linux-kernel - Re: [Xen-devel] Re: [PATCH 00 of 36] x86/paravirt: groundwork for 64-bit Xen support

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Date:	Sun, 29 Jun 2008 10:43:18 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Nick Piggin <npiggin@...e.de>, Mark McLoughlin <markmc@...hat.com>,
	xen-devel <xen-devel@...ts.xensource.com>,
	Eduardo Habkost <ehabkost@...hat.com>,
	Vegard Nossum <vegard.nossum@...il.com>,
	Stephen Tweedie <sct@...hat.com>, x86@...nel.org,
	LKML <linux-kernel@...r.kernel.org>,
	Yinghai Lu <yhlu.kernel@...il.com>
Subject: Re: [Xen-devel] Re: [PATCH 00 of 36] x86/paravirt: groundwork for
	64-bit Xen support


* Jeremy Fitzhardinge <jeremy@...p.org> wrote:

> Subject: x86_64: fix non-paravirt compilation

i've put tip/x86/xen-64bit into tip/master briefly and it quickly 
triggered this crash on 64-bit x86:

Linux version 2.6.26-rc8-tip-00241-gc6c8cb2-dirty (mingo@...ne)
 (gcc version 4.2.3) #12303 SMP Sun Jun 29 10:30:01 CEST 2008

Command line: root=/dev/sda6 console=ttyS0,115200 earlyprintk=serial,ttyS0,115200 debug initcall_debug apic=verbose sysrq_always_enabled ignore_loglevel selinux=0
BIOS-provided physical RAM map:
 BIOS-e820: 0000000000000000 - 000000000009f800 (usable)
 BIOS-e820: 000000000009f800 - 00000000000a0000 (reserved)
 BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
 BIOS-e820: 0000000000100000 - 000000003fff0000 (usable)
 BIOS-e820: 000000003fff0000 - 000000003fff3000 (ACPI NVS)
 BIOS-e820: 000000003fff3000 - 0000000040000000 (ACPI data)
 BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)
 BIOS-e820: 00000000fec00000 - 0000000100000000 (reserved)
KERNEL supported cpus:
  Intel GenuineIntel
  AMD AuthenticAMD
  Centaur CentaurHauls
console [earlyser0] enabled
debug: ignoring loglevel setting.
Entering add_active_range(0, 0x0, 0x9f) 0 entries of 25600 used
Entering add_active_range(0, 0x100, 0x3fff0) 1 entries of 25600 used
last_pfn = 0x3fff0 max_arch_pfn = 0x3ffffffff
init_memory_mapping
kernel direct mapping tables up to 3fff0000 @ 8000-a000
PANIC: early exception 0e rip 10:ffffffff804b24e2 error 0 cr2 ffffffffff300000
Pid: 0, comm: swapper Not tainted 2.6.26-rc8-tip-00241-gc6c8cb2-dirty #12303

Call Trace:
 [<ffffffff80efe196>] early_idt_handler+0x56/0x6a
 [<ffffffff804b24e2>] ? __memcpy_fromio+0x12/0x30
 [<ffffffff804b24d9>] ? __memcpy_fromio+0x9/0x30
 [<ffffffff80f32f27>] dmi_scan_machine+0x57/0x1b0
 [<ffffffff80f02c15>] setup_arch+0x3f5/0x5e0
 [<ffffffff80efedd5>] start_kernel+0x75/0x350
 [<ffffffff80efe289>] x86_64_start_reservations+0x89/0xa0
 [<ffffffff80efe397>] x86_64_start_kernel+0xf7/0x100

RIP 0x10

with this config:

  http://redhat.com/~mingo/misc/config-Sun_Jun_29_10_29_11_CEST_2008.bad

i've saved the merged 2.6.26-rc8-tip-00241-gc6c8cb2-dirty tree into 
tip/tmp.x86.xen-64bit.Sun_Jun_29_10 and pushed it out, so you can test 
that exact version.

	Ingo
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