Re: [PATCH 6.18.y] KVM: VMX: Update SVI during runtime APICv activation

[Sean Christopherson]

On Fri, Jun 12, 2026, Jon Kohler wrote:
> From: Dongli Zhang <dongli.zhang@xxxxxxxxxx>
> 
> commit b2849bec936be642b5420801f902337f2507648e upstream.

...

> Signed-off-by: Dongli Zhang <dongli.zhang@xxxxxxxxxx>
> Reviewed-by: Chao Gao <chao.gao@xxxxxxxxx>
> Link: https://patch.msgid.link/20251110063212.34902-1-dongli.zhang@xxxxxxxxxx
> [sean: call out that SVM writes vmcb01 directly, tweak comment]
> Link: https://patch.msgid.link/20251205231913.441872-2-seanjc@xxxxxxxxxx
> Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
> (cherry picked from commit b2849bec936be642b5420801f902337f2507648e)
> Cc: stable@xxxxxxxxxxxxxxx # 6.6.x and above
> Cc: Gulshan Gabel <gulshan.gabel@xxxxxxxxxxx>
> Signed-off-by: Jon Kohler <jon@xxxxxxxxxxx>
> ---
> 
> This issue is pervasive and has been observed in production with QEMU
> as the VMM. One scenario where this occurs is with Windows guests that
> use the AutoEOI feature, which inhibits APICv
> (APICV_INHIBIT_REASON_HYPERV).

Gah, sorry, my bad.  I don't know why I didn't tag this for stable@.

Acked-by: Sean Christopherson <seanjc@xxxxxxxxxx>