linux-kernel - Re: [PATCH v3 0/4] KVM: arm64: selftests: arch_timer_edge

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Message-ID: <8f15a5d6-0f73-194a-8fa2-b7ba8cc8c5b2@redhat.com>
Date: Tue, 10 Jun 2025 15:50:53 +0200 (CEST)
From: Sebastian Ott <sebott@...hat.com>
To: Miguel Luis <miguel.luis@...cle.com>
cc: Marc Zyngier <maz@...nel.org>, Oliver Upton <oliver.upton@...ux.dev>, 
    Colton Lewis <coltonlewis@...gle.com>, 
    Ricardo Koller <ricarkol@...gle.com>, Joey Gouly <joey.gouly@....com>, 
    Suzuki K Poulose <suzuki.poulose@....com>, 
    Zenghui Yu <yuzenghui@...wei.com>, Shuah Khan <shuah@...nel.org>, 
    "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, 
    "kvmarm@...ts.linux.dev" <kvmarm@...ts.linux.dev>, 
    "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, 
    "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>
Subject: Re: [PATCH v3 0/4] KVM: arm64: selftests: arch_timer_edge_cases
 fixes

Hej Miguel,

On Mon, 9 Jun 2025, Miguel Luis wrote:
>> On 5 Jun 2025, at 10:36, Sebastian Ott <sebott@...hat.com> wrote:
>>
>> Some small fixes for arch_timer_edge_cases that I stumbled upon
>> while debugging failures for this selftest on ampere-one.
>>
>
> I’ve tested this test under three circumstances:
>
> 1) Original (!HAS_EL2 && !HAS_EL2_E2H0)
>
> 2) HAS_EL2 && HAS_EL2_E2H0
>
> 3) HAS_EL2 && !HAS_EL2_E2H0
>
> Tests 1) and 2) returned in approx. the same amount of real time (about 12s) although 3) doesn’t
> seem to return at all.

I've never really looked at nested stuff, I'll try to set smth up and see
if I can reproduce that..

Thanks,
Sebastian