From mboxrd@z Thu Jan  1 00:00:00 1970
From: Wei Liu <liuw@liuw.name>
Subject: Re: Console is not working with 2.6.38.4 Dom0 and Xen
	unstable
Date: Mon, 2 May 2011 19:31:21 +0800
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	<20110430095932.GR32595@reaktio.net>
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Cc: xen-devel@lists.xensource.com, Stefano Stabellini <stefano.stabellini@eu.citrix.com>
List-Id: xen-devel@lists.xenproject.org

I test with various command line options, along with Konrad's [1] and
Jeremy's [2] kernel. It's still blank.

Konrad's kernel is 2.6.39-rc4, runs well on bare metal, blank screen
on Xen unstable.

Jeremy's kernel is 2.6.32.39, assertion fails with
boot_cpu_has(X86_FEATURE_TSC_RELIABLE) when booting on Xen unstable.

I also skim hvc_xen.c, the Dom0 console operations are straight
forward -- they are just wrapper of console IO hypercall.

Is that a hardware-related problem?

------ output of lspci -vvv ------

00:00.0 Host bridge: Intel Corporation 4 Series Chipset DRAM Controller (rev 03)
	Subsystem: Lenovo Device 3047
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort+ >SERR- <PERR- INTx-
	Latency: 0
	Capabilities: <access denied>
	Kernel driver in use: agpgart-intel

00:02.0 VGA compatible controller: Intel Corporation 4 Series Chipset
Integrated Graphics Controller (rev 03) (prog-if 00 [VGA controller])
	Subsystem: Lenovo Device 3047
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 11
	Region 0: Memory at fc000000 (64-bit, non-prefetchable) [size=4M]
	Region 2: Memory at e0000000 (64-bit, prefetchable) [size=256M]
	Region 4: I/O ports at 1c70 [size=8]
	Expansion ROM at <unassigned> [disabled]
	Capabilities: <access denied>

00:02.1 Display controller: Intel Corporation 4 Series Chipset
Integrated Graphics Controller (rev 03)
	Subsystem: Lenovo Device 3047
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Region 0: Memory at fc400000 (64-bit, non-prefetchable) [size=1M]
	Capabilities: <access denied>

00:03.0 Communication controller: Intel Corporation 4 Series Chipset
HECI Controller (rev 03)
	Subsystem: Lenovo Device 3047
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx+
	Latency: 0
	Interrupt: pin A routed to IRQ 11
	Region 0: Memory at fc524000 (64-bit, non-prefetchable) [size=16]
	Capabilities: <access denied>

00:03.2 IDE interface: Intel Corporation 4 Series Chipset PT IDER
Controller (rev 03) (prog-if 85 [Master SecO PriO])
	Subsystem: Lenovo Device 3047
	Control: I/O- Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin C routed to IRQ 5
	Region 0: I/O ports at 1c88 [disabled] [size=8]
	Region 1: I/O ports at 1c7c [disabled] [size=4]
	Region 2: I/O ports at 1c80 [disabled] [size=8]
	Region 3: I/O ports at 1c78 [disabled] [size=4]
	Region 4: I/O ports at 1c40 [disabled] [size=16]
	Capabilities: <access denied>

00:03.3 Serial controller: Intel Corporation 4 Series Chipset Serial
KT Controller (rev 03) (prog-if 02 [16550])
	Subsystem: Lenovo Device 3047
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin B routed to IRQ 17
	Region 0: I/O ports at 1c90 [size=8]
	Region 1: Memory at fc526000 (32-bit, non-prefetchable) [size=4K]
	Capabilities: <access denied>
	Kernel driver in use: serial

00:19.0 Ethernet controller: Intel Corporation 82567LM-3 Gigabit
Network Connection (rev 02)
	Subsystem: Lenovo Device 3047
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR+ FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 43
	Region 0: Memory at fc500000 (32-bit, non-prefetchable) [size=128K]
	Region 1: Memory at fc527000 (32-bit, non-prefetchable) [size=4K]
	Region 2: I/O ports at 1820 [size=32]
	Capabilities: <access denied>
	Kernel driver in use: e1000e

00:1a.0 USB Controller: Intel Corporation 82801JD/DO (ICH10 Family)
USB UHCI Controller #4 (rev 02) (prog-if 00 [UHCI])
	Subsystem: Lenovo Device 3047
	Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 16
	Region 4: I/O ports at 1840 [size=32]
	Capabilities: <access denied>
	Kernel driver in use: uhci_hcd

00:1a.1 USB Controller: Intel Corporation 82801JD/DO (ICH10 Family)
USB UHCI Controller #5 (rev 02) (prog-if 00 [UHCI])
	Subsystem: Lenovo Device 3047
	Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin B routed to IRQ 17
	Region 4: I/O ports at 1860 [size=32]
	Capabilities: <access denied>
	Kernel driver in use: uhci_hcd

00:1a.2 USB Controller: Intel Corporation 82801JD/DO (ICH10 Family)
USB UHCI Controller #6 (rev 02) (prog-if 00 [UHCI])
	Subsystem: Lenovo Device 3047
	Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin C routed to IRQ 18
	Region 4: I/O ports at 1880 [size=32]
	Capabilities: <access denied>
	Kernel driver in use: uhci_hcd

00:1a.7 USB Controller: Intel Corporation 82801JD/DO (ICH10 Family)
USB2 EHCI Controller #2 (rev 02) (prog-if 20 [EHCI])
	Subsystem: Lenovo Device 3047
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin C routed to IRQ 18
	Region 0: Memory at fc528000 (32-bit, non-prefetchable) [size=1K]
	Capabilities: <access denied>
	Kernel driver in use: ehci_hcd

00:1b.0 Audio device: Intel Corporation 82801JD/DO (ICH10 Family) HD
Audio Controller (rev 02)
	Subsystem: Lenovo Device 3047
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR+ FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 32 bytes
	Interrupt: pin A routed to IRQ 44
	Region 0: Memory at fc520000 (64-bit, non-prefetchable) [size=16K]
	Capabilities: <access denied>
	Kernel driver in use: HDA Intel

00:1d.0 USB Controller: Intel Corporation 82801JD/DO (ICH10 Family)
USB UHCI Controller #1 (rev 02) (prog-if 00 [UHCI])
	Subsystem: Lenovo Device 3047
	Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 16
	Region 4: I/O ports at 18a0 [size=32]
	Capabilities: <access denied>
	Kernel driver in use: uhci_hcd

00:1d.1 USB Controller: Intel Corporation 82801JD/DO (ICH10 Family)
USB UHCI Controller #2 (rev 02) (prog-if 00 [UHCI])
	Subsystem: Lenovo Device 3047
	Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin B routed to IRQ 17
	Region 4: I/O ports at 18c0 [size=32]
	Capabilities: <access denied>
	Kernel driver in use: uhci_hcd

00:1d.2 USB Controller: Intel Corporation 82801JD/DO (ICH10 Family)
USB UHCI Controller #3 (rev 02) (prog-if 00 [UHCI])
	Subsystem: Lenovo Device 3047
	Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin C routed to IRQ 18
	Region 4: I/O ports at 18e0 [size=32]
	Capabilities: <access denied>
	Kernel driver in use: uhci_hcd

00:1d.7 USB Controller: Intel Corporation 82801JD/DO (ICH10 Family)
USB2 EHCI Controller #1 (rev 02) (prog-if 20 [EHCI])
	Subsystem: Lenovo Device 3047
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 16
	Region 0: Memory at fc529000 (32-bit, non-prefetchable) [size=1K]
	Capabilities: <access denied>
	Kernel driver in use: ehci_hcd

00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev a2)
(prog-if 01 [Subtractive decode])
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Bus: primary=00, secondary=11, subordinate=11, sec-latency=32
	I/O behind bridge: 0000f000-00000fff
	Memory behind bridge: fff00000-000fffff
	Prefetchable memory behind bridge: 00000000fff00000-00000000000fffff
	Secondary status: 66MHz- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort+ <SERR- <PERR-
	BridgeCtl: Parity- SERR- NoISA+ VGA- MAbort- >Reset- FastB2B-
		PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
	Capabilities: <access denied>

00:1f.0 ISA bridge: Intel Corporation 82801JDO (ICH10DO) LPC Interface
Controller (rev 02)
	Subsystem: Lenovo Device 3047
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Capabilities: <access denied>

00:1f.2 SATA controller: Intel Corporation 82801JD/DO (ICH10 Family)
SATA AHCI Controller (rev 02) (prog-if 01 [AHCI 1.0])
	Subsystem: Lenovo Device 3047
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin B routed to IRQ 42
	Region 0: I/O ports at 1ca8 [size=8]
	Region 1: I/O ports at 1c9c [size=4]
	Region 2: I/O ports at 1ca0 [size=8]
	Region 3: I/O ports at 1c98 [size=4]
	Region 4: I/O ports at 1c00 [size=32]
	Region 5: Memory at fc52a000 (32-bit, non-prefetchable) [size=2K]
	Capabilities: <access denied>
	Kernel driver in use: ahci

00:1f.3 SMBus: Intel Corporation 82801JD/DO (ICH10 Family) SMBus
Controller (rev 02)
	Subsystem: Lenovo Device 3047
	Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx-
	Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
	Interrupt: pin B routed to IRQ 17
	Region 0: Memory at fc52b000 (64-bit, non-prefetchable) [size=256]
	Region 4: I/O ports at 1c20 [size=32]
	Kernel driver in use: i801_smbus

------ end of output ------

[1] git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git
[2] git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen.git

-- 
Best regards
Wei Liu
Twitter: @iliuw
Site: http://liuw.name