[PULL 60/91] hw/virtio: add vhost_user_[read|write] trace points

[Michael S. Tsirkin]

From: Alex Bennée <alex.bennee@linaro.org>

These are useful when trying to debug the initial vhost-user
negotiation, especially when it hard to get logging from the low level
library on the other side.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

Message-Id: <20220321153037.3622127-4-alex.bennee@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 hw/virtio/vhost-user.c | 4 ++++
 hw/virtio/trace-events | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c
index afd51f79b3..6c8f722262 100644
--- a/hw/virtio/vhost-user.c
+++ b/hw/virtio/vhost-user.c
@@ -489,6 +489,8 @@ static int vhost_user_write(struct vhost_dev *dev, 
VhostUserMsg *msg,
         return ret < 0 ? -saved_errno : -EIO;
     }
 
+    trace_vhost_user_write(msg->hdr.request, msg->hdr.flags);
+
     return 0;
 }
 
@@ -542,6 +544,8 @@ static int vhost_user_set_log_base(struct vhost_dev *dev, 
uint64_t base,
         }
     }
 
+    trace_vhost_user_read(msg.hdr.request, msg.hdr.flags);
+
     return 0;
 }
 
diff --git a/hw/virtio/trace-events b/hw/virtio/trace-events
index 7a6576d833..65e3b704ec 100644
--- a/hw/virtio/trace-events
+++ b/hw/virtio/trace-events
@@ -21,6 +21,8 @@ vhost_user_set_mem_table_withfd(int index, const char *name, 
uint64_t memory_siz
 vhost_user_postcopy_waker(const char *rb, uint64_t rb_offset) "%s + 0x%"PRIx64
 vhost_user_postcopy_waker_found(uint64_t client_addr) "0x%"PRIx64
 vhost_user_postcopy_waker_nomatch(const char *rb, uint64_t rb_offset) "%s + 
0x%"PRIx64
+vhost_user_read(uint32_t req, uint32_t flags) "req:%d flags:0x%"PRIx32""
+vhost_user_write(uint32_t req, uint32_t flags) "req:%d flags:0x%"PRIx32""
 
 # vhost-vdpa.c
 vhost_vdpa_dma_map(void *vdpa, int fd, uint32_t msg_type, uint64_t iova, 
uint64_t size, uint64_t uaddr, uint8_t perm, uint8_t type) "vdpa:%p fd: %d 
msg_type: %"PRIu32" iova: 0x%"PRIx64" size: 0x%"PRIx64" uaddr: 0x%"PRIx64" 
perm: 0x%"PRIx8" type: %"PRIu8
-- 
MST