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vhost-user-gpu: handle vhost-user-gpu features in a callback 

Fixes a deadlock where the backend calls QEMU, while QEMU also calls the
backend simultaneously, both ends waiting for each other.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20210204105232.834642-3-marcandre.lureau@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Marc-André Lureau 2021-02-04 14:52:14 +04:00 committed by Gerd Hoffmann
parent 326a51f32d
commit 1f83ea8dbd
2 changed files with 28 additions and 11 deletions
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37
contrib/vhost-user-gpu/vhost-user-gpu.c
View File

@ -124,7 +124,7 @@ source_wait_cb(gint fd, GIOCondition condition, gpointer user_data)
}
/* resume */
g->wait_ok = 0;
g->wait_in = 0;
vg_handle_ctrl(&g->dev.parent, 0);
return G_SOURCE_REMOVE;
@ -133,8 +133,8 @@ source_wait_cb(gint fd, GIOCondition condition, gpointer user_data)
void
vg_wait_ok(VuGpu *g)
{
assert(g->wait_ok == 0);
g->wait_ok = g_unix_fd_add(g->sock_fd, G_IO_IN | G_IO_HUP,
assert(g->wait_in == 0);
g->wait_in = g_unix_fd_add(g->sock_fd, G_IO_IN | G_IO_HUP,
source_wait_cb, g);
}
@ -270,7 +270,7 @@ vg_get_display_info(VuGpu *vg, struct virtio_gpu_ctrl_command *cmd)
.size = 0,
};
assert(vg->wait_ok == 0);
assert(vg->wait_in == 0);
vg_send_msg(vg, &msg, -1);
if (!vg_recv_msg(vg, msg.request, sizeof(dpy_info), &dpy_info)) {
@ -815,7 +815,7 @@ vg_handle_ctrl(VuDev *dev, int qidx)
size_t len;
for (;;) {
if (vg->wait_ok != 0) {
if (vg->wait_in != 0) {
return;
}
@ -969,18 +969,17 @@ vg_queue_set_started(VuDev *dev, int qidx, bool started)
}
}
static void
set_gpu_protocol_features(VuGpu *g)
static gboolean
protocol_features_cb(gint fd, GIOCondition condition, gpointer user_data)
{
VuGpu *g = user_data;
uint64_t u64;
VhostUserGpuMsg msg = {
.request = VHOST_USER_GPU_GET_PROTOCOL_FEATURES
};
assert(g->wait_ok == 0);
vg_send_msg(g, &msg, -1);
if (!vg_recv_msg(g, msg.request, sizeof(u64), &u64)) {
return;
return G_SOURCE_CONTINUE;
}
msg = (VhostUserGpuMsg) {
@ -989,6 +988,24 @@ set_gpu_protocol_features(VuGpu *g)
.payload.u64 = 0
};
vg_send_msg(g, &msg, -1);
g->wait_in = 0;
vg_handle_ctrl(&g->dev.parent, 0);
return G_SOURCE_REMOVE;
}
static void
set_gpu_protocol_features(VuGpu *g)
{
VhostUserGpuMsg msg = {
.request = VHOST_USER_GPU_GET_PROTOCOL_FEATURES
};
vg_send_msg(g, &msg, -1);
assert(g->wait_in == 0);
g->wait_in = g_unix_fd_add(g->sock_fd, G_IO_IN | G_IO_HUP,
protocol_features_cb, g);
}
static int

2
contrib/vhost-user-gpu/vugpu.h
View File

@ -118,7 +118,7 @@ typedef struct VuGpu {
int sock_fd;
int drm_rnode_fd;
GSource *renderer_source;
guint wait_ok;
guint wait_in;
bool virgl;
bool virgl_inited;