This is required for working agent in windows guests with up coming release.
Prevents pretty blue screens. Please Ack.
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 8e14446..bf0c06e 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;
}
--
1.7.1.1
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