linux-kernel - Re: qemu core dump and filtering guest pages

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] [day] [month] [year] [list]

Date:	Wed, 23 May 2012 11:37:42 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Christian Borntraeger <borntraeger@...ibm.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	KVM list <kvm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...hat.com>
Subject: Re: qemu core dump and filtering guest pages

On 05/23/2012 12:05 AM, Christian Borntraeger wrote:
> Folks,
> 
> today we discussed the situation of a qemu crash (with coredump) and big guests.
> Quite often the guest pages are not needed but make the core file pretty big.
> 
> The most appealing proposal that we had was to adopt the core file code in the 
> kernel to have an option for discarding guest pages (e.g. /proc/sys/core_guest).
> do_corefile would have a callback into the kvm module that could use its memory 
> slot infrastructure to decide if this page should be saved or not.
> 
> Would you consider such a change be ok? Any better idea?


There's MADV_DONTDUMP which can be used to control this on a per-guest
basis.


-- 
error compiling committee.c: too many arguments to function
--
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/