[Xen-devel] Is: graphics corruption with 'xen: Support Xen pv-domains using PAT." Was:Re: [BUG] Characters on the screen are broken on Linux >= 3.19 with VT-d enabled

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Sat, Jun 13, 2015 at 12:43:14AM +0800, Ting-Wei Lan wrote:
> When using Linux >= 3.19 as the dom0 kernel, characters on the screen become
> broken after the graphic driver is loaded. The commit that breaks it is
> (found by git bisect):
> 
> 
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=47591df

Lets CC Juergen
> 
> 
> Screenshot when the system run in single user mode:
> 
>   https://bugs.freedesktop.org/attachment.cgi?id=115079
> 
> 
> If it continues booting, the dom0 can crash after GDM tries to start Xorg.
> Some messages are showed when Xorg is running:
> 
>   [   80.636446] [drm] stuck on render ring
>   [   80.640041] [drm] GPU HANG: ecode 5:0:0x7fbfff08, in Xwayland [2112],
> reason: Ring hung, action: reset
> 
> 
> I cannot run 'dmesg' and 'xl dmesg' because the dom0 is unusable after Xorg
> runs, so I attach the serial console log instead. It was tested on Xen
> 4.5.1-rc2 and Linux 4.1-rc7:
> 
>   https://gist.github.com/lantw44/715160f1a53967a1627b
> 
> 
> This problem was reported to DRM/Intel, but they think it is not their bug.
> I also reported it to kernel bugzilla, but there is no response:
> 
>   https://bugs.freedesktop.org/show_bug.cgi?id=90037
>   https://bugzilla.kernel.org/show_bug.cgi?id=97421
> 
> 
> This problem only happens when VT-d is enabled. If I add 'iommu=off' to Xen
> boot arguments, there will be no problem. It seems it only happens on
> specific hardware. Two machines are listed below, one with the problem and
> one without the problem.

Could you also include your .config file please?

> 
> 
> The machine that has this problem:
> 
> (Software)
> Xen 4.4.2, 4.5.0, 4.5.1-rc2
> Linux 3.19.2, 3.19.3, 3.19.4, 4.0, 4.0.3, 4.0.4, 4.1-rc7
> 
> (CPU and GPU)
> Intel Core i5 CPU 650 @ 3.20GHz
> Intel Ironlake Desktop
> 
> (Motherboard)
> ASUSTeK Computer INC. P7H55D-M EVO
> 
> (lspci output)
> 00:00.0 Host bridge: Intel Corporation Core Processor DRAM Controller (rev
> 12)
> 00:01.0 PCI bridge: Intel Corporation Core Processor PCI Express x16 Root
> Port (rev 12)
> 00:02.0 VGA compatible controller: Intel Corporation Core Processor
> Integrated Graphics Controller (rev 12)
> 00:16.0 Communication controller: Intel Corporation 5 Series/3400 Series
> Chipset HECI Controller (rev 06)
> 00:1a.0 USB controller: Intel Corporation 5 Series/3400 Series Chipset USB2
> Enhanced Host Controller (rev 06)
> 00:1b.0 Audio device: Intel Corporation 5 Series/3400 Series Chipset High
> Definition Audio (rev 06)
> 00:1c.0 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI
> Express Root Port 1 (rev 06)
> 00:1c.1 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI
> Express Root Port 2 (rev 06)
> 00:1c.2 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI
> Express Root Port 3 (rev 06)
> 00:1c.3 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI
> Express Root Port 4 (rev 06)
> 00:1c.4 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI
> Express Root Port 5 (rev 06)
> 00:1c.5 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI
> Express Root Port 6 (rev 06)
> 00:1d.0 USB controller: Intel Corporation 5 Series/3400 Series Chipset USB2
> Enhanced Host Controller (rev 06)
> 00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev a6)
> 00:1f.0 ISA bridge: Intel Corporation 5 Series Chipset LPC Interface
> Controller (rev 06)
> 00:1f.2 SATA controller: Intel Corporation 5 Series/3400 Series Chipset 6
> port SATA AHCI Controller (rev 06)
> 00:1f.3 SMBus: Intel Corporation 5 Series/3400 Series Chipset SMBus
> Controller (rev 06)
> 01:00.0 USB controller: NEC Corporation uPD720200 USB 3.0 Host Controller
> (rev 03)
> 02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
> RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 03)
> 03:00.0 IDE interface: Marvell Technology Group Ltd. 88SE6121 SATA II / PATA
> Controller (rev b2)
> 05:00.0 FireWire (IEEE 1394): VIA Technologies, Inc. VT6315 Series Firewire
> Controller
> 06:00.0 USB controller: Renesas Technology Corp. uPD720202 USB 3.0 Host
> Controller (rev 02)
> 3f:00.0 Host bridge: Intel Corporation Core Processor QuickPath Architecture
> Generic Non-core Registers (rev 02)
> 3f:00.1 Host bridge: Intel Corporation Core Processor QuickPath Architecture
> System Address Decoder (rev 02)
> 3f:02.0 Host bridge: Intel Corporation Core Processor QPI Link 0 (rev 02)
> 3f:02.1 Host bridge: Intel Corporation 1st Generation Core i3/5/7 Processor
> QPI Physical 0 (rev 02)
> 3f:02.2 Host bridge: Intel Corporation 1st Generation Core i3/5/7 Processor
> Reserved (rev 02)
> 3f:02.3 Host bridge: Intel Corporation 1st Generation Core i3/5/7 Processor
> Reserved (rev 02)
> 
> 
> The machine that works fine:
> 
> (Software)
> Xen 4.4.1, 4.4.2
> Linux 3.19.1, 3.19.2, 3.19.3, 3.19.7, 4.0.4
> 
> (CPU and GPU)
> Intel Core i7-2600 CPU @ 3.40GHz
> Intel Sandybridge Desktop
> 
> (Motherboard)
> ASUSTeK Computer INC. P8Z68-M PRO
> 
> (lspci output)
> 00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family
> DRAM Controller (rev 09)
> 00:01.0 PCI bridge: Intel Corporation Xeon E3-1200/2nd Generation Core
> Processor Family PCI Express Root Port (rev 09)
> 00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core
> Processor Family Integrated Graphics Controller (rev 09)
> 00:16.0 Communication controller: Intel Corporation 6 Series/C200 Series
> Chipset Family MEI Controller #1 (rev 04)
> 00:1a.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset
> Family USB Enhanced Host Controller #2 (rev 05)
> 00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family
> High Definition Audio Controller (rev 05)
> 00:1c.0 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family
> PCI Express Root Port 1 (rev b5)
> 00:1c.4 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family
> PCI Express Root Port 5 (rev b5)
> 00:1c.5 PCI bridge: Intel Corporation 82801 PCI Bridge (rev b5)
> 00:1c.6 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family
> PCI Express Root Port 7 (rev b5)
> 00:1c.7 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family
> PCI Express Root Port 8 (rev b5)
> 00:1d.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset
> Family USB Enhanced Host Controller #1 (rev 05)
> 00:1f.0 ISA bridge: Intel Corporation Z68 Express Chipset Family LPC
> Controller (rev 05)
> 00:1f.2 SATA controller: Intel Corporation 6 Series/C200 Series Chipset
> Family SATA AHCI Controller (rev 05)
> 00:1f.3 SMBus: Intel Corporation 6 Series/C200 Series Chipset Family SMBus
> Controller (rev 05)
> 01:00.0 VGA compatible controller: NVIDIA Corporation G96 [GeForce 9400 GT]
> (rev a1)
> 03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
> RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 06)
> 04:00.0 PCI bridge: ASMedia Technology Inc. ASM1083/1085 PCIe to PCI Bridge
> (rev 01)
> 06:00.0 SATA controller: ASMedia Technology Inc. ASM1062 Serial ATA
> Controller (rev 01)
> 07:00.0 USB controller: ASMedia Technology Inc. ASM1042 SuperSpeed USB Host
> Controller
> 
> 
> I still remember that there was a similar problem found two years ago on the
> same hardware with similar broken screen output and it also crashed after
> Xorg was started, but I cannot confirm that they are the same problems. I
> don't know whether error messages are simliar.
> 
> The old problem happens on Linux 3.7 ~ 3.10 with VT-d enabled. It only
> happened when not using Xen, so I added 'intel_iommu=off' to Linux boot
> arguments to workaround it.
> 
> The problem I report here happens on Linux >= 3.19 with VT-d enabled. It
> only happens when using Xen, so I add 'iommu=off' to Xen boot arguments to
> workaround it.
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxx
> http://lists.xen.org/xen-devel

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