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configure: mark vhost-user Linux-only

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The vhost-user protocol uses the Linux eventfd feature and is typically
connected to Linux kvm.ko ioeventfd and irqfd file descriptors. The
protocol specification in docs/interop/vhost-user.rst does not describe
how platforms without eventfd support work.

The QEMU vhost-user devices compile on other POSIX host operating
systems because eventfd usage is abstracted in QEMU. The libvhost-user
programs in contrib/ do not compile but we failed to notice since they
are not built by default.

Make it clear that vhost-user is only supported on Linux for the time
being. If someone wishes to support it on other platforms then the
details can be added to vhost-user.rst and CI jobs can test the feature
to prevent bitrot.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20201110171121.1265142-4-stefanha@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2020-11-10 17:11:21 +00:00 committed by Michael S. Tsirkin
parent eb6a388624
commit d88618f717
1 changed files with 4 additions and 5 deletions
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9
configure vendored
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@ -328,7 +328,7 @@ vhost_net=""
vhost_crypto=""
vhost_scsi=""
vhost_vsock=""
vhost_user=""
vhost_user="no"
vhost_user_blk_server="auto"
vhost_user_fs=""
kvm="auto"
@ -718,7 +718,6 @@ fi
case $targetos in
MINGW32*)
mingw32="yes"
vhost_user="no"
audio_possible_drivers="dsound sdl"
if check_include dsound.h; then
audio_drv_list="dsound"
@ -797,6 +796,7 @@ Linux)
audio_possible_drivers="oss alsa sdl pa"
linux="yes"
linux_user="yes"
vhost_user="yes"
;;
esac
@ -2341,9 +2341,8 @@ fi
# vhost interdependencies and host support
# vhost backends
test "$vhost_user" = "" && vhost_user=yes
if test "$vhost_user" = "yes" && test "$mingw32" = "yes"; then
error_exit "vhost-user isn't available on win32"
if test "$vhost_user" = "yes" && test "$linux" != "yes"; then
error_exit "vhost-user is only available on Linux"
fi
test "$vhost_vdpa" = "" && vhost_vdpa=$linux
if test "$vhost_vdpa" = "yes" && test "$linux" != "yes"; then