From mboxrd@z Thu Jan 1 00:00:00 1970 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3579CC433F5 for ; Mon, 4 Oct 2021 12:06:39 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id BA0E060F9B for ; Mon, 4 Oct 2021 12:06:38 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org BA0E060F9B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=nongnu.org Received: from localhost ([::1]:56990 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mXMjt-00060p-WB for qemu-devel@archiver.kernel.org; Mon, 04 Oct 2021 08:06:38 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:44100) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mXMgE-0001hg-37 for qemu-devel@nongnu.org; Mon, 04 Oct 2021 08:02:50 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:47976) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mXMgA-0006BW-NL for qemu-devel@nongnu.org; Mon, 04 Oct 2021 08:02:49 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1633348966; 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=NMOA9kQbOGwFqcPMc+ilA6kpME97Hs3N/G+0b3k1Sx0=; b=B3a4p7EbMY9MoGCqVYn6/8IMjbgiSnpyIOc6aqm8hoWP1utnljUrKF5VgO96LQWx2joUDl w4+U2Rz21MuhTNfAPtp5fThjVQtISqZjFm2H6PML8UVj1NL8NUSS7FXtNtDzKhm88wzLd9 eUzBDZAuTuC3TLgEYV2i3gWoYwEzme0= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-46-cDSeACuYPTiHbdW7CNNb4A-1; Mon, 04 Oct 2021 08:02:42 -0400 X-MC-Unique: cDSeACuYPTiHbdW7CNNb4A-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 0D9AD802947; Mon, 4 Oct 2021 12:02:42 +0000 (UTC) Received: from t480s.redhat.com (unknown [10.39.194.159]) by smtp.corp.redhat.com (Postfix) with ESMTP id EE27F19C59; Mon, 4 Oct 2021 12:02:38 +0000 (UTC) From: David Hildenbrand To: qemu-devel@nongnu.org Subject: [PATCH v4 1/7] util/oslib-posix: Let touch_all_pages() return an error Date: Mon, 4 Oct 2021 14:02:02 +0200 Message-Id: <20211004120208.7409-2-david@redhat.com> In-Reply-To: <20211004120208.7409-1-david@redhat.com> References: <20211004120208.7409-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=david@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=170.10.133.124; envelope-from=david@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -28 X-Spam_score: -2.9 X-Spam_bar: -- X-Spam_report: (-2.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.066, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Pankaj Gupta , =?UTF-8?q?Daniel=20P=20=2E=20Berrang=C3=A9?= , Eduardo Habkost , "Michael S. Tsirkin" , David Hildenbrand , "Dr . David Alan Gilbert" , Igor Mammedov , Paolo Bonzini Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Let's prepare touch_all_pages() for returning differing errors. Return an error from the thread and report the last processed error. Translate SIGBUS to -EFAULT, as a SIGBUS can mean all different kind of things (memory error, read error, out of memory). When allocating memory fails via the current SIGBUS-based mechanism, we'll get: os_mem_prealloc: preallocating memory failed: Bad address Reviewed-by: Daniel P. Berrangé Signed-off-by: David Hildenbrand --- util/oslib-posix.c | 28 ++++++++++++++++------------ 1 file changed, 16 insertions(+), 12 deletions(-) diff --git a/util/oslib-posix.c b/util/oslib-posix.c index e8bdb02e1d..b146beef78 100644 --- a/util/oslib-posix.c +++ b/util/oslib-posix.c @@ -84,7 +84,6 @@ typedef struct MemsetThread MemsetThread; static MemsetThread *memset_thread; static int memset_num_threads; -static bool memset_thread_failed; static QemuMutex page_mutex; static QemuCond page_cond; @@ -452,6 +451,7 @@ static void *do_touch_pages(void *arg) { MemsetThread *memset_args = (MemsetThread *)arg; sigset_t set, oldset; + int ret = 0; /* * On Linux, the page faults from the loop below can cause mmap_sem @@ -470,7 +470,7 @@ static void *do_touch_pages(void *arg) pthread_sigmask(SIG_UNBLOCK, &set, &oldset); if (sigsetjmp(memset_args->env, 1)) { - memset_thread_failed = true; + ret = -EFAULT; } else { char *addr = memset_args->addr; size_t numpages = memset_args->numpages; @@ -494,7 +494,7 @@ static void *do_touch_pages(void *arg) } } pthread_sigmask(SIG_SETMASK, &oldset, NULL); - return NULL; + return (void *)(uintptr_t)ret; } static inline int get_memset_num_threads(int smp_cpus) @@ -509,13 +509,13 @@ static inline int get_memset_num_threads(int smp_cpus) return ret; } -static bool touch_all_pages(char *area, size_t hpagesize, size_t numpages, - int smp_cpus) +static int touch_all_pages(char *area, size_t hpagesize, size_t numpages, + int smp_cpus) { static gsize initialized = 0; size_t numpages_per_thread, leftover; + int ret = 0, i = 0; char *addr = area; - int i = 0; if (g_once_init_enter(&initialized)) { qemu_mutex_init(&page_mutex); @@ -523,7 +523,6 @@ static bool touch_all_pages(char *area, size_t hpagesize, size_t numpages, g_once_init_leave(&initialized, 1); } - memset_thread_failed = false; threads_created_flag = false; memset_num_threads = get_memset_num_threads(smp_cpus); memset_thread = g_new0(MemsetThread, memset_num_threads); @@ -545,12 +544,16 @@ static bool touch_all_pages(char *area, size_t hpagesize, size_t numpages, qemu_mutex_unlock(&page_mutex); for (i = 0; i < memset_num_threads; i++) { - qemu_thread_join(&memset_thread[i].pgthread); + int tmp = (uintptr_t)qemu_thread_join(&memset_thread[i].pgthread); + + if (tmp) { + ret = tmp; + } } g_free(memset_thread); memset_thread = NULL; - return memset_thread_failed; + return ret; } void os_mem_prealloc(int fd, char *area, size_t memory, int smp_cpus, @@ -573,9 +576,10 @@ void os_mem_prealloc(int fd, char *area, size_t memory, int smp_cpus, } /* touch pages simultaneously */ - if (touch_all_pages(area, hpagesize, numpages, smp_cpus)) { - error_setg(errp, "os_mem_prealloc: Insufficient free host memory " - "pages available to allocate guest RAM"); + ret = touch_all_pages(area, hpagesize, numpages, smp_cpus); + if (ret) { + error_setg_errno(errp, -ret, + "os_mem_prealloc: preallocating memory failed"); } ret = sigaction(SIGBUS, &oldact, NULL); -- 2.31.1