linux-kernel - Re: [PATCH v3 08/10] KVM: nVMX: Switch to vmcs01 to update APIC page on-demand if L2 is active

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Message-ID: <aU3sdIMFi1iKvTYY@intel.com>
Date: Fri, 26 Dec 2025 10:01:24 +0800
From: Chao Gao <chao.gao@...el.com>
To: Sean Christopherson <seanjc@...gle.com>
CC: Paolo Bonzini <pbonzini@...hat.com>, <kvm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Dongli Zhang <dongli.zhang@...cle.com>
Subject: Re: [PATCH v3 08/10] KVM: nVMX: Switch to vmcs01 to update APIC page
 on-demand if L2 is active

On Fri, Dec 05, 2025 at 03:19:11PM -0800, Sean Christopherson wrote:
>If the KVM-owned APIC-access page is migrated while L2 is running,
>temporarily load vmcs01 and immediately update APIC_ACCESS_ADDR instead
>of deferring the update until the next nested VM-Exit.  Once changing
>the virtual APIC mode is converted to always do on-demand updates, all
>of the "defer until vmcs01 is active" logic will be gone.
>
>Signed-off-by: Sean Christopherson <seanjc@...gle.com>

Reviewed-by: Chao Gao <chao.gao@...el.com>