Re: [PATCH 36/44] KVM: x86: Do compatibility checks when onlining CPU

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To: Sean Christopherson <seanjc@xxxxxxxxxx>, Marc Zyngier <maz@xxxxxxxxxx>, Huacai Chen <chenhuacai@xxxxxxxxxx>, Aleksandar Markovic <aleksandar.qemu.devel@xxxxxxxxx>, Anup Patel <anup@xxxxxxxxxxxxxx>, Paul Walmsley <paul.walmsley@xxxxxxxxxx>, Palmer Dabbelt <palmer@xxxxxxxxxxx>, Albert Ou <aou@xxxxxxxxxxxxxxxxx>, Christian Borntraeger <borntraeger@xxxxxxxxxxxxx>, Janosch Frank <frankja@xxxxxxxxxxxxx>, Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx>, Matthew Rosato <mjrosato@xxxxxxxxxxxxx>, Eric Farman <farman@xxxxxxxxxxxxx>, Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
Subject: Re: [PATCH 36/44] KVM: x86: Do compatibility checks when onlining CPU
From: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Date: Thu, 3 Nov 2022 16:17:43 +0100
Cc: James Morse <james.morse@xxxxxxx>, Alexandru Elisei <alexandru.elisei@xxxxxxx>, Suzuki K Poulose <suzuki.poulose@xxxxxxx>, Oliver Upton <oliver.upton@xxxxxxxxx>, Atish Patra <atishp@xxxxxxxxxxxxxx>, David Hildenbrand <david@xxxxxxxxxx>, kvm@xxxxxxxxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, kvmarm@xxxxxxxxxxxxxxx, kvmarm@xxxxxxxxxxxxxxxxxxxxx, linux-mips@xxxxxxxxxxxxxxx, linuxppc-dev@xxxxxxxxxxxxxxxx, kvm-riscv@xxxxxxxxxxxxxxxxxxx, linux-riscv@xxxxxxxxxxxxxxxxxxx, linux-s390@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Isaku Yamahata <isaku.yamahata@xxxxxxxxx>, Fabiano Rosas <farosas@xxxxxxxxxxxxx>, Michael Ellerman <mpe@xxxxxxxxxxxxxx>, Chao Gao <chao.gao@xxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Yuan Yao <yuan.yao@xxxxxxxxx>
In-reply-to: <20221102231911.3107438-37-seanjc@google.com>
References: <20221102231911.3107438-1-seanjc@google.com> <20221102231911.3107438-37-seanjc@google.com>
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.4.0

On 11/3/22 00:19, Sean Christopherson wrote:

From: Chao Gao<chao.gao@xxxxxxxxx>

Do compatibility checks when enabling hardware to effectively add
compatibility checks when onlining a CPU.  Abort enabling, i.e. the
online process, if the (hotplugged) CPU is incompatible with the known
good setup.

This paragraph is not true with this patch being before "KVM: Rename andmove CPUHP_AP_KVM_STARTING to ONLINE section".


Paolo

Follow-Ups:
- Re: [PATCH 36/44] KVM: x86: Do compatibility checks when onlining CPU
  - From: Sean Christopherson

References:
- [PATCH 00/44] KVM: Rework kvm_init() and hardware enabling
  - From: Sean Christopherson
- [PATCH 36/44] KVM: x86: Do compatibility checks when onlining CPU
  - From: Sean Christopherson

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