Re: 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

[Ting-Wei Lan <lantw44@gmail.com>]

於 一，2015-06-15 於 14:55 -0400，Konrad Rzeszutek Wilk 提到：
> 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/com
> > mit/?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?
> 

My .config for Linux 4.0.4

https://gist.github.com/lantw44/5cbfc6e6052423bec910


It should be the same as the kernel provided by Fedora 22 except for
CONFIG_XEN_PVH=y.

> > 
> > 
> > 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@lists.xen.org
> > http://lists.xen.org/xen-devel

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