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  PHC 
Open Source and information security mailing list archives
Hash Suite for Android: free password hash cracker in your pocket
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Wed, 05 Mar 2014 22:50:41 -0800
From:	"H. Peter Anvin" <>
To:	Muli Ben-Yehuda <>,
	WANG Chao <>
CC:	"Jon D. Mason" <>,
	Thomas Gleixner <>,
	Vivek Goyal <>,
	Yinghai Lu <>, Baoquan He <>,,,,
Subject: Re: How could we get rid of saved_max_pfn for calgary iommu?

On 03/05/2014 10:47 PM, Muli Ben-Yehuda wrote:
> On Wed, Mar 05, 2014 at 01:36:17PM +0800, WANG Chao wrote:
>> Hi, Muli
>> saved_max_pfn is becoming a setback for kexec-tools. Ideally calgary
>> could get rid of saved_max_pfn at all. But If this can't work, how
>> about exporting a calgary tce table size to user space, so that
>> kexec-tools can simply pass calgary=xxx cmdline to 2nd kernel.
> As Jon noted, this code is used to so that the TCE table remains
> consistent between the original and the kexec'd kernel. I see two
> options: either we hard code the TCE table size to the max so that
> this bit of code becomes redundant, or we explicitly pass the original
> table size (or the original max_pfn) to the kexec'd kernel. The first
> option is more appealing, because I don't think anyone is actually
> using the TCE table size -- we mostly added it for debugging the IOMMU
> TCE code at the time -- but since I don't have a Calgary machine
> anymore, I don't have any way to test it. The second option is uglier
> but would be fully backward-compatible and less likely to break
> things. Given that very few people are likely running the latest
> upstream kernel on Calgary/CalIOC2 machines, I'm inclined towards the
> first option.
>> BTW MAINTAINERS file still uses your old email, please update
>> accordingly.
> I think you are the first person to actually look up the Calgary
> maintainers in the last few years :-)

OK, second question... is it time to axe Calgary?


To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

Powered by blists - more mailing lists