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet"
GRUB_CMDLINE_LINUX="intel_iommu=on"
GRUB_CMDLINE_LINUX=""


vfio
vfio_iommu_type1
vfio_pci
vfio_virqfd
 
sakupataku said:
i added it before but it's not working.
Click to expand...
Did adding intel_iommu=on not work or did IOMMU not work?
sakupataku said:
so i thought it was because i didn't enable IOMMU. in my bios i can only find VT-d and it's enabled.
Click to expand...
Then it's likely that you did not add intel_iommu=on correctly. Did you follow the steps in the manual carefully?
sakupataku said:
GRUB_DEFAULT=0
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet"
GRUB_CMDLINE_LINUX="intel_iommu=on"
GRUB_CMDLINE_LINUX=""
Click to expand...
Your GRUB configuration is different from what I expect from Proxmox. What is the output of cat /proc/cmdline now?
sakupataku said:
vfio
vfio_iommu_type1
vfio_pci
vfio_virqfd
Click to expand...
vfio_virqfd is no longer a module since kernel 6.2 (which is in the manual).
 
leesteken said:
Did adding intel_iommu=on not work or did IOMMU not work?

Then it's likely that you did not add intel_iommu=on correctly. Did you follow the steps in the manual carefully?

Your GRUB configuration is different from what I expect from Proxmox. What is the output of cat /proc/cmdline now?

vfio_virqfd is no longer a module since kernel 6.2 (which is in the manual).
Click to expand...
server:~# dmesg | grep -e DMAR -e IOMMU
[ 0.010794] ACPI: DMAR 0x000000007998F4B8 000180 (v01 ALASKA A M I 00000001 INTL 20091013)
[ 0.010830] ACPI: Reserving DMAR table memory at [mem 0x7998f4b8-0x7998f637]
[ 0.326937] DMAR: Host address width 46
[ 0.326938] DMAR: DRHD base: 0x000000fbffc000 flags: 0x0
[ 0.326945] DMAR: dmar0: reg_base_addr fbffc000 ver 1:0 cap 8d2078c106f0466 ecap f020df
[ 0.326947] DMAR: DRHD base: 0x000000c7ffc000 flags: 0x1
[ 0.326956] DMAR: dmar1: reg_base_addr c7ffc000 ver 1:0 cap 8d2078c106f0466 ecap f020df
[ 0.326958] DMAR: RMRR base: 0x0000007bb51000 end: 0x0000007bb60fff
[ 0.326960] DMAR: ATSR flags: 0x0
[ 0.326962] DMAR: RHSA base: 0x000000c7ffc000 proximity domain: 0x0
[ 0.326963] DMAR: RHSA base: 0x000000fbffc000 proximity domain: 0x1
[ 0.326965] DMAR-IR: IOAPIC id 3 under DRHD base 0xfbffc000 IOMMU 0
[ 0.326967] DMAR-IR: IOAPIC id 1 under DRHD base 0xc7ffc000 IOMMU 1
[ 0.326968] DMAR-IR: IOAPIC id 2 under DRHD base 0xc7ffc000 IOMMU 1
[ 0.326970] DMAR-IR: HPET id 0 under DRHD base 0xc7ffc000
[ 0.326971] DMAR-IR: Queued invalidation will be enabled to support x2apic and Intr-remapping.
[ 0.327781] DMAR-IR: Enabled IRQ remapping in x2apic mode
root@server:~#



isn't there supposed the be this line "DMAR: IOMMU enabled" or "DMAR: IOMMU disabled"?
Does't this mean the motherboard can't support IOMMU?
 
sakupataku said:
server:~# cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-6.5.11-4-pve root=/dev/mapper/pve-root ro quiet
Click to expand...
intel_iommu=on is still missing. Therefore IOMMU is not enabled and we cannot determine anything. Please add intel_iommu=on as described in the Proxmox manual: https://pve.proxmox.com/pve-docs/pve-admin-guide.html#sysboot_edit_kernel_cmdline (or start reading at https://pve.proxmox.com/pve-docs/pve-admin-guide.html#qm_pci_passthrough ).

EDIT: If you are having trouble with parts of the manual, finding out which bootloader is used, editing files or apply the changes, please ask questions about it.
 
Last edited:
leesteken said:
intel_iommu=on is still missing. Therefore IOMMU is not enabled and we cannot determine anything. Please add intel_iommu=on as described in the Proxmox manual: https://pve.proxmox.com/pve-docs/pve-admin-guide.html#sysboot_edit_kernel_cmdline (or start reading at https://pve.proxmox.com/pve-docs/pve-admin-guide.html#qm_pci_passthrough ).

EDIT: If you are having trouble with parts of the manual, finding out which bootloader is used, editing files or apply the changes, please ask questions about it.
Click to expand...
Thanks it worked. i mad a mistake when i was adding the configurations. Thanks a lot!
 
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