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[Qemu-devel] [Bug 1784900] Re: QEMU (frontend) crashes upon warm reboot
From: |
Stefan Berger |
Subject: |
[Qemu-devel] [Bug 1784900] Re: QEMU (frontend) crashes upon warm reboot with virtio-gpu device and vga=775 on Linux cmdline |
Date: |
Thu, 02 Aug 2018 01:00:42 -0000 |
This patch here fixes the issue, but is likely introducing inefficiency.
There are two if statements above the patch that should set full_update
= 1 due to 'some change', but none of them triggers it. So I think the
surface is wrong and needs to be recreated.
diff --git a/hw/display/vga.c b/hw/display/vga.c
index ed476e4e80..71b5684994 100644
--- a/hw/display/vga.c
+++ b/hw/display/vga.c
@@ -1571,6 +1571,7 @@ static void vga_draw_graphic(VGACommonState *s, int
full_update)
* must be updated with the new base address */
full_update = 1;
}
+ full_update = 1;
if (full_update) {
if (share_surface) {
A better solution may be this one here:
diff --git a/hw/display/vga.c b/hw/display/vga.c
index ed476e4e80..4f365b6d43 100644
--- a/hw/display/vga.c
+++ b/hw/display/vga.c
@@ -1566,7 +1566,7 @@ static void vga_draw_graphic(VGACommonState *s, int
full_update)
full_update = 1;
}
if (surface_data(surface) != s->vram_ptr + (s->start_addr * 4)
- && is_buffer_shared(surface)) {
+ /*&& is_buffer_shared(surface)*/) {
/* base address changed (page flip) -> shared display surfaces
* must be updated with the new base address */
full_update = 1;
--
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https://bugs.launchpad.net/bugs/1784900
Title:
QEMU (frontend) crashes upon warm reboot with virtio-gpu device and
vga=775 on Linux cmdline
Status in QEMU:
New
Bug description:
With vga=775 on the Linux command line a first boot of the VM running
Linux works fine. After a warm reboot it crashes during Linux boot.
The VM was used remotely via virt-manager and VNC.
Bisecting the code lead to the following patch that introduced the
bug:
commit 1fccd7c5a9a722a9cbf1bc91693f4618034f01ac (HEAD, refs/bisect/bad)
Author: Gerd Hoffmann <address@hidden>
Date: Mon Jul 2 18:24:43 2018 +0200
virtio-gpu: disable scanout when backing resource is destroyed
Signed-off-by: Gerd Hoffmann <address@hidden>
Reviewed-by: Marc-André Lureau <address@hidden>
Message-id: address@hidden
diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
index 336dc59007..08cd567218 100644
--- a/hw/display/virtio-gpu.c
+++ b/hw/display/virtio-gpu.c
@@ -430,6 +430,16 @@ static void virtio_gpu_disable_scanout(VirtIOGPU *g, int
scanout_id)
static void virtio_gpu_resource_destroy(VirtIOGPU *g,
struct virtio_gpu_simple_resource
*res)
{
+ int i;
+
+ if (res->scanout_bitmask) {
+ for (i = 0; i < g->conf.max_outputs; i++) {
+ if (res->scanout_bitmask & (1 << i)) {
+ virtio_gpu_disable_scanout(g, i);
+ }
+ }
+ }
+
pixman_image_unref(res->image);
virtio_gpu_cleanup_mapping(res);
QTAILQ_REMOVE(&g->reslist, res, next);
Reported backtraces can be found here:
https://paste.fedoraproject.org/paste/OUDEfCk1IY7xiy0I0PDlkw
To manage notifications about this bug go to:
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- [Qemu-devel] [Bug 1784900] [NEW] QEMU (frontend) crashes upon warm reboot with virtio-gpu device and vga=775 on Linux cmdline, Stefan Berger, 2018/08/01
- [Qemu-devel] [Bug 1784900] Re: QEMU (frontend) crashes upon warm reboot with virtio-gpu device and vga=775 on Linux cmdline, Daniel Berrange, 2018/08/01
- [Qemu-devel] [Bug 1784900] Re: QEMU (frontend) crashes upon warm reboot with virtio-gpu device and vga=775 on Linux cmdline, Dr. David Alan Gilbert, 2018/08/01
- [Qemu-devel] [Bug 1784900] Re: QEMU (frontend) crashes upon warm reboot with virtio-gpu device and vga=775 on Linux cmdline, Stefan Berger, 2018/08/01
- [Qemu-devel] [Bug 1784900] Re: QEMU (frontend) crashes upon warm reboot with virtio-gpu device and vga=775 on Linux cmdline,
Stefan Berger <=
- [Qemu-devel] [Bug 1784900] Re: QEMU (frontend) crashes upon warm reboot with virtio-gpu device and vga=775 on Linux cmdline, Stefan Berger, 2018/08/02
- [Qemu-devel] [Bug 1784900] Re: QEMU (frontend) crashes upon warm reboot with virtio-gpu device and vga=775 on Linux cmdline, Stefan Berger, 2018/08/02
- [Qemu-devel] [Bug 1784900] Re: QEMU (frontend) crashes upon warm reboot with virtio-gpu device and vga=775 on Linux cmdline, elmarco, 2018/08/06
- [Qemu-devel] [Bug 1784900] Re: QEMU (frontend) crashes upon warm reboot with virtio-gpu device and vga=775 on Linux cmdline, Thomas Huth, 2018/08/15