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Exit to userspace with -EFAULT / KVM_EXIT_MEMORY_FAULT if a private fault triggers emulation of any kind, as KVM doesn't currently support emulating access to guest private memory. Practically speaking, private faults and emulation are already mutually exclusive, but there are many flow that can result in KVM returning RET_PF_EMULATE, and adding one last check to harden against weird, unexpected combinations and/or KVM bugs is inexpensive. Suggested-by: Yan Zhao <yan.y.zhao@intel.com> Signed-off-by: Sean Christopherson <seanjc@google.com> Message-ID: <20240228024147.41573-2-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>