From mboxrd@z Thu Jan  1 00:00:00 1970
From: Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: [PATCH v6 2/2] KVM: nVMX: nested TPR shadow/threshold emulation
Date: Fri, 22 Aug 2014 10:36:07 +0200
Message-ID: <53F700F7.8020909@redhat.com>
References: <1408621610-9665-1-git-send-email-wanpeng.li@linux.intel.com> <1408621610-9665-2-git-send-email-wanpeng.li@linux.intel.com> <53F5E720.9000308@redhat.com> <20140821233029.GA2420@kernel>
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Cc: Marcelo Tosatti <mtosatti@redhat.com>,
	Gleb Natapov <gleb@kernel.org>,
	Zhang Yang <yang.z.zhang@intel.com>, kvm@vger.kernel.org,
	linux-kernel@vger.kernel.org
To: Wanpeng Li <wanpeng.li@linux.intel.com>
Return-path: <linux-kernel-owner@vger.kernel.org>
In-Reply-To: <20140821233029.GA2420@kernel>
Sender: linux-kernel-owner@vger.kernel.org
List-Id: kvm.vger.kernel.org

Il 22/08/2014 01:30, Wanpeng Li ha scritto:
> Maybe I misunderstand your comments "On real hardware you could point
> the virtual-APIC page to an invalid address."
> http://lists.openwall.net/linux-kernel/2014/08/07/344
>=20

That referred to an address that doesn't correspond to RAM.  You can us=
e
addresses like these in a real processor.

But the manual says that "if the =93use TPR shadow=94 VM-execution cont=
rol
is 1, VM entry ensures that the virtual-APIC address is 4-KByte aligned=
"
(24.6.8 Controls For APIC Virtualization).  This is the check that is
missing.

Paolo