From patchwork Wed Aug 10 10:41:13 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gavin Shan X-Patchwork-Id: 12940425 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 39470C00140 for ; Wed, 10 Aug 2022 10:42:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229534AbiHJKmZ (ORCPT ); Wed, 10 Aug 2022 06:42:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39538 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231443AbiHJKmK (ORCPT ); Wed, 10 Aug 2022 06:42:10 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 6CA496C774 for ; Wed, 10 Aug 2022 03:42:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1660128127; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=zdNPgMQAyUx4falAdQJ3yohJSAww4fRub8jAW+HiU3Y=; b=LaAAzuPYkf2ZADrDXMNBPVjRYC5Ln24KfBkadxc4MkfGrmHMxZEmKD/ZlcUQpIPMtNdO/O B/5pcTmlYLWNEJMGtpoflQLfYiJu9T0jPMkkI37lBf+7V/q7WXe8229vEQR1mDOqB76GMk OEF++gMit+1WTMcMSLzqvFVGAF+mM1I= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-638--LdPjS-RNeKxeCRUylwCPQ-1; Wed, 10 Aug 2022 06:42:03 -0400 X-MC-Unique: -LdPjS-RNeKxeCRUylwCPQ-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.rdu2.redhat.com [10.11.54.2]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id C894910115F1; Wed, 10 Aug 2022 10:42:02 +0000 (UTC) Received: from gshan.redhat.com (vpn2-54-77.bne.redhat.com [10.64.54.77]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 2FEEF4050067; Wed, 10 Aug 2022 10:41:57 +0000 (UTC) From: Gavin Shan To: kvmarm@lists.cs.columbia.edu Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, fweimer@redhat.com, shan.gavin@gmail.com, maz@kernel.org, andrew.jones@linux.dev, mathieu.desnoyers@efficios.com, pbonzini@redhat.com, yihyu@redhat.com, seanjc@google.com, oliver.upton@linux.dev Subject: [PATCH v2 1/2] KVM: selftests: Make rseq compatible with glibc-2.35 Date: Wed, 10 Aug 2022 18:41:13 +0800 Message-Id: <20220810104114.6838-2-gshan@redhat.com> In-Reply-To: <20220810104114.6838-1-gshan@redhat.com> References: <20220810104114.6838-1-gshan@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.11.54.2 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org The rseq information is registered by TLS, starting from glibc-2.35. In this case, the test always fails due to syscall(__NR_rseq). For example, on RHEL9.1 where upstream glibc-2.35 features are enabled on downstream glibc-2.34, the test fails like below. # ./rseq_test ==== Test Assertion Failure ==== rseq_test.c:60: !r pid=112043 tid=112043 errno=22 - Invalid argument 1 0x0000000000401973: main at rseq_test.c:226 2 0x0000ffff84b6c79b: ?? ??:0 3 0x0000ffff84b6c86b: ?? ??:0 4 0x0000000000401b6f: _start at ??:? rseq failed, errno = 22 (Invalid argument) # rpm -aq | grep glibc-2 glibc-2.34-39.el9.aarch64 Fix the issue by using "../rseq/rseq.c" to fetch the rseq information, registred by TLS if it exists. Otherwise, we're going to register our own rseq information as before. Reported-by: Yihuang Yu Suggested-by: Florian Weimer Suggested-by: Mathieu Desnoyers Suggested-by: Paolo Bonzini Signed-off-by: Gavin Shan --- tools/testing/selftests/kvm/Makefile | 5 +++-- tools/testing/selftests/kvm/rseq_test.c | 28 +++++++------------------ 2 files changed, 11 insertions(+), 22 deletions(-) diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile index c7f47429d6cd..89c9a8c52c5f 100644 --- a/tools/testing/selftests/kvm/Makefile +++ b/tools/testing/selftests/kvm/Makefile @@ -197,7 +197,8 @@ endif CFLAGS += -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99 \ -fno-stack-protector -fno-PIE -I$(LINUX_TOOL_INCLUDE) \ -I$(LINUX_TOOL_ARCH_INCLUDE) -I$(LINUX_HDR_PATH) -Iinclude \ - -I$(cpu_id); smp_rmb(); } while (snapshot != atomic_read(&seq_cnt)); @@ -278,7 +266,7 @@ int main(int argc, char *argv[]) kvm_vm_free(vm); - sys_rseq(RSEQ_FLAG_UNREGISTER); + rseq_unregister_current_thread(); return 0; }