linux-kernel - Re: [PATCH 2/4] KVM: selftests: x86: Use TAP interface in the sync

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Date:   Thu, 3 Aug 2023 07:23:59 +0200
From:   Thomas Huth <thuth@...hat.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        linux-kselftest@...r.kernel.org,
        David Matlack <dmatlack@...gle.com>
Subject: Re: [PATCH 2/4] KVM: selftests: x86: Use TAP interface in the
 sync_regs test

On 02/08/2023 23.31, Sean Christopherson wrote:
> On Wed, Aug 02, 2023, Sean Christopherson wrote:
>> Oh, and no need to post "KVM: selftests: Rename the ASSERT_EQ macro" in the next
>> version, I'm planning on grabbing that one straightaway.
> 
> After paging this all back in...
> 
> I would much prefer that we implement the KVM specific macros[*], e.g. KVM_ONE_VCPU_TEST(),
> and build on top of those.  I'm definitely ok doing a "slow" conversion, i.e. starting
> with a few easy tests.  IIRC at some point I said I strongly preferred an all-or-nothing
> approach, but realistically I don't think we'll make progress anytime soon if we try to
> boil the ocean.

At least I don't have enough spare time to do such a big conversion all at 
once - I'm only occasionally looking at the KVM selftests, mostly for s390x, 
and I also lack the knowledge how to test all those x86 tests. So don't 
expect such a big conversion from me, all I can provide is a small patch 
here or there.

> But I do think we should spend the time to implement the infrastructure right away.  We
> may end up having to tweak the infrastructure down the road, e.g. to convert other tests,
> but I would rather do that then convert some tests twice.
> 
> [*] https://lore.kernel.org/all/Y2v+B3xxYKJSM%2FfH@google.com

Sorry, I somehow completely missed that KVM_ONE_VCPU_TEST suggestion when 
picking up the series up again after working on other stuff for more than 
half a year. I'll try to incorporate this into the next version.

(the other patches don't need a fixture, so I think they shouldn't be 
affected by this?)

  Thomas