linux-kernel - Re: [PATCH 4/4] nvmx: check for shadow vmcs check on entry

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Message-ID: <e8599b66-a2b2-b27d-cfe4-95debb19a1ed@redhat.com>
Date:	Thu, 21 Jul 2016 11:16:24 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Bandan Das <bsd@...hat.com>, kvm@...r.kernel.org
Cc:	rkrcmar@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] nvmx: check for shadow vmcs check on entry



On 21/07/2016 00:25, Bandan Das wrote:
> vmentry should check whether the vmcs provided by
> the guest hypervisor is a shadow vmcs and fail.

How can this happen, since vmptrld checks the revision_id as you said below?

Paolo

> Also, vmptrld should check whether a shadow vmcs
> is being loaded by the guest without support being present
> but this check happens as part of checking the revision_id.