Re: [Xen-devel] [XTF PATCH 00/16] Add test cases for nested vmxon

[Haozhong Zhang <haozhong.zhang@xxxxxxxxx>]

On 12/16/16 14:12 +0000, Andrew Cooper wrote:
> On 16/12/16 13:43, Haozhong Zhang wrote:
> > This patch series starts to add a test selection "test-hvm64-vvmx" for
> > nested VMX. This first series focuses mostly on nested vmxon.
> >
> > * Patch 01 - 03 test the basic environment (cpuid and MSR).
> >
> > * Patch 04 - 05 add functions to execute VMX instructions and to
> >   collect and handle errors.
> >
> > * Patch 06 - 16 construct a bunch of test cases for nested vmxon per
> >   its pseudo code in section "VMXON - Enter VMX Operation" of Intel
> >   SDM Vol 3.
> Thankyou very much for contributing this.
>
> As a general question though, how have you found using XTF?  I am eager
> for any feedback, especially if you found problem areas.
Lars Kurth and George Dunlap visited out site recently and mentioned
XTF. When I started to look at and fix nested VMX bugs, I used KVM as
L1 hypervisor. However, KVM is sometimes too heavy and not quite
controllable for the quick verification and test, so I turned to XTF and
found it was exactly what I wanted for this purpose.

So far I feel XTF is pretty handy for me to construct quick and short
test cases for VMX instructions.

One feature I desire is to configure the dependency among tests. Take
this patch series as an example: some tests in patch 09 - 16 make
sense only when VMX is available. If I can indicate they depend on the
successful result of tests in patch 01 - 03, then I can separate patch
01 - 03 and patch 09 - 16 into two test selections, and will not need
to introduce additional code in patch 09 - 16 to check the availability
of VMX.

Thanks,
Haozhong

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