Messages in this thread | | | Date | Thu, 11 Nov 2021 13:43:34 +0100 | Subject | Re: [PATCH v6 0/5] Add Guest API & Guest Kernel support for SEV live migration. | From | Paolo Bonzini <> |
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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
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