linux-kernel - Re: [PATCH v6 0/5] Add Guest API & Guest Kernel support for SEV live migration.

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Date:   Thu, 11 Nov 2021 13:43:34 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Ashish Kalra <Ashish.Kalra@....com>
Cc:     seanjc@...gle.com, tglx@...utronix.de, mingo@...hat.com,
        hpa@...or.com, joro@...tes.org, bp@...en8.de,
        Thomas.Lendacky@....com, x86@...nel.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, srutherford@...gle.com,
        brijesh.singh@....com, dovmurik@...ux.ibm.com, tobin@...ux.ibm.com,
        jejb@...ux.ibm.com, dgilbert@...hat.com
Subject: Re: [PATCH v6 0/5] Add Guest API & Guest Kernel support for SEV live
 migration.

On 8/24/21 13:03, Ashish Kalra wrote:
> adds guest api and guest kernel support for SEV live migration.
> 
> The patch series introduces a new hypercall. The guest OS can use this
> hypercall to notify the page encryption status. If the page is encrypted
> with guest specific-key then we use SEV command during the migration.
> If page is not encrypted then fallback to default. This new hypercall
> is invoked using paravirt_ops.
> 
> This section descibes how the SEV live migration feature is negotiated
> between the host and guest, the host indicates this feature support via
> KVM_FEATURE_CPUID. The guest firmware (OVMF) detects this feature and
> sets a UEFI enviroment variable indicating OVMF support for live
> migration, the guest kernel also detects the host support for this
> feature via cpuid and in case of an EFI boot verifies if OVMF also
> supports this feature by getting the UEFI enviroment variable and if it
> set then enables live migration feature on host by writing to a custom
> MSR, if not booted under EFI, then it simply enables the feature by
> again writing to the custom MSR.

Queued, thanks.

Paolo