linux-kernel - Re: [PATCH 2/3 V2] KVM, SEV: Add support for SEV intra host migration

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Date:   Wed, 14 Jul 2021 14:22:15 -0500
From:   Brijesh Singh <brijesh.singh@....com>
To:     Peter Gonda <pgonda@...gle.com>
Cc:     brijesh.singh@....com, Lars Bull <larsbull@...gle.com>,
        Marc Orr <marcorr@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        David Rientjes <rientjes@...gle.com>,
        "Dr . David Alan Gilbert" <dgilbert@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3 V2] KVM, SEV: Add support for SEV intra host migration



On 7/14/21 11:01 AM, Peter Gonda wrote:
> For SEV to work with intra host migration, contents of the SEV info struct
> such as the ASID (used to index the encryption key in the AMD SP) and
> the list of memory regions need to be transferred to the target VM.
> This change adds commands for sending and receiving the sev info.
> 
> To avoid exposing this internal state to userspace and prevent other
> processes from importing state they shouldn't have access to, the send
> returns a token to userspace that is handed off to the target VM. The
> target passes in this token to receive the sent state. The token is only
> valid for one-time use. Functionality on the source becomes limited
> after send has been performed. If the source is destroyed before the
> target has received, the token becomes invalid.
> 
> The target is expected to be initialized (sev_guest_init), but not
> launched state (sev_launch_start) when performing receive. Once the
> target has received, it will be in a launched state and will not
> need to perform the typical SEV launch commands.
> 
> Co-developed-by: Lars Bull <larsbull@...gle.com>
> Signed-off-by: Lars Bull <larsbull@...gle.com>
> Signed-off-by: Peter Gonda <pgonda@...gle.com>
> Reviewed-by: Marc Orr <marcorr@...gle.com>
> Cc: Paolo Bonzini <pbonzini@...hat.com>
> Cc: Sean Christopherson <seanjc@...gle.com>
> Cc: David Rientjes <rientjes@...gle.com>
> Cc: Dr. David Alan Gilbert <dgilbert@...hat.com>
> Cc: Brijesh Singh <brijesh.singh@....com>
> Cc: Vitaly Kuznetsov <vkuznets@...hat.com>
> Cc: Wanpeng Li <wanpengli@...cent.com>
> Cc: Jim Mattson <jmattson@...gle.com>
> Cc: Joerg Roedel <joro@...tes.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Borislav Petkov <bp@...en8.de>
> Cc: "H. Peter Anvin" <hpa@...or.com>
> Cc: kvm@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org

Reviewed-by: Brijesh Singh <brijesh.singh@....com>

thanks