[Qemu-devel] [PULL 15/38] vhost: document log resizing

[Michael S. Tsirkin]

From: Marc-André Lureau <address@hidden>

Signed-off-by: Marc-André Lureau <address@hidden>
Reviewed-by: Michael S. Tsirkin <address@hidden>
Signed-off-by: Michael S. Tsirkin <address@hidden>
Tested-by: Thibaut Collet <address@hidden>
---
 hw/virtio/vhost.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
index f14a5c5..f5ecaf0 100644
--- a/hw/virtio/vhost.c
+++ b/hw/virtio/vhost.c
@@ -350,6 +350,8 @@ static inline void vhost_dev_log_resize(struct vhost_dev* 
dev, uint64_t size)
     uint64_t log_base = (uintptr_t)log->log;
     int r;
 
+    /* inform backend of log switching, this must be done before
+       releasing the current log, to ensure no logging is lost */
     r = dev->vhost_ops->vhost_call(dev, VHOST_SET_LOG_BASE, &log_base);
     assert(r >= 0);
     vhost_log_put(dev, true);
-- 
MST