Re: [PATCH] KVM: SVM: Disable AVIC IPI virtualization on Hygon Family 18h (erratum #1235)

[张巍]

On Fri, May 22, 2026, Sean Christopherson wrote:
> IIUC, family 18h is carved out entirely for Hygon, correct?  I.e.
> there's no risk of disabling IPI virtualization on unaffected AMD CPUs?

Yes, that is my understanding.

The original Hygon enablement [1] uses Family 18h together with the
HygonGenuine vendor ID to distinguish Hygon Dhyana from AMD Family 17h,
and explicitly states that only Hygon is expected to use Family 18h.  So
this should not affect unaffected AMD CPUs.

I can add an X86_VENDOR_HYGON check too if you prefer making the
dependency explicit.

[1] https://lwn.net/Articles/764481/

Thanks,
Tina