linux-kernel - Re: [RFC PATCH v2 18/69] KVM: Export kvm_make_all_cpus_request() for use in marking VMs as bugged

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Message-ID: <f70c6603-a6af-9090-68e7-d9238a9b1054@redhat.com>
Date:   Tue, 6 Jul 2021 15:47:31 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     isaku.yamahata@...el.com, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, erdemaktas@...gle.com,
        Connor Kuehl <ckuehl@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     isaku.yamahata@...il.com,
        Sean Christopherson <sean.j.christopherson@...el.com>
Subject: Re: [RFC PATCH v2 18/69] KVM: Export kvm_make_all_cpus_request() for
 use in marking VMs as bugged

On 03/07/21 00:04, isaku.yamahata@...el.com wrote:
> From: Sean Christopherson <sean.j.christopherson@...el.com>
> 
> Export kvm_make_all_cpus_request() and hoist the request helper
> declarations of request up to the KVM_REQ_* definitions in preparation
> for adding a "VM bugged" framework.  The framework will add KVM_BUG()
> and KVM_BUG_ON() as alternatives to full BUG()/BUG_ON() for cases where
> KVM has definitely hit a bug (in itself or in silicon) and the VM is all
> but guaranteed to be hosed.  Marking a VM bugged will trigger a request
> to all vCPUs to allow arch code to forcefully evict each vCPU from its
> run loop.
> 
> Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
> Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>

This should be _before_ patch 17, not after.

Paolo