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GET /api/1.2/patches/2224567/?format=api
{ "id": 2224567, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2224567/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260417154332.849664-2-jhkim@linux.ibm.com/", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/1.2/projects/14/?format=api", "name": "QEMU Development", "link_name": "qemu-devel", "list_id": "qemu-devel.nongnu.org", "list_email": "qemu-devel@nongnu.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260417154332.849664-2-jhkim@linux.ibm.com>", "list_archive_url": null, "date": "2026-04-17T15:43:08", "name": "[RFC,v1,1/1] hw/s390x/ccw: Disable legacy virtio-pci by default (v11.1+)", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "7df9fc37e0d925a6db6173055e6db602e12ae22a", "submitter": { "id": 91012, "url": "http://patchwork.ozlabs.org/api/1.2/people/91012/?format=api", "name": "Jaehoon Kim", "email": "jhkim@linux.ibm.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260417154332.849664-2-jhkim@linux.ibm.com/mbox/", "series": [ { "id": 500368, "url": "http://patchwork.ozlabs.org/api/1.2/series/500368/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=500368", "date": "2026-04-17T15:43:08", "name": "hw/s390x/ccw: Disable legacy mode", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/500368/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2224567/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2224567/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256\n header.s=pp1 header.b=jWy4Ph/+;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc\n :content-transfer-encoding:date:from:in-reply-to:message-id\n :mime-version:references:subject:to; s=pp1; bh=BxybZn66XCrc8P0j4\n DwuJFQxCmW6tFhy0lt83D36CrQ=; b=jWy4Ph/+XD2iXFQ0FgJnoOqIhtFW5ywdH\n X98T5COynr0J61oOnSZESgyJfJ+giUYJ5rVoBwkoV9YpwRJIECbN0Jk56/3JhWPm\n 2xfRJFmE+5M37ioGBtnB4dDefHRGS1igLIr6+j4Patdc/5viqky35ZC7mUny8Bia\n 16zxzXGhetAem4I2Rot/VdtvaP8I6J6QQA7GxtLcaiN9StVbFPAGh8tvzCSxGufK\n zZd+3kfRzJbSn7k6VZ60G9RddGM8XLuXXadwLkFijo2ROqrBxpR/GhyOAvenXr1E\n SXPhtHwuHpJF1LwsQAeM4hJGAe6ytAPjeMwB/mtvINnTFDDKWlrwA==", "From": "Jaehoon Kim <jhkim@linux.ibm.com>", "To": "qemu-devel@nongnu.org, qemu-s390x@nongnu.org", "Cc": "richard.henderson@linaro.org, iii@linux.ibm.com, david@kernel.org,\n pasic@linux.ibm.com, borntraeger@linux.ibm.com, farman@linux.ibm.com,\n mjrosato@linux.ibm.com, cohuck@redhat.com,\n Jaehoon Kim <jhkim@linux.ibm.com>", "Subject": "[PATCH RFC v1 1/1] hw/s390x/ccw: Disable legacy virtio-pci by default\n (v11.1+)", "Date": "Fri, 17 Apr 2026 10:43:08 -0500", "Message-ID": "<20260417154332.849664-2-jhkim@linux.ibm.com>", "X-Mailer": "git-send-email 2.43.0", "In-Reply-To": "<20260417154332.849664-1-jhkim@linux.ibm.com>", "References": "<20260417154332.849664-1-jhkim@linux.ibm.com>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-TM-AS-GCONF": "00", "X-Proofpoint-Spam-Details-Enc": "AW1haW4tMjYwNDE3MDE1NCBTYWx0ZWRfX6Lc06qA/F7Bh\n A1oo3fj07zfnAbeWscr9/M6C3CGllPNTsT6YIt+lE1jAbXNxT7BBuhVgtx3p7zg4HrHHWi3YHAw\n 290Cu072SoK1rcoqmKtHlxEPRP3rvwja/Wm3tQ1iZf+hee8MzJCkHSriTEcOKji4S3A73160yzL\n yjWvsVpVl+ayHYy3l0BYuzPWV9KI/Vu3T+FCrq0MDxmp412w6uX6V5JdteYuD8Um+Lp3rQx5e+R\n Iy4rXdkPe4W1Pt8KeoQ+GyksQizEfWLxshapKfCMeibarTrO2i84nHQo0+oLSTnllHsQr2ZXAsd\n 0WsQmujLbXYwtGzF+d8j/aZiSrbY0U2EXJ/sZ4QHjj7R28kEhUqVxHw4zwl1kG5Mkg2slcFb8SM\n F+2rpdfuoGKjIaHBikkdi328za/MrohcRArWaURE2i+x7BMfKmRvGGMseFkFx1cfFc21HWy1kdo\n nUb2QAaUCjF7Ii7BlXw==", "X-Proofpoint-ORIG-GUID": "zzRtW-IuBlASfYvfDchdnBokwnsWpa6H", "X-Proofpoint-GUID": "zzRtW-IuBlASfYvfDchdnBokwnsWpa6H", "X-Authority-Analysis": "v=2.4 cv=fYidDUQF c=1 sm=1 tr=0 ts=69e25538 cx=c_pps\n a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17\n a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22\n a=U7nrCbtTmkRpXpFmAIza:22 a=VnNF1IyMAAAA:8 a=my5jLqFW4fTaoRaGlZgA:9", "X-Proofpoint-Virus-Version": "vendor=baseguard\n engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49\n definitions=2026-04-17_01,2026-04-17_04,2025-10-01_01", "X-Proofpoint-Spam-Details": "rule=outbound_notspam policy=outbound score=0\n adultscore=0 impostorscore=0 clxscore=1015 malwarescore=0 phishscore=0\n bulkscore=0 priorityscore=1501 spamscore=0 suspectscore=0 lowpriorityscore=0\n classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0\n reason=mlx scancount=1 engine=8.22.0-2604070000 definitions=main-2604170154", "Received-SPF": "pass client-ip=148.163.156.1; envelope-from=jhkim@linux.ibm.com;\n helo=mx0a-001b2d01.pphosted.com", "X-Spam_score_int": "-26", "X-Spam_score": "-2.7", "X-Spam_bar": "--", "X-Spam_report": "(-2.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7,\n RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001,\n RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001,\n 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": "2.1.29", "Precedence": "list", "List-Id": "qemu development <qemu-devel.nongnu.org>", "List-Unsubscribe": "<https://lists.nongnu.org/mailman/options/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>", "List-Archive": "<https://lists.nongnu.org/archive/html/qemu-devel>", "List-Post": "<mailto:qemu-devel@nongnu.org>", "List-Help": "<mailto:qemu-devel-request@nongnu.org?subject=help>", "List-Subscribe": "<https://lists.nongnu.org/mailman/listinfo/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=subscribe>", "Errors-To": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org", "Sender": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org" }, "content": "On the s390 Linux kernel, IO_SPACE_LIMIT has been 0 since the initial\nzPCI implementation (commit cd24834130ac \"s390/pci: base support\"),\nmaking I/O BARs unusable.\n\nHowever, when virtio-pci devices operate in transitional mode, QEMU\nunconditionally exposes the legacy interface via BAR0. This results in\nfirmware warnings during PCI enumeration, such as:\n\n pci 0005:00:00.0: [Firmware Bug]: BAR 0: invalid; can't size\n\neven though BAR0 is never usable on the s390 kernel.\n\nClose this gap by disabling legacy virtio-pci support starting from\nmachine version 11.1. This effectively makes virtio-pci devices\nnon-transitional and prevents the creation of the unusable legacy I/O\nBAR.\n\nThis introduces s390x-specific global compatibility properties that\nset disable-legacy=on as the default for virtio-pci devices. Machine\nversions v11.0 and earlier set disable-legacy=off to maintain their\noriginal default behavior (legacy support enabled), ensuring VMs\ncreated with those versions continue to work identically.\n\nUsers can override the default on the command line if needed:\n - On v11.1+: -global virtio-pci.disable-legacy=off (to enable legacy)\n - On v11.0-: -global virtio-pci.disable-legacy=on (to disable legacy)\n\nSigned-off-by: Jaehoon Kim <jhkim@linux.ibm.com>\n---\n hw/s390x/s390-virtio-ccw.c | 23 +++++++++++++++++++++++\n 1 file changed, 23 insertions(+)", "diff": "diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c\nindex cc768daeb0..6fbea1e289 100644\n--- a/hw/s390x/s390-virtio-ccw.c\n+++ b/hw/s390x/s390-virtio-ccw.c\n@@ -788,6 +788,18 @@ static void machine_set_loadparm(Object *obj, Visitor *v,\n g_free(val);\n }\n \n+/*\n+ * S390x-specific global compatibility properties.\n+ *\n+ * Set disable-legacy=on as the default for virtio-pci devices starting\n+ * from v11.1. Machine versions v11.0 and earlier set disable-legacy=off\n+ * to maintain their original default behavior (legacy support enabled).\n+ */\n+static GlobalProperty hw_compat_s390x[] = {\n+ { TYPE_VIRTIO_PCI, \"disable-legacy\", \"on\", .optional = true},\n+};\n+static const size_t hw_compat_s390x_len = G_N_ELEMENTS(hw_compat_s390x);\n+\n static void ccw_machine_class_init(ObjectClass *oc, const void *data)\n {\n MachineClass *mc = MACHINE_CLASS(oc);\n@@ -878,6 +890,9 @@ static const TypeInfo ccw_machine_info = {\n const void *data) \\\n { \\\n MachineClass *mc = MACHINE_CLASS(oc); \\\n+ /* Apply global s390x-wide default properties */ \\\n+ compat_props_add(mc->compat_props, hw_compat_s390x, \\\n+ hw_compat_s390x_len); \\\n MACHINE_VER_SYM(class_options, ccw, __VA_ARGS__)(mc); \\\n mc->desc = \"Virtual s390x machine (version \" MACHINE_VER_STR(__VA_ARGS__) \")\"; \\\n mc->init = MACHINE_VER_SYM(mach_init, ccw, __VA_ARGS__); \\\n@@ -923,7 +938,15 @@ static void ccw_machine_11_0_instance_options(MachineState *machine)\n \n static void ccw_machine_11_0_class_options(MachineClass *mc)\n {\n+ /*\n+ * Preserve v11.0 and older version behavior:\n+ * keep legacy virtio-pci enabled.\n+ */\n+ static GlobalProperty compat[] = {\n+ { TYPE_VIRTIO_PCI, \"disable-legacy\", \"off\" },\n+ };\n ccw_machine_11_1_class_options(mc);\n+ compat_props_add(mc->compat_props, compat, G_N_ELEMENTS(compat));\n compat_props_add(mc->compat_props, hw_compat_11_0, hw_compat_11_0_len);\n }\n DEFINE_CCW_MACHINE(11, 0);\n", "prefixes": [ "RFC", "v1", "1/1" ] }