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Message-ID: <9c2fb3d0-2d69-20b9-589d-cc5ffc830f38@linux.intel.com>
Date: Thu, 11 Mar 2021 12:16:25 +0800
From: Zhu Lingshan <lingshan.zhu@...ux.intel.com>
To: Jason Wang <jasowang@...hat.com>,
Zhu Lingshan <lingshan.zhu@...el.com>, mst@...hat.com,
lulu@...hat.com, leonro@...dia.com
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH V3 6/6] vDPA/ifcvf: verify mandatory feature bits for vDPA
On 3/11/2021 11:20 AM, Jason Wang wrote:
>
> On 2021/3/10 5:00 下午, Zhu Lingshan wrote:
>> vDPA requres VIRTIO_F_ACCESS_PLATFORM as a must, this commit
>> examines this when set features.
>>
>> Signed-off-by: Zhu Lingshan <lingshan.zhu@...el.com>
>> ---
>> drivers/vdpa/ifcvf/ifcvf_base.c | 8 ++++++++
>> drivers/vdpa/ifcvf/ifcvf_base.h | 1 +
>> drivers/vdpa/ifcvf/ifcvf_main.c | 5 +++++
>> 3 files changed, 14 insertions(+)
>>
>> diff --git a/drivers/vdpa/ifcvf/ifcvf_base.c
>> b/drivers/vdpa/ifcvf/ifcvf_base.c
>> index ea6a78791c9b..58f47fdce385 100644
>> --- a/drivers/vdpa/ifcvf/ifcvf_base.c
>> +++ b/drivers/vdpa/ifcvf/ifcvf_base.c
>> @@ -224,6 +224,14 @@ u64 ifcvf_get_features(struct ifcvf_hw *hw)
>> return hw->hw_features;
>> }
>> +int ifcvf_verify_min_features(struct ifcvf_hw *hw)
>> +{
>> + if (!(hw->hw_features & BIT_ULL(VIRTIO_F_ACCESS_PLATFORM)))
>> + return -EINVAL;
>> +
>> + return 0;
>> +}
>> +
>> void ifcvf_read_net_config(struct ifcvf_hw *hw, u64 offset,
>> void *dst, int length)
>> {
>> diff --git a/drivers/vdpa/ifcvf/ifcvf_base.h
>> b/drivers/vdpa/ifcvf/ifcvf_base.h
>> index dbb8c10aa3b1..91c5735d4dc9 100644
>> --- a/drivers/vdpa/ifcvf/ifcvf_base.h
>> +++ b/drivers/vdpa/ifcvf/ifcvf_base.h
>> @@ -123,6 +123,7 @@ void io_write64_twopart(u64 val, u32 *lo, u32 *hi);
>> void ifcvf_reset(struct ifcvf_hw *hw);
>> u64 ifcvf_get_features(struct ifcvf_hw *hw);
>> u64 ifcvf_get_hw_features(struct ifcvf_hw *hw);
>> +int ifcvf_verify_min_features(struct ifcvf_hw *hw);
>> u16 ifcvf_get_vq_state(struct ifcvf_hw *hw, u16 qid);
>> int ifcvf_set_vq_state(struct ifcvf_hw *hw, u16 qid, u16 num);
>> struct ifcvf_adapter *vf_to_adapter(struct ifcvf_hw *hw);
>> diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c
>> b/drivers/vdpa/ifcvf/ifcvf_main.c
>> index 25fb9dfe23f0..f624f202447d 100644
>> --- a/drivers/vdpa/ifcvf/ifcvf_main.c
>> +++ b/drivers/vdpa/ifcvf/ifcvf_main.c
>> @@ -179,6 +179,11 @@ static u64 ifcvf_vdpa_get_features(struct
>> vdpa_device *vdpa_dev)
>> static int ifcvf_vdpa_set_features(struct vdpa_device *vdpa_dev,
>> u64 features)
>> {
>> struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
>> + int ret;
>> +
>> + ret = ifcvf_verify_min_features(vf);
>
>
> So this validate device features instead of driver which is the one we
> really want to check?
>
> Thanks
Hi Jason,
Here we check device feature bits to make sure the device support
ACCESS_PLATFORM. In get_features(),
it will return a intersection of device features bit and driver
supported features bits(which includes ACCESS_PLATFORM).
Other components like QEMU should not set features bits more than this
intersection of bits. so we can make sure if this
ifcvf_verify_min_features() passed, both device and driver support
ACCESS_PLATFORM.
Are you suggesting check driver feature bits in
ifcvf_verify_min_features() in the meantime as well?
Thanks!
>
>
>> + if (ret)
>> + return ret;
>> vf->req_features = features;
>
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> Virtualization@...ts.linux-foundation.org
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