linux-kernel - Re: [PATCH 1/6] KVM: nSVM: Check the value written to MSR_VM_HSAVE

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Message-ID: <67e2e6b4fcbc2ec0bdda1e1af1cfe61d3c1fde6f.camel@redhat.com>
Date:   Fri, 09 Jul 2021 09:08:43 +0300
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>, kvm@...r.kernel.org
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Cathy Avery <cavery@...hat.com>,
        Emanuele Giuseppe Esposito <eesposit@...hat.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Michael Roth <mdroth@...ux.vnet.ibm.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] KVM: nSVM: Check the value written to
 MSR_VM_HSAVE_PA

On Thu, 2021-07-08 at 19:27 +0200, Paolo Bonzini wrote:
> On 07/07/21 12:28, Maxim Levitsky wrote:
> > Minor nitpick: I would have checked the host provided value as well,
> > just in case since there is no reason why it won't pass the same check,
> > and fail if the value is not aligned.
> 
> The reason not to do so is that it would allow a guest running an old 
> kernel to defeat live migration.
I understand now, and I will keep this in mind next time.

Best regards,
	Maxim Levitsky

> 
> Paolo
> 
> > Other than that:
> > Reviewed-by: Maxim Levitsky<mlevitsk@...hat.com>