[Lguest] Bad Page Table Entry

Thu May 2 03:52:17 EST 2013

I've modified the Android "Goldfish" defconfig to include
lguest support. I'm testing it out on a qemu instance and launching
it as:

# ./lguest 64 bzImage --block=DSL-4.4-root_fs root=/dev/vda

I keep getting a bad page table entry message. dmesg is below:

[    0.000000] Reserving virtual address space above 0xffc00000
[    0.000000] Linux version 3.4.5+ (earlence at earlence-Satellite-L650) (gcc
version 4.5.2 (Ubuntu/Linaro 4.5.2-8ubuntu4) ) #3 Wed May 1 13:13:52 EDT
2013
[    0.000000] BIOS-provided physical RAM map:
[    0.000000]  LGUEST: 0000000000000000 - 0000000004000000 (usable)
[    0.000000] Notice: NX (Execute Disable) protection missing in CPU!
[    0.000000] MPS support code is not built-in.
[    0.000000] Using acpi=off or acpi=noirq or pci=noacpi may have problem
[    0.000000] DMI not present or invalid.
[    0.000000] last_pfn = 0x4000 max_arch_pfn = 0x100000
[    0.000000] init_memory_mapping: 0000000000000000-0000000004000000
[    0.000000] 0MB HIGHMEM available.
[    0.000000] 64MB LOWMEM available.
[    0.000000]   mapped low ram: 0 - 04000000
[    0.000000]   low ram: 0 - 04000000
[    0.000000] Zone PFN ranges:
[    0.000000]   DMA      0x00000010 -> 0x00001000
[    0.000000]   Normal   0x00001000 -> 0x00004000
[    0.000000]   HighMem  empty
[    0.000000] Movable zone start PFN for each node
[    0.000000] Early memory PFN ranges
[    0.000000]     0: 0x00000010 -> 0x000000a0
[    0.000000]     0: 0x00000100 -> 0x00004000
[    0.000000] Using APIC driver default
[    0.000000] APIC: disable apic facility
[    0.000000] APIC: switched to apic NOOP
[    0.000000] Allocating PCI resources starting at 4000000 (gap:
4000000:fc000000)
[    0.000000] Booting paravirtualized kernel on lguest
[    0.000000] Built 1 zonelists in Zone order, mobility grouping on.
 Total pages: 16144
[    0.000000] Kernel command line: root=/dev/vda
[    0.000000] PID hash table entries: 256 (order: -2, 1024 bytes)
[    0.000000] Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
[    0.000000] Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
[    0.000000] Initializing CPU#0
[    0.000000] Initializing HighMem for node 0 (00000000:00000000)
[    0.000000] Memory: 57804k/65536k available (3235k kernel code, 7284k
reserved, 1604k data, 344k init, 0k highmem)
[    0.000000] virtual kernel memory layout:
[    0.000000]     fixmap  : 0xffbe2000 - 0xffbff000   ( 116 kB)
[    0.000000]     pkmap   : 0xff400000 - 0xff800000   (4096 kB)
[    0.000000]     vmalloc : 0xc4800000 - 0xff3fe000   ( 939 MB)
[    0.000000]     lowmem  : 0xc0000000 - 0xc4000000   (  64 MB)
[    0.000000]       .init : 0xc14bb000 - 0xc1511000   ( 344 kB)
[    0.000000]       .data : 0xc1328d95 - 0xc14ba0c0   (1604 kB)
[    0.000000]       .text : 0xc1000000 - 0xc1328d95   (3235 kB)
[    0.000000] Checking if this processor honours the WP bit even in
supervisor mode...Ok.
[    0.000000] SLUB: Genslabs=15, HWalign=32, Order=0-3, MinObjects=0,
CPUs=1, Nodes=1
[    0.000000] NR_IRQS:16 nr_irqs:16 16
[    0.000000] Console: colour dummy device 80x25
[    0.000000] console [hvc0] enabled
[    0.000000] Marking TSC unstable due to could not calculate TSC khz
[    0.000000] Calibrating delay loop... 2131.55 BogoMIPS (lpj=10657792)
[    0.200000] pid_max: default: 32768 minimum: 301
[    0.200000] Security Framework initialized
[    0.200000] Mount-cache hash table entries: 512
[    0.200000] Initializing cgroup subsys cpuacct
[    0.200000] CPU: Intel OverDrive PODP5V83 stepping 03
[    0.210000] Performance Events: no PMU driver, software events only.
[    0.210000] Apic disabled
[    0.220000] NET: Registered protocol family 16
[    0.220000] Device at 0 has size 33
[    0.220000] Device at 33 has size 21
[    0.220000] PCI: Fatal: No config space access function found
[    0.240000] bio: create slab <bio-0> at 0
[    0.240000] ACPI: Interpreter disabled.
[    0.240000] PCI: Using host bridge windows from ACPI; if necessary, use
"pci=nocrs" and report a bug
[    0.240000] vgaarb: loaded
[    0.240000] PCI: Using ACPI for IRQ routing
[    0.240000] PCI: System does not support PCI
[    0.240000] cfg80211: Calling CRDA to update world regulatory domain
[    0.240000] Switching to clocksource lguest
[    0.260000] pnp: PnP ACPI: disabled
[    0.270000] NET: Registered protocol family 2
[    0.270000] IP route cache hash table entries: 1024 (order: 0, 4096
bytes)
[    0.270000] TCP established hash table entries: 2048 (order: 2, 16384
bytes)
[    0.270000] TCP bind hash table entries: 2048 (order: 1, 8192 bytes)
[    0.270000] TCP: Hash tables configured (established 2048 bind 2048)
[    0.270000] TCP: reno registered
[    0.270000] UDP hash table entries: 256 (order: 0, 4096 bytes)
[    0.270000] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
[    0.270000] NET: Registered protocol family 1
[    0.270000] platform rtc_cmos: registered platform RTC device (no PNP
device found)
[    0.300000] VFS: Disk quotas dquot_6.5.2
[    0.300000] Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
[    0.300000] msgmni has been set to 112
[    0.300000] io scheduler noop registered
[    0.300000] io scheduler cfq registered (default)
[    0.300000] Mapping virtqueue 0 addr 4004000
[    0.300000] Mapping virtqueue 1 addr 4007000
[    0.310000] Linux agpgart interface v0.103
[    0.340000] [drm] Initialized drm 1.1.0 20060810
[    0.420000] brd: module loaded
[    0.479999] loop: module loaded
[    0.540000] Mapping virtqueue 0 addr 4001000
[    0.580000]  vda: unknown partition table
lguest: bad page table entry

-Earlence
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