linux-kernel - Re: [tip:x86/microcode] x86/microcode_intel_early.c: Early update ucode on Intel's CPU

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Date:	Thu, 13 Dec 2012 13:36:58 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Borislav Petkov <bp@...en8.de>, Yinghai Lu <yinghai@...nel.org>,
	"Yu, Fenghua" <fenghua.yu@...el.com>,
	"mingo@...nel.org" <mingo@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"hpa@...ux.intel.com" <hpa@...ux.intel.com>,
	"linux-tip-commits@...r.kernel.org" 
	<linux-tip-commits@...r.kernel.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Stefano Stabellini <Stefano.Stabellini@...citrix.com>
Subject: Re: [tip:x86/microcode] x86/microcode_intel_early.c: Early update
 ucode on Intel's CPU

On 12/13/2012 11:13 AM, Borislav Petkov wrote:
> On Wed, Dec 12, 2012 at 09:26:47PM -0800, H. Peter Anvin wrote:
>>
>> Well, minus a simple brainfart now it actually gets into the page
>> table setup.
>
> If by this you mean that you can only see
>
> "Decompressing Linux...
> Parsing ELF.."
>
> and then the VM reboots (running it in KVM) then ok, I'm seeing this
> here too.
>

: tazenda 111 ; qemu-kvm -smp 2 -m 2048 -hda 
~/qemu/fc10/qemu-fc10-64.img -serial stdio -kernel 
o.x86_64/arch/x86/boot/bzImage -append 'ro root=/dev/sda1 console=ttyS0 
earlyprintk=serial,ttyS0 debug'
early console in setup code
early console in decompress_kernel

Decompressing Linux... Parsing ELF... done.
Booting the kernel.
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpu
[    0.000000] Linux version 3.7.0+ (hpa@...enda.hos.anvin.org) (gcc 
version 4.7.2 20120921 (Red Hat 4.7.2-2) (GCC) ) #16 SMP Wed Dec 12 
21:24:54 PST 2012
[    0.000000] Command line: ro root=/dev/sda1 console=ttyS0 
earlyprintk=serial,ttyS0 debug
[    0.000000] e820: BIOS-provided physical RAM map:
[    0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009fbff] usable
[    0.000000] BIOS-e820: [mem 0x000000000009fc00-0x000000000009ffff] 
reserved
[    0.000000] BIOS-e820: [mem 0x00000000000f0000-0x00000000000fffff] 
reserved
[    0.000000] BIOS-e820: [mem 0x0000000000100000-0x000000007fffdfff] usable
[    0.000000] BIOS-e820: [mem 0x000000007fffe000-0x000000007fffffff] 
reserved
[    0.000000] BIOS-e820: [mem 0x00000000feffc000-0x00000000feffffff] 
reserved
[    0.000000] BIOS-e820: [mem 0x00000000fffc0000-0x00000000ffffffff] 
reserved
[    0.000000] bootconsole [earlyser0] enabled
[    0.000000] NX (Execute Disable) protection: active
[    0.000000] DMI 2.4 present.
[    0.000000] DMI: Bochs Bochs, BIOS Bochs 01/01/2011
[    0.000000] e820: update [mem 0x00000000-0x0000ffff] usable ==> reserved
[    0.000000] e820: remove [mem 0x000a0000-0x000fffff] usable
[    0.000000] No AGP bridge found
[    0.000000] e820: last_pfn = 0x7fffe max_arch_pfn = 0x400000000
[    0.000000] MTRR default type: write-back
[    0.000000] MTRR fixed ranges enabled:
[    0.000000]   00000-9FFFF write-back
[    0.000000]   A0000-BFFFF uncachable
[    0.000000]   C0000-FFFFF write-protect
[    0.000000] MTRR variable ranges enabled:
[    0.000000]   0 base 00E0000000 mask FFE0000000 uncachable
[    0.000000]   1 disabled
[    0.000000]   2 disabled
[    0.000000]   3 disabled
[    0.000000]   4 disabled
[    0.000000]   5 disabled
[    0.000000]   6 disabled
[    0.000000]   7 disabled
[    0.000000] PAT not supported by CPU.
[    0.000000] found SMP MP-table at [mem 0x000fdae0-0x000fdaef] mapped 
at [ffff8800000fdae0]
[    0.000000] initial memory mapped: [mem 0x00000000-0xffffffffffffffff]
[    0.000000] Base memory trampoline at [ffff880000099000] 99000 size 24576
[    0.000000] init_memory_mapping: [mem 0x00000000-0x7fffdfff]
[    0.000000]  [mem 0x00000000-0x7fdfffff] page 2M
[    0.000000]  [mem 0x7fe00000-0x7fffdfff] page 4k
[    0.000000] Kernel panic - not syncing: Cannot find space for the 
kernel page tables
[    0.000000] Pid: 0, comm: swapper Not tainted 3.7.0+ #16
[    0.000000] Call Trace:
[    0.000000]  [<ffffffff817f0d2e>] panic+0xb6/0x1b5
[    0.000000]  [<ffffffff817e3801>] init_memory_mapping+0x471/0x5a0
[    0.000000]  [<ffffffff81ecd37f>] setup_arch+0x65c/0xb71
[    0.000000]  [<ffffffff81ec998e>] start_kernel+0x8a/0x348
[    0.000000]  [<ffffffff81ec9452>] x86_64_start_reservations+0x132/0x136
[    0.000000]  [<ffffffff81ec94fe>] x86_64_start_kernel+0xa8/0xad



-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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