From: Joerg Roedel <joerg.roedel@amd.com>
To: Kevin Wolf <kwolf@redhat.com>
Cc: Gleb Natapov <gleb@redhat.com>, <kvm@vger.kernel.org>,
<yoshikawa.takuya@oss.ntt.co.jp>, <avi@redhat.com>,
<mtosatti@redhat.com>
Subject: Re: [PATCH 1/3] KVM: x86 emulator: Fix task switch privilege checks
Date: Fri, 27 Jan 2012 14:34:56 +0100 [thread overview]
Message-ID: <20120127133456.GN19255@amd.com> (raw)
In-Reply-To: <4F229F7E.5030905@redhat.com>
On Fri, Jan 27, 2012 at 01:58:38PM +0100, Kevin Wolf wrote:
> Am 25.01.2012 17:00, schrieb Joerg Roedel:
> I just retried. I use kvm-kmod and kvm.git with HEAD at ff92e9b5 plus
> the tree patches of this series plus a printk to output exit_int_info in
> task_switch_intercept(). I ran taskswitch2 from kvm-unittests and got
> two failures and my VM86 unit test which hung when trying to return from
> VM86. I also ran the kernel that made me aware of the issue initially.
> All debug messages show exit_int_info = 0.
Okay, you are testing on a K8 which has exactly this bug. As I just
found out it is documented as erratum 701. The good news is that this
only happens on K8 and Fam11h, any later AMD processor doesn't have this
bug.
Joerg
--
AMD Operating System Research Center
Advanced Micro Devices GmbH Einsteinring 24 85609 Dornach
General Managers: Alberto Bozzo
Registration: Dornach, Landkr. Muenchen; Registerger. Muenchen, HRB Nr. 43632
next prev parent reply other threads:[~2012-01-27 13:35 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-23 16:10 [PATCH 0/3] Fix task switches into/out of VM86 Kevin Wolf
2012-01-23 16:10 ` [PATCH 1/3] KVM: x86 emulator: Fix task switch privilege checks Kevin Wolf
2012-01-24 9:52 ` Gleb Natapov
2012-01-24 10:09 ` Kevin Wolf
2012-01-24 10:17 ` Gleb Natapov
2012-01-24 10:38 ` Kevin Wolf
2012-01-24 10:52 ` Gleb Natapov
2012-01-24 11:23 ` Kevin Wolf
2012-01-24 11:25 ` Gleb Natapov
2012-01-24 14:03 ` Joerg Roedel
2012-01-24 14:15 ` Kevin Wolf
2012-01-24 14:16 ` Gleb Natapov
2012-01-24 14:24 ` Kevin Wolf
2012-01-24 16:23 ` Gleb Natapov
2012-01-25 16:00 ` Joerg Roedel
2012-01-25 18:29 ` Gleb Natapov
2012-01-27 12:58 ` Kevin Wolf
2012-01-27 13:34 ` Joerg Roedel [this message]
2012-01-27 13:55 ` Kevin Wolf
2012-01-27 14:17 ` Joerg Roedel
2012-01-27 15:02 ` Kevin Wolf
2012-01-27 15:45 ` Gleb Natapov
2012-01-23 16:10 ` [PATCH 2/3] KVM: x86 emulator: VM86 segments must have DPL 3 Kevin Wolf
2012-01-23 16:10 ` [PATCH 3/3] KVM: x86 emulator: Allow PM/VM86 switch during task switch Kevin Wolf
2012-01-24 10:57 ` Gleb Natapov
2012-01-24 11:31 ` Kevin Wolf
2012-01-24 11:37 ` Gleb Natapov
2012-01-24 11:44 ` Kevin Wolf
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