From: Gavin Shan <gshan@redhat.com>
To: Florian Weimer <fweimer@redhat.com>
Cc: shan.gavin@gmail.com, kvm@vger.kernel.org, maz@kernel.org,
linux-kernel@vger.kernel.org, andrew.jones@linux.dev,
mathieu.desnoyers@efficios.com, yihyu@redhat.com,
linux-kselftest@vger.kernel.org, pbonzini@redhat.com,
kvmarm@lists.cs.columbia.edu
Subject: Re: [PATCH 1/2] KVM: selftests: Make rseq compatible with glibc-2.35
Date: Tue, 9 Aug 2022 19:27:44 +1000 [thread overview]
Message-ID: <616d4de6-81f6-9d14-4e57-4a79fec45690@redhat.com> (raw)
In-Reply-To: <87o7wtnay6.fsf@oldenburg.str.redhat.com>
Hi Florian,
On 8/9/22 5:16 PM, Florian Weimer wrote:
>>> __builtin_thread_pointer doesn't work on all architectures/GCC
>>> versions.
>>> Is this a problem for selftests?
>>>
>>
>> It's a problem as the test case is running on all architectures. I think I
>> need introduce our own __builtin_thread_pointer() for where it's not
>> supported: (1) PowerPC (2) x86 without GCC 11
>>
>> Please let me know if I still have missed cases where
>> __buitin_thread_pointer() isn't supported?
>
> As far as I know, these are the two outliers that also have rseq
> support. The list is a bit longer if we also consider non-rseq
> architectures (csky, hppa, ia64, m68k, microblaze, sparc, don't know
> about the Linux architectures without glibc support).
>
For kvm/selftests, there are 3 architectures involved actually. So we
just need consider 4 cases: aarch64, x86, s390 and other. For other
case, we just use __builtin_thread_pointer() to maintain code's
integrity, but it's not called at all.
I think kvm/selftest is always relying on glibc if I'm correct.
Thanks,
Gavin
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next prev parent reply other threads:[~2022-08-09 7:27 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-09 6:06 [PATCH 0/2] kvm/selftests: Two rseq_test fixes Gavin Shan
2022-08-09 6:06 ` [PATCH 1/2] KVM: selftests: Make rseq compatible with glibc-2.35 Gavin Shan
2022-08-09 6:33 ` Florian Weimer
2022-08-09 8:45 ` Gavin Shan
2022-08-09 7:16 ` Florian Weimer
2022-08-09 9:27 ` Gavin Shan [this message]
2022-08-09 12:21 ` Mathieu Desnoyers
2022-08-09 13:44 ` Mathieu Desnoyers
2022-08-09 21:38 ` Sean Christopherson
2022-08-10 0:37 ` Gavin Shan
2022-08-10 12:29 ` Mathieu Desnoyers
2022-08-10 12:35 ` Paolo Bonzini
2022-08-10 12:13 ` Mathieu Desnoyers
2022-08-10 23:52 ` Gavin Shan
2022-08-10 9:14 ` Paolo Bonzini
2022-08-10 9:59 ` Gavin Shan
2022-08-10 12:17 ` Mathieu Desnoyers
2022-08-10 12:19 ` Paolo Bonzini
2022-08-10 23:34 ` Gavin Shan
2022-08-09 6:06 ` [PATCH 2/2] KVM: selftests: Use getcpu() instead of sched_getcpu() in rseq_test Gavin Shan
2022-08-09 6:35 ` Florian Weimer
2022-08-09 7:17 ` Florian Weimer
2022-08-09 8:46 ` Gavin Shan
2022-08-09 20:53 ` Sean Christopherson
2022-08-10 0:45 ` Gavin Shan
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