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: <b5e340a1-c3de-6a44-50ce-68388c89febc@redhat.com>
Date:   Thu, 20 Apr 2017 12:01:33 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Paolo Bonzini <pbonzini@...hat.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     mingo@...nel.org, x86@...nel.org,
        Tiantian Feng <fengtiantian@...wei.com>,
        Xishi Qiu <qiuxishi@...wei.com>
Subject: Re: [PATCH v5] x86: call smp vmxoff in smp stop

On 19.04.2017 18:18, Paolo Bonzini wrote:
> From: Tiantian Feng <fengtiantian@...wei.com>
> 
> A CPU in VMX root mode will ignore INIT signals and fail to bring
> up the APs after reboot.  Therefore, on a panic we disable VMX on all
> CPUs before rebooting or triggering kdump.
> 
> Do this when halting the machine as well, in case a firmware-level reboot
> does not perform a cold reset for all processors.  Without doing this,
> rebooting the host may hang.

Guess this make sense, just wonder if something like that is actually
expected to work? Not doing a cold reset feels like leaving a lot of
stuff in an uninitialized state. Shouldn't that specific firmware then
care about performing any necessary resets?

-- 

Thanks,

David

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ