linux-kernel - Re: [PATCH 12/21] vhost-vdpa: introduce uAPI to get the number of virtqueue groups

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Date:   Thu, 31 Dec 2020 10:36:58 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Eli Cohen <elic@...dia.com>
Cc:     mst@...hat.com, eperezma@...hat.com, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, lulu@...hat.com, eli@...lanox.com,
        lingshan.zhu@...el.com, rob.miller@...adcom.com,
        stefanha@...hat.com, sgarzare@...hat.com
Subject: Re: [PATCH 12/21] vhost-vdpa: introduce uAPI to get the number of
 virtqueue groups


On 2020/12/30 下午6:05, Eli Cohen wrote:
> On Wed, Dec 16, 2020 at 02:48:09PM +0800, Jason Wang wrote:
>> Follows the vDPA support for multiple address spaces, this patch
>> introduce uAPI for the userspace to know the number of virtqueue
>> groups supported by the vDPA device.
>>
>> Signed-off-by: Jason Wang<jasowang@...hat.com>
>> ---
>>   drivers/vhost/vdpa.c       | 4 ++++
>>   include/uapi/linux/vhost.h | 3 +++
>>   2 files changed, 7 insertions(+)
>>
>> diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
>> index 060d5b5b7e64..1ba5901b28e7 100644
>> --- a/drivers/vhost/vdpa.c
>> +++ b/drivers/vhost/vdpa.c
>> @@ -536,6 +536,10 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep,
>>   	case VHOST_VDPA_GET_VRING_NUM:
>>   		r = vhost_vdpa_get_vring_num(v, argp);
>>   		break;
>> +	case VHOST_VDPA_GET_GROUP_NUM:
>> +		r = copy_to_user(argp, &v->vdpa->ngroups,
>> +				 sizeof(v->vdpa->ngroups));
>> +		break;
> Is this and other ioctls already supported in qemu?


Not yet, the prototype is under development.

I test the series with a small and dedicated userspace program.

Thanks


>