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由 Jiri Denemark 提交于
QEMU 4.0.0 and newer automatically drops caches at the end of migration. Let's check for this capability so that we can allow migration when disk cache is turned on. Signed-off-by: NJiri Denemark <jdenemar@redhat.com> Acked-By: NPeter Krempa <pkrempa@redhat.com>
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