linux-kernel - Re: [RFC PATCH 04/18] virt/mshv: request version ioctl

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Date:   Wed, 07 Apr 2021 16:02:56 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     Wei Liu <wei.liu@...nel.org>
Cc:     Nuno Das Neves <nunodasneves@...ux.microsoft.com>,
        linux-hyperv@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, mikelley@...rosoft.com,
        viremana@...ux.microsoft.com, sunilmut@...rosoft.com,
        wei.liu@...nel.org, ligrassi@...rosoft.com, kys@...rosoft.com
Subject: Re: [RFC PATCH 04/18] virt/mshv: request version ioctl

Wei Liu <wei.liu@...nel.org> writes:

> On Wed, Apr 07, 2021 at 09:38:21AM +0200, Vitaly Kuznetsov wrote:
>
>> One more though: it is probably a good idea to introduce selftests for
>> /dev/mshv (similar to KVM's selftests in
>> /tools/testing/selftests/kvm). Selftests don't really need a stable ABI
>> as they live in the same linux.git and can be updated in the same patch
>> series which changes /dev/mshv behavior. Selftests are very useful for
>> checking there are no regressions, especially in the situation when
>> there's no publicly available userspace for /dev/mshv.
>
> I think this can wait until we merge the first implementation in tree.
> There are still a lot of moving parts. Our (currently limited) internal
> test cases need more cleaning up before they are ready. I certainly
> don't want to distract Nuno from getting the foundation right.
>

I'm absolutely fine with this approach, selftests are a nice add-on, not
a requirement for the initial implementation. Also, to make them more
useful to mere mortals, a doc on how to run Linux as root Hyper-V
partition would come handy)

-- 
Vitaly