From f86c044ae075d142e658e866572eb0a37ecad2e1 Mon Sep 17 00:00:00 2001

From: Alon Levy <alevy@redhat.com>

Date: Thu, 22 Jul 2010 00:21:18 +0300

Subject: [PATCH 29/39] spice-vmc: split vmc_write to max sized virtio_serial_write calls

workaround for current windows driver limitation (RHBZ 617000)

---

 hw/spice-vmc.c |   21 ++++++++++++++++++---

 1 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/hw/spice-vmc.c b/hw/spice-vmc.c

index 041f243..b9d64a2 100644

--- a/hw/spice-vmc.c

+++ b/hw/spice-vmc.c

@@ -21,6 +21,8 @@

 #define VMC_GUEST_DEVICE_NAME "com.redhat.spice.0"

 #define VMC_DEVICE_NAME       "spicevmc"

+#define VMC_MAX_HOST_WRITE    2048

+

 #define dprintf(_svc, _level, _fmt, ...)                                \

     do {                                                                \

         static unsigned __dprintf_counter = 0;                          \

@@ -43,10 +45,23 @@ typedef struct SpiceVirtualChannel {

 static int vmc_write(SpiceVDIPortInstance *sin, const uint8_t *buf, int len)

 {

     SpiceVirtualChannel *svc = container_of(sin, SpiceVirtualChannel, sin);

-    ssize_t out;

+    ssize_t out = 0;

+    ssize_t last_out;

+    uint8_t* p = (uint8_t*)buf;

+

+    while (len > 0) {

+        last_out = virtio_serial_write(&svc->port, p,

+                            MIN(len, VMC_MAX_HOST_WRITE));

+        if (last_out > 0) {

+            out += last_out;

+            len -= last_out;

+            p += last_out;

+        } else {

+            break;

+        }

+    }

-    out = virtio_serial_write(&svc->port, buf, len);

-    dprintf(svc, 3, "%s: %lu/%d\n", __func__, out, len);

+    dprintf(svc, 3, "%s: %lu/%zd\n", __func__, out, len + out);

     return out;

 }

-- 

1.7.2.3