linux-kernel - Re: [PATCH v2 6/8] KVM: x86: Bug the VM if the emulator accesses a non-existent GPR

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Date:   Thu, 2 Jun 2022 16:01:25 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>
Cc:     Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.org>,
        Robert Dinse <nanook@...imo.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [PATCH v2 6/8] KVM: x86: Bug the VM if the emulator accesses a
 non-existent GPR

On Wed, Jun 01, 2022, Vitaly Kuznetsov wrote:
> >  static const struct x86_emulate_ops emulate_ops = {
> > +	.vm_bugged           = emulator_vm_bugged,
> >  	.read_gpr            = emulator_read_gpr,
> >  	.write_gpr           = emulator_write_gpr,
> >  	.read_std            = emulator_read_std,
> 
> Is it actually "vm_bugged" or "kvm_bugged"? :-)

vm_bugged.  KVM_BUG_ON() because it's a KVM bug on the condition, but the invididual
VM is what's bugged/dead, i.e. other VMs and thus KVM itself get to live on. :-)