[Qemu-devel] [PATCH v2] qxl: add primary_created state, change mode lifetimes

[Alon Levy <alevy@redhat.com>]

Currently we define the following relation between modes and primary surface
existance:

 QXL_MODE_COMPAT
 QXL_MODE_NATIVE  primary exists
 QXL_MODE_UNDEFINED
 QXL_MODE_VGA     primary doesn't exist

This, coupled with disallowing various IO's when not in QXL_MODE_NATIVE or COMPAT
means that the S3 implementation gets more complex - This is wrong:
 DESTROY_SURFACES
 SURFACE_RELEASE
 .. wakeup
 PRIMARY_CREATE <-- error, we are already in NATIVE_MODE, not allowed!

This patch adds an explicit primary_created status, changed by:
CREATE_PRIMARY, DESTROY_PRIMARY, DESTROY_SURFACES

This patch also changes the lifetime of QXL_MODE_NATIVE.
 CREATE_PRIMARY - enter QXL_MODE_NATIVE
 vga io - exit QXL_MODE_NATIVE

anything else doesn't effect it, specifically DESTROY_PRIMARY.
---
 hw/qxl.c |   38 +++++++++++++++++++++++++++-----------
 hw/qxl.h |    1 +
 2 files changed, 28 insertions(+), 11 deletions(-)

diff --git a/hw/qxl.c b/hw/qxl.c
index fab0208..51a5270 100644
--- a/hw/qxl.c
+++ b/hw/qxl.c
@@ -666,6 +666,7 @@ static void qxl_enter_vga_mode(PCIQXLDevice *d)
         return;
     }
     dprint(d, 1, "%s\n", __FUNCTION__);
+    d->primary_created = 1;
     qemu_spice_create_host_primary(&d->ssd);
     d->mode = QXL_MODE_VGA;
     memset(&d->ssd.dirty, 0, sizeof(d->ssd.dirty));
@@ -677,10 +678,9 @@ static void qxl_exit_vga_mode(PCIQXLDevice *d)
         return;
     }
     dprint(d, 1, "%s\n", __FUNCTION__);
-    if (d->mode != QXL_MODE_UNDEFINED) {
-        d->mode = QXL_MODE_UNDEFINED;
-        qemu_spice_destroy_primary_surface(&d->ssd, 0);
-    }
+    d->mode = QXL_MODE_UNDEFINED;
+    d->primary_created = 0;
+    qemu_spice_destroy_primary_surface(&d->ssd, 0);
 }
 
 static void qxl_set_irq(PCIQXLDevice *d)
@@ -780,7 +780,9 @@ static void qxl_vga_ioport_write(void *opaque, uint32_t addr, uint32_t val)
         dprint(qxl, 1, "%s\n", __FUNCTION__);
         if (qxl->mode != QXL_MODE_UNDEFINED) {
             qxl->mode = QXL_MODE_UNDEFINED;
-            qemu_spice_destroy_primary_surface(&qxl->ssd, 0);
+            if (qxl->primary_created) {
+                qemu_spice_destroy_primary_surface(&qxl->ssd, 0);
+            }
         }
         qxl_soft_reset(qxl);
     }
@@ -912,8 +914,10 @@ static void qxl_create_guest_primary(PCIQXLDevice *qxl, int loadvm,
 {
     QXLSurfaceCreate *sc = &qxl->guest_primary.surface;
 
-    assert(qxl->mode != QXL_MODE_NATIVE);
-    qxl_exit_vga_mode(qxl);
+    if (qxl->mode != QXL_MODE_NATIVE) {
+        qxl_exit_vga_mode(qxl);
+    }
+    assert(!qxl->primary_created);
 
     dprint(qxl, 1, "%s: %dx%d\n", __FUNCTION__,
            le32_to_cpu(sc->width), le32_to_cpu(sc->height));
@@ -933,6 +937,7 @@ static void qxl_create_guest_primary(PCIQXLDevice *qxl, int loadvm,
         surface->flags |= QXL_SURF_FLAG_KEEP_DATA;
     }
 
+    qxl->primary_created = 1;
     qxl->mode = QXL_MODE_NATIVE;
     qxl->cmdflags = 0;
 
@@ -1156,15 +1161,19 @@ static void ioport_write(void *opaque, uint32_t addr, uint32_t val)
     case QXL_IO_DESTROY_PRIMARY:
         PANIC_ON(val != 0);
         dprint(d, 1, "QXL_IO_DESTROY_PRIMARY (%s)\n", qxl_mode_to_string(d->mode));
-        if (d->mode != QXL_MODE_UNDEFINED) {
-            d->mode = QXL_MODE_UNDEFINED;
+        if (d->primary_created) {
+            d->primary_created = 0;
             qemu_spice_destroy_primary_surface(&d->ssd, 0);
         }
         break;
     case QXL_IO_DESTROY_SURFACE_WAIT:
+        if (val == 0) {
+            d->primary_created = 0;
+        }
         qemu_spice_destroy_surface_wait(&d->ssd, val);
         break;
     case QXL_IO_DESTROY_ALL_SURFACES:
+        d->primary_created = 0;
         qemu_spice_destroy_surfaces(&d->ssd);
         break;
     case QXL_IO_FLUSH_SURFACES:
@@ -1209,8 +1218,8 @@ static void ioport_write(void *opaque, uint32_t addr, uint32_t val)
     case QXL_IO_DESTROY_PRIMARY_ASYNC:
         PANIC_ON(val != 0);
         dprint(d, 1, "QXL_IO_DESTROY_PRIMARY_ASYNC\n");
-        if (d->mode != QXL_MODE_UNDEFINED) {
-            d->mode = QXL_MODE_UNDEFINED;
+        if (d->primary_created) {
+            d->primary_created = 0;
             async = qemu_mallocz(sizeof(*async));
             goto async_common;
         } else {
@@ -1218,13 +1227,20 @@ static void ioport_write(void *opaque, uint32_t addr, uint32_t val)
             break;
         }
     case QXL_IO_UPDATE_AREA_ASYNC:
+        dprint(d, 1, "QXL_IO_UPDATE_AREA_ASYNC %d\n", val);
         async = qemu_mallocz(sizeof(*async));
         async->update_area = d->ram->update_area;
         async->update_surface = d->ram->update_surface;
         goto async_common;
     case QXL_IO_NOTIFY_OOM_ASYNC:
+        goto async_common;
     case QXL_IO_DESTROY_SURFACE_ASYNC:
+        if (val == 0) {
+            d->primary_created = 0;
+        }
+        goto async_common;
     case QXL_IO_DESTROY_ALL_SURFACES_ASYNC:
+        d->primary_created = 0;
         async = qemu_mallocz(sizeof(*async));
     async_common:
         async->port = io_port;
diff --git a/hw/qxl.h b/hw/qxl.h
index 584f02b..893f8d8 100644
--- a/hw/qxl.h
+++ b/hw/qxl.h
@@ -23,6 +23,7 @@ typedef struct PCIQXLDevice {
     uint32_t           guestdebug;
     uint32_t           cmdlog;
     enum qxl_mode      mode;
+    uint32_t           primary_created;
     uint32_t           cmdflags;
     int                generation;
     uint32_t           revision;
-- 
1.7.5.4