linux-kernel - Re: [PATCH v4 09/26] KVM: Do processor compatibility check on resume

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Date:   Fri, 9 Sep 2022 10:15:16 +0800
From:   Chao Gao <chao.gao@...el.com>
To:     <isaku.yamahata@...el.com>
CC:     <linux-kernel@...r.kernel.org>, <kvm@...r.kernel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Marc Zyngier <maz@...nel.org>, Will Deacon <will@...nel.org>,
        Yuan Yao <yuan.yao@...ux.intel.com>,
        <isaku.yamahata@...il.com>, Kai Huang <kai.huang@...el.com>,
        Atish Patra <atishp@...shpatra.org>,
        Shaokun Zhang <zhangshaokun@...ilicon.com>,
        Qi Liu <liuqi115@...wei.com>,
        John Garry <john.garry@...wei.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        "Huang Ying" <ying.huang@...el.com>,
        Huacai Chen <chenhuacai@...nel.org>
Subject: Re: [PATCH v4 09/26] KVM: Do processor compatibility check on resume

On Thu, Sep 08, 2022 at 04:25:25PM -0700, isaku.yamahata@...el.com wrote:
>From: Isaku Yamahata <isaku.yamahata@...el.com>
>
>So far the processor compatibility check is not done on resume. It should
>be done.  The resume is called for resuming from S3/S4.  CPUs can be
>replaced or the kernel can resume from S4 on a different machine.  So

Are they valid cases handled by other kernel components? Trying to
handle them in KVM only doesn't help as kernel is likely to fail
somewhere else.