linux-kernel - Re: Use CPUID to communicate with the hypervisor.

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:	Mon, 29 Sep 2008 13:31:30 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	akataria@...are.com
CC:	Gerd Hoffmann <kraxel@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	"avi@...hat.com" <avi@...hat.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Zach Amsden <zach@...are.com>,
	Daniel Hecht <dhecht@...are.com>,
	"Jun.Nakajima@...el.Com" <Jun.Nakajima@...el.Com>
Subject: Re: Use CPUID to communicate with the hypervisor.

Alok Kataria wrote:
> 
> How does that matter, if we are able to standardize all this then,
> hypervisors which want to run a Linux guest should effectively play by
> the standards over here or else they would never work properly on Linux.
> What we are trying to do here is try to standardize things for Linux so
> that the Linux kernel implementation for Virtualization is that much
> more easier. If this goes well other closed source hypervisors too can
> effectively follow these standards. 
> If the other closed source hypervisors define their own cpuid leafs they
> will still have to make Linux kernel side changes to make use of these
> new leafs. Which allows them to add to these pool of cpuid interface's
> too.
> 

I don't think this is a realistic point of view, especically given who 
we're dealing with in the closed-source world.

Without any kind of tagging of the information, it's realistically futile.

Intel/AMD haven't helped any by reserving a space which is entirely too 
small.

	-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/