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Add "do no harm" testing of EFER, CR0, CR4, and CR8 for SEV+ guests to verify that the guest can read and write the registers, without hitting e.g. a #VC on SEV-ES guests due to KVM incorrectly trying to intercept a register. Signed-off-by: Sean Christopherson <seanjc@google.com> Message-ID: <20260310211841.2552361-3-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>