Since you did not specify a particular operating system or use case, I am assuming you are encountering these errors while setting up Type-1 hypervisors (like Proxmox or ESXi) or Android emulators on a consumer AMD Ryzen system.
AMD CPUInfo errors usually occur when software cannot detect mandatory processor capabilities. This is almost always caused by disabled firmware settings rather than hardware faults. 1. Enable AMD-V (SVM Mode)
Virtualization must be explicitly turned on in your motherboard firmware.
Locate the setting: Reboot and enter your BIOS (usually by tapping Del or F2).
Find the toggle: Navigate to Advanced CPU Configuration or MIT.
Enable SVM: Look for SVM Mode (Secure Virtual Machine) or AMD-V and switch it to Enabled. 2. Activate IOMMU for Passthrough
If you are passing hardware directly to virtual machines, IOMMU flags must be visible.
Find the option: Look under the Advanced or Northbridge chip configuration menu. Toggle IOMMU: Change IOMMU from Auto/Disabled to Enabled.
Enable Aer: Turn on PCIe ARI Support and AER Capability if they are listed nearby. 3. Clear OS-Level Hypervisor Conflicts
Windows Hyper-V can lock CPU flags, preventing other applications from reading CPUInfo correctly.
Open features: Type OptionalFeatures.exe in the Windows Run dialog (Win + R).
Uncheck Hyper-V: Deselect Hyper-V, Virtual Machine Platform, and Windows Hypervisor Platform.
Reboot system: Restart your PC to release the hardware flags to third-party software. 4. Inject Missing Kernel Flags (Linux/Proxmox)
If your BIOS is configured correctly but Linux diagnostics still show missing flags, manually force them via the bootloader.
Edit GRUB: Open terminal and run sudo nano /etc/default/grub.
Append parameters: Find the GRUB_CMDLINE_LINUX_DEFAULT line.
Add arguments: Inside the quotes, append amd_iommu=on iommu=pt.
Update configuration: Save the file and run sudo update-grub. 5. Flash the Latest Motherboard AGESA
Older BIOS versions have documented bugs where specific CPU flags (like AES or AVX) fail to report to the OS.
Check current version: Open msinfo32 in Windows to view your current BIOS date.
Download update: Visit your official motherboard manufacturer support page.
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