From: Paolo Bonzini <pbonzini@redhat.com>
To: Wanpeng Li <wanpeng.li@linux.intel.com>
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
Subject: Re: [PATCH v6 2/2] KVM: nVMX: nested TPR shadow/threshold emulation
Date: Fri, 22 Aug 2014 10:36:07 +0200 [thread overview]
Message-ID: <53F700F7.8020909@redhat.com> (raw)
In-Reply-To: <20140821233029.GA2420@kernel>
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
next prev parent reply other threads:[~2014-08-22 8:36 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-21 11:46 [PATCH v6 1/2] KVM: nVMX: introduce nested_get_vmcs12_pages Wanpeng Li
2014-08-21 11:46 ` [PATCH v6 2/2] KVM: nVMX: nested TPR shadow/threshold emulation Wanpeng Li
2014-08-21 12:33 ` Paolo Bonzini
2014-08-21 23:30 ` Wanpeng Li
2014-08-22 8:36 ` Paolo Bonzini [this message]
2014-08-22 8:44 ` Wanpeng Li
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