Re: [Qemu-devel] [RFC PATCH 0/3] VFIO support for AMBA devices

[Eric Auger <eric.auger@linaro.org>]

On 12/17/2014 11:09 AM, Baptiste Reynal wrote:
> The following series add VFIO support for AMBA devices.
> 
> It introduces multiple compatible string support to deal with arm,primecell
> compatible string.
> 
> The VFIOPlatformDevice now checks for this string and performs amba specific
> operations if it is present (change path of the device, add clock in the fd).
> 
> This patch applies on top of http://git.linaro.org/people/eric.auger/qemu.git
> on branch vfio_integ_v9_rc6_official_dynsysbus_v6 for irqfd support.
> 
> TODO: The IRQ forwarding doesn't work.
> 
> The series has been tested using PL330 device, irq forwarding doesn't work.
> (The test hangs on the first IRQ).

Hi Baptiste,

If am not wrong your branch below does not contain the requested kernel
patches for both irqfd and forwarding. Please take the requested pieces
on my linux git:
last official one can be taken at
http://git.linaro.org/people/eric.auger/linux.git (branch 3.18-rc6-v10)
All the requested kernel dependencies are quoted in
http://lists.gnu.org/archive/html/qemu-devel/2014-11/msg04372.html. That
should help ;-)

Best Regards

Eric


> The test performed relies on a special guest kernel, which can be found here
> http://github.com/virtualopensystems/linux-kvm-arm.git on branch
> vfio-platform-v6-guide, with CONFIG_KVM, CONFIG_ARM_SMMU, CONFIG_PL330_DMA
> and CONFIG_VOSYS_DMATEST enabled.
> 
> Run qemu using this command:
> ./qemu-system-arm -M virt -m 512M -enable-kvm \
>         -device vfio-pl330,host="2c0a0000.dma",id=dma,x-irqfd=false,x-forward=false \
>         -append "earlyprintk console=ttyAMA0" \
>         -kernel zImage -nographic
> 
> Then run DMA test:
> mount -t debugfs none /sys/kernel/debug
> echo 1 > /sys/kernel/debug/vosys_dmatest/start
> 
> Results can be checked using dmesg.
> 
> Baptiste Reynal (3):
>   hw/vfio/sysbus-fdt: generic add_generic_fdt_node
>   hw/vfio: amba device support
>   hw/vfio: add pl330 device support
> 
>  hw/arm/sysbus-fdt.c           | 34 +++++++++++++++++++++++++++++-----
>  hw/vfio/Makefile.objs         |  1 +
>  hw/vfio/pl330.c               | 41 +++++++++++++++++++++++++++++++++++++++++
>  hw/vfio/platform.c            | 15 ++++++++++++---
>  include/hw/vfio/vfio-common.h |  1 +
>  include/hw/vfio/vfio-pl330.h  | 26 ++++++++++++++++++++++++++
>  6 files changed, 110 insertions(+), 8 deletions(-)
>  create mode 100644 hw/vfio/pl330.c
>  create mode 100644 include/hw/vfio/vfio-pl330.h
>