Re: [nvmx testing, linux on linux] Disabling EPT in L1 renders L2 stuck on boot

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On Fri, Oct 4, 2013 at 6:38 PM, Gleb Natapov <gleb@xxxxxxxxxx> wrote:
> On Fri, Oct 04, 2013 at 04:05:50PM +0300, Gleb Natapov wrote:
>> On Fri, Oct 04, 2013 at 06:03:33PM +0530, Kashyap Chamarthy wrote:
>> > On Fri, Oct 4, 2013 at 3:09 PM, Gleb Natapov <gleb@xxxxxxxxxx> wrote:
>> > > On Fri, Oct 04, 2013 at 03:03:17PM +0530, Kashyap Chamarthy wrote:
>> > >> Discussed with Gleb on IRC: I'll have to try with kvm.git
>> >
>> > I just compiled kernel from kvm.git queue on both L0 and L1.
>> >
>> > For completeness' sake, this how I did:
>> >
>> >     $ git describe
>> >     for-linus-12017-g8a3c1a33
>> >     $ git log | head -1
>> >     commit 8a3c1a33476f6bfebd07954e2277dbc88003bd37
>> >
>> >     $ git branch -d test_ept1 origin/queue
>> >     $ make -j6 && make bzImage && make modules
>> >     $ sudo make modules_install && make install
>> >
>> > (Rebooted both L0 and L1 into the new kernel)
>> >
>> > > and a simple
>> > >> qemu-kvm command line.
>> > >>
>> > > And try to disable shadow vmcs on the host just to rule it out.
>> >
>> >     $ cat /sys/module/kvm_intel/parameters/enable_shadow_vmcs
>> >     N
>> >
>> > The above didn't have any effect.
>> >
>> > No, booting L2 is still stuck.
>> >
>> > Not sure what's broken (if at all) here. Gleb, you mentioned you were
>> > able to test the MMU combination 'shadow on EPT' just fine with an F19
>> > liveCD without libvirt in-place. If you have still have that test
>> > environment, can you please post your qemu-kvm command line?
>> >
>> Something as basic as "qemu -m 2G -cdrom /path/to/image -cpu host

Thanks. I'll see if I can figure further what's going on here,
otherwise I'll just write a bug for now with all the details, just so
it's tracked. If it turns out to be a false alarm, I can just close
it.

>>
> And Live CD I use is XFCE based, not sure if it matters.

I'm using no X. So, it shouldn't matter :-)

>
> --
>                         Gleb.
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