[dpdk-dev] [PATCH v4 7/8] virtio: add 1.0 support

[Xie, Huawei]

On 1/19/2016 3:44 PM, Xie, Huawei wrote:
> On 1/19/2016 1:53 PM, Yuanhan Liu wrote:
>> On Mon, Jan 18, 2016 at 04:50:16PM +0000, Xie, Huawei wrote:
>>> On 1/15/2016 12:34 PM, Yuanhan Liu wrote:
>>>> -static void
>>>> +static int
>>>>  virtio_negotiate_features(struct virtio_hw *hw)
>>>>  {
>>>>  	uint64_t host_features;
>>>> @@ -949,6 +949,22 @@ virtio_negotiate_features(struct virtio_hw *hw)
>>>>  	hw->guest_features = vtpci_negotiate_features(hw, host_features);
>>> Here if we are not modern device, we should remove VIRTIO_F_VERSION_1 in
>>> guest features.
>> VIRTIO_F_VERSION_1 should not be set for legacy virtio device at all.
> Yes, but here this patch sets this VIRTIO_F_VERSION_1 feature even for
> legacy virtio device.
> It doesn't cause issues, but better remove it for legacy virtio device.

OK, I see the legacy_get_features return a 32bit value which masks the
higher bits which contains the host VIRTIO_F_VERSION_1 feature. This is
very implict.

>> 	--yliu 
>>
>