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From: Jason Wang <jasowang@redhat.com>
Message-ID: <4e786e43-4ef0-f463-5be4-7d264d6d35be@redhat.com>
Date: Tue, 19 Feb 2019 21:33:40 +0800
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Subject: Re: [Qemu-devel] [PATCH v4 11/11] virtio: CLI and provide packed
 ring feature bit by default
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To: Wei Xu <wexu@redhat.com>
Cc: qemu-devel@nongnu.org, maxime.coquelin@redhat.com, jfreiman@redhat.com, tiwei.bie@intel.com, mst@redhat.com


On 2019/2/19 =E4=B8=8B=E5=8D=887:23, Wei Xu wrote:
> On Tue, Feb 19, 2019 at 03:32:19PM +0800, Jason Wang wrote:
>> On 2019/2/14 =E4=B8=8B=E5=8D=8812:26,wexu@redhat.com  wrote:
>>> From: Wei Xu<wexu@redhat.com>
>>>
>>> Add userspace and vhost kernel/user support.
>>>
>>> Add CLI "ring_packed=3Dtrue/false" to enable/disable packed ring prov=
ision.
>>> Usage:
>>>      -device virtio-net-pci,netdev=3Dxx,mac=3Dxx:xx:xx:xx:xx:xx,ring_=
packed=3Dfalse
>>>
>>> By default it is provided.
>> Please compat this for old machine types.
> It is provided by default, how to make it compatible for old machine ty=
pes?
> Hide or provide it?
>
> Wei
>

Take a look at e.g how pc_compat_3_1 and hw_compat_3_1 was used.

Thanks