Re: [PATCH] KVM: SEV: Enforce minimum GHCB version requirement for SEV-SNP guests

On Fri, Jul 11, 2025, Nikunj A Dadhania wrote:

Require a minimum GHCB version of 2 when starting SEV-SNP guests through KVM_SEV_INIT2. When a VMM attempts to start an SEV-SNP guest with an incompatible GHCB version (less than 2), reject the request early rather than allowing the guest to start with an incorrect protocol version and fail later.

What happens with ghcb_version==1? I.e. what failure occurs, and when?