linux-kernel - Re: [PATCH v6 2/2] KVM: nVMX: nested TPR shadow/threshold emulation

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Message-ID: <53F700F7.8020909@redhat.com>
Date:	Fri, 22 Aug 2014 10:36:07 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Wanpeng Li <wanpeng.li@...ux.intel.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	Gleb Natapov <gleb@...nel.org>,
	Zhang Yang <yang.z.zhang@...el.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 2/2] KVM: nVMX: nested TPR shadow/threshold emulation

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
> 

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

But the manual says that "if the “use TPR shadow” VM-execution control
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
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