Threadripper, virtualization and passthrough

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   With regards to : https://www.reddit.com/r/Amd/comments/6vbe6w/threadripper_broken_on_linux_for_pci_passthrough/
tl;dr: You can't use passthrough on the Threadripper platform, as devices get stuck in the D3 state. PCI bridges throwing errors all over.

I was wondering if there is any upcoming BIOS fixes in the pipeline. At the moment it's looking very bleak for the Threadripper platform when it comes to virtualization. Especially considering the Intel competition is more or less good to go, albeit at an increased price point.

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Filthyscum Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 31 Aug 2017 Location: Norway Status: Offline Points: 5	Post Options Post Reply Quote Filthyscum Report Post Thanks(0) Quote Reply Topic: Threadripper, virtualization and passthrough Posted: 31 Aug 2017 at 8:46pm
	With regards to : https://www.reddit.com/r/Amd/comments/6vbe6w/threadripper_broken_on_linux_for_pci_passthrough/ tl;dr: You can't use passthrough on the Threadripper platform, as devices get stuck in the D3 state. PCI bridges throwing errors all over. I was wondering if there is any upcoming BIOS fixes in the pipeline. At the moment it's looking very bleak for the Threadripper platform when it comes to virtualization. Especially considering the Intel competition is more or less good to go, albeit at an increased price point.

MisterJ Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 19 Apr 2017 Status: Offline Points: 1097	Post Options Post Reply Quote MisterJ Report Post Thanks(1) Quote Reply Posted: 01 Sep 2017 at 12:09am
	Filthyscum, this is an ASRock main board user forum. I guess it is possible that some user might have seen and even resolved this issue but I doubt it. We would, most likely, be one of the last to know about a BIOS update. Looking at your referenced Reddit blog, this sounds like a many board vendor problem and unknown if it is on Windows. I would suggest it is a TR or a Linux problem. I did read the other day that a Linux kernel/Ryzen (TR) problem had been identified that might require an AMD and/or a Linux kernel change. I would suggest you check with Linux support and AMD support. I know almost nothing about Linux, but I do know AMD technical support is very responsive. Hope this all helps. Enjoy, John.
	Fat1 X399 Pro Gaming, TR 1950X, RAID0 3xSamsung SSD 960 EVO, G.SKILL FlareX F4-3200C14Q-32GFX, Win 10 x64 Pro, Enermx Platimax 850, Enermx Liqtech TR4 CPU Cooler, Radeon RX580, BIOS 2.00, 2xHDDs WD

Filthyscum Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 31 Aug 2017 Location: Norway Status: Offline Points: 5	Post Options Post Reply Quote Filthyscum Report Post Thanks(0) Quote Reply Posted: 01 Sep 2017 at 3:01am
	Thank you for your reply, John! The thing is that no word from AMD has come on this, and I'm basically trying to use a "shotgun to find answers" (wide enough spread and you might hit an answer). I think the problem you are referring to hearing about is the nested page tables bug in KVM, and that is a software bug that has been around for some 8-odd years. I have some hope that KVM and AMD will figure that one out.

MisterJ Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 19 Apr 2017 Status: Offline Points: 1097	Post Options Post Reply Quote MisterJ Report Post Thanks(0) Quote Reply Posted: 01 Sep 2017 at 5:11am
	You are welcome, Filthyscum. I assume you do not think the KVM problem is associated with the PCIe problem? Good luck and enjoy, John. EDIT: I assume you have seen this. Threadripper is, of course, made up of Ryzen chips. Edited by MisterJ - 01 Sep 2017 at 5:19am
	Fat1 X399 Pro Gaming, TR 1950X, RAID0 3xSamsung SSD 960 EVO, G.SKILL FlareX F4-3200C14Q-32GFX, Win 10 x64 Pro, Enermx Platimax 850, Enermx Liqtech TR4 CPU Cooler, Radeon RX580, BIOS 2.00, 2xHDDs WD

wardog Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 15 Jul 2015 Status: Offline Points: 6447	Post Options Post Reply Quote wardog Report Post Thanks(0) Quote Reply Posted: 01 Sep 2017 at 8:37am
	By chance are you using an nVidia GPU(s)? There's some kernel talk on this Level1Tech Ryzen thread. No reason whatsoever to believe Passthrough to not work on TR. None I'm aware. Waiting on ASRock to set me up with a TR so I don't have a better answer atm. https://level1techs.com/article/ryzen-gpu-passthrough-setup-guide-fedora-26-windows-gaming-linux