linux-kernel - Re: [PATCH] vhost: drop vring dependency on iotlb

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Date:   Thu, 2 Apr 2020 22:59:49 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH] vhost: drop vring dependency on iotlb


On 2020/4/2 下午10:36, Michael S. Tsirkin wrote:
> On Thu, Apr 02, 2020 at 10:28:28PM +0800, Jason Wang wrote:
>> On 2020/4/2 下午10:12, Michael S. Tsirkin wrote:
>>> vringh can now be built without IOTLB.
>>> Select IOTLB directly where it's used.
>>>
>>> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
>>> ---
>>>
>>> This is on top of my previous patch (in vhost tree now).
>>>
>>>    drivers/vdpa/Kconfig  | 1 +
>>>    drivers/vhost/Kconfig | 1 -
>>>    2 files changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/vdpa/Kconfig b/drivers/vdpa/Kconfig
>>> index 7db1460104b7..08b615f2da39 100644
>>> --- a/drivers/vdpa/Kconfig
>>> +++ b/drivers/vdpa/Kconfig
>>> @@ -17,6 +17,7 @@ config VDPA_SIM
>>>    	depends on RUNTIME_TESTING_MENU
>>>    	select VDPA
>>>    	select VHOST_RING
>>> +	select VHOST_IOTLB
>>>    	default n
>>>    	help
>>>    	  vDPA networking device simulator which loop TX traffic back
>>> diff --git a/drivers/vhost/Kconfig b/drivers/vhost/Kconfig
>>> index 21feea0d69c9..bdd270fede26 100644
>>> --- a/drivers/vhost/Kconfig
>>> +++ b/drivers/vhost/Kconfig
>>> @@ -6,7 +6,6 @@ config VHOST_IOTLB
>>>    config VHOST_RING
>>>    	tristate
>>> -	select VHOST_IOTLB
>>>    	help
>>>    	  This option is selected by any driver which needs to access
>>>    	  the host side of a virtio ring.
>>
>> Do we need to mention driver need to select VHOST_IOTLB by itself here?
>>
>> Thanks
>>
> OK but I guess it's best to do it near where VHOST_IOTLB is defined.
> Like this?
>
>
> diff --git a/drivers/vhost/Kconfig b/drivers/vhost/Kconfig
> index bdd270fede26..ce51126f51e7 100644
> --- a/drivers/vhost/Kconfig
> +++ b/drivers/vhost/Kconfig
> @@ -3,6 +3,8 @@ config VHOST_IOTLB
>   	tristate
>   	help
>   	  Generic IOTLB implementation for vhost and vringh.
> +	  This option is selected by any driver which needs to support
> +	  an IOMMU in software.
>   
>   config VHOST_RING
>   	tristate
>

Yes, probably.

Thanks