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

[Sean Christopherson]

On Mon, May 25, 2026, 张巍 wrote:
> 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.

No need, I just wanted to double check.  And this is already in Linus' tree,
commit 9a12fa5213cf ("KVM: SVM: Disable AVIC IPI virtualization on Hygon Family
18h (erratum #1235)"), so what I would have preferred is irrelevant :-)

Thanks for the follow-up!