[PVE-User] Host Rebooting when using PCIe Passthrough

Craig Jones cj0nes at live.com
Wed Jul 31 14:27:35 CEST 2019

Just wanted to follow through on this.

I took the NIC out and was still having reboots. I swapped the GPU with 
a different one and have not had anymore reboots. Hopefully this remains 
when I add a NIC back, but the resolution was swapping the card. There's 
something funky with the original GPU I was using.

Thanks for the suggestions!

On 7/5/2019 1:23 AM, Dominik Csapak wrote:
> On 7/4/19 8:45 PM, Craig Jones wrote:
>> Hello,
>> I have a VM that I'm passing a GPU through to. The passthrough itself
>> works great. The issue is that whenever this VM is powered on, the host
>> will reboot without any interaction from me. The reboot happens anywhere
>> from 3 - 15 minutes after the VM has been powered on. I have many other
>> VMs that don't cause this. The only difference between them and this one
>> is the passthrough GPU. Attached are some potentially helpful outputs.
>> The syslogs have been truncated from when the VM had been powered on to
>> the last entry right before the host rebooted.
>> Thanks,
>> Craig
> one thing you could do is setup kernel crash logging (kdump) to see
> if the kernel crashes and why
> aside from that the only thing i see is that your gpu is not
> in an isolated iommu group:
> ----8<----
> /sys/kernel/iommu_groups/1/devices/0000:00:01.0
> /sys/kernel/iommu_groups/1/devices/0000:00:01.1
> /sys/kernel/iommu_groups/1/devices/0000:01:00.0
> /sys/kernel/iommu_groups/1/devices/0000:01:00.1
> /sys/kernel/iommu_groups/1/devices/0000:02:00.0
> ---->8----
> 01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. 
> [AMD/ATI] RV770 [Radeon HD 4870]
> 01:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] RV770 
> HDMI Audio [Radeon HD 4850/4870]
> 02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. 
> RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 07)
> it seems it is together in a group with your nic
> this can be the cause for the crashes...
> hope this helps
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