From mboxrd@z Thu Jan  1 00:00:00 1970
From: Gleb Natapov <gleb@redhat.com>
Subject: Re: [PATCH v6 00/15] Nested EPT
Date: Sun, 4 Aug 2013 16:44:35 +0300
Message-ID: <20130804134435.GR6042@redhat.com>
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	Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>,
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	Yang Zhang <yang.z.zhang@intel.com>, pbonzini@redhat.com
To: Jan Kiszka <jan.kiszka@web.de>
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On Sun, Aug 04, 2013 at 12:53:56PM +0300, Gleb Natapov wrote:
> On Sun, Aug 04, 2013 at 12:32:06PM +0300, Gleb Natapov wrote:
> > On Sun, Aug 04, 2013 at 11:24:41AM +0200, Jan Kiszka wrote:
> > > On 2013-08-01 16:08, Gleb Natapov wrote:
> > > > Another day -- another version of the nested EPT patches. In this version
> > > > included fix for need_remote_flush() with shadowed ept, set bits 6:8
> > > > of exit_qualification during ept_violation, update_permission_bitmask()
> > > > made to work with shadowed ept pages and other small adjustment according
> > > > to review comments.
> > > 
> > > Was just testing it here and ran into a bug: I've L2 accessing the HPET
> > > MMIO region that my L1 passed through from L0 (where it is supposed to
> > > be emulated in this setup). This used to work with an older posting of
> > Not sure I understand your setup. L0 emulates HPET, L1 passes it through
> > to L2 (mmaps it and creates kvm slot that points to it) and when L2
> > accessed it it locks up?
> > 
> > > Jun, but now it locks up (infinite loop over L2's MMIO access, no L2->L1
> > > transition). Any ideas where to look for debugging this?
> > > 
> > Can you do an ftrace -e kvm -e kvmmmu? Unit test will also be helpful :)
> > 
> I did an MMIO access from nested guest in the vmx unit test (which is
> naturally passed through to L0 since L1 is so simple) and I can see that
> the access hits L0.
> 
But then unit test not yet uses nested EPT :)

--
			Gleb.