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Date: Thu, 13 Jan 2022 22:19:21 +0000 From: Sean Christopherson <seanjc@...gle.com> To: Maxim Levitsky <mlevitsk@...hat.com> Cc: Chao Gao <chao.gao@...el.com>, Zeng Guang <guang.zeng@...el.com>, Tom Lendacky <thomas.lendacky@....com>, Paolo Bonzini <pbonzini@...hat.com>, Vitaly Kuznetsov <vkuznets@...hat.com>, Wanpeng Li <wanpengli@...cent.com>, Jim Mattson <jmattson@...gle.com>, Joerg Roedel <joro@...tes.org>, "kvm@...r.kernel.org" <kvm@...r.kernel.org>, Dave Hansen <dave.hansen@...ux.intel.com>, "Luck, Tony" <tony.luck@...el.com>, Kan Liang <kan.liang@...ux.intel.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, "H. Peter Anvin" <hpa@...or.com>, Kim Phillips <kim.phillips@....com>, Jarkko Sakkinen <jarkko@...nel.org>, Jethro Beekman <jethro@...tanix.com>, "Huang, Kai" <kai.huang@...el.com>, "x86@...nel.org" <x86@...nel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "Hu, Robert" <robert.hu@...el.com> Subject: Re: [PATCH v5 7/8] KVM: VMX: Update PID-pointer table entry when APIC ID is changed On Tue, Jan 11, 2022, Maxim Levitsky wrote: > Both Intel and AMD's PRM also state that changing APIC ID is implementation > dependent. > > I vote to forbid changing apic id, at least in the case any APIC acceleration > is used, be that APICv or AVIC. That has my vote as well. For IPIv in particular there's not much concern with backwards compability, i.e. we can tie the behavior to enable_ipiv.
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