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
