[Qemu-devel] [PATCHv3] qxl: add QXL_IO_FLUSH_{SURFACES, RELEASE} for guest S3&S4 support

[Alon Levy <alevy@redhat.com>]

Add two new IOs.
 QXL_IO_FLUSH_SURFACES - equivalent to update area for all surfaces, used
  to reduce vmexits from NumSurfaces to 1 on guest S3, S4 and resolution change (windows
  driver implementation is such that this is done on each of those occasions).
 QXL_IO_FLUSH_RELEASE - used to ensure anything on last_release is put on the release ring
  for the client to free.

Cc: Yonit Halperin <yhalperi@redhat.com>
---
 hw/qxl.c |   32 ++++++++++++++++++++++++++++++++
 1 files changed, 32 insertions(+), 0 deletions(-)

diff --git a/hw/qxl.c b/hw/qxl.c
index 1d6acce..a9cc1a3 100644
--- a/hw/qxl.c
+++ b/hw/qxl.c
@@ -181,6 +181,13 @@ static void qxl_spice_destroy_surface_wait(PCIQXLDevice *qxl, uint32_t id,
     }
 }
 
+#if SPICE_INTERFACE_QXL_MINOR >= 1
+static void qxl_spice_flush_surfaces_async(PCIQXLDevice *qxl)
+{
+    qxl->ssd.worker->flush_surfaces_async(qxl->ssd.worker, 0);
+}
+#endif
+
 void qxl_spice_loadvm_commands(PCIQXLDevice *qxl, struct QXLCommandExt *ext,
                                uint32_t count)
 {
@@ -1195,6 +1202,7 @@ static void ioport_write(void *opaque, uint32_t addr, uint32_t val)
     case QXL_IO_DESTROY_PRIMARY_ASYNC:
     case QXL_IO_DESTROY_SURFACE_ASYNC:
     case QXL_IO_DESTROY_ALL_SURFACES_ASYNC:
+    case QXL_IO_FLUSH_SURFACES_ASYNC:
 #if SPICE_INTERFACE_QXL_MINOR < 1
         fprintf(stderr, "qxl: error: async not supported by libspice but guest driver used it\n");
         return;
@@ -1322,6 +1330,30 @@ static void ioport_write(void *opaque, uint32_t addr, uint32_t val)
         }
         qxl_spice_destroy_surface_wait(d, val, async);
         break;
+    case QXL_IO_FLUSH_RELEASE: {
+        QXLReleaseRing *ring = &d->ram->release_ring;
+        if (ring->prod - ring->cons + 1 == ring->num_items) {
+            fprintf(stderr,
+                "ERROR: no flush, full release ring [p%d,%dc]\n",
+                ring->prod, ring->cons);
+        }
+        qxl_push_free_res(d, 1 /* flush */);
+        dprint(d, 1, "QXL_IO_FLUSH_RELEASE exit (%s, s#=%d, res#=%d,%p)\n",
+            qxl_mode_to_string(d->mode), d->guest_surfaces.count,
+            d->num_free_res, d->last_release);
+        break;
+    }
+    case QXL_IO_FLUSH_SURFACES_ASYNC:
+#if SPICE_INTERFACE_QXL_MINOR >= 1
+        dprint(d, 1, "QXL_IO_FLUSH_SURFACES_ASYNC (%d) (%s, s#=%d, res#=%d)\n",
+               val, qxl_mode_to_string(d->mode), d->guest_surfaces.count,
+               d->num_free_res);
+        qxl_spice_flush_surfaces_async(d);
+#else
+        dprint(d, 1, "QXL_IO_FLUSH_SURFACES_ASYNC (%d) ignored, too old spice server\n",
+               val);
+#endif
+        break;
     case QXL_IO_DESTROY_ALL_SURFACES_ASYNC:
     case QXL_IO_DESTROY_ALL_SURFACES:
         d->mode = QXL_MODE_UNDEFINED;
-- 
1.7.6