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Re: [Qemu-devel] [PATCH 2/5] vhost-net-user: add stubs for when no virti
From: |
Philippe Mathieu-Daudé |
Subject: |
Re: [Qemu-devel] [PATCH 2/5] vhost-net-user: add stubs for when no virtio-net device is present |
Date: |
Mon, 26 Nov 2018 23:52:59 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.3.0 |
On 26/11/18 23:43, Michael S. Tsirkin wrote:
> On Mon, Nov 26, 2018 at 05:45:47PM +0100, Philippe Mathieu-Daudé wrote:
>> On 26/11/18 14:20, Paolo Bonzini wrote:
>>> hw/net/vhost_net.c needs functions that are declared in net/vhost-user.c:
>>> the
>>> vhost-user code is always compiled into QEMU, only the constructor
>>> net_init_vhost_user is unreachable. Also, net/vhost-user.c needs functions
>>> declared in hw/virtio/vhost-stub.c even if no virtio device exists.
>>>
>>> Break this dependency. First, add a minimal version of net/vhost-user.c,
>>> with no functionality and no dependency on vhost code. Second, #ifdef out
>>> the calls back to net/vhost-user.c from hw/net/vhost_net.c.
>>>
>>> Signed-off-by: Paolo Bonzini <address@hidden>
>>
>> Reviewed-by: Philippe Mathieu-Daudé <address@hidden>
>> Tested-by: Philippe Mathieu-Daudé <address@hidden>
>
> whic hosts/targets and how did you test exactly?
This series is a buildsys refactor; after reviewing I building tested
linux (KVM) and win32 (default, --enable-vhost-user,
--enable-vhost-kernel). I did not test on BSD.
I did not test the running vhost code, simply assumed linking is enough.
>
>>> ---
>>> configure | 2 +-
>>> hw/net/vhost_net.c | 4 ++++
>>> net/Makefile.objs | 4 +++-
>>> net/net.c | 2 +-
>>> net/vhost-user-stub.c | 23 +++++++++++++++++++++++
>>> 5 files changed, 32 insertions(+), 3 deletions(-)
>>> create mode 100644 net/vhost-user-stub.c
>>>
>>> diff --git a/configure b/configure
>>> index 0a3c6a7..cda17ef 100755
>>> --- a/configure
>>> +++ b/configure
>>> @@ -6513,7 +6513,7 @@ if test "$vhost_scsi" = "yes" ; then
>>> echo "CONFIG_VHOST_SCSI=y" >> $config_host_mak
>>> fi
>>> if test "$vhost_net" = "yes" -a "$vhost_user" = "yes"; then
>>> - echo "CONFIG_VHOST_NET_USED=y" >> $config_host_mak
>>> + echo "CONFIG_VHOST_NET_USER=y" >> $config_host_mak
>>> fi
>>> if test "$vhost_crypto" = "yes" ; then
>>> echo "CONFIG_VHOST_CRYPTO=y" >> $config_host_mak
>>> diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
>>> index b901306..fe6202a 100644
>>> --- a/hw/net/vhost_net.c
>>> +++ b/hw/net/vhost_net.c
>>> @@ -193,6 +193,7 @@ struct vhost_net *vhost_net_init(VhostNetOptions
>>> *options)
>>> }
>>>
>>> /* Set sane init value. Override when guest acks. */
>>> +#ifdef CONFIG_VHOST_USER
>>> if (net->nc->info->type == NET_CLIENT_DRIVER_VHOST_USER) {
>>> features = vhost_user_get_acked_features(net->nc);
>>> if (~net->dev.features & features) {
>>> @@ -202,6 +203,7 @@ struct vhost_net *vhost_net_init(VhostNetOptions
>>> *options)
>>> goto fail;
>>> }
>>> }
>>> +#endif
>>>
>>> vhost_net_ack_features(net, features);
>>>
>>> @@ -413,10 +415,12 @@ VHostNetState *get_vhost_net(NetClientState *nc)
>>> case NET_CLIENT_DRIVER_TAP:
>>> vhost_net = tap_get_vhost_net(nc);
>>> break;
>>> +#ifdef CONFIG_VHOST_NET_USER
>>> case NET_CLIENT_DRIVER_VHOST_USER:
>>> vhost_net = vhost_user_get_vhost_net(nc);
>>> assert(vhost_net);
>>> break;
>>> +#endif
>>> default:
>>> break;
>>> }
>>> diff --git a/net/Makefile.objs b/net/Makefile.objs
>>> index b2bf88a..df2b409 100644
>>> --- a/net/Makefile.objs
>>> +++ b/net/Makefile.objs
>>> @@ -3,7 +3,9 @@ common-obj-y += socket.o
>>> common-obj-y += dump.o
>>> common-obj-y += eth.o
>>> common-obj-$(CONFIG_L2TPV3) += l2tpv3.o
>>> -common-obj-$(CONFIG_POSIX) += vhost-user.o
>>> +common-obj-$(call land,$(CONFIG_VIRTIO_NET),$(CONFIG_VHOST_NET_USER)) +=
>>> vhost-user.o
>>> +common-obj-$(call land,$(call
>>> lnot,$(CONFIG_VIRTIO_NET)),$(CONFIG_VHOST_NET_USER)) += vhost-user-stub.o
>>> +common-obj-$(CONFIG_ALL) += vhost-user-stub.o
>>> common-obj-$(CONFIG_SLIRP) += slirp.o
>>> common-obj-$(CONFIG_VDE) += vde.o
>>> common-obj-$(CONFIG_NETMAP) += netmap.o
>>> diff --git a/net/net.c b/net/net.c
>>> index 07c194a..95a74ad 100644
>>> --- a/net/net.c
>>> +++ b/net/net.c
>>> @@ -955,7 +955,7 @@ static int (* const
>>> net_client_init_fun[NET_CLIENT_DRIVER__MAX])(
>>> [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge,
>>> #endif
>>> [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport,
>>> -#ifdef CONFIG_VHOST_NET_USED
>>> +#ifdef CONFIG_VHOST_NET_USER
>>> [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user,
>>> #endif
>>> #ifdef CONFIG_L2TPV3
>>> diff --git a/net/vhost-user-stub.c b/net/vhost-user-stub.c
>>> new file mode 100644
>>> index 0000000..52ab4e1
>>> --- /dev/null
>>> +++ b/net/vhost-user-stub.c
>>> @@ -0,0 +1,23 @@
>>> +/*
>>> + * vhost-user-stub.c
>>> + *
>>> + * Copyright (c) 2018 Red Hat, Inc.
>>> + *
>>> + * This work is licensed under the terms of the GNU GPL, version 2 or
>>> later.
>>> + * See the COPYING file in the top-level directory.
>>> + *
>>> + */
>>> +
>>> +#include "qemu/osdep.h"
>>> +#include "clients.h"
>>> +#include "net/vhost_net.h"
>>> +#include "net/vhost-user.h"
>>> +#include "qemu/error-report.h"
>>> +#include "qapi/error.h"
>>> +
>>> +int net_init_vhost_user(const Netdev *netdev, const char *name,
>>> + NetClientState *peer, Error **errp)
>>> +{
>>> + error_setg(errp, "vhost-user requires frontend driver virtio-net-*");
>>> + return -1;
>>> +}
>>>