Re: [PATCH v3 00/12] KVM: selftests: Add more syscall wrappers, fix hardware_disable_test

On Fri, 31 Jul 2026 12:56:00 -0700, Sean Christopherson wrote:
> Third time's a charm.  Sorry for the spam.
> 
> Buried in the middle of this is a fix for the hardware_disable_test where
> it can end up with a runtime of multiple minutes when running a preemptible
> kernels on a large NUMA system.  Turns out my analysis/guess in v1 was wrong;
> the problem isn't direct CPU contention, it's that letting the workers do any
> amount of "real" work on any CPUs leads to pthread_create() slowdowns from
> the perspective of the caller.
> 
> [...]

Applied to kvm-x86 selftests2, thanks!

[01/12] KVM: selftests: Add a KVM syscall wrapper for sched_setaffinity()
        https://github.com/kvm-x86/linux/commit/f766bf3d0ac8
[02/12] KVM: selftests: Set threads CPU affinity before doing work in hardware disable test
        https://github.com/kvm-x86/linux/commit/2887da61c42d
[03/12] KVM: selftests: Pre-set threads affinity in hardware disable test when possible
        https://github.com/kvm-x86/linux/commit/496779b54943
[04/12] KVM: selftests: Return the target CPU from pin_task_to_random_cpu()
        https://github.com/kvm-x86/linux/commit/8de0e85f654e
[05/12] KVM: selftests: Extract picking of random CPU from cpu_set_t to separate API
        https://github.com/kvm-x86/linux/commit/d58cc7bbc5a0
[06/12] KVM: selftests: Affine threads to random CPUs in hardware disable test
        https://github.com/kvm-x86/linux/commit/563416ea9ae4
[07/12] KVM: selftests: Drop unreachable, dead code from hardware disable test
        https://github.com/kvm-x86/linux/commit/bb0e7d84c4be
[08/12] KVM: selftests: Add KVM syscall wrapper for pthread_create()
        https://github.com/kvm-x86/linux/commit/5171573ce7cb
[09/12] KVM: selftests: Add KVM syscall wrappers for pthread_{cancel,join}()
        https://github.com/kvm-x86/linux/commit/bc9143135bf3
[10/12] KVM: selftests: Add helper APIs to cancel+join pthreads
        https://github.com/kvm-x86/linux/commit/939b20e5f35e
[11/12] KVM: selftests: Add KVM syscall wrappers for pthread_{g,s}etaffinity_np()
        https://github.com/kvm-x86/linux/commit/83b5065f3e1c
[12/12] KVM: selftests: Clean up global constants in hardware disable test
        https://github.com/kvm-x86/linux/commit/1039496ae75d

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https://github.com/kvm-x86/linux/tree/next