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X-Forefront-PRVS: 0310C78181 X-Forefront-Antispam-Report: SFV:NSPM; SFS:(10019020)(4636009)(396003)(366004)(136003)(376002)(39860400002)(346002)(199004)(189003)(16526019)(6666004)(1076003)(5660300002)(86362001)(316002)(186003)(786003)(66556008)(54906003)(6916009)(66476007)(6486002)(66946007)(8936002)(478600001)(4326008)(7696005)(52116002)(36756003)(75432002)(2616005)(2906002)(956004)(8676002)(26005)(81166006)(81156014); DIR:OUT; SFP:1102; SCL:1; SRVR:SN6PR03MB4336; H:SN6PR03MB3871.namprd03.prod.outlook.com; FPR:; SPF:None; LANG:en; PTR:InfoNoRecords; A:1; MX:1; Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: None (protection.outlook.com: bu.edu does not designate permitted sender hosts) X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: xuWn+4fz7KJML0kDpUa3ouvfTEEpV32UqHBzMCdrM37BMSpoXR/MeXWBpXAaLjmfcPIPlqDsiDMjsWzh8VXTJRi6VLHeHv3NcKcZgmJtbPWJc9Opc/7OjO4bWfqXOPMGu5qwfiF1jFI8F9UIc0B1KRJi+TMeA5x0+eeE4rh48Kk8toYa6g3CHsgHVqBhdpjKYf9zzFcy6q+0dEhKJNWS38r68pNXUA3qmHe/unj/gXjU0oKyIvoV1Ej7aHnxssZALXYrx+qbV9HXng+0JvfkfsF2UWq66ueND7jly6bdvMOKxZYRl4+ZIhYlLx915BbYld3qt8D0G4CDcU+vEx1sxyDWbXTb5NqqC+1UovhZZZ9WW2jypW5S6B2fQUrue0dJJdLC8HGeyCXElOWtBEHipJwLKWLQzReKk6IzXvUok4RkxRm6LbEqhs7Nhvv8OFKn X-MS-Exchange-AntiSpam-MessageData: F0V16MIrff4w54i4cQ4NPASk2/CtXZvCnfAfv/F1cT/rdIo1jB+qd8UIvgWre4B6nNNAhRxfB8ACBIyTy5QKA9wTKZKhlTL6/q1YwQJ/TgHLTcpDoxLtUTh8GYfkV6ZbPedW9UGOwhIkbwUrLApifQ== X-OriginatorOrg: bu.edu X-MS-Exchange-CrossTenant-Network-Message-Id: e0173771-a8c6-4832-50db-08d7af31f203 X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Feb 2020 20:35:34.6305 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: d57d32cc-c121-488f-b07b-dfe705680c71 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: Qn/E0UyFvjrD7WZA/0/M7vRx96d6yhAsMvE+WuzJvWtQUqro17dAvvzJ4FDdAJHb X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN6PR03MB4336 X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. 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+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Computed bodyhash is different from the expected one) Content-Type: text/plain; charset="utf-8" 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 case + * 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