qemu-kvm/kvm-virtio-gpu-block-migration-of-VMs-with-blob-true.patch

From 5db0b4131c56d96760b3300298f4bedab99d35cb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= <marcandre.lureau@redhat.com>
Date: Wed, 6 Sep 2023 17:00:22 +0400
Subject: [PATCH 100/101] virtio-gpu: block migration of VMs with blob=true
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RH-Author: Marc-André Lureau <marcandre.lureau@redhat.com>
RH-MergeRequest: 217: virtio-gpu: block migration of VMs with blob=true
RH-Jira: RHEL-7565
RH-Commit: [1/1] f978ca697d574b1419eb027a1007c060dfb83298

JIRA: https://issues.redhat.com/browse/RHEL-7565

commit 9c549ab6895a43ad0cb33e684e11cdb0b5400897
Author: Marc-André Lureau <marcandre.lureau@redhat.com>
Date:   Wed Sep 6 17:00:22 2023 +0400

virtio-gpu: block migration of VMs with blob=true

"blob" resources don't have an associated pixman image:

#0  pixman_image_get_stride (image=0x0) at ../pixman/pixman-image.c:921
#1  0x0000562327c25236 in virtio_gpu_save (f=0x56232bb13b00, opaque=0x56232b555a60, size=0, field=0x5623289ab6c8 <__compound_literal.3+104>, vmdesc=0x56232ab59fe0) at ../hw/display/virtio-gpu.c:1225

Related to:
https://bugzilla.redhat.com/show_bug.cgi?id=2236353

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Acked-by: Peter Xu <peterx@redhat.com>

[ rhel backport - fix Error* vs Error** argument ]
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
 hw/display/virtio-gpu.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
index b016d3bac8..1702190ead 100644
--- a/hw/display/virtio-gpu.c
+++ b/hw/display/virtio-gpu.c
@@ -27,6 +27,7 @@
 #include "hw/virtio/virtio-gpu-pixman.h"
 #include "hw/virtio/virtio-bus.h"
 #include "hw/qdev-properties.h"
+#include "migration/blocker.h"
 #include "qemu/log.h"
 #include "qemu/module.h"
 #include "qapi/error.h"
@@ -41,6 +42,8 @@ virtio_gpu_find_check_resource(VirtIOGPU *g, uint32_t resource_id,
 
 static void virtio_gpu_reset_bh(void *opaque);
 
+static Error *blob_mig_blocker;
+
 void virtio_gpu_update_cursor_data(VirtIOGPU *g,
                                    struct virtio_gpu_scanout *s,
                                    uint32_t resource_id)
@@ -1452,6 +1455,14 @@ void virtio_gpu_device_realize(DeviceState *qdev, Error **errp)
             error_setg(errp, "blobs and virgl are not compatible (yet)");
             return;
         }
+
+        if (!blob_mig_blocker) {
+            error_setg(&blob_mig_blocker,
+                       "virtio-gpu blob VMs are currently not migratable.");
+        }
+        if (migrate_add_blocker(&blob_mig_blocker, errp)) {
+            return;
+        }
     }
 
     if (!virtio_gpu_base_device_realize(qdev,
@@ -1478,6 +1489,9 @@ static void virtio_gpu_device_unrealize(DeviceState *qdev)
 {
     VirtIOGPU *g = VIRTIO_GPU(qdev);
 
+    if (virtio_gpu_blob_enabled(g->parent_obj.conf)) {
+        migrate_del_blocker(&blob_mig_blocker);
+    }
     g_clear_pointer(&g->ctrl_bh, qemu_bh_delete);
     g_clear_pointer(&g->cursor_bh, qemu_bh_delete);
     g_clear_pointer(&g->reset_bh, qemu_bh_delete);
-- 
2.39.3