From nobody Sat Apr 5 15:38:47 2025 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1737990537116471.1765498784263; Mon, 27 Jan 2025 07:08:57 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1tcPxC-0008Vn-Vq; Mon, 27 Jan 2025 09:19:07 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1tcPwX-0008LO-9u; Mon, 27 Jan 2025 09:18:34 -0500 Received: from isrv.corpit.ru ([86.62.121.231]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1tcPwU-0002LE-3E; Mon, 27 Jan 2025 09:18:23 -0500 Received: from localhost.tls.msk.ru (mjt.wg.tls.msk.ru [192.168.177.130]) by isrv.corpit.ru (Postfix) with ESMTP id 3B01CE0E2C; Mon, 27 Jan 2025 17:17:39 +0300 (MSK) Received: by localhost.tls.msk.ru (Postfix, from userid 1000) id 7453051D78; Mon, 27 Jan 2025 17:18:03 +0300 (MSK) From: Michael Tokarev To: qemu-devel@nongnu.org Cc: qemu-stable@nongnu.org, David Hildenbrand , "Michael S . Tsirkin" , Eric Farman , Thomas Huth , Janosch Frank , Michael Tokarev Subject: [Stable-9.2.1 11/41] s390x/s390-virtio-ccw: don't crash on weird RAM sizes Date: Mon, 27 Jan 2025 17:17:25 +0300 Message-Id: <20250127141803.3514882-11-mjt@tls.msk.ru> X-Mailer: git-send-email 2.39.5 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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: pass client-ip=86.62.121.231; envelope-from=mjt@tls.msk.ru; helo=isrv.corpit.ru X-Spam_score_int: -68 X-Spam_score: -6.9 X-Spam_bar: ------ X-Spam_report: (-6.9 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_HI=-5, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZM-MESSAGEID: 1737990538646019000 Content-Type: text/plain; charset="utf-8" From: David Hildenbrand KVM is not happy when starting a VM with weird RAM sizes: # qemu-system-s390x --enable-kvm --nographic -m 1234K qemu-system-s390x: kvm_set_user_memory_region: KVM_SET_USER_MEMORY_REGION failed, slot=3D0, start=3D0x0, size=3D0x244000: Invalid argument kvm_set_phys_mem: error registering slot: Invalid argument Aborted (core dumped) Let's handle that in a better way by rejecting such weird RAM sizes right from the start: # qemu-system-s390x --enable-kvm --nographic -m 1234K qemu-system-s390x: ram size must be multiples of 1 MiB Message-ID: <20241219144115.2820241-2-david@redhat.com> Acked-by: Michael S. Tsirkin Reviewed-by: Eric Farman Reviewed-by: Thomas Huth Acked-by: Janosch Frank Signed-off-by: David Hildenbrand (cherry picked from commit 14e568ab4836347481af2e334009c385f456a734) Signed-off-by: Michael Tokarev diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c index fe03f716f3..53c62fb77c 100644 --- a/hw/s390x/s390-virtio-ccw.c +++ b/hw/s390x/s390-virtio-ccw.c @@ -180,6 +180,17 @@ static void s390_memory_init(MemoryRegion *ram) { MemoryRegion *sysmem =3D get_system_memory(); =20 + if (!QEMU_IS_ALIGNED(memory_region_size(ram), 1 * MiB)) { + /* + * SCLP cannot possibly expose smaller granularity right now and K= VM + * cannot handle smaller granularity. As we don't support NUMA, the + * region size directly corresponds to machine->ram_size, and the = region + * is a single RAM memory region. + */ + error_report("ram size must be multiples of 1 MiB"); + exit(EXIT_FAILURE); + } + /* allocate RAM for core */ memory_region_add_subregion(sysmem, 0, ram); =20 --=20 2.39.5