Error start virtual machine

[alex_13]

I don't understand why my virtual machine won't start, it gives me this error

TASK ERROR: cannot prepare PCI pass-through, IOMMU not present

I am a beginner in using proxmox

 

[leesteken]

I don't understand why my virtual machine won't start, it gives me this error

TASK ERROR: cannot prepare PCI pass-through, IOMMU not present

Did you enable IOMMU or VT-d in the motherboard BIOS? What motherboard and CPU are you using? What is the output of cat /proc/cmdline?
Did you look at the manual? There is a mistake in the manual; for Intel system you always need intel_iommu=on. Did you see any of all the other threads on the forum about enablind IOMMU?

 

[alex_13]

Did you enable IOMMU or VT-d in the motherboard BIOS? What motherboard and CPU are you using? What is the output of cat /proc/cmdline?
Did you look at the manual? There is a mistake in the manual; for Intel system you always need intel_iommu=on. Did you see any of all the other threads on the forum about enablind IOMMU?

I don't know if it's enable in the BIOS, I'll check tomorrow. I have the motherboard Gigabyte GA-H110M-S2H, Intel i5-7400 3Ghz, Sapphire Radeon RX 560 PULSE. When I entered the command cat /proc/cmdline this appears BOOT_IMAGE=/boot/vmlinuz-5.15.53-1-pve root=/dev/mapper/pve-root ro quiet amd_iommu=on

 

[leesteken]

I don't know if it's enable in the BIOS, I'll check tomorrow. I have the motherboard Gigabyte GA-H110M-S2H, Intel i5-7400 3Ghz, Sapphire Radeon RX 560 PULSE. When I entered the command cat /proc/cmdline this appears BOOT_IMAGE=/boot/vmlinuz-5.15.53-1-pve root=/dev/mapper/pve-root ro quiet amd_iommu=on

amd_iommu=on is nonsense because it is on by default on AMD and you have an Intel platform.
You need to put intel_iommu=on on the kernel command line and it needs to be enabled in the motherboard BIOS.
You CPU supports VT-d and your motherboard chipset also. For an RX560 you need to setup vendor-reset.
I hope those links can get you started to enable IOMMU and learn about vendor-reset to PCIe passthrough the RX560.

 

[alex_13]

amd_iommu=on is nonsense because it is on by default on AMD and you have an Intel platform.
You need to put intel_iommu=on on the kernel command line and it needs to be enabled in the motherboard BIOS.
You CPU supports VT-d and your motherboard chipset also. For an RX560 you need to setup vendor-reset.
I hope those links can get you started to enable IOMMU and learn about vendor-reset to PCIe passthrough the RX560.

Apparently VT-d was activated and I modified in intel_iommu=on. I installed dkms in pve but now it keeps restarting when I start the VM and get this too

swtpm_setup: Not overwriting existing state file.
Use of uninitialized value $PVE::JSONSchema:VE_TAG_RE in concatenation (.) or string at /usr/share/perl5/PVE/DataCenterConfig.pm line 169.
Use of uninitialized value $PVE::JSONSchema:VE_TAG_RE in concatenation (.) or string at /usr/share/perl5/PVE/DataCenterConfig.pm line 204.
Use of uninitialized value $PVE::JSONSchema:VE_TAG_RE in concatenation (.) or string at /usr/share/perl5/PVE/DataCenterConfig.pm line 204.
Use of uninitialized value $PVE::JSONSchema:VE_TAG_RE in concatenation (.) or string at /usr/share/perl5/PVE/DataCenterConfig.pm line 230.
Use of uninitialized value $PVE::JSONSchema:VE_TAG_RE in concatenation (.) or string at /usr/share/perl5/PVE/DataCenterConfig.pm line 230.

And this appears on the monitor directly from the PC