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GET /api/patches/2219482/?format=api
{ "id": 2219482, "url": "http://patchwork.ozlabs.org/api/patches/2219482/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260403053748.78831-5-mohamed@unpredictable.fr/", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/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": "<20260403053748.78831-5-mohamed@unpredictable.fr>", "list_archive_url": null, "date": "2026-04-03T05:37:45", "name": "[v4,4/7] whpx: i386: disable TbFlushHypercalls for emulated LAPIC", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "c8bc98883e288377ddb601331c7229a335473143", "submitter": { "id": 91318, "url": "http://patchwork.ozlabs.org/api/people/91318/?format=api", "name": "Mohamed Mediouni", "email": "mohamed@unpredictable.fr" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260403053748.78831-5-mohamed@unpredictable.fr/mbox/", "series": [ { "id": 498589, "url": "http://patchwork.ozlabs.org/api/series/498589/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=498589", "date": "2026-04-03T05:37:41", "name": "whpx: i386: x2apic emulation for kernel-irqchip=off, feature probing", "version": 4, "mbox": "http://patchwork.ozlabs.org/series/498589/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2219482/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2219482/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=unpredictable.fr header.i=@unpredictable.fr\n header.a=rsa-sha256 header.s=sig1 header.b=c9DD0jM9;\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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Fri, 03 Apr 2026 01:38:01 -0400", "from outbound.qs.icloud.com (unknown [127.0.0.2])\n by p00-icloudmta-asmtp-us-east-2d-100-percent-4 (Postfix) with ESMTPS id\n F1F9E180015D; Fri, 03 Apr 2026 05:37:57 +0000 (UTC)", "from localhost.localdomain (unknown [17.57.155.37])\n by p00-icloudmta-asmtp-us-east-2d-100-percent-4 (Postfix) with ESMTPSA id\n 471F11800151; Fri, 03 Apr 2026 05:37:56 +0000 (UTC)" ], "Dkim-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=unpredictable.fr;\n s=sig1; t=1775194680; x=1777786680;\n bh=LeCfULzXVq8eMeXoD4HoazACVFGuCL5m06fQgObX99k=;\n h=From:To:Subject:Date:Message-ID:MIME-Version:x-icloud-hme;\n b=c9DD0jM92oWOAp9lzgLePizgiiUQT6JBr0AlUCXUecpbKn0YPXnL9bPZgmcxMKkEtD6G9ff4Sn4BbVWrHM8B24HybW533VdMin0R281hXDPrk46OIbuCVSWZZEy82kUFjDilc7Pb8SoEs2npVR8czLn0tCcLKlwXzEcV+AZdKijwAcXck4FYmIK4giy/59YNkCACPgZhDN729MJKF09+9CyNlJVDvi4JQIwOh4mEYkS/KDoJmIUozJ8t5u5auXUIsuHxWzS1qvOOWoiiFEp2n6ebVSm38Vcn/9nDTCpfELDZoMZcptePe0GeMyLfvd/DaGoSAE8+RlJ5YJs8yahseg==", "mail-alias-created-date": "1752046281608", "From": "Mohamed Mediouni <mohamed@unpredictable.fr>", "To": "qemu-devel@nongnu.org", "Cc": "Wei Liu <wei.liu@kernel.org>, Paolo Bonzini <pbonzini@redhat.com>,\n Zhao Liu <zhao1.liu@intel.com>, Pedro Barbuda <pbarbuda@microsoft.com>,\n Phil Dennis-Jordan <phil@philjordan.eu>,\n Mohamed Mediouni <mohamed@unpredictable.fr>,\n Roman Bolshakov <rbolshakov@ddn.com>", "Subject": "[PATCH v4 4/7] whpx: i386: disable TbFlushHypercalls for emulated\n LAPIC", "Date": "Fri, 3 Apr 2026 07:37:45 +0200", "Message-ID": "<20260403053748.78831-5-mohamed@unpredictable.fr>", "X-Mailer": "git-send-email 2.50.1", "In-Reply-To": "<20260403053748.78831-1-mohamed@unpredictable.fr>", "References": "<20260403053748.78831-1-mohamed@unpredictable.fr>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-Proofpoint-ORIG-GUID": "3l6habb5X4joWJnYWIsEMrlzgw6NFJYN", "X-Authority-Info-Out": "v=2.4 cv=etDSD4pX c=1 sm=1 tr=0 ts=69cf5236\n cx=c_apl:c_pps:t_out a=bsP7O+dXZ5uKcj+dsLqiMw==:117\n a=bsP7O+dXZ5uKcj+dsLqiMw==:17 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22\n a=Rm0zj2O9plGGl-KjdfMA:9", "X-Proofpoint-Spam-Details-Enc": "AW1haW4tMjYwNDAzMDA0NyBTYWx0ZWRfXzCPzK3IdGZ8F\n +a8I4+c/5gGfDOrxlwFBNrkLp5YdASB2cS5Ta5pLyyJLk15HYr0clWBjTTg9tNxYJHqYSmLRCBH\n uSwSbNq91uV68j+OXG1zfeZi1Caw0dVyEo6Lh8IZCmlwctGdjwehyvcEO6qKoEfsrjN36Zl6ZMB\n /Ltad7kGd8X5rvCSqpe8oS5YUWA5NIeidVoqdulCG/I/h13vF7wnTBw64GPwnZCw5HRq4ZFSQ0S\n gl5AHNayXhvmDXv+4x6+ASAU38z22v79S03wKi1ztGA3AeJuq55q0rYEIaTyIYq07ArbTnCObpe\n qsJDZWqUKvW9TK59Gb5UzwZceX808rvwKmnzttKIcCILem3mJtZsX6xalxkaxM=", "X-Proofpoint-GUID": "3l6habb5X4joWJnYWIsEMrlzgw6NFJYN", "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=2026-04-03_01,2026-04-02_05,2025-10-01_01", "X-Proofpoint-Spam-Details": "rule=notspam policy=default score=0 adultscore=0\n mlxlogscore=709 suspectscore=0 clxscore=1030 phishscore=0 mlxscore=0\n lowpriorityscore=0 spamscore=0 malwarescore=0 bulkscore=0 classifier=spam\n authscore=0 adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000\n definitions=main-2604030047", "Received-SPF": "pass client-ip=57.103.87.103;\n envelope-from=mohamed@unpredictable.fr; helo=outbound.qs.icloud.com", "X-Spam_score_int": "-27", "X-Spam_score": "-2.8", "X-Spam_bar": "--", "X-Spam_report": "(-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001,\n RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001,\n RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001,\n SPF_HELO_PASS=-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": "AccessHypercallRegs was present twice so clean that up.\n\nRemove TbFlushHypercalls (and its extended Gva range sub-feature)\nfrom the user-mode LAPIC case as it behaves oddly there.\n\nSigned-off-by: Mohamed Mediouni <mohamed@unpredictable.fr>\n---\n target/i386/whpx/whpx-all.c | 9 ++++++---\n 1 file changed, 6 insertions(+), 3 deletions(-)", "diff": "diff --git a/target/i386/whpx/whpx-all.c b/target/i386/whpx/whpx-all.c\nindex 2d527b90dd..0908dfd134 100644\n--- a/target/i386/whpx/whpx-all.c\n+++ b/target/i386/whpx/whpx-all.c\n@@ -2489,10 +2489,7 @@ int whpx_accel_init(AccelState *as, MachineState *ms)\n synthetic_features.Bank0.AccessPartitionReferenceTsc = 1;\n synthetic_features.Bank0.AccessHypercallRegs = 1;\n synthetic_features.Bank0.AccessFrequencyRegs = 1;\n- synthetic_features.Bank0.EnableExtendedGvaRangesForFlushVirtualAddressList = 1;\n synthetic_features.Bank0.AccessVpIndex = 1;\n- synthetic_features.Bank0.AccessHypercallRegs = 1;\n- synthetic_features.Bank0.TbFlushHypercalls = 1;\n \n if (whpx_irqchip_in_kernel()) {\n synthetic_features.Bank0.AccessSynicRegs = 1;\n@@ -2500,6 +2497,12 @@ int whpx_accel_init(AccelState *as, MachineState *ms)\n synthetic_features.Bank0.AccessIntrCtrlRegs = 1;\n synthetic_features.Bank0.SyntheticClusterIpi = 1;\n synthetic_features.Bank0.DirectSyntheticTimers = 1;\n+ /*\n+ * These technically work without the Hyper-V LAPIC\n+ * but behave oddly for multi-core VMs.\n+ */\n+ synthetic_features.Bank0.TbFlushHypercalls = 1;\n+ synthetic_features.Bank0.EnableExtendedGvaRangesForFlushVirtualAddressList = 1;\n }\n \n if (is_modern_os && whpx->hyperv_enlightenments_allowed) {\n", "prefixes": [ "v4", "4/7" ] }