Re: [Qemu-devel] [RESEND PATCH v5 4/4] vfio: Enable vfio-pci and mark supported

[Anthony Liguori <aliguori@us.ibm.com>]

Alex Williamson <alex.williamson@redhat.com> writes:

> Enabled for all softmmu guests supporting PCI on Linux hosts.  Note
> that currently only x86 hosts have the kernel side VFIO IOMMU support
> for this.  PPC (g3beige) is the only non-x86 guest known to work.
> ARM (veratile) hangs in firmware, others untested.
>
> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
> Acked-by: Michael S. Tsirkin <mst@redhat.com>
> ---
>
>  MAINTAINERS      |    5 +++++
>  configure        |    6 ++++++
>  hw/Makefile.objs |    3 ++-
>  3 files changed, 13 insertions(+), 1 deletion(-)
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 25733fc..29aac4f 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -474,6 +474,11 @@ M: Gerd Hoffmann <kraxel@redhat.com>
>  S: Maintained
>  F: hw/usb*
>  
> +VFIO
> +M: Alex Williamson <alex.williamson@redhat.com>
> +S: Supported
> +F: hw/vfio*
> +
>  vhost
>  M: Michael S. Tsirkin <mst@redhat.com>
>  S: Supported
> diff --git a/configure b/configure
> index 1b86517..c2c0d4f 100755
> --- a/configure
> +++ b/configure
> @@ -165,6 +165,7 @@ attr=""
>  libattr=""
>  xfs=""
>  
> +vfio_pci="no"
>  vhost_net="no"
>  kvm="no"
>  gprof="no"
> @@ -509,6 +510,7 @@ Haiku)
>    usb="linux"
>    kvm="yes"
>    vhost_net="yes"
> +  vfio_pci="yes"
>    if [ "$cpu" = "i386" -o "$cpu" = "x86_64" ] ; then
>      audio_possible_drivers="$audio_possible_drivers fmod"
>    fi
> @@ -3174,6 +3176,7 @@ echo "libiscsi support  $libiscsi"
>  echo "build guest agent $guest_agent"
>  echo "seccomp support   $seccomp"
>  echo "coroutine backend $coroutine_backend"
> +echo "VFIO PCI support  $vfio_pci"
>  
>  if test "$sdl_too_old" = "yes"; then
>  echo "-> Your SDL version is too old - please upgrade to have SDL support"
> @@ -3911,6 +3914,9 @@ if test "$target_softmmu" = "yes" ; then
>    if test "$smartcard_nss" = "yes" ; then
>      echo "subdir-$target: subdir-libcacard" >> $config_host_mak
>    fi
> +  if test "$vfio_pci" = "yes" ; then
> +    echo "CONFIG_VFIO_PCI=y" >> $config_target_mak
> +  fi
>    case "$target_arch2" in
>      i386|x86_64)
>        echo "CONFIG_HAVE_CORE_DUMP=y" >> $config_target_mak
> diff --git a/hw/Makefile.objs b/hw/Makefile.objs
> index 6dfebd2..7f8d3e4 100644
> --- a/hw/Makefile.objs
> +++ b/hw/Makefile.objs
> @@ -198,7 +198,8 @@ obj-$(CONFIG_VGA) += vga.o
>  obj-$(CONFIG_SOFTMMU) += device-hotplug.o
>  obj-$(CONFIG_XEN) += xen_domainbuild.o xen_machine_pv.o
>  
> -# Inter-VM PCI shared memory
> +# Inter-VM PCI shared memory & VFIO PCI device assignment
>  ifeq ($(CONFIG_PCI), y)
>  obj-$(CONFIG_KVM) += ivshmem.o
> +obj-$(CONFIG_VFIO_PCI) += vfio_pci.o

Why not just make this

obj-$(CONFIG_LINUX) += vfio_pci.o

?

All you're doing in configure is setting CONFIG_VFIO_PCI if
CONFIG_LINUX.

Regards,

Anthony Liguori

>  endif
>
> --
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