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Tue, 11 Feb 2020 20:35:35 +0000 From: Alexander Bulekov To: qemu-devel@nongnu.org Subject: [PATCH v9 14/23] exec: keep ram block across fork when using qtest Date: Tue, 11 Feb 2020 15:35:01 -0500 Message-ID: <20200211203510.3534-15-alxndr@bu.edu> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200211203510.3534-1-alxndr@bu.edu> References: <20200211203510.3534-1-alxndr@bu.edu> Content-Transfer-Encoding: quoted-printable Content-Type: text/plain X-ClientProxiedBy: BL0PR02CA0124.namprd02.prod.outlook.com (2603:10b6:208:35::29) To SN6PR03MB3871.namprd03.prod.outlook.com (2603:10b6:805:6d::32) MIME-Version: 1.0 Received: from mozz.bu.edu (128.197.127.33) by BL0PR02CA0124.namprd02.prod.outlook.com (2603:10b6:208:35::29) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2707.23 via Frontend Transport; Tue, 11 Feb 2020 20:35:34 +0000 X-Mailer: git-send-email 2.25.0 X-Originating-IP: [128.197.127.33] X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: e0173771-a8c6-4832-50db-08d7af31f203 X-MS-TrafficTypeDiagnostic: SN6PR03MB4336: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:4941; 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That's all we know. X-Received-From: 40.107.69.106 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: darren.kenny@oracle.com, Alexander Bulekov , bsd@redhat.com, stefanha@redhat.com, pbonzini@redhat.com, Richard Henderson Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Ram blocks were marked MADV_DONTFORK breaking fuzzing-tests which execute each test-input in a forked process. Signed-off-by: Alexander Bulekov Reviewed-by: Stefan Hajnoczi Reviewed-by: Darren Kenny --- exec.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/exec.c b/exec.c index 67e520d18e..43f6659d12 100644 --- a/exec.c +++ b/exec.c @@ -35,6 +35,7 @@ #include "sysemu/kvm.h" #include "sysemu/sysemu.h" #include "sysemu/tcg.h" +#include "sysemu/qtest.h" #include "qemu/timer.h" #include "qemu/config-file.h" #include "qemu/error-report.h" @@ -2306,8 +2307,15 @@ static void ram_block_add(RAMBlock *new_block, Error= **errp, bool shared) if (new_block->host) { qemu_ram_setup_dump(new_block->host, new_block->max_length); qemu_madvise(new_block->host, new_block->max_length, QEMU_MADV_HUG= EPAGE); - /* MADV_DONTFORK is also needed by KVM in absence of synchronous M= MU */ - qemu_madvise(new_block->host, new_block->max_length, QEMU_MADV_DON= TFORK); + /* + * MADV_DONTFORK is also needed by KVM in absence of synchronous M= MU + * Configure it unless the machine is a qtest server, in which cas= e + * KVM is not used and it may be forked (eg for fuzzing purposes). + */ + if (!qtest_enabled()) { + qemu_madvise(new_block->host, new_block->max_length, + QEMU_MADV_DONTFORK); + } ram_block_notify_add(new_block->host, new_block->max_length); } } --=20 2.25.0