qemu-kvm/SOURCES/kvm-virtio-gpu-fix-scanout-migration-post-load.patch

From 523423436e83b01a83c60bc44bd08471992aaff4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= <marcandre.lureau@redhat.com>
Date: Mon, 15 Jan 2024 16:34:33 +0400
Subject: [PATCH 1/4] virtio-gpu: fix scanout migration post-load
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RH-Author: Marc-André Lureau <marcandre.lureau@redhat.com>
RH-MergeRequest: 377: virtio-gpu: fix scanout migration post-load
RH-Jira: RHEL-36181
RH-Acked-by: Peter Xu <peterx@redhat.com>
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Commit: [1/3] 05e9dbf7f602d62ec2f336a855daf57e6ee8f3f3

The current post-loading code for scanout has a FIXME: it doesn't take
the resource region/rect into account. But there is more, when adding
blob migration support in commit f66767f75c9, I didn't realize that blob
resources could be used for scanouts. This situationn leads to a crash
during post-load, as they don't have an associated res->image.

virtio_gpu_do_set_scanout() handle all cases, but requires the
associated virtio_gpu_framebuffer, which is currently not saved during
migration.

Add a v2 of "virtio-gpu-one-scanout" with the framebuffer fields, so we
can restore blob scanouts, as well as fixing the existing FIXME.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Sebastian Ott <sebott@redhat.com>
(cherry picked from commit dfcf74fa68c88233209aafc5f82728d0b9a1af5c)
---
 hw/display/virtio-gpu.c        | 55 +++++++++++++++++++++++++++-------
 include/hw/virtio/virtio-gpu.h |  1 +
 2 files changed, 46 insertions(+), 10 deletions(-)

diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
index 1702190ead..bc485d60ea 100644
--- a/hw/display/virtio-gpu.c
+++ b/hw/display/virtio-gpu.c
@@ -598,6 +598,7 @@ static void virtio_unref_resource(pixman_image_t *image, void *data)
 static void virtio_gpu_update_scanout(VirtIOGPU *g,
                                       uint32_t scanout_id,
                                       struct virtio_gpu_simple_resource *res,
+                                      struct virtio_gpu_framebuffer *fb,
                                       struct virtio_gpu_rect *r)
 {
     struct virtio_gpu_simple_resource *ores;
@@ -615,9 +616,10 @@ static void virtio_gpu_update_scanout(VirtIOGPU *g,
     scanout->y = r->y;
     scanout->width = r->width;
     scanout->height = r->height;
+    scanout->fb = *fb;
 }
 
-static void virtio_gpu_do_set_scanout(VirtIOGPU *g,
+static bool virtio_gpu_do_set_scanout(VirtIOGPU *g,
                                       uint32_t scanout_id,
                                       struct virtio_gpu_framebuffer *fb,
                                       struct virtio_gpu_simple_resource *res,
@@ -643,7 +645,7 @@ static void virtio_gpu_do_set_scanout(VirtIOGPU *g,
                       r->x, r->y, r->width, r->height,
                       fb->width, fb->height);
         *error = VIRTIO_GPU_RESP_ERR_INVALID_PARAMETER;
-        return;
+        return false;
     }
 
     g->parent_obj.enable = 1;
@@ -651,11 +653,12 @@ static void virtio_gpu_do_set_scanout(VirtIOGPU *g,
     if (res->blob) {
         if (console_has_gl(scanout->con)) {
             if (!virtio_gpu_update_dmabuf(g, scanout_id, res, fb, r)) {
-                virtio_gpu_update_scanout(g, scanout_id, res, r);
+                virtio_gpu_update_scanout(g, scanout_id, res, fb, r);
             } else {
                 *error = VIRTIO_GPU_RESP_ERR_OUT_OF_MEMORY;
+                return false;
             }
-            return;
+            return true;
         }
 
         data = res->blob;
@@ -684,7 +687,7 @@ static void virtio_gpu_do_set_scanout(VirtIOGPU *g,
         scanout->ds = qemu_create_displaysurface_pixman(rect);
         if (!scanout->ds) {
             *error = VIRTIO_GPU_RESP_ERR_UNSPEC;
-            return;
+            return false;
         }
 #ifdef WIN32
         qemu_displaysurface_win32_set_handle(scanout->ds, res->handle, fb->offset);
@@ -695,7 +698,8 @@ static void virtio_gpu_do_set_scanout(VirtIOGPU *g,
                                 scanout->ds);
     }
 
-    virtio_gpu_update_scanout(g, scanout_id, res, r);
+    virtio_gpu_update_scanout(g, scanout_id, res, fb, r);
+    return true;
 }
 
 static void virtio_gpu_set_scanout(VirtIOGPU *g,
@@ -1166,8 +1170,9 @@ static void virtio_gpu_cursor_bh(void *opaque)
 
 static const VMStateDescription vmstate_virtio_gpu_scanout = {
     .name = "virtio-gpu-one-scanout",
-    .version_id = 1,
-    .fields = (VMStateField[]) {
+    .version_id = 2,
+    .minimum_version_id = 1,
+    .fields = (const VMStateField[]) {
         VMSTATE_UINT32(resource_id, struct virtio_gpu_scanout),
         VMSTATE_UINT32(width, struct virtio_gpu_scanout),
         VMSTATE_UINT32(height, struct virtio_gpu_scanout),
@@ -1178,6 +1183,12 @@ static const VMStateDescription vmstate_virtio_gpu_scanout = {
         VMSTATE_UINT32(cursor.hot_y, struct virtio_gpu_scanout),
         VMSTATE_UINT32(cursor.pos.x, struct virtio_gpu_scanout),
         VMSTATE_UINT32(cursor.pos.y, struct virtio_gpu_scanout),
+        VMSTATE_UINT32_V(fb.format, struct virtio_gpu_scanout, 2),
+        VMSTATE_UINT32_V(fb.bytes_pp, struct virtio_gpu_scanout, 2),
+        VMSTATE_UINT32_V(fb.width, struct virtio_gpu_scanout, 2),
+        VMSTATE_UINT32_V(fb.height, struct virtio_gpu_scanout, 2),
+        VMSTATE_UINT32_V(fb.stride, struct virtio_gpu_scanout, 2),
+        VMSTATE_UINT32_V(fb.offset, struct virtio_gpu_scanout, 2),
         VMSTATE_END_OF_LIST()
     },
 };
@@ -1349,6 +1360,7 @@ static int virtio_gpu_blob_save(QEMUFile *f, void *opaque, size_t size,
         if (!res->blob_size) {
             continue;
         }
+        assert(!res->image);
         qemu_put_be32(f, res->resource_id);
         qemu_put_be32(f, res->blob_size);
         qemu_put_be32(f, res->iov_cnt);
@@ -1411,11 +1423,11 @@ static int virtio_gpu_post_load(void *opaque, int version_id)
     int i;
 
     for (i = 0; i < g->parent_obj.conf.max_outputs; i++) {
-        /* FIXME: should take scanout.r.{x,y} into account */
         scanout = &g->parent_obj.scanout[i];
         if (!scanout->resource_id) {
             continue;
         }
+
         res = virtio_gpu_find_resource(g, scanout->resource_id);
         if (!res) {
             return -EINVAL;
@@ -1428,7 +1440,30 @@ static int virtio_gpu_post_load(void *opaque, int version_id)
         qemu_displaysurface_win32_set_handle(scanout->ds, res->handle, 0);
 #endif
 
-        dpy_gfx_replace_surface(scanout->con, scanout->ds);
+        if (scanout->fb.format != 0) {
+            uint32_t error = 0;
+            struct virtio_gpu_rect r = {
+                .x = scanout->x,
+                .y = scanout->y,
+                .width = scanout->width,
+                .height = scanout->height
+            };
+
+            if (!virtio_gpu_do_set_scanout(g, i, &scanout->fb, res, &r, &error)) {
+                return -EINVAL;
+            }
+        } else {
+            /* legacy v1 migration support */
+            if (!res->image) {
+                return -EINVAL;
+            }
+            scanout->ds = qemu_create_displaysurface_pixman(res->image);
+#ifdef WIN32
+            qemu_displaysurface_win32_set_handle(scanout->ds, res->handle, 0);
+#endif
+            dpy_gfx_replace_surface(scanout->con, scanout->ds);
+        }
+
         dpy_gfx_update_full(scanout->con);
         if (scanout->cursor.resource_id) {
             update_cursor(g, &scanout->cursor);
diff --git a/include/hw/virtio/virtio-gpu.h b/include/hw/virtio/virtio-gpu.h
index 584ba2ed73..9a13afb34e 100644
--- a/include/hw/virtio/virtio-gpu.h
+++ b/include/hw/virtio/virtio-gpu.h
@@ -81,6 +81,7 @@ struct virtio_gpu_scanout {
     uint32_t resource_id;
     struct virtio_gpu_update_cursor cursor;
     QEMUCursor *current_cursor;
+    struct virtio_gpu_framebuffer fb;
 };
 
 struct virtio_gpu_requested_state {
-- 
2.39.3