Virtualization does not work anymore

Question

I have a CLEVO PC and since I've owned it I've always used VirtualBox to create VMs.

Recently, I noticed that in the BIOS there is no option to disable and enable the VT-X function. So I updated the BIOS to the latest version but unfortunately the option was not added. Actually from the BIOS I can only enable the VD-T function

I took advantage to update Windows from scratch and I reinstalled my virtual machine.

Everything worked without problems, when one day he program gives me the error:

VT-x is not available (VERR_VMX_NO_VMX)

Through the "securable" app I discovered this:

But I'm sure my processor supports the VT-X function as confirmed by Intel’s ARK:

However the Intel app on the machine itself says otherwise:

Then I saw with CPUID that the bit of the register 0x3A of my processor is set to 1, which means if I remember correctly: activate VMXON in SMX mode.

Anyone have an idea?

FWIW, I'm using Windows 10 and a friend of mine has the same PC as mine but with no updates; I did the various tests and on its pc the CPU register bit is 5 and in fact "securable" in the hardware virtualization voice says yes so it's the BIOS update.

And I alredy turned off hyper-v, not work... In the meantime I have re-enabled the hyper-v function and I use the Windows manager to virtualize

Perhaps one of the patches for Meltdown or Spectre is blocking virtualization. — Gerard H. Pille, May 27 '18 at 13:40
@GerardH.Pille Except those patches have literally nothing to do with VT-x — Ramhound, May 27 '18 at 13:45
@GerardH.Pille Meltdown and Spectre have nothing to do with virtualization. How I know isn’t relevant. — Ramhound, May 27 '18 at 14:22
Perhaps you'll accept someone else's word for it: "Oracle updates include the fix for the Spectre CVE-2017-5715 vulnerability affecting its Oracle X86 Servers and Oracle VM VirtualBox" (https://securityaffairs.co/wordpress/67855/security/oracle-january-2018-critical-patch.html) — Gerard H. Pille, May 27 '18 at 15:08
Is [this answer](https://superuser.com/a/1153493/327367) relevant to you? — AFH, May 28 '18 at 10:01
a friend of mine has the same PC as mine but no updates; I did the various tests and on its pc the CPU register bit is 5 and in fact "securable" in the hardware virtualization voice says yes so it's the BIOS update — V_Martusciello, May 28 '18 at 22:49
And I alredy turned off hyper-v, not work... In the meantime I have re-enabled the hyper-v function and I use the Windows manager to virtualize — V_Martusciello, May 28 '18 at 22:51
If you've enabled Hyper-V, that will cause any apps or Virtualbox to show that virtualization is disabled. After you enable Hyper-V, your host OS is moved into a VM and hardware virtualization isn't passed through. — essjae, Jun 06 '18 at 23:38
I activated hyper-v precisely because I can not use virtualbox. — V_Martusciello, Jun 08 '18 at 05:41

score 0 · Accepted Answer · answered Jan 08 '21 at 22:07

0

At the end, reinstalling windows solve the issue.

answered Jan 08 '21 at 22:07

V_Martusciello

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Virtualization does not work anymore

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