From: "Roedel, Joerg" <Joerg.Roedel@amd.com>
To: Jan Kiszka <jan.kiszka@web.de>
Cc: Avi Kivity <avi@redhat.com>,
Marcelo Tosatti <mtosatti@redhat.com>, kvm <kvm@vger.kernel.org>,
Gleb Natapov <gleb@redhat.com>
Subject: Re: [PATCH] KVM: SVM: Keep intercepting task switching with NPT enabled
Date: Tue, 1 Nov 2011 16:30:19 +0100 [thread overview]
Message-ID: <20111101153019.GH13244@amd.com> (raw)
In-Reply-To: <4EAFF6A5.8050308@web.de>
On Tue, Nov 01, 2011 at 09:39:49AM -0400, Jan Kiszka wrote:
> > So SVM does not guarantee that an intercept during a task-switch can be
> > restarted.
>
> Not a bug but still a deficit as it makes hardware-assisted task
> switching practically useless, no?
Not entirely. For hypervisors that can guarantee that there will be no
intercept (NPT pre-mapped, no exceptions intercepted) it will still
work.
Joerg
--
AMD Operating System Research Center
Advanced Micro Devices GmbH Einsteinring 24 85609 Dornach
General Managers: Alberto Bozzo, Andrew Bowd
Registration: Dornach, Landkr. Muenchen; Registerger. Muenchen, HRB Nr. 43632
next prev parent reply other threads:[~2011-11-01 15:31 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-18 16:23 [PATCH] KVM: SVM: Keep intercepting task switching with NPT enabled Jan Kiszka
2011-10-18 16:35 ` Roedel, Joerg
2011-10-18 17:37 ` Avi Kivity
2011-10-19 14:12 ` Roedel, Joerg
2011-11-01 11:13 ` Roedel, Joerg
2011-11-01 13:39 ` Jan Kiszka
2011-11-01 15:30 ` Roedel, Joerg [this message]
2011-11-01 15:49 ` Jan Kiszka
2011-11-01 16:15 ` Roedel, Joerg
2011-11-01 18:22 ` Jan Kiszka
2011-11-02 9:55 ` Roedel, Joerg
2011-11-02 9:59 ` Jan Kiszka
2011-11-02 10:04 ` Avi Kivity
2011-10-27 12:40 ` Marcelo Tosatti
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