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 12:32:06 +0300
Message-ID: <20130804093205.GJ6042@redhat.com>
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Cc: kvm@vger.kernel.org,
	Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>,
	Jun Nakajima <jun.nakajima@intel.com>,
	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 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 :)

--
			Gleb.