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Mon, 12 Feb 2024 20:50:28 +0000 (GMT) From: Ilya Leoshkevich To: =?utf-8?q?Alex_Benn=C3=A9e?= , Laurent Vivier , Richard Henderson Cc: qemu-devel@nongnu.org, Michael Tokarev , Ilya Leoshkevich Subject: [PATCH v2 1/2] linux-user: Map low priority rt signals Date: Mon, 12 Feb 2024 21:45:42 +0100 Message-ID: <20240212205022.242968-2-iii@linux.ibm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240212205022.242968-1-iii@linux.ibm.com> References: <20240212205022.242968-1-iii@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: 3vipn1ZmSg8w-Lf-8TyqpMK9TiaLISW- X-Proofpoint-GUID: 3vipn1ZmSg8w-Lf-8TyqpMK9TiaLISW- X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.1011,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-02-12_16,2024-02-12_03,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 spamscore=0 mlxlogscore=999 priorityscore=1501 malwarescore=0 lowpriorityscore=0 impostorscore=0 suspectscore=0 mlxscore=0 adultscore=0 phishscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2402120161 Received-SPF: pass client-ip=148.163.158.5; envelope-from=iii@linux.ibm.com; helo=mx0b-001b2d01.pphosted.com X-Spam_score_int: -19 X-Spam_score: -2.0 X-Spam_bar: -- X-Spam_report: (-2.0 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Some applications want to use low priority realtime signals (e.g., SIGRTMAX). Currently QEMU cannot map all target realtime signals to host signals, and chooses to sacrifice the end of the target realtime signal range. Change this to the middle of that range, hoping that fewer applications will need it. Signed-off-by: Ilya Leoshkevich --- linux-user/signal.c | 18 +++++++++++++----- 1 file changed, 13 insertions(+), 5 deletions(-) diff --git a/linux-user/signal.c b/linux-user/signal.c index d3e62ab030f..a81533b563a 100644 --- a/linux-user/signal.c +++ b/linux-user/signal.c @@ -511,13 +511,14 @@ static int core_dump_signal(int sig) static void signal_table_init(void) { - int hsig, tsig, count; + int hsig, hsig_count, tsig, tsig_count, tsig_hole, tsig_hole_size, count; /* - * Signals are supported starting from TARGET_SIGRTMIN and going up - * until we run out of host realtime signals. Glibc uses the lower 2 - * RT signals and (hopefully) nobody uses the upper ones. - * This is why SIGRTMIN (34) is generally greater than __SIGRTMIN (32). + * Signals are supported starting from TARGET_SIGRTMIN and up to + * TARGET_SIGRTMAX, potentially with a hole in the middle of this + * range, which, hopefully, nobody uses. Glibc uses the lower 2 RT + * signals; this is why SIGRTMIN (34) is generally greater than + * __SIGRTMIN (32). * To fix this properly we would need to do manual signal delivery * multiplexed over a single host signal. * Attempts for configure "missing" signals via sigaction will be @@ -536,9 +537,16 @@ static void signal_table_init(void) host_to_target_signal_table[SIGABRT] = 0; host_to_target_signal_table[hsig++] = TARGET_SIGABRT; + hsig_count = SIGRTMAX - hsig + 1; + tsig_count = TARGET_NSIG - TARGET_SIGRTMIN + 1; + tsig_hole_size = tsig_count - MIN(hsig_count, tsig_count); + tsig_hole = TARGET_SIGRTMIN + (tsig_count - tsig_hole_size) / 2; for (tsig = TARGET_SIGRTMIN; hsig <= SIGRTMAX && tsig <= TARGET_NSIG; hsig++, tsig++) { + if (tsig == tsig_hole) { + tsig += tsig_hole_size; + } host_to_target_signal_table[hsig] = tsig; } From patchwork Mon Feb 12 20:45:43 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ilya Leoshkevich X-Patchwork-Id: 13553962 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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 82346C4829E for ; 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Mon, 12 Feb 2024 20:50:34 +0000 Received: from smtpav05.fra02v.mail.ibm.com (smtpav05.fra02v.mail.ibm.com [10.20.54.104]) by smtprelay01.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 41CKoU1A20054626 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 12 Feb 2024 20:50:32 GMT Received: from smtpav05.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 507C32004F; Mon, 12 Feb 2024 20:50:30 +0000 (GMT) Received: from smtpav05.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E40E720043; Mon, 12 Feb 2024 20:50:29 +0000 (GMT) Received: from heavy.ibm.com (unknown [9.179.4.126]) by smtpav05.fra02v.mail.ibm.com (Postfix) with ESMTP; Mon, 12 Feb 2024 20:50:29 +0000 (GMT) From: Ilya Leoshkevich To: =?utf-8?q?Alex_Benn=C3=A9e?= , Laurent Vivier , Richard Henderson Cc: qemu-devel@nongnu.org, Michael Tokarev , Ilya Leoshkevich Subject: [PATCH v2 2/2] tests/tcg: Add SIGRTMIN/SIGRTMAX test Date: Mon, 12 Feb 2024 21:45:43 +0100 Message-ID: <20240212205022.242968-3-iii@linux.ibm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240212205022.242968-1-iii@linux.ibm.com> References: <20240212205022.242968-1-iii@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: y8VjxJ4XrRLxheZ_r0w0idaz2Ch8uSq7 X-Proofpoint-ORIG-GUID: y8VjxJ4XrRLxheZ_r0w0idaz2Ch8uSq7 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.1011,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-02-12_16,2024-02-12_03,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 impostorscore=0 malwarescore=0 priorityscore=1501 bulkscore=0 adultscore=0 clxscore=1015 lowpriorityscore=0 phishscore=0 suspectscore=0 spamscore=0 mlxlogscore=735 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2402120161 Received-SPF: pass client-ip=148.163.158.5; envelope-from=iii@linux.ibm.com; helo=mx0b-001b2d01.pphosted.com X-Spam_score_int: -19 X-Spam_score: -2.0 X-Spam_bar: -- X-Spam_report: (-2.0 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Test the lowest and the highest real-time signals. Signed-off-by: Ilya Leoshkevich --- tests/tcg/multiarch/linux/linux-sigrtminmax.c | 41 +++++++++++++++++++ 1 file changed, 41 insertions(+) create mode 100644 tests/tcg/multiarch/linux/linux-sigrtminmax.c diff --git a/tests/tcg/multiarch/linux/linux-sigrtminmax.c b/tests/tcg/multiarch/linux/linux-sigrtminmax.c new file mode 100644 index 00000000000..773383a3fef --- /dev/null +++ b/tests/tcg/multiarch/linux/linux-sigrtminmax.c @@ -0,0 +1,41 @@ +/* + * Test the lowest and the highest real-time signals. + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ +#include +#include +#include +#include +#include +#include + +static bool seen_sigrtmin, seen_sigrtmax; + +static void handle_signal(int sig) +{ + if (sig == SIGRTMIN) { + seen_sigrtmin = true; + } else if (sig == SIGRTMAX) { + seen_sigrtmax = true; + } else { + _exit(1); + } +} + +int main(void) +{ + struct sigaction act; + + memset(&act, 0, sizeof(act)); + act.sa_handler = handle_signal; + assert(sigaction(SIGRTMIN, &act, NULL) == 0); + assert(sigaction(SIGRTMAX, &act, NULL) == 0); + + assert(kill(getpid(), SIGRTMIN) == 0); + assert(seen_sigrtmin); + assert(kill(getpid(), SIGRTMAX) == 0); + assert(seen_sigrtmax); + + return EXIT_SUCCESS; +}