Can't enable AMD-V in VirtualBox (hardware virtualization)

In the VM settings, the case VT-x / AMD-V is grey and I can't check it. Why ?

• I have a Windows 10 pro host (updated)
• I use Vbox 6.1 (the latest)
• SVM mode is enabled in my BIOS settings
• Windows task manager says virtualization is enabled in the performances tab
• AMD-V/Hyper-V Compatibility Checker says this machine is compatible with hyper-v
• In the windows features (enable or disable windows features...), hyper-v is disabled, containers is disabled, guarded host is disabled
• In the Windows defender settings, the core and memory isolation is disabled.
• I rebooted many times

Any idea ?

[EDIT 26/05/2020]

I forgot to say :

• I have a ryzen 5 3600x
• My motherboard is a MSI B450M PRO M2 MAX

[EDIT 2 26/05/2020]

In order to answer essjae comment :

I haven't got any 3rd party antivirus. I just use Windows defender.

When I run systeminfo, I get the message Hyper-V Requirements: A hypervisor has been detected. Features required for Hyper-V will not be displayed.. Considering this link, it would mean Hyper-v is already running. But I don't understand why, because when I go in Enable or disable Windows features, Hyper-v is unchecked ! (I rebooted many times).

Also, here is the output of coreinfo.exe (link)

> .\Coreinfo.exe
Coreinfo v3.5 - Dump information on system CPU and memory topology
Copyright (C) 2008-2020 Mark Russinovich
Sysinternals -
AMD Ryzen 5 3600 6-Core Processor
AMD64 Family 23 Model 113 Stepping 0, AuthenticAMD
Microcode signature: 00000000
HTT * Multicore
HYPERVISOR * Hypervisor is present
VMX - Supports Intel hardware-assisted virtualization
SVM - Supports AMD hardware-assisted virtualization
X64 * Supports 64-bit mode
SMX - Supports Intel trusted execution
SKINIT - Supports AMD SKINIT
NX * Supports no-execute page protection
SMEP * Supports Supervisor Mode Execution Prevention
SMAP * Supports Supervisor Mode Access Prevention
PAGE1GB * Supports 1 GB large pages
PAE * Supports > 32-bit physical addresses
PAT * Supports Page Attribute Table
PSE * Supports 4 MB pages
PSE36 * Supports > 32-bit address 4 MB pages
PGE * Supports global bit in page tables
SS - Supports bus snooping for cache operations
VME * Supports Virtual-8086 mode
RDWRFSGSBASE * Supports direct GS/FS base access
FPU * Implements i387 floating point instructions
MMX * Supports MMX instruction set
MMXEXT * Implements AMD MMX extensions
3DNOW - Supports 3DNow! instructions
3DNOWEXT - Supports 3DNow! extension instructions
SSE * Supports Streaming SIMD Extensions
SSE2 * Supports Streaming SIMD Extensions 2
SSE3 * Supports Streaming SIMD Extensions 3
SSSE3 * Supports Supplemental SIMD Extensions 3
SSE4a * Supports Streaming SIMDR Extensions 4a
SSE4.1 * Supports Streaming SIMD Extensions 4.1
SSE4.2 * Supports Streaming SIMD Extensions 4.2
AES * Supports AES extensions
AVX * Supports AVX instruction extensions
FMA * Supports FMA extensions using YMM state
MSR * Implements RDMSR/WRMSR instructions
MTRR * Supports Memory Type Range Registers
XSAVE * Supports XSAVE/XRSTOR instructions
OSXSAVE * Supports XSETBV/XGETBV instructions
RDRAND * Supports RDRAND instruction
RDSEED * Supports RDSEED instruction
CMOV * Supports CMOVcc instruction
CLFSH * Supports CLFLUSH instruction
CX8 * Supports compare and exchange 8-byte instructions
CX16 * Supports CMPXCHG16B instruction
BMI1 * Supports bit manipulation extensions 1
BMI2 * Supports bit manipulation extensions 2
ADX * Supports ADCX/ADOX instructions
DCA - Supports prefetch from memory-mapped device
F16C * Supports half-precision instruction
FXSR * Supports FXSAVE/FXSTOR instructions
FFXSR * Supports optimized FXSAVE/FSRSTOR instruction
MONITOR - Supports MONITOR and MWAIT instructions
MOVBE * Supports MOVBE instruction
ERMSB - Supports Enhanced REP MOVSB/STOSB
PCLMULDQ * Supports PCLMULDQ instruction
POPCNT * Supports POPCNT instruction
LZCNT * Supports LZCNT instruction
SEP * Supports fast system call instructions
LAHF-SAHF * Supports LAHF/SAHF instructions in 64-bit mode
HLE - Supports Hardware Lock Elision instructions
RTM - Supports Restricted Transactional Memory instructions
DE * Supports I/O breakpoints including CR4.DE
DTES64 - Can write history of 64-bit branch addresses
DS - Implements memory-resident debug buffer
DS-CPL - Supports Debug Store feature with CPL
PCID - Supports PCIDs and settable CR4.PCIDE
INVPCID - Supports INVPCID instruction
PDCM - Supports Performance Capabilities MSR
RDTSCP * Supports RDTSCP instruction
TSC * Supports RDTSC instruction
TSC-DEADLINE - Local APIC supports one-shot deadline timer
TSC-INVARIANT * TSC runs at constant rate
xTPR - Supports disabling task priority messages
EIST - Supports Enhanced Intel Speedstep
ACPI - Implements MSR for power management
TM - Implements thermal monitor circuitry
TM2 - Implements Thermal Monitor 2 control
APIC * Implements software-accessible local APIC
x2APIC - Supports x2APIC
CNXT-ID - L1 data cache mode adaptive or BIOS
MCE * Supports Machine Check, INT18 and CR4.MCE
MCA * Implements Machine Check Architecture
PBE - Supports use of FERR#/PBE# pin
PSN - Implements 96-bit processor serial number
PREFETCHW * Supports PREFETCHW instruction
Maximum implemented CPUID leaves: 0000000D (Basic), 8000001E (Extended).
Maximum implemented address width: 48 bits (virtual), 48 bits (physical).
Processor signature: 00870F10
Logical to Physical Processor Map:
**---------- Physical Processor 0 (Hyperthreaded)
--**-------- Physical Processor 1 (Hyperthreaded)
----**------ Physical Processor 2 (Hyperthreaded)
------**---- Physical Processor 3 (Hyperthreaded)
--------**-- Physical Processor 4 (Hyperthreaded)
----------** Physical Processor 5 (Hyperthreaded)
Logical Processor to Socket Map:
************ Socket 0
Logical Processor to NUMA Node Map:
************ NUMA Node 0
No NUMA nodes.
Logical Processor to Cache Map:
**---------- Data Cache 0, Level 1, 32 KB, Assoc 8, LineSize 64
**---------- Instruction Cache 0, Level 1, 32 KB, Assoc 8, LineSize 64
**---------- Unified Cache 0, Level 2, 512 KB, Assoc 8, LineSize 64
******------ Unified Cache 1, Level 3, 16 MB, Assoc 16, LineSize 64
--**-------- Data Cache 1, Level 1, 32 KB, Assoc 8, LineSize 64
--**-------- Instruction Cache 1, Level 1, 32 KB, Assoc 8, LineSize 64
--**-------- Unified Cache 2, Level 2, 512 KB, Assoc 8, LineSize 64
----**------ Data Cache 2, Level 1, 32 KB, Assoc 8, LineSize 64
----**------ Instruction Cache 2, Level 1, 32 KB, Assoc 8, LineSize 64
----**------ Unified Cache 3, Level 2, 512 KB, Assoc 8, LineSize 64
------**---- Data Cache 3, Level 1, 32 KB, Assoc 8, LineSize 64
------**---- Instruction Cache 3, Level 1, 32 KB, Assoc 8, LineSize 64
------**---- Unified Cache 4, Level 2, 512 KB, Assoc 8, LineSize 64
------****** Unified Cache 5, Level 3, 16 MB, Assoc 16, LineSize 64
--------**-- Data Cache 4, Level 1, 32 KB, Assoc 8, LineSize 64
--------**-- Instruction Cache 4, Level 1, 32 KB, Assoc 8, LineSize 64
--------**-- Unified Cache 6, Level 2, 512 KB, Assoc 8, LineSize 64
----------** Data Cache 5, Level 1, 32 KB, Assoc 8, LineSize 64
----------** Instruction Cache 5, Level 1, 32 KB, Assoc 8, LineSize 64
----------** Unified Cache 7, Level 2, 512 KB, Assoc 8, LineSize 64
Logical Processor to Group Map:
************ Group 0

[EDIT 3 26/05/2020]

As Ramhound asked in the comments section, here is a screenshot of the option I can't check.

Here is a picture of the SVM mode in my BIOS. Sorry for the bad quality.

I haven't got Github Desktop. I just use git bash.

You can find below a screenshot of my tasks manager.

Here is a screenshot of the windows features.

[EDIT 4 26/05/2020]

Here is the result of Get-WindowsOptionalFeature -Online -FeatureName *Hyper-V* :

> Get-WindowsOptionalFeature -Online -FeatureName *Hyper-V*
FeatureName : Microsoft-Hyper-V-All
DisplayName : Hyper-V
Description : Provides services and management tools for creating and running virtual machines and their resources.
RestartRequired : Possible
State : Disabled
CustomProperties :
FeatureName : Microsoft-Hyper-V
DisplayName : Hyper-V Platform
Description : Provides the services that you can use to create and manage virtual machines and their resources.
RestartRequired : Possible
State : Disabled
CustomProperties :
FeatureName : Microsoft-Hyper-V-Tools-All
DisplayName : Hyper-V Management Tools
Description : Includes GUI and command-line tools for managing Hyper-V.
RestartRequired : Possible
State : Disabled
CustomProperties :
FeatureName : Microsoft-Hyper-V-Management-PowerShell
DisplayName : Hyper-V Module for Windows PowerShell
Description : Includes Windows PowerShell cmdlets for managing Hyper-V.
RestartRequired : Possible
State : Disabled
CustomProperties :
FeatureName : Microsoft-Hyper-V-Hypervisor
DisplayName : Hyper-V Hypervisor
Description : Provides the Hyper-V Hypervisor.
RestartRequired : Possible
State : Disabled
CustomProperties :
FeatureName : Microsoft-Hyper-V-Services
DisplayName : Hyper-V Services
Description : Provides the services that you can use to create and manage virtual machines and their resources.
RestartRequired : Possible
State : Disabled
CustomProperties :
FeatureName : Microsoft-Hyper-V-Management-Clients
DisplayName : Hyper-V GUI Management Tools
Description : Includes the Hyper-V Manager snap-in and Virtual Machine Connection tool.
RestartRequired : Possible
State : Disabled
CustomProperties :

Here is the result of @(Get-Wmiobject Win32_ComputerSystem).HypervisorPresent :

> @(Get-Wmiobject Win32_ComputerSystem).HypervisorPresent
True

[EDIT 5 30/05/2020]

I tried to enable hw virt manually with the command .\VBoxManage.exe modifyvm "110-proxy-ub-2004" --nested-hw-virt on, but I get this error when I try to start the VM :

I'm still looking for a solution.

1 Answer

I finally found the answer. Even if Hyper-v was disabled in the Windows features, the service named HV Host Service was still running. I disabled all the Hyper-v services and now the option VT-x / AMD-V in the Vbox VM setting isn't grayed out anymore and my VM boots when I enable the option.