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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 14 Dec 2012 12:44:21 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Borislav Petkov <bp@...en8.de>,
	"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 12/14/2012 12:14 PM, Yinghai Lu wrote:
> On Fri, Dec 14, 2012 at 12:08 PM, Yinghai Lu <yinghai@...nel.org> wrote:
>> On Fri, Dec 14, 2012 at 12:04 PM, Yinghai Lu <yinghai@...nel.org> wrote:
>>> On Fri, Dec 14, 2012 at 11:46 AM, H. Peter Anvin <hpa@...or.com> wrote:
>>>>
>>>> I suspect we don't need init_level4_pgt at all and should just plan to
>>>> get rid of it.  Is there any reason we can't just build the proper
>>>> kernel page table set in pagetable_init() and switch to it there?
>>>
>>> then how to pass the info to AP?
>>
>> also we should merge early_level4_pgt with init_level4_pgt.
>>
>> and #PE handler could just extend to use BRK ...
>>
>> but need to make sure BRK get mapped at first, and BRK could cross the
>> 1G, 512G boundary ...
>>
>> that could make things less impact to all.
> 
> your current switchover setup in arch/x86/kernel/head_64.S could
> handle above 512g and cross boundary?
> 

Yes, that's the purpose of the funny aliasing games I play there.

	-hpa

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/