From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jan Kiszka <jan.kiszka@web.de>
Subject: Re: [PATCH] KVM: SVM: Keep intercepting task switching with NPT enabled
Date: Tue, 01 Nov 2011 16:49:42 +0100
Message-ID: <4EB01516.2070402@web.de>
References: <4E9DA7EF.30804@siemens.com> <20111018163516.GO2198@amd.com> <4E9DB95C.1030105@redhat.com> <20111101111335.GD13244@amd.com> <4EAFF6A5.8050308@web.de> <20111101153019.GH13244@amd.com>
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Cc: Avi Kivity <avi@redhat.com>, Marcelo Tosatti <mtosatti@redhat.com>,
	kvm <kvm@vger.kernel.org>, Gleb Natapov <gleb@redhat.com>
To: "Roedel, Joerg" <Joerg.Roedel@amd.com>
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On 2011-11-01 16:30, Roedel, Joerg wrote:
> 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?
>=20
> Not entirely. For hypervisors that can guarantee that there will be no
> intercept (NPT pre-mapped, no exceptions intercepted) it will still
> work.

Yes, but that only covers the niche of simple static ones (partitioning
hypervisors).

Jan


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