From: Joerg Roedel <joerg.roedel@amd.com>
To: Kevin Wolf <kwolf@redhat.com>
Cc: <kvm@vger.kernel.org>, <gleb@redhat.com>,
<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: Tue, 24 Jan 2012 15:03:16 +0100 [thread overview]
Message-ID: <20120124140316.GD19255@amd.com> (raw)
In-Reply-To: <1327335048-31925-2-git-send-email-kwolf@redhat.com>
On Mon, Jan 23, 2012 at 05:10:46PM +0100, Kevin Wolf wrote:
> This patch fixes the problem for VMX. For SVM, the logic used to
> determine the source of the task switch is buggy, so we can't pass
> useful information to the emulator there and just disable the check in
> all cases.
Actually, SVM isn't buggy :) For SVM you do not need to do any
priviledge checks in software because the hardware already takes care of
that.
In other words, KVM only gets a task-switch intercept if the priviledges
are all checked and correct.
Joerg
--
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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:[~2012-01-24 14:03 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 [this message]
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
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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