linux-kernel - Re: [PATCH] KVM: selftests: Don't fall over when only one CPU

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Message-ID: <aPZkLykr3L_cBeqN@google.com>
Date: Mon, 20 Oct 2025 09:32:47 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Paolo Bonzini <pbonzini@...hat.com>, Shuah Khan <shuah@...nel.org>, 
	Brendan Jackman <jackmanb@...gle.com>
Cc: kvm@...r.kernel.org, linux-kselftest@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: selftests: Don't fall over when only one CPU

On Wed, Oct 15, 2025, Sean Christopherson wrote:
> On Tue, 07 Oct 2025 19:12:31 +0000, Brendan Jackman wrote:
> > Running this test on a system with only one CPU is not a recipe for
> > success. However, there's no clear-cut reason why it absolutely
> > shouldn't work, so the test shouldn't completely reject such a platform.
> > 
> > At present, the *3/4 calculation will return zero on these platforms and
> > the test fails. So, instead just skip that calculation.
> > 
> > [...]
> 
> Applied to kvm-x86 selftests, thanks!
> 
> [1/1] KVM: selftests: Don't fall over when only one CPU
>       https://github.com/kvm-x86/linux/commit/98dea1b75186

FYI, I rebased this onto 6.18-rc2 so that I could apply selftests changes that
conflicted with fixes that went into -rc2 (yet another lesson learned about the
dangers of using -rc1 as a base).  New hash:

[1/1] KVM: selftests: Don't fall over in mmu_stress_test when only one CPU is present
      https://github.com/kvm-x86/linux/commit/b146b289f759