[libvirt] [RFC v2 14/16] qemu: build vhost-user-backend for vhost-user-gpu
From: Marc-André Lureau <marcandre.lureau(a)redhat.com>
Pass the vhost-user socket to a chardev, and associate a
vhost-user-backend with it for each vhost-user-gpu.
Signed-off-by: Marc-André Lureau <marcandre.lureau(a)redhat.com>
---
src/qemu/qemu_command.c | 50 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 50 insertions(+)
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 2f3bd2a98e..5d08ea7d50 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -4577,6 +4577,38 @@ qemuBuildVgaVideoCommand(virCommandPtr cmd,
}
+static char *
+qemuBuildVhostUserBackendStr(virDomainVideoDefPtr video,
+ virCommandPtr cmd,
+ char **chardev)
+{
+ virBuffer buf = VIR_BUFFER_INITIALIZER;
+
+ if (virAsprintf(chardev, "socket,id=chr-vu-%s,fd=%d",
+ video->info.alias, video->info.vhost_user_fd) < 0)
+ goto error;
+
+ virCommandPassFD(cmd, video->info.vhost_user_fd,
+ VIR_COMMAND_PASS_FD_CLOSE_PARENT);
+
+ video->info.vhost_user_fd = -1;
+
+ virBufferAsprintf(&buf,
"vhost-user-backend,id=vu-%s,chardev=chr-vu-%s",
+ video->info.alias, video->info.alias);
+
+ if (virBufferCheckError(&buf) < 0)
+ goto error;
+
+ return virBufferContentAndReset(&buf);
+
+error:
+ VIR_FREE(*chardev);
+ virBufferFreeAndReset(&buf);
+ return NULL;
+
+}
+
+
static int
qemuBuildVideoCommandLine(virCommandPtr cmd,
const virDomainDef *def,
@@ -4584,6 +4616,24 @@ qemuBuildVideoCommandLine(virCommandPtr cmd,
{
size_t i;
+ for (i = 0; i < def->nvideos; i++) {
+ char *optstr;
+ char *chardev = NULL;
+ virDomainVideoDefPtr video = def->videos[i];
+
+ if (video->type == VIR_DOMAIN_VIDEO_TYPE_VHOST_USER) {
+
+ if (!(optstr = qemuBuildVhostUserBackendStr(video, cmd, &chardev)))
+ return -1;
+
+ virCommandAddArgList(cmd, "-chardev", chardev, NULL);
+ virCommandAddArgList(cmd, "-object", optstr, NULL);
+
+ VIR_FREE(optstr);
+ VIR_FREE(chardev);
+ }
+ }
+
for (i = 0; i < def->nvideos; i++) {
char *str = NULL;
virDomainVideoDefPtr video = def->videos[i];
--
2.19.0.rc0.48.gb9dfa238d5