linux-kernel - Re: [PATCH] KVM: selftests: Enable USERFAULTFD

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Message-ID: <Y+FZvpxO62F9d2Ui@linux.dev>
Date:   Mon, 6 Feb 2023 19:49:18 +0000
From:   Oliver Upton <oliver.upton@...ux.dev>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     Mark Brown <broonie@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Shuah Khan <shuah@...nel.org>, kvm@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        anup@...infault.org
Subject: Re: [PATCH] KVM: selftests: Enable USERFAULTFD

On Mon, Feb 06, 2023 at 06:15:16PM +0000, Sean Christopherson wrote:
> On Mon, Feb 06, 2023, Oliver Upton wrote:
> > +cc x86, riscv as they're also affected.
> > 
> > On Thu, Feb 02, 2023 at 09:01:36PM +0000, Mark Brown wrote:
> > > The page_fault_test KVM selftest requires userfaultfd but the config
> > > fragment for the KVM selftests does not enable it, meaning that those tests
> > > are skipped in CI systems that rely on appropriate settings in the config
> > > fragments except on S/390 which happens to have it in defconfig. Enable
> > > the option in the config fragment so that the tests get run.
> 
> What do CI systems do for HugeTLB and THP?  Those are the other config options I
> can think of where there are very interesting interactions from a KVM perspective,
> but where KVM doesn't have a strict dependency on the feature.
> 
> E.g. x86_64_defconfig selects CONFIG_HUGETLBFS=y, but I don't see anything for THP,
> and AFAICT TRANSPARENT_HUGEPAGE is default=n.

Looks like arm64 defconfig enables THP and hugetlb. Regardless, I think
it would be valuable if our Kconfig fragment expressed the options that
buy us additional code coverage.

--
Thanks,
Oliver