linux-kernel - Re: [PATCH 3/4] KVM: MMU: reduce the size of mmu_page

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]

Message-ID: <56F54103.6020508@redhat.com>
Date:	Fri, 25 Mar 2016 14:45:39 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Xiao Guangrong <guangrong.xiao@...ux.intel.com>
Cc:	gleb@...nel.org, mtosatti@...hat.com, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] KVM: MMU: reduce the size of mmu_page_path

On 25/03/2016 14:19, Xiao Guangrong wrote:
> Currently only PT64_ROOT_LEVEL - 1 levels are used, one additional entry
> in .parent[] is used as a sentinel, the additional entry in .idx[] is
> purely wasted
> 
> This patch reduces its size and sets the sentinel on the upper level of
> the place where we start from

This patch and the previous one are basically redoing commit
0a47cd85833e ("KVM: MMU: Fix ubsan warnings", 2016-03-04).  While you
find your version easier to understand, I of course find mine easier.

Rather than getting stuck in a ko fight, the solution is to stick with
the code in KVM and add comments.  I'll give it a try...

Paolo