X399 Taichi Hardware Virtualization not working

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   Hi,

Afer update to bios 4.X hardware virtualization stopped working. Programs detects hw virtualization as enabled but vm is so slow that you cannot use it. CPU in vm is at 100%. If you click start menu in windows vm you will wait to appear couple of seconds. System is slow and unresponsive. If you downgrade bios to 3.X version everything is ok. 4.X bios has new features and security fixes but it`s unusable for testing things in virtual machines.

My System 
X399 taichi
Threadripper 1950X
64G G.Skill TridentZ 3200 CL15

Best Regards.

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rmal Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 24 Feb 2024 Status: Offline Points: 50	Post Options Post Reply Quote rmal Report Post Thanks(0) Quote Reply Topic: X399 Taichi Hardware Virtualization not working Posted: 24 Feb 2024 at 5:49pm
	Hi, Afer update to bios 4.X hardware virtualization stopped working. Programs detects hw virtualization as enabled but vm is so slow that you cannot use it. CPU in vm is at 100%. If you click start menu in windows vm you will wait to appear couple of seconds. System is slow and unresponsive. If you downgrade bios to 3.X version everything is ok. 4.X bios has new features and security fixes but it`s unusable for testing things in virtual machines. My System X399 taichi Threadripper 1950X 64G G.Skill TridentZ 3200 CL15 Best Regards.

SerchTech Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 16 Oct 2022 Location: Spain Status: Offline Points: 1335	Post Options Post Reply Quote SerchTech Report Post Thanks(0) Quote Reply Posted: 25 Feb 2024 at 6:34pm
	Hi Do you use Hyper-V or VirtualBox?
	X399 Taichi (4.03) Threadripper 2950X DDR4 2 x HX432C16FB3K2/32

rmal Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 24 Feb 2024 Status: Offline Points: 50	Post Options Post Reply Quote rmal Report Post Thanks(0) Quote Reply Posted: 25 Feb 2024 at 6:57pm
	Fedora 39 VirtualBox, KVM, VMware Workstation. It does not matter. Everywhere is slow. Yesterday I tested beta 4.01 and 3.92 and both are affected. Everything is ok with 3.90 or older.New bioses have rbar feature but with rbar on or off there is no difference.

SerchTech Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 16 Oct 2022 Location: Spain Status: Offline Points: 1335	Post Options Post Reply Quote SerchTech Report Post Thanks(0) Quote Reply Posted: 25 Feb 2024 at 8:37pm
	I am not an advanced virtualization user but in my case can run several shared VMs on Fedora39 and Windows11 with VirtualBox and without problems, regardless of ReBAR enabled or not under BIOS 4.03 and previous versions. If a clear CMOS does not solve your problem you should contact ASRock support. Sorry, I don't have any more advice or knowledge to help you, hopping other users here do
	X399 Taichi (4.03) Threadripper 2950X DDR4 2 x HX432C16FB3K2/32

rmal Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 24 Feb 2024 Status: Offline Points: 50	Post Options Post Reply Quote rmal Report Post Thanks(0) Quote Reply Posted: 26 Feb 2024 at 7:41am
	Thank you. Resetting BIOS doesn't help. Probably 1gen Threadripper support is broken.