linux-kernel - Re: KVM Nested L2 guest startup problems

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Message-ID: <536A1B91.2070103@redhat.com>
Date:	Wed, 07 May 2014 13:40:01 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Abel Gordon <abel@...atoscale.com>
CC:	Hu Yaohui <loki2441@...il.com>, Bandan Das <bsd@...hat.com>,
	kvm <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Muli Ben-Yehuda <muli@...atoscale.com>
Subject: Re: KVM Nested L2 guest startup problems

Il 07/05/2014 13:37, Paolo Bonzini ha scritto:
> 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.

... which we already do.  The only secondary execution controls we allow 
are APIC page, unrestricted guest, WBINVD exits, and of course EPT.

Paolo
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