linux-kernel - Re: [PATCH V3 1/5] vhost: factor out IOTLB

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Date:   Thu, 20 Feb 2020 13:39:39 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Randy Dunlap <rdunlap@...radead.org>, mst@...hat.com,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Cc:     tiwei.bie@...el.com, jgg@...lanox.com, maxime.coquelin@...hat.com,
        cunming.liang@...el.com, zhihong.wang@...el.com,
        rob.miller@...adcom.com, xiao.w.wang@...el.com,
        haotian.wang@...ive.com, lingshan.zhu@...el.com,
        eperezma@...hat.com, lulu@...hat.com, parav@...lanox.com,
        kevin.tian@...el.com, stefanha@...hat.com, hch@...radead.org,
        aadam@...hat.com, jiri@...lanox.com, shahafs@...lanox.com,
        hanand@...inx.com, mhabets@...arflare.com
Subject: Re: [PATCH V3 1/5] vhost: factor out IOTLB


On 2020/2/20 下午12:04, Randy Dunlap wrote:
> On 2/19/20 7:56 PM, Jason Wang wrote:
>> This patch factors out IOTLB into a dedicated module in order to be
>> reused by other modules like vringh. User may choose to enable the
>> automatic retiring by specifying VHOST_IOTLB_FLAG_RETIRE flag to fit
>> for the case of vhost device IOTLB implementation.
>>
>> Signed-off-by: Jason Wang <jasowang@...hat.com>
>> ---
>>   MAINTAINERS                 |   1 +
>>   drivers/vhost/Kconfig       |   7 ++
>>   drivers/vhost/Makefile      |   2 +
>>   drivers/vhost/net.c         |   2 +-
>>   drivers/vhost/vhost.c       | 221 +++++++++++-------------------------
>>   drivers/vhost/vhost.h       |  36 ++----
>>   drivers/vhost/vhost_iotlb.c | 171 ++++++++++++++++++++++++++++
>>   include/linux/vhost_iotlb.h |  45 ++++++++
>>   8 files changed, 304 insertions(+), 181 deletions(-)
>>   create mode 100644 drivers/vhost/vhost_iotlb.c
>>   create mode 100644 include/linux/vhost_iotlb.h
>>
> Hi,
> Sorry if you have gone over this previously:


Thanks for the review, it's really helpful.


>
>> diff --git a/drivers/vhost/Kconfig b/drivers/vhost/Kconfig
>> index 3d03ccbd1adc..eef634ff9a6e 100644
>> --- a/drivers/vhost/Kconfig
>> +++ b/drivers/vhost/Kconfig
>> @@ -36,6 +36,7 @@ config VHOST_VSOCK
>>   
>>   config VHOST
>>   	tristate
>> +	select VHOST_IOTLB
>>   	---help---
>>   	  This option is selected by any driver which needs to access
>>   	  the core of vhost.
>> @@ -54,3 +55,9 @@ config VHOST_CROSS_ENDIAN_LEGACY
>>   	  adds some overhead, it is disabled by default.
>>   
>>   	  If unsure, say "N".
>> +
>> +config VHOST_IOTLB
>> +	tristate
>> +	default m
> "default m" should not be needed. Just make whatever needs it select it.


Yes, will fix.

Thanks


>
>> +	help
>> +	  Generic IOTLB implementation for vhost and vringh.
>