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The STIBP flag may be supported by the host KVM module, so QEMU can allow it to be configured manually, and it can be exposed to guests when using "-cpu host". No additional migration code is required because the whole contents of spec_ctrl is already migrated in the "cpu/spec_ctrl" section. Corresponding KVM patch was submitted at: https://lore.kernel.org/lkml/20181205191956.31480-1-ehabkost@redhat.com/ Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Message-Id: <20181210180250.31299-1-ehabkost@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>