Re: [Bug 221249] New: kvm_amd prints "CPU 1 isn't AMD or Hygon" on Intel Core Ultra (Arch Linux)

Sean Christopherson
2026-04-03T14:13:20Z

On Mon, Mar 16, 2026, bugzilla-daemon@kernel.org wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=221249
>
> Bug ID: 221249
> Summary: kvm_amd prints "CPU 1 isn't AMD or Hygon" on Intel
> Core Ultra (Arch Linux)
> Product: Virtualization
> Version: unspecified
> Hardware: Intel
> OS: Linux
> Status: NEW
> Severity: normal
> Priority: P3
> Component: kvm
> Assignee: virtualization_kvm@kernel-bugs.osdl.org
> Reporter: thisisamirv@gmail.com
> Regression: No
>
> Created attachment 309692
> --> https://bugzilla.kernel.org/attachment.cgi?id=309692&action=edit
> log
>
> I am observing the following kernel message on a Lenovo ThinkPad X9-14 Gen 1
> running Arch Linux on an Intel CPU:
>
> kvm_amd: CPU 1 isn't AMD or Hygon
>
> # System information
>
> Kernel: 6.19.6-arch1-1
> Distribution: Arch Linux

...

> kvm_amd: CPU 1 isn't AMD or Hygon
>
> * The system does not have an AMD CPU.
> * It appears the kvm_amd module may be probed or initialized briefly
> even on Intel systems.

This is highly unlikely to be an upstream kernel bug. The unwanted probing is
most likely coming from elsewhere. Given that the out-of-tree VirtualBox driver
loads shortly after the failed kvm_amd.ko load, my guess is that vboxdrv is the
culprit.

[ 3.087169] kvm_amd: CPU 1 isn't AMD or Hygon
[ 3.118021] vboxdrv: module uses symbol (cr4_read_shadow) from namespace module:kvm,kvm-amd,kvm-intel, but does not import it.
[ 3.118032] vboxdrv: module uses symbol (__flush_tlb_all) from namespace module:kvm,kvm-amd,kvm-intel, but does not import it.
[ 3.118063] vboxdrv: module uses symbol (cr4_update_irqsoff) from namespace module:kvm,kvm-amd,kvm-intel, but does not import it.
[ 3.124334] vboxdrv: Found 8 processor cores/threads
[ 3.152502] rtR0InitNative: g_pLnxInitMm=000000000ba3e8e7
[ 3.181635] vboxdrv: Found KVM hardware-virtualization symbols
[ 3.181638] vboxdrv: TSC mode is Invariant, tentative frequency 3302385743 Hz
[ 3.181641] vboxdrv: Successfully loaded version 7.2.6 r172322 (interface 0x00340002)

FWIW, attempting to load kvm_{amd,intel}.ko on the "wrong" CPU is benign other
than the error message.