linux-kernel - Re: [PATCH v13 02/22] vfio: VFIO based driver for Mediated devices

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Date:   Wed, 16 Nov 2016 20:35:55 +0530
From:   Kirti Wankhede <kwankhede@...dia.com>
To:     <alex.williamson@...hat.com>, <pbonzini@...hat.com>,
        <kraxel@...hat.com>, <cjia@...dia.com>, <qemu-devel@...gnu.org>,
        <kvm@...r.kernel.org>, <kevin.tian@...el.com>,
        <jike.song@...el.com>, <bjsdjshi@...ux.vnet.ibm.com>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v13 02/22] vfio: VFIO based driver for Mediated devices



On 11/16/2016 7:59 AM, Dong Jia Shi wrote:
> * Kirti Wankhede <kwankhede@...dia.com> [2016-11-15 20:59:45 +0530]:
> 
> Hi Kirti,
> 
>> vfio_mdev driver registers with mdev core driver.
>> mdev core driver creates mediated device and calls probe routine of
>> vfio_mdev driver for each device.
>> Probe routine of vfio_mdev driver adds mediated device to VFIO core module
>>
>> This driver forms a shim layer that pass through VFIO devices operations
>> to vendor driver for mediated devices.
>>
>> Signed-off-by: Kirti Wankhede <kwankhede@...dia.com>
>> Signed-off-by: Neo Jia <cjia@...dia.com>
>> Reviewed-by: Jike Song <jike.song@...el.com>
>>
>> Change-Id: I583f4734752971d3d112324d69e2508c88f359ec
>> ---
>>  drivers/vfio/mdev/Kconfig     |   7 ++
>>  drivers/vfio/mdev/Makefile    |   1 +
>>  drivers/vfio/mdev/mdev_core.c |  16 ++++-
>>  drivers/vfio/mdev/vfio_mdev.c | 148 ++++++++++++++++++++++++++++++++++++++++++
>>  4 files changed, 171 insertions(+), 1 deletion(-)
>>  create mode 100644 drivers/vfio/mdev/vfio_mdev.c
>>
>> diff --git a/drivers/vfio/mdev/Kconfig b/drivers/vfio/mdev/Kconfig
>> index 258481d65ebd..1aa0391d74f2 100644
>> --- a/drivers/vfio/mdev/Kconfig
>> +++ b/drivers/vfio/mdev/Kconfig
>> @@ -7,3 +7,10 @@ config VFIO_MDEV
>>  	  Provides a framework to virtualize devices.
>>
>>  	  If you don't know what do here, say N.
>> +
>> +config VFIO_MDEV_DEVICE
>> +	tristate "VFIO support for Mediated devices"
>                                    ^^^^^^^^^^^^^^^^
> 
>> +	depends on VFIO && VFIO_MDEV
>> +	default n
>> +	help
>> +	  VFIO based driver for mediated devices.
>                                 ^^^^^^^^^^^^^^^^
> nit:
> s/mediated/Mediated/
> 
> I saw in many places you use the term "Mediated device", so I guess this
> is what you preferred to name them.
> 
>> diff --git a/drivers/vfio/mdev/Makefile b/drivers/vfio/mdev/Makefile
>> index 31bc04801d94..fa2d5ea466ee 100644
>> --- a/drivers/vfio/mdev/Makefile
>> +++ b/drivers/vfio/mdev/Makefile
>> @@ -2,3 +2,4 @@
>>  mdev-y := mdev_core.o mdev_sysfs.o mdev_driver.o
>>
>>  obj-$(CONFIG_VFIO_MDEV) += mdev.o
>> +obj-$(CONFIG_VFIO_MDEV_DEVICE) += vfio_mdev.o
>> diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
>> index 613e8a8a3b2a..1e0714ebc56a 100644
>> --- a/drivers/vfio/mdev/mdev_core.c
>> +++ b/drivers/vfio/mdev/mdev_core.c
>> @@ -354,7 +354,21 @@ int mdev_device_remove(struct device *dev, bool force_remove)
>>
>>  static int __init mdev_init(void)
>>  {
>> -	return mdev_bus_register();
>> +	int ret;
>> +
>> +	ret = mdev_bus_register();
>> +	if (ret) {
>> +		pr_err("Failed to register mdev bus\n");
> If you want to report an error message here, you should do it in a
> previous patch where you introduce the call for mdev_bus_register.
> 

Removing this error message.

>> +		return ret;
>> +	}
>> +
>> +	/*
>> +	 * Attempt to load known vfio_mdev.  This gives us a working environment
>> +	 * without the user needing to explicitly load vfio_mdev driver.
>> +	 */
>> +	request_module_nowait("vfio_mdev");
>> +
>> +	return ret;
>>  }
>>
>>  static void __exit mdev_exit(void)
> [...]
> 
> Please:
> Reviewed-by: Dong Jia Shi <bjsdjshi@...ux.vnet.ibm.com>
> 

Thanks.