KVM: SVM: Add KVM_SEND_UPDATE_DATA command

KVM: SVM: Add KVM_SEND_UPDATE_DATA command

The command is used for encrypting the guest memory region using the encryption
context created with KVM_SEV_SEND_START.

Cc: Thomas Gleixner <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Paolo Bonzini <[email protected]>
Cc: Joerg Roedel <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Tom Lendacky <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Reviewed-by : Steve Rutherford <[email protected]>
Signed-off-by: Brijesh Singh <[email protected]>
Signed-off-by: Ashish Kalra <[email protected]>
Message-Id: <d6a6ea740b0c668b30905ae31eac5ad7da048bb3.1618498113[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>