From: Paolo Bonzini <pbonzini@redhat.com>
To: Abel Gordon <abel@stratoscale.com>
Cc: Hu Yaohui <loki2441@gmail.com>, Bandan Das <bsd@redhat.com>,
kvm <kvm@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Muli Ben-Yehuda <muli@stratoscale.com>
Subject: Re: KVM Nested L2 guest startup problems
Date: Wed, 07 May 2014 13:37:14 +0200 [thread overview]
Message-ID: <536A1AEA.9020309@redhat.com> (raw)
In-Reply-To: <CAESbUUyQJ=BF1otV7XY2VpiM5TH6AxMMqGWCwO0+Mk_51sX_BA@mail.gmail.com>
Il 07/05/2014 13:16, Abel Gordon ha scritto:
>> > PLE should be left enabled, I think.
> Well... the PLE settings L0 uses to run L1 (vmcs01) may be different
> than the PLE settings L1 configured to run L2 (vmcs12).
> For example, L0 can use a ple_gap to run L1 that is bigger than the
> ple_gap L1 configured to run L2. Or L0 can use a ple_window to run L1
> that is smaller than the ple_window L1 configured to run L2.
That's correct. We should leave PLE enabled while running L2, but hide
the feature altogether from L1.
Paolo
> So seems PLE should never be exposed to L1 or an appropriate nested
> handling needs to be implemented. Note the handling may become complex
> because in some cases a PLE exit from L2 should be handled directly by
> L0 and not passed to L1... remember nested preemption timer support :)
> ?
next prev parent reply other threads:[~2014-05-07 11:37 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-02 1:43 KVM Nested L2 guest startup problems Hu Yaohui
2014-05-02 9:53 ` Paolo Bonzini
2014-05-02 15:17 ` Hu Yaohui
2014-05-02 15:52 ` Paolo Bonzini
2014-05-02 17:07 ` Hu Yaohui
2014-05-02 18:39 ` Bandan Das
2014-05-02 20:11 ` Hu Yaohui
2014-05-04 14:57 ` Abel Gordon
2014-05-04 16:33 ` Hu Yaohui
2014-05-07 8:58 ` Paolo Bonzini
2014-05-07 11:16 ` Abel Gordon
2014-05-07 11:37 ` Paolo Bonzini [this message]
2014-05-07 11:40 ` Paolo Bonzini
2014-05-07 15:30 ` Abel Gordon
2014-05-07 15:41 ` Paolo Bonzini
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