From: Marc-André Lureau <marcandre.lureau@redhat.com>
Date: Fri, 9 Oct 2015 15:17:22 +0000 (+0200)
Subject: vhost: document log resizing
X-Git-Tag: TizenStudio_2.0_p2.3.2~120^2~1^2~116^2~24
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=636f4dddfe48ccabaf5198bba440354d6a268d62;p=sdk%2Femulator%2Fqemu.git

vhost: document log resizing

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Tested-by: Thibaut Collet <thibaut.collet@6wind.com>
---

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);