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

[Alex Williamson <alex.williamson@redhat.com>]

On Wed, 2012-09-26 at 11:41 -0500, Anthony Liguori wrote:
> Alex Williamson <alex.williamson@redhat.com> writes:
> 
> > On Wed, 2012-09-26 at 08:50 -0500, Anthony Liguori wrote:
> >> 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.
> >
> > Ok.  I thought I needed linux + softmmu + pci, but maybe the softmmu is
> > implied with CONFIG_PCI?  Thanks,
> 
> obj-y is only used for softmmu so your covered.

Great, I'll make the change.  Thanks,

Alex