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Guest writes to vNVDIMM labels are intercepted and performed on the backend by QEMU. When the backend is a real persistent memort, QEMU needs to take proper operations to ensure its write persistence on the persistent memory. Otherwise, a host power failure may result in the loss of guest label configurations. Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Igor Mammedov <imammedo@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>