[Xen-devel] isolinux problems - Intel VT

["Jan Beulich" <jbeulich@xxxxxxxxxx>]

As previously described, newer isolinux (as used in openSuSE 10.2) exposes
issues with emulation, specifically (but perhaps not restricted to) non-flat
protected mode.

While we are looking into this, and supposedly Intel folks are too, any help
or specifically pointers to possible problematic areas from people knowing
this code better than we do would be greatly appreciated.

Currently, this is what I get:

(XEN) (file=hvm.c, line=195) Allocated port 3 for hvm.
(XEN) (file=memory.c, line=180) Dom9 freeing in-use page 1242ed (pseudophys 
a0): count=2 type=0
(XEN) (file=memory.c, line=180) Dom9 freeing in-use page 1242ec (pseudophys 
a1): count=2 type=0
(XEN) (file=memory.c, line=180) Dom9 freeing in-use page 1242eb (pseudophys 
a2): count=2 type=0
(XEN) (file=memory.c, line=180) Dom9 freeing in-use page 1242ea (pseudophys 
a3): count=2 type=0
(XEN) (file=memory.c, line=180) Dom9 freeing in-use page 1242e9 (pseudophys 
a4): count=2 type=0
(XEN) (file=memory.c, line=180) Dom9 freeing in-use page 1242e8 (pseudophys 
a5): count=2 type=0
(XEN) (file=memory.c, line=180) Dom9 freeing in-use page 1242e7 (pseudophys 
a6): count=2 type=0
(XEN) (file=memory.c, line=180) Dom9 freeing in-use page 1242e6 (pseudophys 
a7): count=2 type=0
(XEN) (file=memory.c, line=180) Dom9 freeing in-use page 1242e5 (pseudophys 
a8): count=2 type=0
(XEN) (file=memory.c, line=180) Dom9 freeing in-use page 1242e4 (pseudophys 
a9): count=2 type=0
(XEN) (file=memory.c, line=180) Dom9 freeing in-use page 1242e3 (pseudophys 
aa): count=2 type=0
(XEN) (file=memory.c, line=180) Dom9 freeing in-use page 1242e2 (pseudophys 
ab): count=2 type=0
(XEN) (file=memory.c, line=180) Dom9 freeing in-use page 1242e1 (pseudophys 
ac): count=2 type=0
(XEN) (file=memory.c, line=180) Dom9 freeing in-use page 1242e0 (pseudophys 
ad): count=2 type=0
(XEN) (file=memory.c, line=180) Dom9 freeing in-use page 1242df (pseudophys 
ae): count=2 type=0
(XEN) (file=memory.c, line=180) Dom9 freeing in-use page 1242de (pseudophys 
af): count=2 type=0
(XEN) (file=memory.c, line=180) Dom9 freeing in-use page 1242dd (pseudophys 
b0): count=2 type=0
(XEN) (file=memory.c, line=180) Dom9 freeing in-use page 1242dc (pseudophys 
b1): count=2 type=0
(XEN) (file=memory.c, line=180) Dom9 freeing in-use page 1242db (pseudophys 
b2): count=2 type=0
(XEN) (file=memory.c, line=180) Dom9 freeing in-use page 1242da (pseudophys 
b3): count=2 type=0
(XEN) (file=memory.c, line=180) Dom9 freeing in-use page 1242d9 (pseudophys 
b4): count=2 type=0
(XEN) (file=memory.c, line=180) Dom9 freeing in-use page 1242d8 (pseudophys 
b5): count=2 type=0
(XEN) (file=memory.c, line=180) Dom9 freeing in-use page 1242d7 (pseudophys 
b6): count=2 type=0
(XEN) (file=memory.c, line=180) Dom9 freeing in-use page 1242d6 (pseudophys 
b7): count=2 type=0
(XEN) (file=memory.c, line=180) Dom9 freeing in-use page 1242d5 (pseudophys 
b8): count=2 type=0
(XEN) (file=memory.c, line=180) Dom9 freeing in-use page 1242d4 (pseudophys 
b9): count=2 type=0
(XEN) (file=memory.c, line=180) Dom9 freeing in-use page 1242d3 (pseudophys 
ba): count=2 type=0
(XEN) (file=memory.c, line=180) Dom9 freeing in-use page 1242d2 (pseudophys 
bb): count=2 type=0
(XEN) (file=memory.c, line=180) Dom9 freeing in-use page 1242d1 (pseudophys 
bc): count=2 type=0
(XEN) (file=memory.c, line=180) Dom9 freeing in-use page 1242d0 (pseudophys 
bd): count=2 type=0
(XEN) (file=memory.c, line=180) Dom9 freeing in-use page 1242cf (pseudophys 
be): count=2 type=0
(XEN) (file=memory.c, line=180) Dom9 freeing in-use page 1242ce (pseudophys 
bf): count=2 type=0
(XEN) vmx_do_launch(): GUEST_CR3<=002c97a0, HOST_CR3<=2bcbb3000
(XEN) (GUEST: 9) HVM Loader
(XEN) (GUEST: 9) Loading ROMBIOS ...
(XEN) (GUEST: 9) Loading Cirrus VGABIOS ...
(XEN) (GUEST: 9) Loading VMXAssist ...
(XEN) (GUEST: 9) VMX go ...
(XEN) (GUEST: 9) VMXAssist (Oct  6 2006)
(XEN) (GUEST: 9) Memory size 512 MB
(XEN) (GUEST: 9) E820 map:
(XEN) (GUEST: 9) 0000000000000000 - 000000000009F000 (RAM)
(XEN) (GUEST: 9) 000000000009F000 - 00000000000A0000 (Reserved)
(XEN) (GUEST: 9) 00000000000A0000 - 00000000000C0000 (Type 16)
(XEN) (GUEST: 9) 00000000000F0000 - 0000000000100000 (Reserved)
(XEN) (GUEST: 9) 0000000000100000 - 000000001FFF0000 (RAM)
(XEN) (GUEST: 9) 000000001FFF0000 - 000000001FFFA000 (ACPI Data)
(XEN) (GUEST: 9) 000000001FFFA000 - 000000001FFFD000 (ACPI NVS)
(XEN) (GUEST: 9) 000000001FFFD000 - 000000001FFFE000 (Type 19)
(XEN) (GUEST: 9) 000000001FFFE000 - 000000001FFFF000 (Type 18)
(XEN) (GUEST: 9) 000000001FFFF000 - 0000000020000000 (Type 17)
(XEN) (GUEST: 9) 00000000FEC00000 - 0000000100000000 (Type 16)
(XEN) (GUEST: 9) 
(XEN) (GUEST: 9) Start BIOS ...
(XEN) (GUEST: 9) Starting emulated 16-bit real-mode: ip=F000:FFF0
(XEN) (GUEST: 9)  rombios.c,v 1.138 2005/05/07 15:55:26 vruppert Exp $
(XEN) (GUEST: 9) Remapping master: ICW2 0x8 -> 0x20
(XEN) (GUEST: 9) Remapping slave: ICW2 0x70 -> 0x28
(XEN) (GUEST: 9) VGABios $Id: vgabios.c,v 1.61 2005/05/24 16:50:50 vruppert Exp 
$
(XEN) (GUEST: 9) HVMAssist BIOS, 1 cpu, $Revision: 1.138 $ $Date: 2005/05/07 
15:55:26 $
(XEN) (GUEST: 9) 
(XEN) (GUEST: 9) ata0-0: PCHS=8322/16/63 translation=lba LCHS=522/255/63
(XEN) (GUEST: 9) ata0 master: QEMU HARDDISK ATA-7 Hard-Disk (4096 MBytes)
(XEN) (GUEST: 9) ata0  slave: Unknown device
(XEN) (GUEST: 9) ata1 master: QEMU CD-ROM ATAPI-4 CD-Rom/DVD-Rom
(XEN) (GUEST: 9) ata1  slave: Unknown device
(XEN) (GUEST: 9) 
(XEN) (GUEST: 9) Booting from CD-Rom...
(XEN) (GUEST: 9) Trap (0xC) while in real mode
(XEN) (GUEST: 9) eax        8220 ecx          30 edx           0 ebx      800000
(XEN) (GUEST: 9) esp       D6914 ebp        200C esi       5521E edi       5521E
(XEN) (GUEST: 9) eip         102 eflags    33002 cs         4004 ds            0
(XEN) (GUEST: 9) es            0 fs            0 uss        5321 uesp   FFFA0001
(XEN) (GUEST: 9) ves        4004 vds        4004 vfs           0 vgs           0
(XEN) (GUEST: 9) trapno        C errno         0
(XEN) (GUEST: 9) cr0       50032 cr2           0 cr3           0 cr4         651
(XEN) (GUEST: 9) Halt called from %eip 0xD0382

Note the entirely broken stack pointer (uesp).

Using the mini ISO (or alternatively the full first installation medium) 
provided
with the openSuSE betas or RC1 is sufficient to reproduce the problem.

Attached patch shows the current state of fixing, which gets things going on
AMD-V. This is against 3.0.3 (and specifically not cleaned up to apply against
current -unstable) and known to not address all problems in that area, yet,
although the fact that things now work on AMD-V indicates that the remaining
problem(s) is/are likely in VMX specific code, within which, except for the odd
check_for_null_selector() (for which I sent a separate mail yesterday,
unfortunately without having got a reply from any Intel engineer so far), no
other obvious areas that need fixing have been identified.

Thanks,
Jan

Attachment: non-flat-pm.patch
Description: Text document

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