Re: Xen 4.3 development update RC2 imminent

[Anthony PERARD <anthony.perard@citrix.com>]

On 20/05/13 11:33, George Dunlap wrote:
> * qxl not actually working
>   > qxl apparently not enabled during compile by default
>   > Appear to be some other bugs even when it is working:
>   >   http://lists.xen.org/archives/html/xen-devel/2012-11/msg00713.html
>   owner: ? (Anthony was going to take a look)
>   We need to either fix both of these problems or disable qxl for 4.3

I've been able to track down this error:
> Spice-CRITICAL **: red_memslots.c:123:get_virt: slot_id 194 too big,
addr=c2c2c2c2c2c2c2c2

This little patch fix it:
diff --git a/hw/qxl.c b/hw/qxl.c
index 96887c4..db2e02e 100644
--- a/hw/qxl.c
+++ b/hw/qxl.c
@@ -390,6 +390,7 @@ static void init_qxl_ram(PCIQXLDevice *d)
     d->ram->int_pending = cpu_to_le32(0);
     d->ram->int_mask    = cpu_to_le32(0);
     d->ram->update_surface = 0;
+    d->ram->monitors_config = 0;
     SPICE_RING_INIT(&d->ram->cmd_ring);
     SPICE_RING_INIT(&d->ram->cursor_ring);
     SPICE_RING_INIT(&d->ram->release_ring);

But then, once this applied, qxl is still not able to start. Xorg crash
(in the guest), and here is why:

(XEN) emulate.c:88:d18 bad mmio size 16
(XEN) io.c:201:d18 MMIO emulation failed @ 0033:7fd2de390430: f3 0f 6f
19 41 83 e8 403
(XEN) emulate.c:88:d18 bad mmio size 16
(XEN) io.c:201:d18 MMIO emulation failed @ 0033:7fd2de390430: f3 0f 6f
19 41 83 e8 403

The backtrace of X:
(EE) 0: /usr/bin/X (xorg_backtrace+0x3d) [0x57f48d]
(EE) 1: /usr/bin/X (0x400000+0x1831e9) [0x5831e9]
(EE) 2: /usr/lib/libpthread.so.0 (0x7fd2de7c0000+0xf0e0) [0x7fd2de7cf0e0]
(EE) 3: /usr/lib/libpixman-1.so.0 (0x7fd2de300000+0x90430) [0x7fd2de390430]
(EE) 4: /usr/lib/libpixman-1.so.0 (0x7fd2de300000+0x9066b) [0x7fd2de39066b]
(EE) 5: /usr/lib/libpixman-1.so.0 (pixman_image_composite32+0x481)
[0x7fd2de30bb01]
(EE) 6: /usr/lib/xorg/modules/drivers/qxl_drv.so (0x7fd2dc260000+0x9345)
[0x7fd2dc269345]
(EE) 7: /usr/lib/xorg/modules/drivers/qxl_drv.so (0x7fd2dc260000+0xa1c7)
[0x7fd2dc26a1c7]
(EE) 8: /usr/lib/xorg/modules/drivers/qxl_drv.so (0x7fd2dc260000+0xeb1f)
[0x7fd2dc26eb1f]
(EE) 9: /usr/lib/xorg/modules/drivers/qxl_drv.so
(0x7fd2dc260000+0x11ecf) [0x7fd2dc271ecf]
(EE) 10: /usr/bin/X (0x400000+0x170353) [0x570353]
(EE) 11: /usr/bin/X (0x400000+0xc0b95) [0x4c0b95]
(EE) 12: /usr/bin/X (0x400000+0x34726) [0x434726]
(EE) 13: /usr/bin/X (0x400000+0x3721e) [0x43721e]
(EE) 14: /usr/bin/X (0x400000+0x26895) [0x426895]
(EE) 15: /usr/lib/libc.so.6 (__libc_start_main+0xf5) [0x7fd2dd621a15]
(EE) 16: /usr/bin/X (0x400000+0x26bdd) [0x426bdd]
(EE)
(EE) Segmentation fault at address 0x0

So I giving up on this issue for now. So I think we can disable "vga = qxl".

-- 
Anthony PERARD