linux-kernel - Re: [PATCH v9 03/19] vfio: platform: add the VFIO PLATFORM module to Kconfig

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Date:	Wed, 12 Nov 2014 10:57:23 +0100
From:	Antonios Motakis <a.motakis@...tualopensystems.com>
To:	Hongbo Zhang <hongbo.zhang@...aro.org>
Cc:	kvm-arm <kvmarm@...ts.cs.columbia.edu>,
	Linux IOMMU <iommu@...ts.linux-foundation.org>,
	Alex Williamson <alex.williamson@...hat.com>,
	Will Deacon <will.deacon@....com>,
	VirtualOpenSystems Technical Team <tech@...tualopensystems.com>,
	Christoffer Dall <christoffer.dall@...aro.org>,
	Eric Auger <eric.auger@...aro.org>,
	Kim Phillips <kim.phillips@...escale.com>,
	Marc Zyngier <marc.zyngier@....com>,
	open list <linux-kernel@...r.kernel.org>,
	"open list:VFIO DRIVER" <kvm@...r.kernel.org>
Subject: Re: [PATCH v9 03/19] vfio: platform: add the VFIO PLATFORM module to Kconfig

Hello Hongbo,

On Wed, Nov 12, 2014 at 10:52 AM, Hongbo Zhang <hongbo.zhang@...aro.org> wrote:
> On 28 October 2014 02:07, Antonios Motakis
> <a.motakis@...tualopensystems.com> wrote:
>>
>> Enable building the VFIO PLATFORM driver that allows to use Linux platform
>> devices with VFIO.
>>
>> Signed-off-by: Antonios Motakis <a.motakis@...tualopensystems.com>
>> ---
>>  drivers/vfio/Kconfig           | 1 +
>>  drivers/vfio/Makefile          | 1 +
>>  drivers/vfio/platform/Kconfig  | 9 +++++++++
>>  drivers/vfio/platform/Makefile | 4 ++++
>>  4 files changed, 15 insertions(+)
>>  create mode 100644 drivers/vfio/platform/Kconfig
>>  create mode 100644 drivers/vfio/platform/Makefile
>>
>> diff --git a/drivers/vfio/Kconfig b/drivers/vfio/Kconfig
>> index a0abe04..962fb80 100644
>> --- a/drivers/vfio/Kconfig
>> +++ b/drivers/vfio/Kconfig
>> @@ -27,3 +27,4 @@ menuconfig VFIO
>>           If you don't know what to do here, say N.
>>
>>  source "drivers/vfio/pci/Kconfig"
>> +source "drivers/vfio/platform/Kconfig"
>> diff --git a/drivers/vfio/Makefile b/drivers/vfio/Makefile
>> index 0b035b1..dadf0ca 100644
>> --- a/drivers/vfio/Makefile
>> +++ b/drivers/vfio/Makefile
>> @@ -3,3 +3,4 @@ obj-$(CONFIG_VFIO_IOMMU_TYPE1) += vfio_iommu_type1.o
>>  obj-$(CONFIG_VFIO_IOMMU_SPAPR_TCE) += vfio_iommu_spapr_tce.o
>>  obj-$(CONFIG_VFIO_SPAPR_EEH) += vfio_spapr_eeh.o
>>  obj-$(CONFIG_VFIO_PCI) += pci/
>> +obj-$(CONFIG_VFIO_PLATFORM) += platform/
>> diff --git a/drivers/vfio/platform/Kconfig b/drivers/vfio/platform/Kconfig
>> new file mode 100644
>> index 0000000..c51af17
>> --- /dev/null
>> +++ b/drivers/vfio/platform/Kconfig
>> @@ -0,0 +1,9 @@
>> +config VFIO_PLATFORM
>> +       tristate "VFIO support for platform devices"
>> +       depends on VFIO && EVENTFD && ARM
>
> Hi Antonios,
> Is this only for ARM? how about X86 and PowerPC?
> On Freescale's PowerPC platform, the IOMMU is called PAMU (Peripheral
> Access Management Unit), and I am trying to use this VFIO framework on
> it.
>

In principle it should be working on any platform with such devices;
as long as you have a VFIO IOMMU driver for the PAMU (on ARM we use
VFIO PLATFORM for the device, with VFIO IOMMU TYPE1 for the IOMMU).

So if you have a suitable IOMMU driver for your target, feel free to
test it, and let us know of the results.

>>
>> +       help
>> +         Support for platform devices with VFIO. This is required to make
>> +         use of platform devices present on the system using the VFIO
>> +         framework.
>> +
>> +         If you don't know what to do here, say N.
>> diff --git a/drivers/vfio/platform/Makefile b/drivers/vfio/platform/Makefile
>> new file mode 100644
>> index 0000000..279862b
>> --- /dev/null
>> +++ b/drivers/vfio/platform/Makefile
>> @@ -0,0 +1,4 @@
>> +
>> +vfio-platform-y := vfio_platform.o vfio_platform_common.o
>> +
>> +obj-$(CONFIG_VFIO_PLATFORM) += vfio-platform.o
>> --
>> 2.1.1
>>
>> --
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